| 1 | /* $NetBSD: eval.c,v 1.84 2005/06/23 23:05:29 christos Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | */
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| 34 |
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| 35 | #ifdef HAVE_SYS_CDEFS_H
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| 36 | #include <sys/cdefs.h>
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| 37 | #endif
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| 38 | #ifndef lint
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| 39 | #if 0
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| 40 | static char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95";
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| 41 | #else
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| 42 | __RCSID("$NetBSD: eval.c,v 1.84 2005/06/23 23:05:29 christos Exp $");
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| 43 | #endif
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| 44 | #endif /* not lint */
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| 45 |
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| 46 | #include <stdlib.h>
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| 47 | #include <signal.h>
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| 48 | #include <stdio.h>
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| 49 | #include <unistd.h>
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| 50 | #include <sys/fcntl.h>
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| 51 | #include <sys/times.h>
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| 52 | #include <sys/param.h>
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| 53 | #include <sys/types.h>
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| 54 | #include <sys/wait.h>
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| 55 | #ifdef HAVE_SYSCTL_H
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| 56 | #include <sys/sysctl.h>
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| 57 | #endif
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| 58 | #ifdef __sun__
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| 59 | #include <iso/limits_iso.h>
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| 60 | #endif
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| 61 |
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| 62 | /*
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| 63 | * Evaluate a command.
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| 64 | */
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| 65 |
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| 66 | #include "shell.h"
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| 67 | #include "nodes.h"
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| 68 | #include "syntax.h"
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| 69 | #include "expand.h"
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| 70 | #include "parser.h"
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| 71 | #include "jobs.h"
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| 72 | #include "eval.h"
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| 73 | #include "builtins.h"
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| 74 | #include "options.h"
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| 75 | #include "exec.h"
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| 76 | #include "redir.h"
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| 77 | #include "input.h"
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| 78 | #include "output.h"
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| 79 | #include "trap.h"
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| 80 | #include "var.h"
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| 81 | #include "memalloc.h"
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| 82 | #include "error.h"
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| 83 | #include "show.h"
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| 84 | #include "mystring.h"
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| 85 | #include "main.h"
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| 86 | #ifndef SMALL
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| 87 | #include "myhistedit.h"
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| 88 | #endif
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| 89 |
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| 90 |
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| 91 | /* flags in argument to evaltree */
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| 92 | #define EV_EXIT 01 /* exit after evaluating tree */
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| 93 | #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
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| 94 | #define EV_BACKCMD 04 /* command executing within back quotes */
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| 95 |
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| 96 | int evalskip; /* set if we are skipping commands */
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| 97 | STATIC int skipcount; /* number of levels to skip */
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| 98 | MKINIT int loopnest; /* current loop nesting level */
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| 99 | int funcnest; /* depth of function calls */
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| 100 |
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| 101 |
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| 102 | char *commandname;
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| 103 | struct strlist *cmdenviron;
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| 104 | int exitstatus; /* exit status of last command */
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| 105 | int back_exitstatus; /* exit status of backquoted command */
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| 106 |
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| 107 |
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| 108 | STATIC void evalloop(union node *, int);
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| 109 | STATIC void evalfor(union node *, int);
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| 110 | STATIC void evalcase(union node *, int);
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| 111 | STATIC void evalsubshell(union node *, int);
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| 112 | STATIC void expredir(union node *);
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| 113 | STATIC void evalpipe(union node *);
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| 114 | STATIC void evalcommand(union node *, int, struct backcmd *);
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| 115 | STATIC void prehash(union node *);
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| 116 |
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| 117 |
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| 118 | /*
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| 119 | * Called to reset things after an exception.
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| 120 | */
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| 121 |
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| 122 | #ifdef mkinit
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| 123 | INCLUDE "eval.h"
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| 124 |
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| 125 | RESET {
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| 126 | evalskip = 0;
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| 127 | loopnest = 0;
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| 128 | funcnest = 0;
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| 129 | }
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| 130 |
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| 131 | SHELLPROC {
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| 132 | exitstatus = 0;
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| 133 | }
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| 134 | #endif
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| 135 |
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| 136 | static int
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| 137 | sh_pipe(int fds[2])
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| 138 | {
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| 139 | int nfd;
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| 140 |
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| 141 | if (pipe(fds))
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| 142 | return -1;
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| 143 |
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| 144 | if (fds[0] < 3) {
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| 145 | nfd = fcntl(fds[0], F_DUPFD, 3);
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| 146 | if (nfd != -1) {
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| 147 | close(fds[0]);
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| 148 | fds[0] = nfd;
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| 149 | }
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| 150 | }
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| 151 |
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| 152 | if (fds[1] < 3) {
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| 153 | nfd = fcntl(fds[1], F_DUPFD, 3);
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| 154 | if (nfd != -1) {
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| 155 | close(fds[1]);
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| 156 | fds[1] = nfd;
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| 157 | }
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| 158 | }
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| 159 | return 0;
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| 160 | }
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| 161 |
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| 162 |
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| 163 | /*
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| 164 | * The eval commmand.
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| 165 | */
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| 166 |
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| 167 | int
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| 168 | evalcmd(int argc, char **argv)
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| 169 | {
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| 170 | char *p;
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| 171 | char *concat;
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| 172 | char **ap;
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| 173 |
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| 174 | if (argc > 1) {
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| 175 | p = argv[1];
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| 176 | if (argc > 2) {
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| 177 | STARTSTACKSTR(concat);
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| 178 | ap = argv + 2;
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| 179 | for (;;) {
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| 180 | while (*p)
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| 181 | STPUTC(*p++, concat);
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| 182 | if ((p = *ap++) == NULL)
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| 183 | break;
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| 184 | STPUTC(' ', concat);
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| 185 | }
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| 186 | STPUTC('\0', concat);
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| 187 | p = grabstackstr(concat);
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| 188 | }
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| 189 | evalstring(p, EV_TESTED);
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| 190 | }
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| 191 | return exitstatus;
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| 192 | }
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| 193 |
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| 194 |
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| 195 | /*
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| 196 | * Execute a command or commands contained in a string.
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| 197 | */
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| 198 |
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| 199 | void
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| 200 | evalstring(char *s, int flag)
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| 201 | {
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| 202 | union node *n;
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| 203 | struct stackmark smark;
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| 204 |
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| 205 | setstackmark(&smark);
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| 206 | setinputstring(s, 1);
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| 207 |
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| 208 | while ((n = parsecmd(0)) != NEOF) {
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| 209 | evaltree(n, flag);
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| 210 | popstackmark(&smark);
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| 211 | }
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| 212 | popfile();
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| 213 | popstackmark(&smark);
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| 214 | }
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| 215 |
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| 216 |
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| 217 |
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| 218 | /*
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| 219 | * Evaluate a parse tree. The value is left in the global variable
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| 220 | * exitstatus.
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| 221 | */
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| 222 |
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| 223 | void
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| 224 | evaltree(union node *n, int flags)
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| 225 | {
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| 226 | if (n == NULL) {
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| 227 | TRACE(("evaltree(NULL) called\n"));
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| 228 | exitstatus = 0;
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| 229 | goto out;
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| 230 | }
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| 231 | #ifndef SMALL
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| 232 | displayhist = 1; /* show history substitutions done with fc */
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| 233 | #endif
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| 234 | TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
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| 235 | getpid(), n, n->type, flags));
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| 236 | switch (n->type) {
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| 237 | case NSEMI:
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| 238 | evaltree(n->nbinary.ch1, flags & EV_TESTED);
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| 239 | if (evalskip)
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| 240 | goto out;
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| 241 | evaltree(n->nbinary.ch2, flags);
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| 242 | break;
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| 243 | case NAND:
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| 244 | evaltree(n->nbinary.ch1, EV_TESTED);
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| 245 | if (evalskip || exitstatus != 0)
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| 246 | goto out;
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| 247 | evaltree(n->nbinary.ch2, flags);
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| 248 | break;
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| 249 | case NOR:
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| 250 | evaltree(n->nbinary.ch1, EV_TESTED);
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| 251 | if (evalskip || exitstatus == 0)
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| 252 | goto out;
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| 253 | evaltree(n->nbinary.ch2, flags);
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| 254 | break;
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| 255 | case NREDIR:
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| 256 | expredir(n->nredir.redirect);
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| 257 | redirect(n->nredir.redirect, REDIR_PUSH);
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| 258 | evaltree(n->nredir.n, flags);
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| 259 | popredir();
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| 260 | break;
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| 261 | case NSUBSHELL:
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| 262 | evalsubshell(n, flags);
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| 263 | break;
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| 264 | case NBACKGND:
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| 265 | evalsubshell(n, flags);
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| 266 | break;
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| 267 | case NIF: {
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| 268 | evaltree(n->nif.test, EV_TESTED);
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| 269 | if (evalskip)
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| 270 | goto out;
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| 271 | if (exitstatus == 0)
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| 272 | evaltree(n->nif.ifpart, flags);
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| 273 | else if (n->nif.elsepart)
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| 274 | evaltree(n->nif.elsepart, flags);
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| 275 | else
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| 276 | exitstatus = 0;
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| 277 | break;
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| 278 | }
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| 279 | case NWHILE:
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| 280 | case NUNTIL:
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| 281 | evalloop(n, flags);
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| 282 | break;
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| 283 | case NFOR:
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| 284 | evalfor(n, flags);
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| 285 | break;
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| 286 | case NCASE:
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| 287 | evalcase(n, flags);
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| 288 | break;
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| 289 | case NDEFUN:
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| 290 | defun(n->narg.text, n->narg.next);
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| 291 | exitstatus = 0;
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| 292 | break;
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| 293 | case NNOT:
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| 294 | evaltree(n->nnot.com, EV_TESTED);
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| 295 | exitstatus = !exitstatus;
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| 296 | break;
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| 297 | case NPIPE:
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| 298 | evalpipe(n);
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| 299 | break;
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| 300 | case NCMD:
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| 301 | evalcommand(n, flags, (struct backcmd *)NULL);
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| 302 | break;
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| 303 | default:
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| 304 | out1fmt("Node type = %d\n", n->type);
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| 305 | flushout(&output);
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| 306 | break;
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| 307 | }
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| 308 | out:
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| 309 | if (pendingsigs)
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| 310 | dotrap();
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| 311 | if ((flags & EV_EXIT) != 0)
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| 312 | exitshell(exitstatus);
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| 313 | }
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| 314 |
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| 315 |
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| 316 | STATIC void
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| 317 | evalloop(union node *n, int flags)
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| 318 | {
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| 319 | int status;
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| 320 |
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| 321 | loopnest++;
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| 322 | status = 0;
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| 323 | for (;;) {
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| 324 | evaltree(n->nbinary.ch1, EV_TESTED);
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| 325 | if (evalskip) {
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| 326 | skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
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| 327 | evalskip = 0;
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| 328 | continue;
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| 329 | }
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| 330 | if (evalskip == SKIPBREAK && --skipcount <= 0)
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| 331 | evalskip = 0;
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| 332 | break;
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| 333 | }
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| 334 | if (n->type == NWHILE) {
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| 335 | if (exitstatus != 0)
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| 336 | break;
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| 337 | } else {
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| 338 | if (exitstatus == 0)
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| 339 | break;
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| 340 | }
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| 341 | evaltree(n->nbinary.ch2, flags & EV_TESTED);
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| 342 | status = exitstatus;
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| 343 | if (evalskip)
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| 344 | goto skipping;
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| 345 | }
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| 346 | loopnest--;
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| 347 | exitstatus = status;
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| 348 | }
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| 349 |
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| 350 |
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| 351 |
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| 352 | STATIC void
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| 353 | evalfor(union node *n, int flags)
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| 354 | {
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| 355 | struct arglist arglist;
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| 356 | union node *argp;
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| 357 | struct strlist *sp;
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| 358 | struct stackmark smark;
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| 359 | int status = 0;
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| 360 |
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| 361 | setstackmark(&smark);
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| 362 | arglist.lastp = &arglist.list;
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| 363 | for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
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| 364 | expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
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| 365 | if (evalskip)
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| 366 | goto out;
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| 367 | }
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| 368 | *arglist.lastp = NULL;
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| 369 |
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| 370 | loopnest++;
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| 371 | for (sp = arglist.list ; sp ; sp = sp->next) {
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| 372 | setvar(n->nfor.var, sp->text, 0);
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| 373 | evaltree(n->nfor.body, flags & EV_TESTED);
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| 374 | status = exitstatus;
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| 375 | if (evalskip) {
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| 376 | if (evalskip == SKIPCONT && --skipcount <= 0) {
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| 377 | evalskip = 0;
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| 378 | continue;
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| 379 | }
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| 380 | if (evalskip == SKIPBREAK && --skipcount <= 0)
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| 381 | evalskip = 0;
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| 382 | break;
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| 383 | }
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| 384 | }
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| 385 | loopnest--;
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| 386 | exitstatus = status;
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| 387 | out:
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| 388 | popstackmark(&smark);
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| 389 | }
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| 390 |
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| 391 |
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| 392 |
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| 393 | STATIC void
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| 394 | evalcase(union node *n, int flags)
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| 395 | {
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| 396 | union node *cp;
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| 397 | union node *patp;
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| 398 | struct arglist arglist;
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| 399 | struct stackmark smark;
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| 400 | int status = 0;
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| 401 |
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| 402 | setstackmark(&smark);
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| 403 | arglist.lastp = &arglist.list;
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| 404 | expandarg(n->ncase.expr, &arglist, EXP_TILDE);
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| 405 | for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
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| 406 | for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
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| 407 | if (casematch(patp, arglist.list->text)) {
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| 408 | if (evalskip == 0) {
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| 409 | evaltree(cp->nclist.body, flags);
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| 410 | status = exitstatus;
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| 411 | }
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| 412 | goto out;
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| 413 | }
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| 414 | }
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| 415 | }
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| 416 | out:
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| 417 | exitstatus = status;
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| 418 | popstackmark(&smark);
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| 419 | }
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| 420 |
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| 421 |
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| 422 |
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| 423 | /*
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| 424 | * Kick off a subshell to evaluate a tree.
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| 425 | */
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| 426 |
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| 427 | STATIC void
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| 428 | evalsubshell(union node *n, int flags)
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| 429 | {
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| 430 | struct job *jp;
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| 431 | int backgnd = (n->type == NBACKGND);
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| 432 |
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| 433 | expredir(n->nredir.redirect);
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| 434 | INTOFF;
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| 435 | jp = makejob(n, 1);
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| 436 | if (forkshell(jp, n, backgnd ? FORK_BG : FORK_FG) == 0) {
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| 437 | INTON;
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| 438 | if (backgnd)
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| 439 | flags &=~ EV_TESTED;
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| 440 | redirect(n->nredir.redirect, 0);
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| 441 | /* never returns */
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| 442 | evaltree(n->nredir.n, flags | EV_EXIT);
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| 443 | }
|
|---|
| 444 | if (! backgnd)
|
|---|
| 445 | exitstatus = waitforjob(jp);
|
|---|
| 446 | INTON;
|
|---|
| 447 | }
|
|---|
| 448 |
|
|---|
| 449 |
|
|---|
| 450 |
|
|---|
| 451 | /*
|
|---|
| 452 | * Compute the names of the files in a redirection list.
|
|---|
| 453 | */
|
|---|
| 454 |
|
|---|
| 455 | STATIC void
|
|---|
| 456 | expredir(union node *n)
|
|---|
| 457 | {
|
|---|
| 458 | union node *redir;
|
|---|
| 459 |
|
|---|
| 460 | for (redir = n ; redir ; redir = redir->nfile.next) {
|
|---|
| 461 | struct arglist fn;
|
|---|
| 462 | fn.lastp = &fn.list;
|
|---|
| 463 | switch (redir->type) {
|
|---|
| 464 | case NFROMTO:
|
|---|
| 465 | case NFROM:
|
|---|
| 466 | case NTO:
|
|---|
| 467 | case NCLOBBER:
|
|---|
| 468 | case NAPPEND:
|
|---|
| 469 | expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
|
|---|
| 470 | redir->nfile.expfname = fn.list->text;
|
|---|
| 471 | break;
|
|---|
| 472 | case NFROMFD:
|
|---|
| 473 | case NTOFD:
|
|---|
| 474 | if (redir->ndup.vname) {
|
|---|
| 475 | expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
|
|---|
| 476 | fixredir(redir, fn.list->text, 1);
|
|---|
| 477 | }
|
|---|
| 478 | break;
|
|---|
| 479 | }
|
|---|
| 480 | }
|
|---|
| 481 | }
|
|---|
| 482 |
|
|---|
| 483 |
|
|---|
| 484 |
|
|---|
| 485 | /*
|
|---|
| 486 | * Evaluate a pipeline. All the processes in the pipeline are children
|
|---|
| 487 | * of the process creating the pipeline. (This differs from some versions
|
|---|
| 488 | * of the shell, which make the last process in a pipeline the parent
|
|---|
| 489 | * of all the rest.)
|
|---|
| 490 | */
|
|---|
| 491 |
|
|---|
| 492 | STATIC void
|
|---|
| 493 | evalpipe(union node *n)
|
|---|
| 494 | {
|
|---|
| 495 | struct job *jp;
|
|---|
| 496 | struct nodelist *lp;
|
|---|
| 497 | int pipelen;
|
|---|
| 498 | int prevfd;
|
|---|
| 499 | int pip[2];
|
|---|
| 500 |
|
|---|
| 501 | TRACE(("evalpipe(0x%lx) called\n", (long)n));
|
|---|
| 502 | pipelen = 0;
|
|---|
| 503 | for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
|
|---|
| 504 | pipelen++;
|
|---|
| 505 | INTOFF;
|
|---|
| 506 | jp = makejob(n, pipelen);
|
|---|
| 507 | prevfd = -1;
|
|---|
| 508 | for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|---|
| 509 | prehash(lp->n);
|
|---|
| 510 | pip[1] = -1;
|
|---|
| 511 | if (lp->next) {
|
|---|
| 512 | if (sh_pipe(pip) < 0) {
|
|---|
| 513 | close(prevfd);
|
|---|
| 514 | error("Pipe call failed");
|
|---|
| 515 | }
|
|---|
| 516 | }
|
|---|
| 517 | if (forkshell(jp, lp->n, n->npipe.backgnd ? FORK_BG : FORK_FG) == 0) {
|
|---|
| 518 | INTON;
|
|---|
| 519 | if (prevfd > 0) {
|
|---|
| 520 | close(0);
|
|---|
| 521 | copyfd(prevfd, 0);
|
|---|
| 522 | close(prevfd);
|
|---|
| 523 | }
|
|---|
| 524 | if (pip[1] >= 0) {
|
|---|
| 525 | close(pip[0]);
|
|---|
| 526 | if (pip[1] != 1) {
|
|---|
| 527 | close(1);
|
|---|
| 528 | copyfd(pip[1], 1);
|
|---|
| 529 | close(pip[1]);
|
|---|
| 530 | }
|
|---|
| 531 | }
|
|---|
| 532 | evaltree(lp->n, EV_EXIT);
|
|---|
| 533 | }
|
|---|
| 534 | if (prevfd >= 0)
|
|---|
| 535 | close(prevfd);
|
|---|
| 536 | prevfd = pip[0];
|
|---|
| 537 | close(pip[1]);
|
|---|
| 538 | }
|
|---|
| 539 | if (n->npipe.backgnd == 0) {
|
|---|
| 540 | exitstatus = waitforjob(jp);
|
|---|
| 541 | TRACE(("evalpipe: job done exit status %d\n", exitstatus));
|
|---|
| 542 | }
|
|---|
| 543 | INTON;
|
|---|
| 544 | }
|
|---|
| 545 |
|
|---|
| 546 |
|
|---|
| 547 |
|
|---|
| 548 | /*
|
|---|
| 549 | * Execute a command inside back quotes. If it's a builtin command, we
|
|---|
| 550 | * want to save its output in a block obtained from malloc. Otherwise
|
|---|
| 551 | * we fork off a subprocess and get the output of the command via a pipe.
|
|---|
| 552 | * Should be called with interrupts off.
|
|---|
| 553 | */
|
|---|
| 554 |
|
|---|
| 555 | void
|
|---|
| 556 | evalbackcmd(union node *n, struct backcmd *result)
|
|---|
| 557 | {
|
|---|
| 558 | int pip[2];
|
|---|
| 559 | struct job *jp;
|
|---|
| 560 | struct stackmark smark; /* unnecessary */
|
|---|
| 561 |
|
|---|
| 562 | setstackmark(&smark);
|
|---|
| 563 | result->fd = -1;
|
|---|
| 564 | result->buf = NULL;
|
|---|
| 565 | result->nleft = 0;
|
|---|
| 566 | result->jp = NULL;
|
|---|
| 567 | if (n == NULL) {
|
|---|
| 568 | goto out;
|
|---|
| 569 | }
|
|---|
| 570 | #ifdef notyet
|
|---|
| 571 | /*
|
|---|
| 572 | * For now we disable executing builtins in the same
|
|---|
| 573 | * context as the shell, because we are not keeping
|
|---|
| 574 | * enough state to recover from changes that are
|
|---|
| 575 | * supposed only to affect subshells. eg. echo "`cd /`"
|
|---|
| 576 | */
|
|---|
| 577 | if (n->type == NCMD) {
|
|---|
| 578 | exitstatus = oexitstatus;
|
|---|
| 579 | evalcommand(n, EV_BACKCMD, result);
|
|---|
| 580 | } else
|
|---|
| 581 | #endif
|
|---|
| 582 | {
|
|---|
| 583 | INTOFF;
|
|---|
| 584 | if (sh_pipe(pip) < 0)
|
|---|
| 585 | error("Pipe call failed");
|
|---|
| 586 | jp = makejob(n, 1);
|
|---|
| 587 | if (forkshell(jp, n, FORK_NOJOB) == 0) {
|
|---|
| 588 | FORCEINTON;
|
|---|
| 589 | close(pip[0]);
|
|---|
| 590 | if (pip[1] != 1) {
|
|---|
| 591 | close(1);
|
|---|
| 592 | copyfd(pip[1], 1);
|
|---|
| 593 | close(pip[1]);
|
|---|
| 594 | }
|
|---|
| 595 | eflag = 0;
|
|---|
| 596 | evaltree(n, EV_EXIT);
|
|---|
| 597 | /* NOTREACHED */
|
|---|
| 598 | }
|
|---|
| 599 | close(pip[1]);
|
|---|
| 600 | result->fd = pip[0];
|
|---|
| 601 | result->jp = jp;
|
|---|
| 602 | INTON;
|
|---|
| 603 | }
|
|---|
| 604 | out:
|
|---|
| 605 | popstackmark(&smark);
|
|---|
| 606 | TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
|
|---|
| 607 | result->fd, result->buf, result->nleft, result->jp));
|
|---|
| 608 | }
|
|---|
| 609 |
|
|---|
| 610 | static const char *
|
|---|
| 611 | syspath(void)
|
|---|
| 612 | {
|
|---|
| 613 | #ifdef CTL_USER
|
|---|
| 614 | static char *sys_path = NULL;
|
|---|
| 615 | static int mib[] = {CTL_USER, USER_CS_PATH};
|
|---|
| 616 | #endif
|
|---|
| 617 | #ifdef PC_PATH_SEP
|
|---|
| 618 | static char def_path[] = "PATH=/usr/bin;/bin;/usr/sbin;/sbin";
|
|---|
| 619 | #else
|
|---|
| 620 | static char def_path[] = "PATH=/usr/bin:/bin:/usr/sbin:/sbin";
|
|---|
| 621 | #endif
|
|---|
| 622 | #ifdef CTL_USER
|
|---|
| 623 | size_t len;
|
|---|
| 624 |
|
|---|
| 625 | if (sys_path == NULL) {
|
|---|
| 626 | if (sysctl(mib, 2, 0, &len, 0, 0) != -1 &&
|
|---|
| 627 | (sys_path = ckmalloc(len + 5)) != NULL &&
|
|---|
| 628 | sysctl(mib, 2, sys_path + 5, &len, 0, 0) != -1) {
|
|---|
| 629 | memcpy(sys_path, "PATH=", 5);
|
|---|
| 630 | } else {
|
|---|
| 631 | ckfree(sys_path);
|
|---|
| 632 | /* something to keep things happy */
|
|---|
| 633 | sys_path = def_path;
|
|---|
| 634 | }
|
|---|
| 635 | }
|
|---|
| 636 | return sys_path;
|
|---|
| 637 | #else
|
|---|
| 638 | return def_path;
|
|---|
| 639 | #endif
|
|---|
| 640 | }
|
|---|
| 641 |
|
|---|
| 642 | static int
|
|---|
| 643 | parse_command_args(int argc, char **argv, int *use_syspath)
|
|---|
| 644 | {
|
|---|
| 645 | int sv_argc = argc;
|
|---|
| 646 | char *cp, c;
|
|---|
| 647 |
|
|---|
| 648 | *use_syspath = 0;
|
|---|
| 649 |
|
|---|
| 650 | for (;;) {
|
|---|
| 651 | argv++;
|
|---|
| 652 | if (--argc == 0)
|
|---|
| 653 | break;
|
|---|
| 654 | cp = *argv;
|
|---|
| 655 | if (*cp++ != '-')
|
|---|
| 656 | break;
|
|---|
| 657 | if (*cp == '-' && cp[1] == 0) {
|
|---|
| 658 | argv++;
|
|---|
| 659 | argc--;
|
|---|
| 660 | break;
|
|---|
| 661 | }
|
|---|
| 662 | while ((c = *cp++)) {
|
|---|
| 663 | switch (c) {
|
|---|
| 664 | case 'p':
|
|---|
| 665 | *use_syspath = 1;
|
|---|
| 666 | break;
|
|---|
| 667 | default:
|
|---|
| 668 | /* run 'typecmd' for other options */
|
|---|
| 669 | return 0;
|
|---|
| 670 | }
|
|---|
| 671 | }
|
|---|
| 672 | }
|
|---|
| 673 | return sv_argc - argc;
|
|---|
| 674 | }
|
|---|
| 675 |
|
|---|
| 676 | int vforked = 0;
|
|---|
| 677 |
|
|---|
| 678 | /*
|
|---|
| 679 | * Execute a simple command.
|
|---|
| 680 | */
|
|---|
| 681 |
|
|---|
| 682 | STATIC void
|
|---|
| 683 | evalcommand(union node *cmd, int flags, struct backcmd *backcmd)
|
|---|
| 684 | {
|
|---|
| 685 | struct stackmark smark;
|
|---|
| 686 | union node *argp;
|
|---|
| 687 | struct arglist arglist;
|
|---|
| 688 | struct arglist varlist;
|
|---|
| 689 | char **argv;
|
|---|
| 690 | int argc;
|
|---|
| 691 | char **envp;
|
|---|
| 692 | int varflag;
|
|---|
| 693 | struct strlist *sp;
|
|---|
| 694 | int mode;
|
|---|
| 695 | int pip[2];
|
|---|
| 696 | struct cmdentry cmdentry;
|
|---|
| 697 | struct job *jp;
|
|---|
| 698 | struct jmploc jmploc;
|
|---|
| 699 | struct jmploc *volatile savehandler;
|
|---|
| 700 | char *volatile savecmdname;
|
|---|
| 701 | volatile struct shparam saveparam;
|
|---|
| 702 | struct localvar *volatile savelocalvars;
|
|---|
| 703 | volatile int e;
|
|---|
| 704 | char *lastarg;
|
|---|
| 705 | const char *path = pathval();
|
|---|
| 706 | volatile int temp_path;
|
|---|
| 707 | #if __GNUC__
|
|---|
| 708 | /* Avoid longjmp clobbering */
|
|---|
| 709 | (void) &argv;
|
|---|
| 710 | (void) &argc;
|
|---|
| 711 | (void) &lastarg;
|
|---|
| 712 | (void) &flags;
|
|---|
| 713 | #endif
|
|---|
| 714 |
|
|---|
| 715 | vforked = 0;
|
|---|
| 716 | /* First expand the arguments. */
|
|---|
| 717 | TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
|
|---|
| 718 | setstackmark(&smark);
|
|---|
| 719 | back_exitstatus = 0;
|
|---|
| 720 |
|
|---|
| 721 | arglist.lastp = &arglist.list;
|
|---|
| 722 | varflag = 1;
|
|---|
| 723 | /* Expand arguments, ignoring the initial 'name=value' ones */
|
|---|
| 724 | for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
|
|---|
| 725 | char *p = argp->narg.text;
|
|---|
| 726 | if (varflag && is_name(*p)) {
|
|---|
| 727 | do {
|
|---|
| 728 | p++;
|
|---|
| 729 | } while (is_in_name(*p));
|
|---|
| 730 | if (*p == '=')
|
|---|
| 731 | continue;
|
|---|
| 732 | }
|
|---|
| 733 | expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
|
|---|
| 734 | varflag = 0;
|
|---|
| 735 | }
|
|---|
| 736 | *arglist.lastp = NULL;
|
|---|
| 737 |
|
|---|
| 738 | expredir(cmd->ncmd.redirect);
|
|---|
| 739 |
|
|---|
| 740 | /* Now do the initial 'name=value' ones we skipped above */
|
|---|
| 741 | varlist.lastp = &varlist.list;
|
|---|
| 742 | for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
|
|---|
| 743 | char *p = argp->narg.text;
|
|---|
| 744 | if (!is_name(*p))
|
|---|
| 745 | break;
|
|---|
| 746 | do
|
|---|
| 747 | p++;
|
|---|
| 748 | while (is_in_name(*p));
|
|---|
| 749 | if (*p != '=')
|
|---|
| 750 | break;
|
|---|
| 751 | expandarg(argp, &varlist, EXP_VARTILDE);
|
|---|
| 752 | }
|
|---|
| 753 | *varlist.lastp = NULL;
|
|---|
| 754 |
|
|---|
| 755 | argc = 0;
|
|---|
| 756 | for (sp = arglist.list ; sp ; sp = sp->next)
|
|---|
| 757 | argc++;
|
|---|
| 758 | argv = stalloc(sizeof (char *) * (argc + 1));
|
|---|
| 759 |
|
|---|
| 760 | for (sp = arglist.list ; sp ; sp = sp->next) {
|
|---|
| 761 | TRACE(("evalcommand arg: %s\n", sp->text));
|
|---|
| 762 | *argv++ = sp->text;
|
|---|
| 763 | }
|
|---|
| 764 | *argv = NULL;
|
|---|
| 765 | lastarg = NULL;
|
|---|
| 766 | if (iflag && funcnest == 0 && argc > 0)
|
|---|
| 767 | lastarg = argv[-1];
|
|---|
| 768 | argv -= argc;
|
|---|
| 769 |
|
|---|
| 770 | /* Print the command if xflag is set. */
|
|---|
| 771 | if (xflag) {
|
|---|
| 772 | char sep = 0;
|
|---|
| 773 | out2str(ps4val());
|
|---|
| 774 | for (sp = varlist.list ; sp ; sp = sp->next) {
|
|---|
| 775 | if (sep != 0)
|
|---|
| 776 | outc(sep, &errout);
|
|---|
| 777 | out2str(sp->text);
|
|---|
| 778 | sep = ' ';
|
|---|
| 779 | }
|
|---|
| 780 | for (sp = arglist.list ; sp ; sp = sp->next) {
|
|---|
| 781 | if (sep != 0)
|
|---|
| 782 | outc(sep, &errout);
|
|---|
| 783 | out2str(sp->text);
|
|---|
| 784 | sep = ' ';
|
|---|
| 785 | }
|
|---|
| 786 | outc('\n', &errout);
|
|---|
| 787 | flushout(&errout);
|
|---|
| 788 | }
|
|---|
| 789 |
|
|---|
| 790 | /* Now locate the command. */
|
|---|
| 791 | if (argc == 0) {
|
|---|
| 792 | cmdentry.cmdtype = CMDSPLBLTIN;
|
|---|
| 793 | cmdentry.u.bltin = bltincmd;
|
|---|
| 794 | } else {
|
|---|
| 795 | static const char PATH[] = "PATH=";
|
|---|
| 796 | int cmd_flags = DO_ERR;
|
|---|
| 797 |
|
|---|
| 798 | /*
|
|---|
| 799 | * Modify the command lookup path, if a PATH= assignment
|
|---|
| 800 | * is present
|
|---|
| 801 | */
|
|---|
| 802 | for (sp = varlist.list; sp; sp = sp->next)
|
|---|
| 803 | if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0)
|
|---|
| 804 | path = sp->text + sizeof(PATH) - 1;
|
|---|
| 805 |
|
|---|
| 806 | do {
|
|---|
| 807 | int argsused, use_syspath;
|
|---|
| 808 | find_command(argv[0], &cmdentry, cmd_flags, path);
|
|---|
| 809 | if (cmdentry.cmdtype == CMDUNKNOWN) {
|
|---|
| 810 | exitstatus = 127;
|
|---|
| 811 | flushout(&errout);
|
|---|
| 812 | goto out;
|
|---|
| 813 | }
|
|---|
| 814 |
|
|---|
| 815 | /* implement the 'command' builtin here */
|
|---|
| 816 | if (cmdentry.cmdtype != CMDBUILTIN ||
|
|---|
| 817 | cmdentry.u.bltin != bltincmd)
|
|---|
| 818 | break;
|
|---|
| 819 | cmd_flags |= DO_NOFUNC;
|
|---|
| 820 | argsused = parse_command_args(argc, argv, &use_syspath);
|
|---|
| 821 | if (argsused == 0) {
|
|---|
| 822 | /* use 'type' builting to display info */
|
|---|
| 823 | cmdentry.u.bltin = typecmd;
|
|---|
| 824 | break;
|
|---|
| 825 | }
|
|---|
| 826 | argc -= argsused;
|
|---|
| 827 | argv += argsused;
|
|---|
| 828 | if (use_syspath)
|
|---|
| 829 | path = syspath() + 5;
|
|---|
| 830 | } while (argc != 0);
|
|---|
| 831 | if (cmdentry.cmdtype == CMDSPLBLTIN && cmd_flags & DO_NOFUNC)
|
|---|
| 832 | /* posix mandates that 'command <splbltin>' act as if
|
|---|
| 833 | <splbltin> was a normal builtin */
|
|---|
| 834 | cmdentry.cmdtype = CMDBUILTIN;
|
|---|
| 835 | }
|
|---|
| 836 |
|
|---|
| 837 | /* Fork off a child process if necessary. */
|
|---|
| 838 | if (cmd->ncmd.backgnd
|
|---|
| 839 | || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
|
|---|
| 840 | || ((flags & EV_BACKCMD) != 0
|
|---|
| 841 | && ((cmdentry.cmdtype != CMDBUILTIN && cmdentry.cmdtype != CMDSPLBLTIN)
|
|---|
| 842 | || cmdentry.u.bltin == dotcmd
|
|---|
| 843 | || cmdentry.u.bltin == evalcmd))) {
|
|---|
| 844 | INTOFF;
|
|---|
| 845 | jp = makejob(cmd, 1);
|
|---|
| 846 | mode = cmd->ncmd.backgnd;
|
|---|
| 847 | if (flags & EV_BACKCMD) {
|
|---|
| 848 | mode = FORK_NOJOB;
|
|---|
| 849 | if (sh_pipe(pip) < 0)
|
|---|
| 850 | error("Pipe call failed");
|
|---|
| 851 | }
|
|---|
| 852 | #ifdef DO_SHAREDVFORK
|
|---|
| 853 | /* It is essential that if DO_SHAREDVFORK is defined that the
|
|---|
| 854 | * child's address space is actually shared with the parent as
|
|---|
| 855 | * we rely on this.
|
|---|
| 856 | */
|
|---|
| 857 | if (cmdentry.cmdtype == CMDNORMAL) {
|
|---|
| 858 | pid_t pid;
|
|---|
| 859 |
|
|---|
| 860 | savelocalvars = localvars;
|
|---|
| 861 | localvars = NULL;
|
|---|
| 862 | vforked = 1;
|
|---|
| 863 | switch (pid = vfork()) {
|
|---|
| 864 | case -1:
|
|---|
| 865 | TRACE(("Vfork failed, errno=%d\n", errno));
|
|---|
| 866 | INTON;
|
|---|
| 867 | error("Cannot vfork");
|
|---|
| 868 | break;
|
|---|
| 869 | case 0:
|
|---|
| 870 | /* Make sure that exceptions only unwind to
|
|---|
| 871 | * after the vfork(2)
|
|---|
| 872 | */
|
|---|
| 873 | if (setjmp(jmploc.loc)) {
|
|---|
| 874 | if (exception == EXSHELLPROC) {
|
|---|
| 875 | /* We can't progress with the vfork,
|
|---|
| 876 | * so, set vforked = 2 so the parent
|
|---|
| 877 | * knows, and _exit();
|
|---|
| 878 | */
|
|---|
| 879 | vforked = 2;
|
|---|
| 880 | _exit(0);
|
|---|
| 881 | } else {
|
|---|
| 882 | _exit(exerrno);
|
|---|
| 883 | }
|
|---|
| 884 | }
|
|---|
| 885 | savehandler = handler;
|
|---|
| 886 | handler = &jmploc;
|
|---|
| 887 | listmklocal(varlist.list, VEXPORT | VNOFUNC);
|
|---|
| 888 | forkchild(jp, cmd, mode, vforked);
|
|---|
| 889 | break;
|
|---|
| 890 | default:
|
|---|
| 891 | handler = savehandler; /* restore from vfork(2) */
|
|---|
| 892 | poplocalvars();
|
|---|
| 893 | localvars = savelocalvars;
|
|---|
| 894 | if (vforked == 2) {
|
|---|
| 895 | vforked = 0;
|
|---|
| 896 |
|
|---|
| 897 | (void)waitpid(pid, NULL, 0);
|
|---|
| 898 | /* We need to progress in a normal fork fashion */
|
|---|
| 899 | goto normal_fork;
|
|---|
| 900 | }
|
|---|
| 901 | vforked = 0;
|
|---|
| 902 | forkparent(jp, cmd, mode, pid);
|
|---|
| 903 | goto parent;
|
|---|
| 904 | }
|
|---|
| 905 | } else {
|
|---|
| 906 | normal_fork:
|
|---|
| 907 | #endif
|
|---|
| 908 | if (forkshell(jp, cmd, mode) != 0)
|
|---|
| 909 | goto parent; /* at end of routine */
|
|---|
| 910 | FORCEINTON;
|
|---|
| 911 | #ifdef DO_SHAREDVFORK
|
|---|
| 912 | }
|
|---|
| 913 | #endif
|
|---|
| 914 | if (flags & EV_BACKCMD) {
|
|---|
| 915 | if (!vforked) {
|
|---|
| 916 | FORCEINTON;
|
|---|
| 917 | }
|
|---|
| 918 | close(pip[0]);
|
|---|
| 919 | if (pip[1] != 1) {
|
|---|
| 920 | close(1);
|
|---|
| 921 | copyfd(pip[1], 1);
|
|---|
| 922 | close(pip[1]);
|
|---|
| 923 | }
|
|---|
| 924 | }
|
|---|
| 925 | flags |= EV_EXIT;
|
|---|
| 926 | }
|
|---|
| 927 |
|
|---|
| 928 | /* This is the child process if a fork occurred. */
|
|---|
| 929 | /* Execute the command. */
|
|---|
| 930 | switch (cmdentry.cmdtype) {
|
|---|
| 931 | case CMDFUNCTION:
|
|---|
| 932 | #ifdef DEBUG
|
|---|
| 933 | trputs("Shell function: "); trargs(argv);
|
|---|
| 934 | #endif
|
|---|
| 935 | redirect(cmd->ncmd.redirect, REDIR_PUSH);
|
|---|
| 936 | saveparam = shellparam;
|
|---|
| 937 | shellparam.malloc = 0;
|
|---|
| 938 | shellparam.reset = 1;
|
|---|
| 939 | shellparam.nparam = argc - 1;
|
|---|
| 940 | shellparam.p = argv + 1;
|
|---|
| 941 | shellparam.optnext = NULL;
|
|---|
| 942 | INTOFF;
|
|---|
| 943 | savelocalvars = localvars;
|
|---|
| 944 | localvars = NULL;
|
|---|
| 945 | INTON;
|
|---|
| 946 | if (setjmp(jmploc.loc)) {
|
|---|
| 947 | if (exception == EXSHELLPROC) {
|
|---|
| 948 | freeparam((volatile struct shparam *)
|
|---|
| 949 | &saveparam);
|
|---|
| 950 | } else {
|
|---|
| 951 | freeparam(&shellparam);
|
|---|
| 952 | shellparam = saveparam;
|
|---|
| 953 | }
|
|---|
| 954 | poplocalvars();
|
|---|
| 955 | localvars = savelocalvars;
|
|---|
| 956 | handler = savehandler;
|
|---|
| 957 | longjmp(handler->loc, 1);
|
|---|
| 958 | }
|
|---|
| 959 | savehandler = handler;
|
|---|
| 960 | handler = &jmploc;
|
|---|
| 961 | listmklocal(varlist.list, 0);
|
|---|
| 962 | /* stop shell blowing its stack */
|
|---|
| 963 | if (++funcnest > 1000)
|
|---|
| 964 | error("too many nested function calls");
|
|---|
| 965 | evaltree(cmdentry.u.func, flags & EV_TESTED);
|
|---|
| 966 | funcnest--;
|
|---|
| 967 | INTOFF;
|
|---|
| 968 | poplocalvars();
|
|---|
| 969 | localvars = savelocalvars;
|
|---|
| 970 | freeparam(&shellparam);
|
|---|
| 971 | shellparam = saveparam;
|
|---|
| 972 | handler = savehandler;
|
|---|
| 973 | popredir();
|
|---|
| 974 | INTON;
|
|---|
| 975 | if (evalskip == SKIPFUNC) {
|
|---|
| 976 | evalskip = 0;
|
|---|
| 977 | skipcount = 0;
|
|---|
| 978 | }
|
|---|
| 979 | if (flags & EV_EXIT)
|
|---|
| 980 | exitshell(exitstatus);
|
|---|
| 981 | break;
|
|---|
| 982 |
|
|---|
| 983 | case CMDBUILTIN:
|
|---|
| 984 | case CMDSPLBLTIN:
|
|---|
| 985 | #ifdef DEBUG
|
|---|
| 986 | trputs("builtin command: "); trargs(argv);
|
|---|
| 987 | #endif
|
|---|
| 988 | mode = (cmdentry.u.bltin == execcmd) ? 0 : REDIR_PUSH;
|
|---|
| 989 | if (flags == EV_BACKCMD) {
|
|---|
| 990 | memout.nleft = 0;
|
|---|
| 991 | memout.nextc = memout.buf;
|
|---|
| 992 | memout.bufsize = 64;
|
|---|
| 993 | mode |= REDIR_BACKQ;
|
|---|
| 994 | }
|
|---|
| 995 | e = -1;
|
|---|
| 996 | savehandler = handler;
|
|---|
| 997 | savecmdname = commandname;
|
|---|
| 998 | handler = &jmploc;
|
|---|
| 999 | if (!setjmp(jmploc.loc)) {
|
|---|
| 1000 | /* We need to ensure the command hash table isn't
|
|---|
| 1001 | * corruped by temporary PATH assignments.
|
|---|
| 1002 | * However we must ensure the 'local' command works!
|
|---|
| 1003 | */
|
|---|
| 1004 | if (path != pathval() && (cmdentry.u.bltin == hashcmd ||
|
|---|
| 1005 | cmdentry.u.bltin == typecmd)) {
|
|---|
| 1006 | savelocalvars = localvars;
|
|---|
| 1007 | localvars = 0;
|
|---|
| 1008 | mklocal(path - 5 /* PATH= */, 0);
|
|---|
| 1009 | temp_path = 1;
|
|---|
| 1010 | } else
|
|---|
| 1011 | temp_path = 0;
|
|---|
| 1012 | redirect(cmd->ncmd.redirect, mode);
|
|---|
| 1013 |
|
|---|
| 1014 | /* exec is a special builtin, but needs this list... */
|
|---|
| 1015 | cmdenviron = varlist.list;
|
|---|
| 1016 | /* we must check 'readonly' flag for all builtins */
|
|---|
| 1017 | listsetvar(varlist.list,
|
|---|
| 1018 | cmdentry.cmdtype == CMDSPLBLTIN ? 0 : VNOSET);
|
|---|
| 1019 | commandname = argv[0];
|
|---|
| 1020 | /* initialize nextopt */
|
|---|
| 1021 | argptr = argv + 1;
|
|---|
| 1022 | optptr = NULL;
|
|---|
| 1023 | /* and getopt */
|
|---|
| 1024 | #if defined(__FreeBSD__) || defined(__EMX__) || defined(__APPLE__)
|
|---|
| 1025 | optreset = 1;
|
|---|
| 1026 | optind = 1;
|
|---|
| 1027 | #else
|
|---|
| 1028 | optind = 0; /* init */
|
|---|
| 1029 | #endif
|
|---|
| 1030 |
|
|---|
| 1031 | exitstatus = cmdentry.u.bltin(argc, argv);
|
|---|
| 1032 | } else {
|
|---|
| 1033 | e = exception;
|
|---|
| 1034 | exitstatus = e == EXINT ? SIGINT + 128 :
|
|---|
| 1035 | e == EXEXEC ? exerrno : 2;
|
|---|
| 1036 | }
|
|---|
| 1037 | handler = savehandler;
|
|---|
| 1038 | output_flushall();
|
|---|
| 1039 | out1 = &output;
|
|---|
| 1040 | out2 = &errout;
|
|---|
| 1041 | freestdout();
|
|---|
| 1042 | if (temp_path) {
|
|---|
| 1043 | poplocalvars();
|
|---|
| 1044 | localvars = savelocalvars;
|
|---|
| 1045 | }
|
|---|
| 1046 | cmdenviron = NULL;
|
|---|
| 1047 | if (e != EXSHELLPROC) {
|
|---|
| 1048 | commandname = savecmdname;
|
|---|
| 1049 | if (flags & EV_EXIT)
|
|---|
| 1050 | exitshell(exitstatus);
|
|---|
| 1051 | }
|
|---|
| 1052 | if (e != -1) {
|
|---|
| 1053 | if ((e != EXERROR && e != EXEXEC)
|
|---|
| 1054 | || cmdentry.cmdtype == CMDSPLBLTIN)
|
|---|
| 1055 | exraise(e);
|
|---|
| 1056 | FORCEINTON;
|
|---|
| 1057 | }
|
|---|
| 1058 | if (cmdentry.u.bltin != execcmd)
|
|---|
| 1059 | popredir();
|
|---|
| 1060 | if (flags == EV_BACKCMD) {
|
|---|
| 1061 | backcmd->buf = memout.buf;
|
|---|
| 1062 | backcmd->nleft = memout.nextc - memout.buf;
|
|---|
| 1063 | memout.buf = NULL;
|
|---|
| 1064 | }
|
|---|
| 1065 | break;
|
|---|
| 1066 |
|
|---|
| 1067 | default:
|
|---|
| 1068 | #ifdef DEBUG
|
|---|
| 1069 | trputs("normal command: "); trargs(argv);
|
|---|
| 1070 | #endif
|
|---|
| 1071 | clearredir(vforked);
|
|---|
| 1072 | redirect(cmd->ncmd.redirect, vforked ? REDIR_VFORK : 0);
|
|---|
| 1073 | if (!vforked)
|
|---|
| 1074 | for (sp = varlist.list ; sp ; sp = sp->next)
|
|---|
| 1075 | setvareq(sp->text, VEXPORT|VSTACK);
|
|---|
| 1076 | envp = environment();
|
|---|
| 1077 | shellexec(argv, envp, path, cmdentry.u.index, vforked);
|
|---|
| 1078 | break;
|
|---|
| 1079 | }
|
|---|
| 1080 | goto out;
|
|---|
| 1081 |
|
|---|
| 1082 | parent: /* parent process gets here (if we forked) */
|
|---|
| 1083 | if (mode == FORK_FG) { /* argument to fork */
|
|---|
| 1084 | exitstatus = waitforjob(jp);
|
|---|
| 1085 | } else if (mode == FORK_NOJOB) {
|
|---|
| 1086 | backcmd->fd = pip[0];
|
|---|
| 1087 | close(pip[1]);
|
|---|
| 1088 | backcmd->jp = jp;
|
|---|
| 1089 | }
|
|---|
| 1090 | FORCEINTON;
|
|---|
| 1091 |
|
|---|
| 1092 | out:
|
|---|
| 1093 | if (lastarg)
|
|---|
| 1094 | /* dsl: I think this is intended to be used to support
|
|---|
| 1095 | * '_' in 'vi' command mode during line editing...
|
|---|
| 1096 | * However I implemented that within libedit itself.
|
|---|
| 1097 | */
|
|---|
| 1098 | setvar("_", lastarg, 0);
|
|---|
| 1099 | popstackmark(&smark);
|
|---|
| 1100 |
|
|---|
| 1101 | if (eflag && exitstatus && !(flags & EV_TESTED))
|
|---|
| 1102 | exitshell(exitstatus);
|
|---|
| 1103 | }
|
|---|
| 1104 |
|
|---|
| 1105 |
|
|---|
| 1106 | /*
|
|---|
| 1107 | * Search for a command. This is called before we fork so that the
|
|---|
| 1108 | * location of the command will be available in the parent as well as
|
|---|
| 1109 | * the child. The check for "goodname" is an overly conservative
|
|---|
| 1110 | * check that the name will not be subject to expansion.
|
|---|
| 1111 | */
|
|---|
| 1112 |
|
|---|
| 1113 | STATIC void
|
|---|
| 1114 | prehash(union node *n)
|
|---|
| 1115 | {
|
|---|
| 1116 | struct cmdentry entry;
|
|---|
| 1117 |
|
|---|
| 1118 | if (n->type == NCMD && n->ncmd.args)
|
|---|
| 1119 | if (goodname(n->ncmd.args->narg.text))
|
|---|
| 1120 | find_command(n->ncmd.args->narg.text, &entry, 0,
|
|---|
| 1121 | pathval());
|
|---|
| 1122 | }
|
|---|
| 1123 |
|
|---|
| 1124 |
|
|---|
| 1125 |
|
|---|
| 1126 | /*
|
|---|
| 1127 | * Builtin commands. Builtin commands whose functions are closely
|
|---|
| 1128 | * tied to evaluation are implemented here.
|
|---|
| 1129 | */
|
|---|
| 1130 |
|
|---|
| 1131 | /*
|
|---|
| 1132 | * No command given.
|
|---|
| 1133 | */
|
|---|
| 1134 |
|
|---|
| 1135 | int
|
|---|
| 1136 | bltincmd(int argc, char **argv)
|
|---|
| 1137 | {
|
|---|
| 1138 | /*
|
|---|
| 1139 | * Preserve exitstatus of a previous possible redirection
|
|---|
| 1140 | * as POSIX mandates
|
|---|
| 1141 | */
|
|---|
| 1142 | return back_exitstatus;
|
|---|
| 1143 | }
|
|---|
| 1144 |
|
|---|
| 1145 |
|
|---|
| 1146 | /*
|
|---|
| 1147 | * Handle break and continue commands. Break, continue, and return are
|
|---|
| 1148 | * all handled by setting the evalskip flag. The evaluation routines
|
|---|
| 1149 | * above all check this flag, and if it is set they start skipping
|
|---|
| 1150 | * commands rather than executing them. The variable skipcount is
|
|---|
| 1151 | * the number of loops to break/continue, or the number of function
|
|---|
| 1152 | * levels to return. (The latter is always 1.) It should probably
|
|---|
| 1153 | * be an error to break out of more loops than exist, but it isn't
|
|---|
| 1154 | * in the standard shell so we don't make it one here.
|
|---|
| 1155 | */
|
|---|
| 1156 |
|
|---|
| 1157 | int
|
|---|
| 1158 | breakcmd(int argc, char **argv)
|
|---|
| 1159 | {
|
|---|
| 1160 | int n = argc > 1 ? number(argv[1]) : 1;
|
|---|
| 1161 |
|
|---|
| 1162 | if (n > loopnest)
|
|---|
| 1163 | n = loopnest;
|
|---|
| 1164 | if (n > 0) {
|
|---|
| 1165 | evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
|
|---|
| 1166 | skipcount = n;
|
|---|
| 1167 | }
|
|---|
| 1168 | return 0;
|
|---|
| 1169 | }
|
|---|
| 1170 |
|
|---|
| 1171 |
|
|---|
| 1172 | /*
|
|---|
| 1173 | * The return command.
|
|---|
| 1174 | */
|
|---|
| 1175 |
|
|---|
| 1176 | int
|
|---|
| 1177 | returncmd(int argc, char **argv)
|
|---|
| 1178 | {
|
|---|
| 1179 | int ret = argc > 1 ? number(argv[1]) : exitstatus;
|
|---|
| 1180 |
|
|---|
| 1181 | if (funcnest) {
|
|---|
| 1182 | evalskip = SKIPFUNC;
|
|---|
| 1183 | skipcount = 1;
|
|---|
| 1184 | return ret;
|
|---|
| 1185 | }
|
|---|
| 1186 | else {
|
|---|
| 1187 | /* Do what ksh does; skip the rest of the file */
|
|---|
| 1188 | evalskip = SKIPFILE;
|
|---|
| 1189 | skipcount = 1;
|
|---|
| 1190 | return ret;
|
|---|
| 1191 | }
|
|---|
| 1192 | }
|
|---|
| 1193 |
|
|---|
| 1194 |
|
|---|
| 1195 | int
|
|---|
| 1196 | falsecmd(int argc, char **argv)
|
|---|
| 1197 | {
|
|---|
| 1198 | return 1;
|
|---|
| 1199 | }
|
|---|
| 1200 |
|
|---|
| 1201 |
|
|---|
| 1202 | int
|
|---|
| 1203 | truecmd(int argc, char **argv)
|
|---|
| 1204 | {
|
|---|
| 1205 | return 0;
|
|---|
| 1206 | }
|
|---|
| 1207 |
|
|---|
| 1208 |
|
|---|
| 1209 | int
|
|---|
| 1210 | execcmd(int argc, char **argv)
|
|---|
| 1211 | {
|
|---|
| 1212 | if (argc > 1) {
|
|---|
| 1213 | struct strlist *sp;
|
|---|
| 1214 |
|
|---|
| 1215 | iflag = 0; /* exit on error */
|
|---|
| 1216 | mflag = 0;
|
|---|
| 1217 | optschanged();
|
|---|
| 1218 | for (sp = cmdenviron; sp; sp = sp->next)
|
|---|
| 1219 | setvareq(sp->text, VEXPORT|VSTACK);
|
|---|
| 1220 | shellexec(argv + 1, environment(), pathval(), 0, 0);
|
|---|
| 1221 | }
|
|---|
| 1222 | return 0;
|
|---|
| 1223 | }
|
|---|
| 1224 |
|
|---|
| 1225 | static int
|
|---|
| 1226 | conv_time(clock_t ticks, char *seconds, size_t l)
|
|---|
| 1227 | {
|
|---|
| 1228 | static clock_t tpm = 0;
|
|---|
| 1229 | clock_t mins;
|
|---|
| 1230 | int i;
|
|---|
| 1231 |
|
|---|
| 1232 | if (!tpm)
|
|---|
| 1233 | tpm = sysconf(_SC_CLK_TCK) * 60;
|
|---|
| 1234 |
|
|---|
| 1235 | mins = ticks / tpm;
|
|---|
| 1236 | snprintf(seconds, l, "%.4f", (ticks - mins * tpm) * 60.0 / tpm );
|
|---|
| 1237 |
|
|---|
| 1238 | if (seconds[0] == '6' && seconds[1] == '0') {
|
|---|
| 1239 | /* 59.99995 got rounded up... */
|
|---|
| 1240 | mins++;
|
|---|
| 1241 | strlcpy(seconds, "0.0", l);
|
|---|
| 1242 | return mins;
|
|---|
| 1243 | }
|
|---|
| 1244 |
|
|---|
| 1245 | /* suppress trailing zeros */
|
|---|
| 1246 | i = strlen(seconds) - 1;
|
|---|
| 1247 | for (; seconds[i] == '0' && seconds[i - 1] != '.'; i--)
|
|---|
| 1248 | seconds[i] = 0;
|
|---|
| 1249 | return mins;
|
|---|
| 1250 | }
|
|---|
| 1251 |
|
|---|
| 1252 | int
|
|---|
| 1253 | timescmd(int argc, char **argv)
|
|---|
| 1254 | {
|
|---|
| 1255 | struct tms tms;
|
|---|
| 1256 | int u, s, cu, cs;
|
|---|
| 1257 | char us[8], ss[8], cus[8], css[8];
|
|---|
| 1258 |
|
|---|
| 1259 | nextopt("");
|
|---|
| 1260 |
|
|---|
| 1261 | times(&tms);
|
|---|
| 1262 |
|
|---|
| 1263 | u = conv_time(tms.tms_utime, us, sizeof(us));
|
|---|
| 1264 | s = conv_time(tms.tms_stime, ss, sizeof(ss));
|
|---|
| 1265 | cu = conv_time(tms.tms_cutime, cus, sizeof(cus));
|
|---|
| 1266 | cs = conv_time(tms.tms_cstime, css, sizeof(css));
|
|---|
| 1267 |
|
|---|
| 1268 | outfmt(out1, "%dm%ss %dm%ss\n%dm%ss %dm%ss\n",
|
|---|
| 1269 | u, us, s, ss, cu, cus, cs, css);
|
|---|
| 1270 |
|
|---|
| 1271 | return 0;
|
|---|
| 1272 | }
|
|---|
