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