| 1 | /* $NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 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 | __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\
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| 40 | The Regents of the University of California. All rights reserved.\n");
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| 41 | #endif /* not lint */
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| 42 |
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| 43 | #ifndef lint
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| 44 | #if 0
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| 45 | static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95";
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| 46 | #else
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| 47 | __RCSID("$NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $");
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| 48 | #endif
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| 49 | #endif /* not lint */
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| 50 |
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| 51 | #include <errno.h>
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| 52 | #include <stdio.h>
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| 53 | #include <signal.h>
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| 54 | #include <sys/stat.h>
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| 55 | #include <unistd.h>
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| 56 | #include <locale.h>
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| 57 | #include <fcntl.h>
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| 58 |
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| 59 |
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| 60 | #include "shell.h"
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| 61 | #include "main.h"
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| 62 | #include "mail.h"
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| 63 | #include "options.h"
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| 64 | #include "output.h"
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| 65 | #include "parser.h"
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| 66 | #include "nodes.h"
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| 67 | #include "expand.h"
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| 68 | #include "eval.h"
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| 69 | #include "jobs.h"
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| 70 | #include "input.h"
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| 71 | #include "trap.h"
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| 72 | #include "var.h"
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| 73 | #include "show.h"
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| 74 | #include "memalloc.h"
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| 75 | #include "error.h"
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| 76 | #include "init.h"
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| 77 | #include "mystring.h"
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| 78 | #include "exec.h"
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| 79 | #include "cd.h"
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| 80 |
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| 81 | #define PROFILE 0
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| 82 |
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| 83 | int rootpid;
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| 84 | int rootshell;
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| 85 | STATIC union node *curcmd;
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| 86 | STATIC union node *prevcmd;
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| 87 |
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| 88 | STATIC void read_profile(const char *);
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| 89 | STATIC char *find_dot_file(char *);
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| 90 | int main(int, char **);
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| 91 |
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| 92 | /*
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| 93 | * Main routine. We initialize things, parse the arguments, execute
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| 94 | * profiles if we're a login shell, and then call cmdloop to execute
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| 95 | * commands. The setjmp call sets up the location to jump to when an
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| 96 | * exception occurs. When an exception occurs the variable "state"
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| 97 | * is used to figure out how far we had gotten.
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| 98 | */
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| 99 |
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| 100 | int
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| 101 | main(int argc, char **argv)
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| 102 | {
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| 103 | shinstance *psh;
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| 104 |
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| 105 | setlocale(LC_ALL, "");
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| 106 |
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| 107 | /*
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| 108 | * Create the root shell instance.
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| 109 | */
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| 110 | psh = create_root_shell(NULL, argc, argv);
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| 111 | if (!psh)
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| 112 | return 2;
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| 113 | return shell_main(psh, argc);
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| 114 | }
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| 115 |
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| 116 | int
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| 117 | shell_main(shinstance *psh, int argc, char **argv)
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| 118 | {
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| 119 | struct jmploc jmploc;
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| 120 | struct stackmark smark;
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| 121 | volatile int state;
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| 122 | char *shinit;
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| 123 |
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| 124 | state = 0;
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| 125 | if (setjmp(jmploc.loc)) {
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| 126 | /*
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| 127 | * When a shell procedure is executed, we raise the
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| 128 | * exception EXSHELLPROC to clean up before executing
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| 129 | * the shell procedure.
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| 130 | */
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| 131 | switch (exception) {
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| 132 | case EXSHELLPROC:
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| 133 | rootpid = getpid();
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| 134 | rootshell = 1;
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| 135 | minusc = NULL;
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| 136 | state = 3;
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| 137 | break;
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| 138 |
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| 139 | case EXEXEC:
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| 140 | exitstatus = exerrno;
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| 141 | break;
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| 142 |
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| 143 | case EXERROR:
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| 144 | exitstatus = 2;
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| 145 | break;
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| 146 |
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| 147 | default:
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| 148 | break;
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| 149 | }
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| 150 |
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| 151 | if (exception != EXSHELLPROC) {
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| 152 | if (state == 0 || iflag == 0 || ! rootshell)
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| 153 | exitshell(exitstatus);
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| 154 | }
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| 155 | reset();
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| 156 | if (exception == EXINT
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| 157 | #if ATTY
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| 158 | && (! attyset() || equal(termval(), "emacs"))
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| 159 | #endif
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| 160 | ) {
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| 161 | out2c('\n');
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| 162 | flushout(&errout);
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| 163 | }
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| 164 | popstackmark(&smark);
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| 165 | FORCEINTON; /* enable interrupts */
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| 166 | if (state == 1)
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| 167 | goto state1;
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| 168 | else if (state == 2)
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| 169 | goto state2;
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| 170 | else if (state == 3)
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| 171 | goto state3;
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| 172 | else
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| 173 | goto state4;
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| 174 | }
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| 175 | psh->handler = &jmploc;
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| 176 | #ifdef DEBUG
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| 177 | #if DEBUG == 2
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| 178 | debug = 1;
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| 179 | #endif
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| 180 | opentrace();
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| 181 | trputs("Shell args: "); trargs(argv);
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| 182 | #endif
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| 183 | psh->rootpid = getpid();
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| 184 | psh->rootshell = 1;
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| 185 | #ifdef _MSC_VER
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| 186 | {
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| 187 | extern void init_syntax(void);
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| 188 | init_syntax();
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| 189 | }
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| 190 | #endif
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| 191 | init();
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| 192 | setstackmark(&smark);
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| 193 | procargs(argc, argv);
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| 194 | if (argv[0] && argv[0][0] == '-') {
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| 195 | state = 1;
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| 196 | read_profile(psh, "/etc/profile");
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| 197 | state1:
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| 198 | state = 2;
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| 199 | read_profile(psh, ".profile");
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| 200 | }
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| 201 | state2:
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| 202 | state = 3;
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| 203 | if (getuid() == geteuid() && getgid() == getegid()) {
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| 204 | if ((shinit = lookupvar(psh, "ENV")) != NULL && *shinit != '\0') {
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| 205 | state = 3;
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| 206 | read_profile(psh, shinit);
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| 207 | }
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| 208 | }
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| 209 | state3:
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| 210 | state = 4;
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| 211 | if (sflag == 0 || minusc) {
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| 212 | static int sigs[] = {
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| 213 | SIGINT, SIGQUIT, SIGHUP,
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| 214 | #ifdef SIGTSTP
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| 215 | SIGTSTP,
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| 216 | #endif
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| 217 | SIGPIPE
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| 218 | };
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| 219 | #define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
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| 220 | int i;
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| 221 |
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| 222 | for (i = 0; i < SIGSSIZE; i++)
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| 223 | setsignal(psh, sigs[i], 0);
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| 224 | }
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| 225 |
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| 226 | if (psh->minusc)
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| 227 | evalstring(psh, psh->minusc, 0);
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| 228 |
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| 229 | if (psh->sflag || minusc == NULL) {
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| 230 | state4: /* XXX ??? - why isn't this before the "if" statement */
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| 231 | cmdloop(psh, 1);
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| 232 | }
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| 233 | exitshell(psh, psh->exitstatus);
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| 234 | /* NOTREACHED */
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| 235 | }
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| 236 |
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| 237 |
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| 238 | /*
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| 239 | * Read and execute commands. "Top" is nonzero for the top level command
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| 240 | * loop; it turns on prompting if the shell is interactive.
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| 241 | */
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| 242 |
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| 243 | void
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| 244 | cmdloop(int top)
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| 245 | {
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| 246 | union node *n;
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| 247 | struct stackmark smark;
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| 248 | int inter;
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| 249 | int numeof = 0;
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| 250 |
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| 251 | TRACE(("cmdloop(%d) called\n", top));
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| 252 | setstackmark(&smark);
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| 253 | for (;;) {
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| 254 | if (pendingsigs)
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| 255 | dotrap();
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| 256 | inter = 0;
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| 257 | if (iflag && top) {
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| 258 | inter = 1;
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| 259 | showjobs(out2, SHOW_CHANGED);
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| 260 | chkmail(0);
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| 261 | flushout(&errout);
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| 262 | }
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| 263 | n = parsecmd(inter);
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| 264 | /* showtree(n); DEBUG */
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| 265 | if (n == NEOF) {
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| 266 | if (!top || numeof >= 50)
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| 267 | break;
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| 268 | if (!stoppedjobs()) {
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| 269 | if (!Iflag)
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| 270 | break;
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| 271 | out2str("\nUse \"exit\" to leave shell.\n");
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| 272 | }
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| 273 | numeof++;
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| 274 | } else if (n != NULL && nflag == 0) {
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| 275 | job_warning = (job_warning == 2) ? 1 : 0;
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| 276 | numeof = 0;
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| 277 | evaltree(n, 0);
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| 278 | }
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| 279 | popstackmark(&smark);
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| 280 | setstackmark(&smark);
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| 281 | if (evalskip == SKIPFILE) {
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| 282 | evalskip = 0;
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| 283 | break;
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| 284 | }
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| 285 | }
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| 286 | popstackmark(&smark);
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| 287 | }
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| 288 |
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| 289 |
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| 290 |
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| 291 | /*
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| 292 | * Read /etc/profile or .profile. Return on error.
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| 293 | */
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| 294 |
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| 295 | STATIC void
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| 296 | read_profile(const char *name)
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| 297 | {
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| 298 | int fd;
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| 299 | int xflag_set = 0;
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| 300 | int vflag_set = 0;
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| 301 |
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| 302 | INTOFF;
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| 303 | if ((fd = open(name, O_RDONLY)) >= 0)
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| 304 | setinputfd(fd, 1);
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| 305 | INTON;
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| 306 | if (fd < 0)
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| 307 | return;
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| 308 | /* -q turns off -x and -v just when executing init files */
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| 309 | if (qflag) {
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| 310 | if (xflag)
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| 311 | xflag = 0, xflag_set = 1;
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| 312 | if (vflag)
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| 313 | vflag = 0, vflag_set = 1;
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| 314 | }
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| 315 | cmdloop(0);
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| 316 | if (qflag) {
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| 317 | if (xflag_set)
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| 318 | xflag = 1;
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| 319 | if (vflag_set)
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| 320 | vflag = 1;
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| 321 | }
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| 322 | popfile();
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| 323 | }
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| 324 |
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| 325 |
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| 326 |
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| 327 | /*
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| 328 | * Read a file containing shell functions.
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| 329 | */
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| 330 |
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| 331 | void
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| 332 | readcmdfile(char *name)
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| 333 | {
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| 334 | int fd;
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| 335 |
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| 336 | INTOFF;
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| 337 | if ((fd = open(name, O_RDONLY)) >= 0)
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| 338 | setinputfd(fd, 1);
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| 339 | else
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| 340 | error("Can't open %s", name);
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| 341 | INTON;
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| 342 | cmdloop(0);
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| 343 | popfile();
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| 344 | }
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| 345 |
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| 346 |
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| 347 |
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| 348 | /*
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| 349 | * Take commands from a file. To be compatible we should do a path
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| 350 | * search for the file, which is necessary to find sub-commands.
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| 351 | */
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| 352 |
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| 353 |
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| 354 | STATIC char *
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| 355 | find_dot_file(char *basename)
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| 356 | {
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| 357 | char *fullname;
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| 358 | const char *path = pathval();
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| 359 | struct stat statb;
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| 360 |
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| 361 | /* don't try this for absolute or relative paths */
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| 362 | if (strchr(basename, '/'))
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| 363 | return basename;
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| 364 |
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| 365 | while ((fullname = padvance(&path, basename)) != NULL) {
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| 366 | if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
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| 367 | /*
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| 368 | * Don't bother freeing here, since it will
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| 369 | * be freed by the caller.
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| 370 | */
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| 371 | return fullname;
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| 372 | }
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| 373 | stunalloc(fullname);
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| 374 | }
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| 375 |
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| 376 | /* not found in the PATH */
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| 377 | error("%s: not found", basename);
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| 378 | /* NOTREACHED */
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| 379 | }
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| 380 |
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| 381 | int
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| 382 | dotcmd(int argc, char **argv)
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| 383 | {
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| 384 | exitstatus = 0;
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| 385 |
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| 386 | if (argc >= 2) { /* That's what SVR2 does */
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| 387 | char *fullname;
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| 388 | struct stackmark smark;
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| 389 |
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| 390 | setstackmark(&smark);
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| 391 | fullname = find_dot_file(argv[1]);
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| 392 | setinputfile(fullname, 1);
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| 393 | commandname = fullname;
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| 394 | cmdloop(0);
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| 395 | popfile();
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| 396 | popstackmark(&smark);
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| 397 | }
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| 398 | return exitstatus;
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| 399 | }
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| 400 |
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| 401 |
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| 402 | int
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| 403 | exitcmd(int argc, char **argv)
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| 404 | {
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| 405 | if (stoppedjobs())
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| 406 | return 0;
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| 407 | if (argc > 1)
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| 408 | exitstatus = number(argv[1]);
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| 409 | exitshell(exitstatus);
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| 410 | /* NOTREACHED */
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| 411 | }
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