| 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 | #if 0
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| 36 | #ifndef lint
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| 37 | __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\
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| 38 | The Regents of the University of California. All rights reserved.\n");
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| 39 | #endif /* not lint */
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| 40 | #ifndef lint
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| 41 | static char sccsid[] = "@(#)main.c 8.7 (Berkeley) 7/19/95";
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| 42 | #else
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| 43 | __RCSID("$NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $");
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| 44 | #endif /* not lint */
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| 45 | #endif
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| 46 |
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| 47 | #include <errno.h>
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| 48 | #include <stdio.h>
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| 49 | #include <sys/stat.h>
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| 50 | #include <locale.h>
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| 51 |
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| 52 |
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| 53 | #include "shell.h"
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| 54 | #include "main.h"
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| 55 | #include "mail.h"
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| 56 | #include "options.h"
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| 57 | #include "output.h"
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| 58 | #include "parser.h"
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| 59 | #include "nodes.h"
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| 60 | #include "expand.h"
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| 61 | #include "eval.h"
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| 62 | #include "jobs.h"
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| 63 | #include "input.h"
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| 64 | #include "trap.h"
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| 65 | #include "var.h"
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| 66 | #include "show.h"
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| 67 | #include "memalloc.h"
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| 68 | #include "error.h"
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| 69 | #include "init.h"
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| 70 | #include "mystring.h"
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| 71 | #include "exec.h"
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| 72 | #include "cd.h"
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| 73 | #include "shinstance.h"
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| 74 |
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| 75 | #define PROFILE 0
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| 76 |
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| 77 | /*int rootpid;
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| 78 | int rootshell;*/
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| 79 | #ifdef unused_variables
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| 80 | STATIC union node *curcmd;
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| 81 | STATIC union node *prevcmd;
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| 82 | #endif
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| 83 |
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| 84 | STATIC void read_profile(struct shinstance *, const char *);
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| 85 | STATIC char *find_dot_file(struct shinstance *, char *);
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| 86 | int main(int, char **);
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| 87 | int shell_main(shinstance *, int, char **);
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| 88 | #ifdef _MSC_VER
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| 89 | extern void init_syntax(void);
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| 90 | #endif
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| 91 | STATIC int usage(const char *argv0);
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| 92 | STATIC int version(const char *argv0);
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| 93 |
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| 94 | /*
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| 95 | * Main routine. We initialize things, parse the arguments, execute
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| 96 | * profiles if we're a login shell, and then call cmdloop to execute
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| 97 | * commands. The setjmp call sets up the location to jump to when an
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| 98 | * exception occurs. When an exception occurs the variable "state"
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| 99 | * is used to figure out how far we had gotten.
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| 100 | */
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| 101 |
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| 102 | int
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| 103 | main(int argc, char **argv)
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| 104 | {
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| 105 | shinstance *psh;
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| 106 |
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| 107 | /*
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| 108 | * Global initializations.
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| 109 | */
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| 110 | setlocale(LC_ALL, "");
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| 111 | #ifdef _MSC_VER
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| 112 | init_syntax();
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| 113 | #endif
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| 114 |
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| 115 | /*
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| 116 | * Check for --version and --help.
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| 117 | */
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| 118 | if (argc > 1 && argv[1][0] == '-' && argv[1][1] == '-') {
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| 119 | if (!strcmp(argv[1], "--help"))
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| 120 | return usage(argv[0]);
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| 121 | if (!strcmp(argv[1], "--version"))
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| 122 | return version(argv[0]);
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| 123 | }
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| 124 |
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| 125 | /*
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| 126 | * Create the root shell instance.
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| 127 | */
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| 128 | psh = sh_create_root_shell(NULL, argc, argv);
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| 129 | if (!psh)
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| 130 | return 2;
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| 131 | shthread_set_shell(psh);
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| 132 | return shell_main(psh, argc, argv);
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| 133 | }
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| 134 |
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| 135 | int
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| 136 | shell_main(shinstance *psh, int argc, char **argv)
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| 137 | {
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| 138 | struct jmploc jmploc;
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| 139 | struct stackmark smark;
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| 140 | volatile int state;
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| 141 | char *shinit;
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| 142 |
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| 143 | state = 0;
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| 144 | if (setjmp(jmploc.loc)) {
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| 145 | /*
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| 146 | * When a shell procedure is executed, we raise the
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| 147 | * exception EXSHELLPROC to clean up before executing
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| 148 | * the shell procedure.
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| 149 | */
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| 150 | switch (psh->exception) {
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| 151 | case EXSHELLPROC:
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| 152 | psh->rootpid = /*getpid()*/ psh->pid;
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| 153 | psh->rootshell = 1;
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| 154 | psh->minusc = NULL;
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| 155 | state = 3;
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| 156 | break;
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| 157 |
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| 158 | case EXEXEC:
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| 159 | psh->exitstatus = psh->exerrno;
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| 160 | break;
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| 161 |
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| 162 | case EXERROR:
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| 163 | psh->exitstatus = 2;
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| 164 | break;
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| 165 |
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| 166 | default:
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| 167 | break;
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| 168 | }
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| 169 |
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| 170 | if (psh->exception != EXSHELLPROC) {
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| 171 | if (state == 0 || iflag(psh) == 0 || ! psh->rootshell)
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| 172 | exitshell(psh, psh->exitstatus);
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| 173 | }
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| 174 | reset(psh);
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| 175 | if (psh->exception == EXINT
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| 176 | #if ATTY
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| 177 | && (! attyset(psh) || equal(termval(psh), "emacs"))
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| 178 | #endif
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| 179 | ) {
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| 180 | out2c(psh, '\n');
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| 181 | flushout(&psh->errout);
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| 182 | }
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| 183 | popstackmark(psh, &smark);
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| 184 | FORCEINTON; /* enable interrupts */
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| 185 | if (state == 1)
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| 186 | goto state1;
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| 187 | else if (state == 2)
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| 188 | goto state2;
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| 189 | else if (state == 3)
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| 190 | goto state3;
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| 191 | else
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| 192 | goto state4;
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| 193 | }
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| 194 | psh->handler = &jmploc;
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| 195 | psh->rootpid = /*getpid()*/ psh->pid;
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| 196 | psh->rootshell = 1;
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| 197 | #ifdef DEBUG
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| 198 | #if DEBUG == 2
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| 199 | debug(psh) = 1;
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| 200 | #endif
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| 201 | opentrace(psh);
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| 202 | trputs(psh, "Shell args: "); trargs(psh, argv);
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| 203 | #endif
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| 204 |
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| 205 | init(psh);
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| 206 | setstackmark(psh, &smark);
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| 207 | procargs(psh, argc, argv);
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| 208 | if (argv[0] && argv[0][0] == '-') {
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| 209 | state = 1;
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| 210 | read_profile(psh, "/etc/profile");
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| 211 | state1:
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| 212 | state = 2;
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| 213 | read_profile(psh, ".profile");
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| 214 | }
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| 215 | state2:
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| 216 | state = 3;
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| 217 | if (sh_getuid(psh) == sh_geteuid(psh) && sh_getgid(psh) == sh_getegid(psh)) {
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| 218 | if ((shinit = lookupvar(psh, "ENV")) != NULL && *shinit != '\0') {
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| 219 | state = 3;
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| 220 | read_profile(psh, shinit);
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| 221 | }
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| 222 | }
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| 223 | state3:
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| 224 | state = 4;
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| 225 | if (sflag(psh) == 0 || psh->minusc) {
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| 226 | static int sigs[] = {
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| 227 | SIGINT, SIGQUIT, SIGHUP,
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| 228 | #ifdef SIGTSTP
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| 229 | SIGTSTP,
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| 230 | #endif
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| 231 | SIGPIPE
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| 232 | };
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| 233 | #define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
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| 234 | int i;
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| 235 |
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| 236 | for (i = 0; i < SIGSSIZE; i++)
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| 237 | setsignal(psh, sigs[i], 0);
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| 238 | }
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| 239 |
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| 240 | if (psh->minusc)
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| 241 | evalstring(psh, psh->minusc, 0);
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| 242 |
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| 243 | if (sflag(psh) || psh->minusc == NULL) {
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| 244 | state4: /* XXX ??? - why isn't this before the "if" statement */
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| 245 | cmdloop(psh, 1);
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| 246 | }
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| 247 | exitshell(psh, psh->exitstatus);
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| 248 | /* NOTREACHED */
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| 249 | return 1;
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| 250 | }
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| 251 |
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| 252 |
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| 253 | /*
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| 254 | * Read and execute commands. "Top" is nonzero for the top level command
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| 255 | * loop; it turns on prompting if the shell is interactive.
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| 256 | */
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| 257 |
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| 258 | void
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| 259 | cmdloop(struct shinstance *psh, int top)
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| 260 | {
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| 261 | union node *n;
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| 262 | struct stackmark smark;
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| 263 | int inter;
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| 264 | int numeof = 0;
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| 265 |
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| 266 | TRACE((psh, "cmdloop(%d) called\n", top));
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| 267 | setstackmark(psh, &smark);
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| 268 | for (;;) {
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| 269 | if (psh->pendingsigs)
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| 270 | dotrap(psh);
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| 271 | inter = 0;
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| 272 | if (iflag(psh) && top) {
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| 273 | inter = 1;
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| 274 | showjobs(psh, psh->out2, SHOW_CHANGED);
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| 275 | chkmail(psh, 0);
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| 276 | flushout(&psh->errout);
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| 277 | }
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| 278 | n = parsecmd(psh, inter);
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| 279 | /* showtree(n); DEBUG */
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| 280 | if (n == NEOF) {
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| 281 | if (!top || numeof >= 50)
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| 282 | break;
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| 283 | if (!stoppedjobs(psh)) {
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| 284 | if (!Iflag(psh))
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| 285 | break;
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| 286 | out2str(psh, "\nUse \"exit\" to leave shell.\n");
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| 287 | }
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| 288 | numeof++;
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| 289 | } else if (n != NULL && nflag(psh) == 0) {
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| 290 | psh->job_warning = (psh->job_warning == 2) ? 1 : 0;
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| 291 | numeof = 0;
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| 292 | evaltree(psh, n, 0);
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| 293 | }
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| 294 | popstackmark(psh, &smark);
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| 295 | setstackmark(psh, &smark);
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| 296 | if (psh->evalskip == SKIPFILE) {
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| 297 | psh->evalskip = 0;
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| 298 | break;
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| 299 | }
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| 300 | }
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| 301 | popstackmark(psh, &smark);
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| 302 | }
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| 303 |
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| 304 |
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| 305 |
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| 306 | /*
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| 307 | * Read /etc/profile or .profile. Return on error.
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| 308 | */
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| 309 |
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| 310 | STATIC void
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| 311 | read_profile(struct shinstance *psh, const char *name)
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| 312 | {
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| 313 | int fd;
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| 314 | int xflag_set = 0;
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| 315 | int vflag_set = 0;
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| 316 |
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| 317 | INTOFF;
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| 318 | if ((fd = shfile_open(&psh->fdtab, name, O_RDONLY, 0)) >= 0)
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| 319 | setinputfd(psh, fd, 1);
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| 320 | INTON;
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| 321 | if (fd < 0)
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| 322 | return;
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| 323 | /* -q turns off -x and -v just when executing init files */
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| 324 | if (qflag(psh)) {
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| 325 | if (xflag(psh))
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| 326 | xflag(psh) = 0, xflag_set = 1;
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| 327 | if (vflag(psh))
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| 328 | vflag(psh) = 0, vflag_set = 1;
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| 329 | }
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| 330 | cmdloop(psh, 0);
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| 331 | if (qflag(psh)) {
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| 332 | if (xflag_set)
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| 333 | xflag(psh) = 1;
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| 334 | if (vflag_set)
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| 335 | vflag(psh) = 1;
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| 336 | }
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| 337 | popfile(psh);
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| 338 | }
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| 339 |
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| 340 |
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| 341 |
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| 342 | /*
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| 343 | * Read a file containing shell functions.
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| 344 | */
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| 345 |
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| 346 | void
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| 347 | readcmdfile(struct shinstance *psh, char *name)
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| 348 | {
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| 349 | int fd;
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| 350 |
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| 351 | INTOFF;
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| 352 | if ((fd = shfile_open(&psh->fdtab, name, O_RDONLY, 0)) >= 0)
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| 353 | setinputfd(psh, fd, 1);
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| 354 | else
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| 355 | error(psh, "Can't open %s", name);
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| 356 | INTON;
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| 357 | cmdloop(psh, 0);
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| 358 | popfile(psh);
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| 359 | }
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| 360 |
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| 361 |
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| 362 |
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| 363 | /*
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| 364 | * Take commands from a file. To be compatible we should do a path
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| 365 | * search for the file, which is necessary to find sub-commands.
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| 366 | */
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| 367 |
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| 368 |
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| 369 | STATIC char *
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| 370 | find_dot_file(struct shinstance *psh, char *basename)
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| 371 | {
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| 372 | char *fullname;
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| 373 | const char *path = pathval(psh);
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| 374 | struct stat statb;
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| 375 |
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| 376 | /* don't try this for absolute or relative paths */
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| 377 | if (strchr(basename, '/'))
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| 378 | return basename;
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| 379 |
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| 380 | while ((fullname = padvance(psh, &path, basename)) != NULL) {
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| 381 | if ((shfile_stat(&psh->fdtab, fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
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| 382 | /*
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| 383 | * Don't bother freeing here, since it will
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| 384 | * be freed by the caller.
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| 385 | */
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| 386 | return fullname;
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| 387 | }
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| 388 | stunalloc(psh, fullname);
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| 389 | }
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| 390 |
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| 391 | /* not found in the PATH */
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| 392 | error(psh, "%s: not found", basename);
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| 393 | /* NOTREACHED */
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| 394 | return NULL;
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| 395 | }
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| 396 |
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| 397 | int
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| 398 | dotcmd(struct shinstance *psh, int argc, char **argv)
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| 399 | {
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| 400 | psh->exitstatus = 0;
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| 401 |
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| 402 | if (argc >= 2) { /* That's what SVR2 does */
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| 403 | char *fullname;
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| 404 | struct stackmark smark;
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| 405 |
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| 406 | setstackmark(psh, &smark);
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| 407 | fullname = find_dot_file(psh, argv[1]);
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| 408 | setinputfile(psh, fullname, 1);
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| 409 | psh->commandname = fullname;
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| 410 | cmdloop(psh, 0);
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| 411 | popfile(psh);
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| 412 | popstackmark(psh, &smark);
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| 413 | }
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| 414 | return psh->exitstatus;
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| 415 | }
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| 416 |
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| 417 |
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| 418 | int
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| 419 | exitcmd(struct shinstance *psh, int argc, char **argv)
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| 420 | {
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| 421 | if (stoppedjobs(psh))
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| 422 | return 0;
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| 423 | if (argc > 1)
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| 424 | psh->exitstatus = number(psh, argv[1]);
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| 425 | exitshell(psh, psh->exitstatus);
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| 426 | /* NOTREACHED */
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| 427 | return 1;
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| 428 | }
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| 429 |
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| 430 |
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| 431 | STATIC const char *
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| 432 | strip_argv0(const char *argv0, size_t *lenp)
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| 433 | {
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| 434 | const char *tmp;
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| 435 |
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| 436 | /* skip the path */
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| 437 | for (tmp = strpbrk(argv0, "\\/:"); tmp; tmp = strpbrk(argv0, "\\/:"))
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| 438 | argv0 = tmp + 1;
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| 439 |
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| 440 | /* find the end, ignoring extenions */
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| 441 | tmp = strrchr(argv0, '.');
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| 442 | if (!tmp)
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| 443 | tmp = strchr(argv0, '\0');
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| 444 | *lenp = tmp - argv0;
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| 445 | return argv0;
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| 446 | }
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| 447 |
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| 448 | STATIC int
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| 449 | usage(const char *argv0)
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| 450 | {
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| 451 | size_t len;
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| 452 | argv0 = strip_argv0(argv0, &len);
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| 453 |
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| 454 | fprintf(stdout,
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| 455 | "usage: %.*s [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
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| 456 | " [+o option_name] [command_file [argument ...]]\n"
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| 457 | " or: %.*s -c [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
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| 458 | " [+o option_name] command_string [command_name [argument ...]]\n"
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| 459 | " or: %.*s -s [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
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| 460 | " [+o option_name] [argument ...]\n"
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| 461 | " or: %.*s --help\n"
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| 462 | " or: %.*s --version\n",
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| 463 | len, argv0, len, argv0, len, argv0, len, argv0, len, argv0);
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| 464 | return 0;
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| 465 | }
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| 466 |
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| 467 | STATIC int
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| 468 | version(const char *argv0)
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| 469 | {
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| 470 | size_t len;
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| 471 | strip_argv0(argv0, &len);
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| 472 |
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| 473 | fprintf(stdout,
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| 474 | "%.*s - kBuild version %d.%d.%d\n",
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| 475 | len, argv0,
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| 476 | KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH);
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| 477 | return 0;
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| 478 | }
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| 479 |
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| 480 |
|
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| 481 | /*
|
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| 482 | * Local Variables:
|
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| 483 | * c-file-style: bsd
|
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| 484 | * End:
|
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| 485 | */
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