| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | char copyright[] =
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| 39 | "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
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| 40 | 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 | static char sccsid[] = "@(#)main.c 5.2 (Berkeley) 3/13/91";
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| 45 | #endif /* not lint */
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| 46 |
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| 47 | #include <sys/types.h>
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| 48 | #include <signal.h>
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| 49 | #include <fcntl.h>
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| 50 | #include "shell.h"
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| 51 | #include "main.h"
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| 52 | #include "mail.h"
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| 53 | #include "options.h"
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| 54 | #include "output.h"
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| 55 | #include "parser.h"
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| 56 | #include "nodes.h"
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| 57 | #include "eval.h"
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| 58 | #include "jobs.h"
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| 59 | #include "input.h"
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| 60 | #include "trap.h"
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| 61 | #if ATTY
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| 62 | #include "var.h"
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| 63 | #endif
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| 64 | #include "memalloc.h"
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| 65 | #include "error.h"
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| 66 | #include "init.h"
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| 67 | #include "mystring.h"
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| 68 |
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| 69 | #define PROFILE 0
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| 70 |
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| 71 | int rootpid;
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| 72 | int rootshell;
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| 73 | STATIC union node *curcmd;
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| 74 | STATIC union node *prevcmd;
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| 75 | extern int errno;
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| 76 | #if PROFILE
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| 77 | short profile_buf[16384];
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| 78 | extern int etext();
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| 79 | #endif
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| 80 |
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| 81 | #ifdef __STDC__
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| 82 | STATIC void read_profile(char *);
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| 83 | char *getenv(char *);
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| 84 | #else
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| 85 | STATIC void read_profile();
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| 86 | char *getenv();
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| 87 | #endif
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| 88 |
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| 89 |
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| 90 | /*
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| 91 | * Main routine. We initialize things, parse the arguments, execute
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| 92 | * profiles if we're a login shell, and then call cmdloop to execute
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| 93 | * commands. The setjmp call sets up the location to jump to when an
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| 94 | * exception occurs. When an exception occurs the variable "state"
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| 95 | * is used to figure out how far we had gotten.
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| 96 | */
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| 97 |
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| 98 | main(argc, argv) char **argv; {
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| 99 | struct jmploc jmploc;
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| 100 | struct stackmark smark;
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| 101 | volatile int state;
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| 102 | char *shinit, *home;
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| 103 | char *profile = NULL, *ashrc = NULL;
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| 104 |
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| 105 | #if PROFILE
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| 106 | monitor(4, etext, profile_buf, sizeof profile_buf, 50);
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| 107 | #endif
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| 108 | state = 0;
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| 109 | if (setjmp(jmploc.loc)) {
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| 110 | /*
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| 111 | * When a shell procedure is executed, we raise the
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| 112 | * exception EXSHELLPROC to clean up before executing
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| 113 | * the shell procedure.
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| 114 | */
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| 115 | if (exception == EXSHELLPROC) {
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| 116 | rootpid = getpid();
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| 117 | rootshell = 1;
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| 118 | minusc = NULL;
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| 119 | state = 3;
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| 120 | } else if (state == 0 || iflag == 0 || ! rootshell)
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| 121 | exitshell(2);
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| 122 | reset();
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| 123 | #if ATTY
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| 124 | if (exception == EXINT
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| 125 | && (! attyset() || equal(termval(), "emacs"))) {
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| 126 | #else
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| 127 | if (exception == EXINT) {
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| 128 | #endif
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| 129 | out2c('\n');
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| 130 | flushout(&errout);
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| 131 | }
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| 132 | popstackmark(&smark);
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| 133 | FORCEINTON; /* enable interrupts */
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| 134 | if (state == 1)
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| 135 | goto state1;
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| 136 | else if (state == 2)
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| 137 | goto state2;
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| 138 | else if (state == 3)
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| 139 | goto state3;
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| 140 | else
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| 141 | goto state4;
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| 142 | }
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| 143 | handler = &jmploc;
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| 144 | #if DEBUG
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| 145 | opentrace();
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| 146 | trputs("Shell args: "); trargs(argv);
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| 147 | #endif
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| 148 | rootpid = getpid();
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| 149 | rootshell = 1;
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| 150 | init();
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| 151 | setstackmark(&smark);
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| 152 | procargs(argc, argv);
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| 153 | if (eflag) eflag = 2; /* Truly enable [ex]flag after init. */
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| 154 | if (xflag) xflag = 2;
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| 155 | if (argv[0] && argv[0][0] == '-') {
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| 156 | state = 1;
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| 157 | read_profile("/etc/profile");
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| 158 | state1:
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| 159 | state = 2;
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| 160 | if ((home = getenv("HOME")) != NULL
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| 161 | && (profile = (char *) malloc(strlen(home) + 10)) != NULL)
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| 162 | {
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| 163 | strcpy(profile, home);
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| 164 | strcat(profile, "/.profile");
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| 165 | read_profile(profile);
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| 166 | } else {
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| 167 | read_profile(".profile");
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| 168 | }
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| 169 | } else if ((sflag || minusc) && (shinit = getenv("SHINIT")) != NULL) {
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| 170 | state = 2;
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| 171 | evalstring(shinit);
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| 172 | }
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| 173 | state2:
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| 174 | if (profile != NULL) free(profile);
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| 175 |
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| 176 | state = 3;
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| 177 | if (!argv[0] || argv[0][0] != '-') {
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| 178 | if ((home = getenv("HOME")) != NULL
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| 179 | && (ashrc = (char *) malloc(strlen(home) + 8)) != NULL)
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| 180 | {
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| 181 | strcpy(ashrc, home);
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| 182 | strcat(ashrc, "/.ashrc");
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| 183 | read_profile(ashrc);
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| 184 | }
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| 185 | }
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| 186 | state3:
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| 187 | if (ashrc != NULL) free(ashrc);
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| 188 | if (eflag) eflag = 1; /* Init done, enable [ex]flag */
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| 189 | if (xflag) xflag = 1;
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| 190 | exitstatus = 0; /* Init shouldn't influence initial $? */
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| 191 |
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| 192 | state = 4;
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| 193 | if (minusc) {
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| 194 | evalstring(minusc);
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| 195 | }
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| 196 | if (sflag || minusc == NULL) {
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| 197 | state4:
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| 198 | cmdloop(1);
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| 199 | }
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| 200 | #if PROFILE
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| 201 | monitor(0);
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| 202 | #endif
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| 203 | exitshell(exitstatus);
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| 204 | }
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| 205 |
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| 206 |
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| 207 | /*
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| 208 | * Read and execute commands. "Top" is nonzero for the top level command
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| 209 | * loop; it turns on prompting if the shell is interactive.
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| 210 | */
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| 211 |
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| 212 | void
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| 213 | cmdloop(top) {
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| 214 | union node *n;
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| 215 | struct stackmark smark;
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| 216 | int inter;
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| 217 | int numeof;
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| 218 |
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| 219 | TRACE(("cmdloop(%d) called\n", top));
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| 220 | setstackmark(&smark);
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| 221 | numeof = 0;
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| 222 | for (;;) {
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| 223 | if (pendingsigs)
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| 224 | dotrap();
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| 225 | inter = 0;
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| 226 | if (iflag && top) {
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| 227 | inter++;
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| 228 | showjobs(1);
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| 229 | chkmail(0);
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| 230 | flushout(&output);
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| 231 | }
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| 232 | n = parsecmd(inter);
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| 233 | #if DEBUG
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| 234 | /* showtree(n); */
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| 235 | #endif
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| 236 | if (n == NEOF) {
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| 237 | if (Iflag == 0 || numeof >= 50)
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| 238 | break;
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| 239 | out2str("\nUse \"exit\" to leave shell.\n");
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| 240 | numeof++;
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| 241 | } else if (n != NULL && nflag == 0) {
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| 242 | if (inter) {
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| 243 | INTOFF;
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| 244 | if (prevcmd)
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| 245 | freefunc(prevcmd);
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| 246 | prevcmd = curcmd;
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| 247 | curcmd = copyfunc(n);
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| 248 | INTON;
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| 249 | }
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| 250 | evaltree(n, 0);
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| 251 | #ifdef notdef
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| 252 | if (exitstatus) /*DEBUG*/
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| 253 | outfmt(&errout, "Exit status 0x%X\n", exitstatus);
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| 254 | #endif
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| 255 | }
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| 256 | popstackmark(&smark);
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| 257 | }
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| 258 | popstackmark(&smark); /* unnecessary */
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| 259 | }
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| 260 |
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| 261 |
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| 262 |
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| 263 | /*
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| 264 | * Read /etc/profile or .profile. Return on error.
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| 265 | */
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| 266 |
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| 267 | STATIC void
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| 268 | read_profile(name)
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| 269 | char *name;
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| 270 | {
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| 271 | int fd;
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| 272 |
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| 273 | INTOFF;
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| 274 | if ((fd = open(name, O_RDONLY)) >= 0)
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| 275 | setinputfd(fd, 1);
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| 276 | INTON;
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| 277 | if (fd < 0)
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| 278 | return;
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| 279 | cmdloop(0);
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| 280 | popfile();
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| 281 | }
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| 282 |
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| 283 |
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| 284 |
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| 285 | /*
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| 286 | * Read a file containing shell functions.
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| 287 | */
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| 288 |
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| 289 | void
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| 290 | readcmdfile(name)
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| 291 | char *name;
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| 292 | {
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| 293 | int fd;
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| 294 |
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| 295 | INTOFF;
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| 296 | if ((fd = open(name, O_RDONLY)) >= 0)
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| 297 | setinputfd(fd, 1);
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| 298 | else
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| 299 | error("Can't open %s", name);
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| 300 | INTON;
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| 301 | cmdloop(0);
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| 302 | popfile();
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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 | * Take commands from a file. To be compatable we should do a path
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| 308 | * search for the file, but a path search doesn't make any sense.
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| 309 | */
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| 310 |
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| 311 | dotcmd(argc, argv) char **argv; {
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| 312 | exitstatus = 0;
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| 313 | if (argc >= 2) { /* That's what SVR2 does */
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| 314 | setinputfile(argv[1], 1);
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| 315 | commandname = argv[1];
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| 316 | cmdloop(0);
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| 317 | popfile();
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| 318 | }
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| 319 | return exitstatus;
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| 320 | }
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| 321 |
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| 322 |
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| 323 | exitcmd(argc, argv) char **argv; {
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| 324 | extern int oexitstatus;
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| 325 | if (argc > 1)
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| 326 | exitstatus = number(argv[1]);
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| 327 | else
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| 328 | exitstatus = oexitstatus;
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| 329 | exitshell(exitstatus);
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| 330 | }
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| 331 |
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| 332 |
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| 333 | lccmd(argc, argv) char **argv; {
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| 334 | if (argc > 1) {
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| 335 | defun(argv[1], prevcmd);
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| 336 | return 0;
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| 337 | } else {
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| 338 | INTOFF;
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| 339 | freefunc(curcmd);
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| 340 | curcmd = prevcmd;
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| 341 | prevcmd = NULL;
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| 342 | INTON;
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| 343 | evaltree(curcmd, 0);
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| 344 | return exitstatus;
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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 |
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| 350 | #ifdef notdef
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| 351 | /*
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| 352 | * Should never be called.
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| 353 | */
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| 354 |
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| 355 | void
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| 356 | exit(exitstatus) {
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| 357 | _exit(exitstatus);
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| 358 | }
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| 359 | #endif
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