2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/28/95";
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD: head/bin/sh/main.c 364919 2020-08-28 15:35:45Z jilles $");
75 struct jmploc main_handler;
76 int localeisutf8, initial_localeisutf8;
78 static void reset(void);
79 static void cmdloop(int);
80 static void read_profile(const char *);
81 static char *find_dot_file(char *);
84 * Main routine. We initialize things, parse the arguments, execute
85 * profiles if we're a login shell, and then call cmdloop to execute
86 * commands. The setjmp call sets up the location to jump to when an
87 * exception occurs. When an exception occurs the variable "state"
88 * is used to figure out how far we had gotten.
92 main(int argc, char *argv[])
94 struct stackmark smark, smark2;
98 (void) setlocale(LC_ALL, "");
101 if (setjmp(main_handler.loc)) {
102 if (state == 0 || iflag == 0 || ! rootshell ||
104 exitshell(exitstatus);
106 if (exception == EXINT)
108 popstackmark(&smark);
109 FORCEINTON; /* enable interrupts */
119 handler = &main_handler;
122 trputs("Shell args: "); trargs(argv);
128 setstackmark(&smark);
129 setstackmark(&smark2);
130 procargs(argc, argv);
136 if (argv[0] && argv[0][0] == '-') {
138 read_profile("/etc/profile");
142 read_profile("${HOME-}/.profile");
144 read_profile("/etc/suid_profile");
148 if (!privileged && iflag) {
149 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
151 read_profile(shinit);
156 popstackmark(&smark2);
158 evalstring(minusc, sflag ? 0 : EV_EXIT);
161 if (sflag || minusc == NULL) {
164 exitshell(exitstatus);
177 * Read and execute commands. "Top" is nonzero for the top level command
178 * loop; it turns on prompting if the shell is interactive.
185 struct stackmark smark;
189 TRACE(("cmdloop(%d) called\n", top));
190 setstackmark(&smark);
197 showjobs(1, SHOWJOBS_DEFAULT);
202 /* showtree(n); DEBUG */
204 if (!top || numeof >= 50)
206 if (!stoppedjobs()) {
209 out2fmt_flush("\nUse \"exit\" to leave shell.\n");
212 } else if (n != NULL && nflag == 0) {
213 job_warning = (job_warning == 2) ? 1 : 0;
217 popstackmark(&smark);
218 setstackmark(&smark);
220 if (evalskip == SKIPRETURN)
225 popstackmark(&smark);
235 * Read /etc/profile or .profile. Return on error.
239 read_profile(const char *name)
242 const char *expandedname;
244 expandedname = expandstr(name);
245 if (expandedname == NULL)
248 if ((fd = open(expandedname, O_RDONLY | O_CLOEXEC_MAYBE)) >= 0)
260 * Read a file containing shell functions.
264 readcmdfile(const char *name)
266 setinputfile(name, 1);
274 * Take commands from a file. To be compatible we should do a path
275 * search for the file, which is necessary to find sub-commands.
280 find_dot_file(char *basename)
284 const char *path = pathval();
287 /* don't try this for absolute or relative paths */
288 if( strchr(basename, '/'))
291 while ((fullname = padvance(&path, &opt, basename)) != NULL) {
292 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
294 * Don't bother freeing here, since it will
295 * be freed by the caller.
305 dotcmd(int argc, char **argv)
307 char *filename, *fullname;
310 error("missing filename");
315 * Because we have historically not supported any options,
316 * only treat "--" specially.
318 filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1];
320 fullname = find_dot_file(filename);
321 setinputfile(fullname, 1);
322 commandname = fullname;
330 exitcmd(int argc, char **argv)
335 exitshell(number(argv[1]));
337 exitshell_savedstatus();