usr/dash/main.c

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>
#include <signal.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>


#include "shell.h"
#include "main.h"
#include "mail.h"
#include "options.h"
#include "output.h"
#include "parser.h"
#include "nodes.h"
#include "expand.h"
#include "eval.h"
#include "jobs.h"
#include "input.h"
#include "trap.h"
#include "var.h"
#include "show.h"
#include "memalloc.h"
#include "error.h"
#include "init.h"
#include "mystring.h"
#include "exec.h"
#include "cd.h"

#ifdef HETIO
#include "hetio.h"
#endif

#define PROFILE 0

int rootpid;
int shlvl;
#ifdef __GLIBC__
int *dash_errno;
#endif
#if PROFILE
short profile_buf[16384];
extern int etext();
#endif

STATIC void read_profile(const char *);
STATIC char *find_dot_file(char *);
static int cmdloop(int);
int main(int, char **);

/*
 * Main routine.  We initialize things, parse the arguments, execute
 * profiles if we're a login shell, and then call cmdloop to execute
 * commands.  The setjmp call sets up the location to jump to when an
 * exception occurs.  When an exception occurs the variable "state"
 * is used to figure out how far we had gotten.
 */

int
main(int argc, char **argv)
{
	char *shinit;
	volatile int state;
	struct jmploc jmploc;
	struct stackmark smark;

#ifdef __GLIBC__
	dash_errno = __errno_location();
#endif

#if PROFILE
	monitor(4, etext, profile_buf, sizeof profile_buf, 50);
#endif
	state = 0;
	if (unlikely(setjmp(jmploc.loc))) {
		int e;
		int s;

		reset();

		e = exception;
		if (e == EXERROR)
			exitstatus = 2;

		s = state;
		if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
			exitshell();

		if (e == EXINT
#if ATTY
		 && (! attyset() || equal(termval(), "emacs"))
#endif
		 ) {
			out2c('\n');
#ifdef FLUSHERR
			flushout(out2);
#endif
		}
		popstackmark(&smark);
		FORCEINTON;				/* enable interrupts */
		if (s == 1)
			goto state1;
		else if (s == 2)
			goto state2;
		else if (s == 3)
			goto state3;
		else
			goto state4;
	}
	handler = &jmploc;
#ifdef DEBUG
	opentrace();
	trputs("Shell args:  ");  trargs(argv);
#endif
	rootpid = getpid();
	init();
	setstackmark(&smark);
	procargs(argc, argv);
	if (argv[0] && argv[0][0] == '-') {
		state = 1;
		read_profile("/etc/profile");
state1:
		state = 2;
		read_profile(".profile");
	}
state2:
	state = 3;
	if (
#ifndef linux
		getuid() == geteuid() && getgid() == getegid() &&
#endif
		iflag
	) {
		if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
			read_profile(shinit);
		}
	}
state3:
	state = 4;
	if (minusc)
		evalstring(minusc, 0);

	if (sflag || minusc == NULL) {
state4:	/* XXX ??? - why isn't this before the "if" statement */
		cmdloop(1);
	}
#if PROFILE
	monitor(0);
#endif
#if GPROF
	{
		extern void _mcleanup(void);
		_mcleanup();
	}
#endif
	exitshell();
	/* NOTREACHED */
}


/*
 * Read and execute commands.  "Top" is nonzero for the top level command
 * loop; it turns on prompting if the shell is interactive.
 */

static int
cmdloop(int top)
{
	union node *n;
	struct stackmark smark;
	int inter;
	int numeof = 0;

	TRACE(("cmdloop(%d) called\n", top));
#ifdef HETIO
	if(iflag && top)
		hetio_init();
#endif
	for (;;) {
		int skip;

		setstackmark(&smark);
		if (jobctl)
			showjobs(out2, SHOW_CHANGED);
		inter = 0;
		if (iflag && top) {
			inter++;
			chkmail();
		}
		n = parsecmd(inter);
		/* showtree(n); DEBUG */
		if (n == NEOF) {
			if (!top || numeof >= 50)
				break;
			if (!stoppedjobs()) {
				if (!Iflag)
					break;
				out2str("\nUse \"exit\" to leave shell.\n");
			}
			numeof++;
		} else if (nflag == 0) {
			job_warning = (job_warning == 2) ? 1 : 0;
			numeof = 0;
			evaltree(n, 0);
		}
		popstackmark(&smark);

		skip = evalskip;
		if (skip) {
			evalskip = 0;
			return skip & SKIPEVAL;
		}
	}

	return 0;
}


/*
 * Read /etc/profile or .profile.  Return on error.
 */

STATIC void
read_profile(const char *name)
{
	int skip;

	if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
		return;

	skip = cmdloop(0);
	popfile();

	if (skip)
		exitshell();
}


/*
 * Read a file containing shell functions.
 */

void
readcmdfile(char *name)
{
	setinputfile(name, INPUT_PUSH_FILE);
	cmdloop(0);
	popfile();
}


/*
 * Take commands from a file.  To be compatible we should do a path
 * search for the file, which is necessary to find sub-commands.
 */


STATIC char *
find_dot_file(char *basename)
{
	char *fullname;
	const char *path = pathval();
	struct stat statb;

	/* don't try this for absolute or relative paths */
	if (strchr(basename, '/'))
		return basename;

	while ((fullname = padvance(&path, basename)) != NULL) {
		if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
			/*
			 * Don't bother freeing here, since it will
			 * be freed by the caller.
			 */
			return fullname;
		}
		stunalloc(fullname);
	}

	/* not found in the PATH */
	sh_error("%s: not found", basename);
	/* NOTREACHED */
}

int
dotcmd(int argc, char **argv)
{
	int status = 0;

	if (argc >= 2) {		/* That's what SVR2 does */
		char *fullname;

		fullname = find_dot_file(argv[1]);
		setinputfile(fullname, INPUT_PUSH_FILE);
		commandname = fullname;
		cmdloop(0);
		popfile();
		status = exitstatus;
	}
	return status;
}


int
exitcmd(int argc, char **argv)
{
	if (stoppedjobs())
		return 0;
	if (argc > 1)
		exitstatus = number(argv[1]);
	exraise(EXEXIT);
	/* NOTREACHED */
}
1	/*-
2	* Copyright (c) 1991, 1993
3	* The Regents of the University of California. All rights reserved.
4	* Copyright (c) 1997-2005
5	* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6	*
7	* This code is derived from software contributed to Berkeley by
8	* Kenneth Almquist.
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions
12	* are met:
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.
21	*
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
26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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
30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32	* SUCH DAMAGE.
33	*/
34
35	#include <stdio.h>
36	#include <signal.h>
37	#include <sys/stat.h>
38	#include <unistd.h>
39	#include <fcntl.h>
40
41
42	#include "shell.h"
43	#include "main.h"
44	#include "mail.h"
45	#include "options.h"
46	#include "output.h"
47	#include "parser.h"
48	#include "nodes.h"
49	#include "expand.h"
50	#include "eval.h"
51	#include "jobs.h"
52	#include "input.h"
53	#include "trap.h"
54	#include "var.h"
55	#include "show.h"
56	#include "memalloc.h"
57	#include "error.h"
58	#include "init.h"
59	#include "mystring.h"
60	#include "exec.h"
61	#include "cd.h"
62
63	#ifdef HETIO
64	#include "hetio.h"
65	#endif
66
67	#define PROFILE 0
68
69	int rootpid;
70	int shlvl;
71	#ifdef __GLIBC__
72	int *dash_errno;
73	#endif
74	#if PROFILE
75	short profile_buf[16384];
76	extern int etext();
77	#endif
78
79	STATIC void read_profile(const char *);
80	STATIC char find_dot_file(char );
81	static int cmdloop(int);
82	int main(int, char **);
83
84	/*
85	* Main routine. We initialize things, parse the arguments, execute
86	* profiles if we're a login shell, and then call cmdloop to execute
87	* commands. The setjmp call sets up the location to jump to when an
88	* exception occurs. When an exception occurs the variable "state"
89	* is used to figure out how far we had gotten.
90	*/
91
92	int
93	main(int argc, char **argv)
94	{
95	char *shinit;
96	volatile int state;
97	struct jmploc jmploc;
98	struct stackmark smark;
99
100	#ifdef __GLIBC__
101	dash_errno = __errno_location();
102	#endif
103
104	#if PROFILE
105	monitor(4, etext, profile_buf, sizeof profile_buf, 50);
106	#endif
107	state = 0;
108	if (unlikely(setjmp(jmploc.loc))) {
109	int e;
110	int s;
111
112	reset();
113
114	e = exception;
115	if (e == EXERROR)
116	exitstatus = 2;
117
118	s = state;
119	if (e == EXEXIT \|\| s == 0 \|\| iflag == 0 \|\| shlvl)
120	exitshell();
121
122	if (e == EXINT
123	#if ATTY
124	&& (! attyset() \|\| equal(termval(), "emacs"))
125	#endif
126	) {
127	out2c('\n');
128	#ifdef FLUSHERR
129	flushout(out2);
130	#endif
131	}
132	popstackmark(&smark);
133	FORCEINTON; /* enable interrupts */
134	if (s == 1)
135	goto state1;
136	else if (s == 2)
137	goto state2;
138	else if (s == 3)
139	goto state3;
140	else
141	goto state4;
142	}
143	handler = &jmploc;
144	#ifdef DEBUG
145	opentrace();
146	trputs("Shell args: "); trargs(argv);
147	#endif
148	rootpid = getpid();
149	init();
150	setstackmark(&smark);
151	procargs(argc, argv);
152	if (argv[0] && argv[0][0] == '-') {
153	state = 1;
154	read_profile("/etc/profile");
155	state1:
156	state = 2;
157	read_profile(".profile");
158	}
159	state2:
160	state = 3;
161	if (
162	#ifndef linux
163	getuid() == geteuid() && getgid() == getegid() &&
164	#endif
165	iflag
166	) {
167	if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
168	read_profile(shinit);
169	}
170	}
171	state3:
172	state = 4;
173	if (minusc)
174	evalstring(minusc, 0);
175
176	if (sflag \|\| minusc == NULL) {
177	state4: /* XXX ??? - why isn't this before the "if" statement */
178	cmdloop(1);
179	}
180	#if PROFILE
181	monitor(0);
182	#endif
183	#if GPROF
184	{
185	extern void _mcleanup(void);
186	_mcleanup();
187	}
188	#endif
189	exitshell();
190	/* NOTREACHED */
191	}
192
193
194	/*
195	* Read and execute commands. "Top" is nonzero for the top level command
196	* loop; it turns on prompting if the shell is interactive.
197	*/
198
199	static int
200	cmdloop(int top)
201	{
202	union node *n;
203	struct stackmark smark;
204	int inter;
205	int numeof = 0;
206
207	TRACE(("cmdloop(%d) called\n", top));
208	#ifdef HETIO
209	if(iflag && top)
210	hetio_init();
211	#endif
212	for (;;) {
213	int skip;
214
215	setstackmark(&smark);
216	if (jobctl)
217	showjobs(out2, SHOW_CHANGED);
218	inter = 0;
219	if (iflag && top) {
220	inter++;
221	chkmail();
222	}
223	n = parsecmd(inter);
224	/* showtree(n); DEBUG */
225	if (n == NEOF) {
226	if (!top \|\| numeof >= 50)
227	break;
228	if (!stoppedjobs()) {
229	if (!Iflag)
230	break;
231	out2str("\nUse \"exit\" to leave shell.\n");
232	}
233	numeof++;
234	} else if (nflag == 0) {
235	job_warning = (job_warning == 2) ? 1 : 0;
236	numeof = 0;
237	evaltree(n, 0);
238	}
239	popstackmark(&smark);
240
241	skip = evalskip;
242	if (skip) {
243	evalskip = 0;
244	return skip & SKIPEVAL;
245	}
246	}
247
248	return 0;
249	}
250
251
252
253	/*
254	* Read /etc/profile or .profile. Return on error.
255	*/
256
257	STATIC void
258	read_profile(const char *name)
259	{
260	int skip;
261
262	if (setinputfile(name, INPUT_PUSH_FILE \| INPUT_NOFILE_OK) < 0)
263	return;
264
265	skip = cmdloop(0);
266	popfile();
267
268	if (skip)
269	exitshell();
270	}
271
272
273
274	/*
275	* Read a file containing shell functions.
276	*/
277
278	void
279	readcmdfile(char *name)
280	{
281	setinputfile(name, INPUT_PUSH_FILE);
282	cmdloop(0);
283	popfile();
284	}
285
286
287
288	/*
289	* Take commands from a file. To be compatible we should do a path
290	* search for the file, which is necessary to find sub-commands.
291	*/
292
293
294	STATIC char *
295	find_dot_file(char *basename)
296	{
297	char *fullname;
298	const char *path = pathval();
299	struct stat statb;
300
301	/* don't try this for absolute or relative paths */
302	if (strchr(basename, '/'))
303	return basename;
304
305	while ((fullname = padvance(&path, basename)) != NULL) {
306	if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
307	/*
308	* Don't bother freeing here, since it will
309	* be freed by the caller.
310	*/
311	return fullname;
312	}
313	stunalloc(fullname);
314	}
315
316	/* not found in the PATH */
317	sh_error("%s: not found", basename);
318	/* NOTREACHED */
319	}
320
321	int
322	dotcmd(int argc, char **argv)
323	{
324	int status = 0;
325
326	if (argc >= 2) { /* That's what SVR2 does */
327	char *fullname;
328
329	fullname = find_dot_file(argv[1]);
330	setinputfile(fullname, INPUT_PUSH_FILE);
331	commandname = fullname;
332	cmdloop(0);
333	popfile();
334	status = exitstatus;
335	}
336	return status;
337	}
338
339
340	int
341	exitcmd(int argc, char **argv)
342	{
343	if (stoppedjobs())
344	return 0;
345	if (argc > 1)
346	exitstatus = number(argv[1]);
347	exraise(EXEXIT);
348	/* NOTREACHED */
349	}