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;
	int login;

#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);
	login = procargs(argc, argv);
	if (login) {
		state = 1;
		read_profile("/etc/profile");
state1:
		state = 2;
		read_profile("$HOME/.profile");
	}
state2:
	state = 3;
	if (
#ifndef linux
		getuid() == geteuid() && getgid() == getegid() &&
#endif
		iflag
	) {
		if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
			read_profile(shinit);
		}
	}
	popstackmark(&smark);
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;
			break;
		}
	}

	return 0;
}


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

STATIC void
read_profile(const char *name)
{
	name = expandstr(name);
	if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
		return;

	cmdloop(0);
	popfile();
}


/*
 * 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	int login;
100
101	#ifdef __GLIBC__
102	dash_errno = __errno_location();
103	#endif
104
105	#if PROFILE
106	monitor(4, etext, profile_buf, sizeof profile_buf, 50);
107	#endif
108	state = 0;
109	if (unlikely(setjmp(jmploc.loc))) {
110	int e;
111	int s;
112
113	reset();
114
115	e = exception;
116	if (e == EXERROR)
117	exitstatus = 2;
118
119	s = state;
120	if (e == EXEXIT \|\| s == 0 \|\| iflag == 0 \|\| shlvl)
121	exitshell();
122
123	if (e == EXINT
124	#if ATTY
125	&& (! attyset() \|\| equal(termval(), "emacs"))
126	#endif
127	) {
128	out2c('\n');
129	#ifdef FLUSHERR
130	flushout(out2);
131	#endif
132	}
133	popstackmark(&smark);
134	FORCEINTON; /* enable interrupts */
135	if (s == 1)
136	goto state1;
137	else if (s == 2)
138	goto state2;
139	else if (s == 3)
140	goto state3;
141	else
142	goto state4;
143	}
144	handler = &jmploc;
145	#ifdef DEBUG
146	opentrace();
147	trputs("Shell args: "); trargs(argv);
148	#endif
149	rootpid = getpid();
150	init();
151	setstackmark(&smark);
152	login = procargs(argc, argv);
153	if (login) {
154	state = 1;
155	read_profile("/etc/profile");
156	state1:
157	state = 2;
158	read_profile("$HOME/.profile");
159	}
160	state2:
161	state = 3;
162	if (
163	#ifndef linux
164	getuid() == geteuid() && getgid() == getegid() &&
165	#endif
166	iflag
167	) {
168	if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
169	read_profile(shinit);
170	}
171	}
172	popstackmark(&smark);
173	state3:
174	state = 4;
175	if (minusc)
176	evalstring(minusc, 0);
177
178	if (sflag \|\| minusc == NULL) {
179	state4: /* XXX ??? - why isn't this before the "if" statement */
180	cmdloop(1);
181	}
182	#if PROFILE
183	monitor(0);
184	#endif
185	#if GPROF
186	{
187	extern void _mcleanup(void);
188	_mcleanup();
189	}
190	#endif
191	exitshell();
192	/* NOTREACHED */
193	}
194
195
196	/*
197	* Read and execute commands. "Top" is nonzero for the top level command
198	* loop; it turns on prompting if the shell is interactive.
199	*/
200
201	static int
202	cmdloop(int top)
203	{
204	union node *n;
205	struct stackmark smark;
206	int inter;
207	int numeof = 0;
208
209	TRACE(("cmdloop(%d) called\n", top));
210	#ifdef HETIO
211	if(iflag && top)
212	hetio_init();
213	#endif
214	for (;;) {
215	int skip;
216
217	setstackmark(&smark);
218	if (jobctl)
219	showjobs(out2, SHOW_CHANGED);
220	inter = 0;
221	if (iflag && top) {
222	inter++;
223	chkmail();
224	}
225	n = parsecmd(inter);
226	/* showtree(n); DEBUG */
227	if (n == NEOF) {
228	if (!top \|\| numeof >= 50)
229	break;
230	if (!stoppedjobs()) {
231	if (!Iflag)
232	break;
233	out2str("\nUse \"exit\" to leave shell.\n");
234	}
235	numeof++;
236	} else if (nflag == 0) {
237	job_warning = (job_warning == 2) ? 1 : 0;
238	numeof = 0;
239	evaltree(n, 0);
240	}
241	popstackmark(&smark);
242
243	skip = evalskip;
244	if (skip) {
245	evalskip = 0;
246	break;
247	}
248	}
249
250	return 0;
251	}
252
253
254
255	/*
256	* Read /etc/profile or .profile. Return on error.
257	*/
258
259	STATIC void
260	read_profile(const char *name)
261	{
262	name = expandstr(name);
263	if (setinputfile(name, INPUT_PUSH_FILE \| INPUT_NOFILE_OK) < 0)
264	return;
265
266	cmdloop(0);
267	popfile();
268	}
269
270
271
272	/*
273	* Read a file containing shell functions.
274	*/
275
276	void
277	readcmdfile(char *name)
278	{
279	setinputfile(name, INPUT_PUSH_FILE);
280	cmdloop(0);
281	popfile();
282	}
283
284
285
286	/*
287	* Take commands from a file. To be compatible we should do a path
288	* search for the file, which is necessary to find sub-commands.
289	*/
290
291
292	STATIC char *
293	find_dot_file(char *basename)
294	{
295	char *fullname;
296	const char *path = pathval();
297	struct stat statb;
298
299	/* don't try this for absolute or relative paths */
300	if (strchr(basename, '/'))
301	return basename;
302
303	while ((fullname = padvance(&path, basename)) != NULL) {
304	if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
305	/*
306	* Don't bother freeing here, since it will
307	* be freed by the caller.
308	*/
309	return fullname;
310	}
311	stunalloc(fullname);
312	}
313
314	/* not found in the PATH */
315	sh_error("%s: not found", basename);
316	/* NOTREACHED */
317	}
318
319	int
320	dotcmd(int argc, char **argv)
321	{
322	int status = 0;
323
324	if (argc >= 2) { /* That's what SVR2 does */
325	char *fullname;
326
327	fullname = find_dot_file(argv[1]);
328	setinputfile(fullname, INPUT_PUSH_FILE);
329	commandname = fullname;
330	cmdloop(0);
331	popfile();
332	status = exitstatus;
333	}
334	return status;
335	}
336
337
338	int
339	exitcmd(int argc, char **argv)
340	{
341	if (stoppedjobs())
342	return 0;
343	if (argc > 1)
344	exitstatus = number(argv[1]);
345	exraise(EXEXIT);
346	/* NOTREACHED */
347	}