[unix-history] / usr.sbin / cron / popen.c

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software written by Ken Arnold and
 * published in UNIX Review, Vol. 6, No. 8.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * From Id: popen.c,v 1.5 1994/01/15 20:43:43 vixie Exp
 */

/* this came out of the ftpd sources; it's been modified to avoid the
 * globbing stuff since we don't need it.  also execvp instead of execv.
 */

#ifndef lint
static char rcsid[] = "$Header: $";
static char sccsid[] = "@(#)popen.c	5.7 (Berkeley) 2/14/89";
#endif /* not lint */

#include "cron.h"
#include <sys/signal.h>


#define WANT_GLOBBING 0

/*
 * Special version of popen which avoids call to shell.  This insures noone
 * may create a pipe to a hidden program as a side effect of a list or dir
 * command.
 */
static PID_T *pids;
static int fds;

FILE *
cron_popen(program, type)
	char *program, *type;
{
	register char *cp;
	FILE *iop;
	int argc, pdes[2];
	PID_T pid;
	char *argv[100];
#if WANT_GLOBBING
	char **pop, *vv[2];
	int gargc;
	char *gargv[1000];
	extern char **glob(), **copyblk();
#endif

	if (*type != 'r' && *type != 'w' || type[1])
		return(NULL);

	if (!pids) {
		if ((fds = getdtablesize()) <= 0)
			return(NULL);
		if (!(pids = (PID_T *)malloc((u_int)(fds * sizeof(PID_T)))))
			return(NULL);
		bzero((char *)pids, fds * sizeof(PID_T));
	}
	if (pipe(pdes) < 0)
		return(NULL);

	/* break up string into pieces */
	for (argc = 0, cp = program;; cp = NULL)
		if (!(argv[argc++] = strtok(cp, " \t\n")))
			break;

#if WANT_GLOBBING
	/* glob each piece */
	gargv[0] = argv[0];
	for (gargc = argc = 1; argv[argc]; argc++) {
		if (!(pop = glob(argv[argc]))) {	/* globbing failed */
			vv[0] = argv[argc];
			vv[1] = NULL;
			pop = copyblk(vv);
		}
		argv[argc] = (char *)pop;		/* save to free later */
		while (*pop && gargc < 1000)
			gargv[gargc++] = *pop++;
	}
	gargv[gargc] = NULL;
#endif

	iop = NULL;
	switch(pid = vfork()) {
	case -1:			/* error */
		(void)close(pdes[0]);
		(void)close(pdes[1]);
		goto pfree;
		/* NOTREACHED */
	case 0:				/* child */
		if (*type == 'r') {
			if (pdes[1] != 1) {
				dup2(pdes[1], 1);
				dup2(pdes[1], 2);	/* stderr, too! */
				(void)close(pdes[1]);
			}
			(void)close(pdes[0]);
		} else {
			if (pdes[0] != 0) {
				dup2(pdes[0], 0);
				(void)close(pdes[0]);
			}
			(void)close(pdes[1]);
		}
#if WANT_GLOBBING
		execvp(gargv[0], gargv);
#else
		execvp(argv[0], argv);
#endif
		_exit(1);
	}
	/* parent; assume fdopen can't fail...  */
	if (*type == 'r') {
		iop = fdopen(pdes[0], type);
		(void)close(pdes[1]);
	} else {
		iop = fdopen(pdes[1], type);
		(void)close(pdes[0]);
	}
	pids[fileno(iop)] = pid;

pfree:
#if WANT_GLOBBING
	for (argc = 1; argv[argc] != NULL; argc++) {
/*		blkfree((char **)argv[argc]);	*/
		free((char *)argv[argc]);
	}
#endif
	return(iop);
}

int
cron_pclose(iop)
	FILE *iop;
{
	register int fdes;
	int omask;
	WAIT_T stat_loc;
	PID_T pid;

	/*
	 * pclose returns -1 if stream is not associated with a
	 * `popened' command, or, if already `pclosed'.
	 */
	if (pids == 0 || pids[fdes = fileno(iop)] == 0)
		return(-1);
	(void)fclose(iop);
	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
	while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
		;
	(void)sigsetmask(omask);
	pids[fdes] = 0;
	return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
}
Commit	Line	Data
693d8207 GR	1	/*
	2	* Copyright (c) 1988 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software written by Ken Arnold and
	6	* published in UNIX Review, Vol. 6, No. 8.
	7	*
	8	* Redistribution and use in source and binary forms are permitted
	9	* provided that the above copyright notice and this paragraph are
	10	* duplicated in all such forms and that any documentation,
	11	* advertising materials, and other materials related to such
	12	* distribution and use acknowledge that the software was developed
	13	* by the University of California, Berkeley. The name of the
	14	* University may not be used to endorse or promote products derived
	15	* from this software without specific prior written permission.
	16	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	17	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	18	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	19	*
	20	* From Id: popen.c,v 1.5 1994/01/15 20:43:43 vixie Exp
	21	*/
	22
	23	/* this came out of the ftpd sources; it's been modified to avoid the
	24	* globbing stuff since we don't need it. also execvp instead of execv.
	25	*/
	26
	27	#ifndef lint
	28	static char rcsid[] = "$Header: $";
	29	static char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89";
	30	#endif /* not lint */
	31
	32	#include "cron.h"
	33	#include <sys/signal.h>
	34
	35
	36	#define WANT_GLOBBING 0
	37
	38	/*
	39	* Special version of popen which avoids call to shell. This insures noone
	40	* may create a pipe to a hidden program as a side effect of a list or dir
	41	* command.
	42	*/
	43	static PID_T *pids;
	44	static int fds;
	45
	46	FILE *
	47	cron_popen(program, type)
	48	char program, type;
	49	{
	50	register char *cp;
	51	FILE *iop;
	52	int argc, pdes[2];
	53	PID_T pid;
	54	char *argv[100];
	55	#if WANT_GLOBBING
	56	char *pop, vv[2];
	57	int gargc;
	58	char *gargv[1000];
	59	extern char glob(), copyblk();
	60	#endif
	61
	62	if (type != 'r' && type != 'w' \|\| type[1])
	63	return(NULL);
	64
65	if (!pids) {
66	if ((fds = getdtablesize()) <= 0)
67	return(NULL);
68	if (!(pids = (PID_T )malloc((u_int)(fds sizeof(PID_T)))))
69	return(NULL);
70	bzero((char )pids, fds sizeof(PID_T));
71	}
72	if (pipe(pdes) < 0)
73	return(NULL);
74
75	/* break up string into pieces */
76	for (argc = 0, cp = program;; cp = NULL)
77	if (!(argv[argc++] = strtok(cp, " \t\n")))
78	break;
79
80	#if WANT_GLOBBING
81	/* glob each piece */
82	gargv[0] = argv[0];
83	for (gargc = argc = 1; argv[argc]; argc++) {
84	if (!(pop = glob(argv[argc]))) { /* globbing failed */
85	vv[0] = argv[argc];
86	vv[1] = NULL;
87	pop = copyblk(vv);
88	}
89	argv[argc] = (char )pop; / save to free later */
90	while (*pop && gargc < 1000)
91	gargv[gargc++] = *pop++;
92	}
93	gargv[gargc] = NULL;
94	#endif
95
96	iop = NULL;
97	switch(pid = vfork()) {
98	case -1: /* error */
99	(void)close(pdes[0]);
100	(void)close(pdes[1]);
101	goto pfree;
102	/* NOTREACHED */
103	case 0: /* child */
104	if (*type == 'r') {
105	if (pdes[1] != 1) {
106	dup2(pdes[1], 1);
107	dup2(pdes[1], 2); /* stderr, too! */
108	(void)close(pdes[1]);
109	}
110	(void)close(pdes[0]);
111	} else {
112	if (pdes[0] != 0) {
113	dup2(pdes[0], 0);
114	(void)close(pdes[0]);
115	}
116	(void)close(pdes[1]);
117	}
118	#if WANT_GLOBBING
119	execvp(gargv[0], gargv);
120	#else
121	execvp(argv[0], argv);
122	#endif
123	_exit(1);
124	}
125	/* parent; assume fdopen can't fail... */
126	if (*type == 'r') {
127	iop = fdopen(pdes[0], type);
128	(void)close(pdes[1]);
129	} else {
130	iop = fdopen(pdes[1], type);
131	(void)close(pdes[0]);
132	}
133	pids[fileno(iop)] = pid;
134
135	pfree:
136	#if WANT_GLOBBING
137	for (argc = 1; argv[argc] != NULL; argc++) {
138	/* blkfree((char *)argv[argc]); /
139	free((char *)argv[argc]);
140	}
141	#endif
142	return(iop);
143	}
144
145	int
146	cron_pclose(iop)
147	FILE *iop;
148	{
149	register int fdes;
150	int omask;
151	WAIT_T stat_loc;
152	PID_T pid;
153
154	/*
155	* pclose returns -1 if stream is not associated with a
156	* `popened' command, or, if already `pclosed'.
157	*/
158	if (pids == 0 \|\| pids[fdes = fileno(iop)] == 0)
159	return(-1);
160	(void)fclose(iop);
161	omask = sigblock(sigmask(SIGINT)\|sigmask(SIGQUIT)\|sigmask(SIGHUP));
162	while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
163	;
164	(void)sigsetmask(omask);
165	pids[fdes] = 0;
166	return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
167	}