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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/gen/popen.c	Lines:	0	63	0.0 %
Date:	2017-11-07	Branches:	0	61	0.0 %


/*	$OpenBSD: popen.c,v 1.21 2015/08/31 02:53:57 guenther Exp $ */
/*
 * Copyright (c) 1988, 1993
 *	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, 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 <sys/wait.h>

#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include <wchar.h>
#include "thread_private.h"

static struct pid {
	struct pid *next;
	FILE *fp;
	pid_t pid;
} *pidlist;

static void *pidlist_lock = NULL;

FILE *
popen(const char *program, const char *type)
{
	struct pid * volatile cur;
	FILE *iop;
	int pdes[2];
	int target;
	pid_t pid;

	if ((*type != 'r' && *type != 'w') ||
	    (type[1] != '\0' && (type[1] != 'e' || type[2] != '\0'))) {
		errno = EINVAL;
		return (NULL);
	}

	if ((cur = malloc(sizeof(struct pid))) == NULL)
		return (NULL);

	if (pipe2(pdes, O_CLOEXEC) < 0) {
		free(cur);
		return (NULL);
	}

	_MUTEX_LOCK(&pidlist_lock);
	switch (pid = vfork()) {
	case -1:			/* Error. */
		_MUTEX_UNLOCK(&pidlist_lock);
		(void)close(pdes[0]);
		(void)close(pdes[1]);
		free(cur);
		return (NULL);
		/* NOTREACHED */
	case 0:				/* Child. */
	    {
		struct pid *pcur;

		/*
		 * because vfork() instead of fork(), must leak FILE *,
		 * but luckily we are terminally headed for an execl()
		 */
		for (pcur = pidlist; pcur; pcur = pcur->next)
			close(fileno(pcur->fp));

		target = *type == 'r';
		if (pdes[target] != target) {
			if (dup2(pdes[target], target) == -1)
				_exit(127);
		} else {
			int flags = fcntl(pdes[target], F_GETFD);
			if (flags == -1 || ((flags & FD_CLOEXEC) &&
			    fcntl(pdes[target], F_SETFD, flags & ~FD_CLOEXEC)
			    == -1))
				_exit(127);
		}

		execl(_PATH_BSHELL, "sh", "-c", program, (char *)NULL);
		_exit(127);
		/* NOTREACHED */
	    }
	}
	_MUTEX_UNLOCK(&pidlist_lock);

	/* Parent; assume fdopen can't fail. */
	target = *type == 'w';
	iop = fdopen(pdes[target], type);
	fwide(iop, -1);
	(void)close(pdes[!target]);

	/* Link into list of file descriptors. */
	cur->fp = iop;
	cur->pid =  pid;
	_MUTEX_LOCK(&pidlist_lock);
	cur->next = pidlist;
	pidlist = cur;
	_MUTEX_UNLOCK(&pidlist_lock);

	/* now that it's in the list, clear FD_CLOEXEC if unwanted */
	if (type[1] != 'e') {
		int flags = fcntl(pdes[target], F_GETFD);
		if (flags != -1)
			fcntl(pdes[target], F_SETFD, flags & ~FD_CLOEXEC);
	}

	return (iop);
}
DEF_WEAK(popen);

/*
 * pclose --
 *	Pclose returns -1 if stream is not associated with a `popened' command,
 *	if already `pclosed', or waitpid returns an error.
 */
int
pclose(FILE *iop)
{
	struct pid *cur, *last;
	int pstat;
	pid_t pid;

	/* Find the appropriate file pointer. */
	_MUTEX_LOCK(&pidlist_lock);
	for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
		if (cur->fp == iop)
			break;

	if (cur == NULL) {
		_MUTEX_UNLOCK(&pidlist_lock);
		return (-1);
	}

	/* Remove the entry from the linked list. */
	if (last == NULL)
		pidlist = cur->next;
	else
		last->next = cur->next;
	_MUTEX_UNLOCK(&pidlist_lock);

	(void)fclose(iop);

	do {
		pid = waitpid(cur->pid, &pstat, 0);
	} while (pid == -1 && errno == EINTR);

	free(cur);

	return (pid == -1 ? -1 : pstat);
}
DEF_WEAK(pclose);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: popen.c,v 1.21 2015/08/31 02:53:57 guenther Exp $ */
2			/*
3			* Copyright (c) 1988, 1993
4			* The Regents of the University of California. All rights reserved.
5			*
6			* This code is derived from software written by Ken Arnold and
7			* published in UNIX Review, Vol. 6, No. 8.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			* 2. Redistributions in binary form must reproduce the above copyright
15			* notice, this list of conditions and the following disclaimer in the
16			* documentation and/or other materials provided with the distribution.
17			* 3. Neither the name of the University nor the names of its contributors
18			* may be used to endorse or promote products derived from this software
19			* without specific prior written permission.
20			*
21			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31			* SUCH DAMAGE.
32			*/
33
34			#include <sys/wait.h>
35
36			#include <signal.h>
37			#include <errno.h>
38			#include <fcntl.h>
39			#include <unistd.h>
40			#include <stdio.h>
41			#include <stdlib.h>
42			#include <string.h>
43			#include <paths.h>
44			#include <wchar.h>
45			#include "thread_private.h"
46
47			static struct pid {
48			struct pid *next;
49			FILE *fp;
50			pid_t pid;
51			} *pidlist;
52
53			static void *pidlist_lock = NULL;
54
55			FILE *
56			popen(const char program, const char type)
57			{
58			struct pid * volatile cur;
59			FILE *iop;
60			int pdes[2];
61			int target;
62			pid_t pid;
63
64			if ((type != 'r' && type != 'w') \|\|
65			(type[1] != '\0' && (type[1] != 'e' \|\| type[2] != '\0'))) {
66			errno = EINVAL;
67			return (NULL);
68			}
69
70			if ((cur = malloc(sizeof(struct pid))) == NULL)
71			return (NULL);
72
73			if (pipe2(pdes, O_CLOEXEC) < 0) {
74			free(cur);
75			return (NULL);
76			}
77
78			_MUTEX_LOCK(&pidlist_lock);
79			switch (pid = vfork()) {
80			case -1: /* Error. */
81			_MUTEX_UNLOCK(&pidlist_lock);
82			(void)close(pdes[0]);
83			(void)close(pdes[1]);
84			free(cur);
85			return (NULL);
86			/* NOTREACHED */
87			case 0: /* Child. */
88			{
89			struct pid *pcur;
90
91			/*
92			* because vfork() instead of fork(), must leak FILE *,
93			* but luckily we are terminally headed for an execl()
94			*/
95			for (pcur = pidlist; pcur; pcur = pcur->next)
96			close(fileno(pcur->fp));
97
98			target = *type == 'r';
99			if (pdes[target] != target) {
100			if (dup2(pdes[target], target) == -1)
101			_exit(127);
102			} else {
103			int flags = fcntl(pdes[target], F_GETFD);
104			if (flags == -1 \|\| ((flags & FD_CLOEXEC) &&
105			fcntl(pdes[target], F_SETFD, flags & ~FD_CLOEXEC)
106			== -1))
107			_exit(127);
108			}
109
110			execl(_PATH_BSHELL, "sh", "-c", program, (char *)NULL);
111			_exit(127);
112			/* NOTREACHED */
113			}
114			}
115			_MUTEX_UNLOCK(&pidlist_lock);
116
117			/* Parent; assume fdopen can't fail. */
118			target = *type == 'w';
119			iop = fdopen(pdes[target], type);
120			fwide(iop, -1);
121			(void)close(pdes[!target]);
122
123			/* Link into list of file descriptors. */
124			cur->fp = iop;
125			cur->pid = pid;
126			_MUTEX_LOCK(&pidlist_lock);
127			cur->next = pidlist;
128			pidlist = cur;
129			_MUTEX_UNLOCK(&pidlist_lock);
130
131			/* now that it's in the list, clear FD_CLOEXEC if unwanted */
132			if (type[1] != 'e') {
133			int flags = fcntl(pdes[target], F_GETFD);
134			if (flags != -1)
135			fcntl(pdes[target], F_SETFD, flags & ~FD_CLOEXEC);
136			}
137
138			return (iop);
139			}
140			DEF_WEAK(popen);
141
142			/*
143			* pclose --
144			* Pclose returns -1 if stream is not associated with a `popened' command,
145			* if already `pclosed', or waitpid returns an error.
146			*/
147			int
148			pclose(FILE *iop)
149			{
150			struct pid cur, last;
151			int pstat;
152			pid_t pid;
153
154			/* Find the appropriate file pointer. */
155			_MUTEX_LOCK(&pidlist_lock);
156			for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
157			if (cur->fp == iop)
158			break;
159
160			if (cur == NULL) {
161			_MUTEX_UNLOCK(&pidlist_lock);
162			return (-1);
163			}
164
165			/* Remove the entry from the linked list. */
166			if (last == NULL)
167			pidlist = cur->next;
168			else
169			last->next = cur->next;
170			_MUTEX_UNLOCK(&pidlist_lock);
171
172			(void)fclose(iop);
173
174			do {
175			pid = waitpid(cur->pid, &pstat, 0);
176			} while (pid == -1 && errno == EINTR);
177
178			free(cur);
179
180			return (pid == -1 ? -1 : pstat);
181			}
182			DEF_WEAK(pclose);