--- /dev/null
+/*
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 5/3/95";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/gen/popen.c,v 1.18 2003/01/04 00:15:15 tjr Exp $");
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <sys/wait.h>
+
+#include <signal.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <paths.h>
+#include <pthread.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+
+extern char **environ;
+
+static struct pid {
+ struct pid *next;
+ FILE *fp;
+ pid_t pid;
+} *pidlist;
+static pthread_mutex_t pidlist_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+#define THREAD_LOCK() if (__isthreaded) _pthread_mutex_lock(&pidlist_mutex)
+#define THREAD_UNLOCK() if (__isthreaded) _pthread_mutex_unlock(&pidlist_mutex)
+
+FILE *
+popen(command, type)
+ const char *command, *type;
+{
+ struct pid *cur;
+ FILE *iop;
+ int pdes[2], pid, twoway;
+ char *argv[4];
+ struct pid *p;
+
+ /*
+ * Lite2 introduced two-way popen() pipes using _socketpair().
+ * FreeBSD's pipe() is bidirectional, so we use that.
+ */
+ if (strchr(type, '+')) {
+ twoway = 1;
+ type = "r+";
+ } else {
+ twoway = 0;
+ if ((*type != 'r' && *type != 'w') || type[1])
+ return (NULL);
+ }
+ if (pipe(pdes) < 0)
+ return (NULL);
+
+ if ((cur = malloc(sizeof(struct pid))) == NULL) {
+ (void)_close(pdes[0]);
+ (void)_close(pdes[1]);
+ return (NULL);
+ }
+
+ argv[0] = "sh";
+ argv[1] = "-c";
+ argv[2] = (char *)command;
+ argv[3] = NULL;
+
+ THREAD_LOCK();
+ switch (pid = vfork()) {
+ case -1: /* Error. */
+ THREAD_UNLOCK();
+ (void)_close(pdes[0]);
+ (void)_close(pdes[1]);
+ free(cur);
+ return (NULL);
+ /* NOTREACHED */
+ case 0: /* Child. */
+ if (*type == 'r') {
+ /*
+ * The _dup2() to STDIN_FILENO is repeated to avoid
+ * writing to pdes[1], which might corrupt the
+ * parent's copy. This isn't good enough in
+ * general, since the _exit() is no return, so
+ * the compiler is free to corrupt all the local
+ * variables.
+ */
+ (void)_close(pdes[0]);
+ if (pdes[1] != STDOUT_FILENO) {
+ (void)_dup2(pdes[1], STDOUT_FILENO);
+ (void)_close(pdes[1]);
+ if (twoway)
+ (void)_dup2(STDOUT_FILENO, STDIN_FILENO);
+ } else if (twoway && (pdes[1] != STDIN_FILENO))
+ (void)_dup2(pdes[1], STDIN_FILENO);
+ } else {
+ if (pdes[0] != STDIN_FILENO) {
+ (void)_dup2(pdes[0], STDIN_FILENO);
+ (void)_close(pdes[0]);
+ }
+ (void)_close(pdes[1]);
+ }
+ for (p = pidlist; p; p = p->next) {
+ (void)_close(fileno(p->fp));
+ }
+ _execve(_PATH_BSHELL, argv, environ);
+ _exit(127);
+ /* NOTREACHED */
+ }
+ THREAD_UNLOCK();
+
+ /* 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]);
+ }
+
+ /* Link into list of file descriptors. */
+ cur->fp = iop;
+ cur->pid = pid;
+ THREAD_LOCK();
+ cur->next = pidlist;
+ pidlist = cur;
+ THREAD_UNLOCK();
+
+ return (iop);
+}
+
+/*
+ * pclose --
+ * Pclose returns -1 if stream is not associated with a `popened' command,
+ * if already `pclosed', or waitpid returns an error.
+ */
+int
+pclose(iop)
+ FILE *iop;
+{
+ struct pid *cur, *last;
+ int pstat;
+ pid_t pid;
+
+ /*
+ * Find the appropriate file pointer and remove it from the list.
+ */
+ THREAD_LOCK();
+ for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next)
+ if (cur->fp == iop)
+ break;
+ if (cur == NULL) {
+ THREAD_UNLOCK();
+ return (-1);
+ }
+ if (last == NULL)
+ pidlist = cur->next;
+ else
+ last->next = cur->next;
+ THREAD_UNLOCK();
+
+ (void)fclose(iop);
+
+ do {
+ pid = _wait4(cur->pid, &pstat, 0, (struct rusage *)0);
+ } while (pid == -1 && errno == EINTR);
+
+ free(cur);
+
+ return (pid == -1 ? -1 : pstat);
+}
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