version 1.6, 1993/11/11 19:04:30 |
version 1.34, 2015/01/20 18:31:25 |
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/* $NetBSD$ */ |
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/* |
/* |
* Copyright (c) 1988 The Regents of the University of California. |
* Copyright (c) 1988, 1993 |
* All rights reserved. |
* The Regents of the University of California. All rights reserved. |
* |
* |
* This code is derived from software written by Ken Arnold and |
* This code is derived from software written by Ken Arnold and |
* published in UNIX Review, Vol. 6, No. 8. |
* published in UNIX Review, Vol. 6, No. 8. |
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* 2. Redistributions in binary form must reproduce the above copyright |
* 2. Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* documentation and/or other materials provided with the distribution. |
* 3. All advertising materials mentioning features or use of this software |
* 3. Neither the name of the University nor the names of its contributors |
* must display the following acknowledgement: |
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* This product includes software developed by the University of |
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* California, Berkeley and its contributors. |
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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
* may be used to endorse or promote products derived from this software |
* without specific prior written permission. |
* without specific prior written permission. |
* |
* |
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* SUCH DAMAGE. |
* SUCH DAMAGE. |
*/ |
*/ |
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#include <sys/cdefs.h> |
#if defined(LIBC_SCCS) && !defined(lint) |
#if defined(LIBC_SCCS) && !defined(lint) |
/*static char *sccsid = "from: @(#)popen.c 5.15 (Berkeley) 2/23/91";*/ |
#if 0 |
static char *rcsid = "$Id$"; |
static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 5/3/95"; |
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#else |
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__RCSID("$NetBSD$"); |
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#endif |
#endif /* LIBC_SCCS and not lint */ |
#endif /* LIBC_SCCS and not lint */ |
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#include "namespace.h" |
#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/wait.h> |
#include <sys/wait.h> |
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#include <sys/socket.h> |
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#include <assert.h> |
#include <errno.h> |
#include <errno.h> |
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#include <paths.h> |
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#include <signal.h> |
#include <stdio.h> |
#include <stdio.h> |
#include <stdlib.h> |
#include <stdlib.h> |
#include <string.h> |
#include <string.h> |
#include <unistd.h> |
#include <unistd.h> |
#include <paths.h> |
#include <fcntl.h> |
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static pid_t *pids; |
#include "env.h" |
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FILE * |
#ifdef __weak_alias |
popen(command, type) |
__weak_alias(popen,_popen) |
const char *command; |
__weak_alias(pclose,_pclose) |
const char *type; |
#endif |
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static struct pid { |
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struct pid *next; |
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FILE *fp; |
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#ifdef _REENTRANT |
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int fd; |
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#endif |
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pid_t pid; |
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} *pidlist; |
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#ifdef _REENTRANT |
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static rwlock_t pidlist_lock = RWLOCK_INITIALIZER; |
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#endif |
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static struct pid * |
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pdes_get(int *pdes, const char **type) |
{ |
{ |
FILE *iop; |
struct pid *cur; |
int pdes[2], fds, pid; |
int flags = strchr(*type, 'e') ? O_CLOEXEC : 0; |
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int serrno; |
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if (*type != 'r' && *type != 'w' || type[1]) { |
if (strchr(*type, '+')) { |
errno = EINVAL; |
int stype = flags ? (SOCK_STREAM | SOCK_CLOEXEC) : SOCK_STREAM; |
return (NULL); |
*type = "r+"; |
} |
if (socketpair(AF_LOCAL, stype, 0, pdes) < 0) |
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return NULL; |
if (pids == NULL) { |
} else { |
if ((fds = getdtablesize()) <= 0) |
*type = strrchr(*type, 'r') ? "r" : "w"; |
return (NULL); |
if (pipe2(pdes, flags) == -1) |
if ((pids = (pid_t *)malloc((u_int)(fds * sizeof(int)))) == NULL) |
return NULL; |
return (NULL); |
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bzero((char *)pids, fds * sizeof(pid_t)); |
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} |
} |
if (pipe(pdes) < 0) |
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return (NULL); |
if ((cur = malloc(sizeof(*cur))) != NULL) |
switch (pid = vfork()) { |
return cur; |
case -1: /* error */ |
serrno = errno; |
(void) close(pdes[0]); |
(void)close(pdes[0]); |
(void) close(pdes[1]); |
(void)close(pdes[1]); |
return (NULL); |
errno = serrno; |
/* NOTREACHED */ |
return NULL; |
case 0: /* child */ |
} |
if (*type == 'r') { |
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if (pdes[1] != STDOUT_FILENO) { |
static void |
(void) dup2(pdes[1], STDOUT_FILENO); |
pdes_child(int *pdes, const char *type) |
(void) close(pdes[1]); |
{ |
} |
struct pid *old; |
(void) close(pdes[0]); |
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} else { |
/* POSIX.2 B.3.2.2 "popen() shall ensure that any streams |
if (pdes[0] != STDIN_FILENO) { |
from previous popen() calls that remain open in the |
(void) dup2(pdes[0], STDIN_FILENO); |
parent process are closed in the new child process. */ |
(void) close(pdes[0]); |
for (old = pidlist; old; old = old->next) |
} |
#ifdef _REENTRANT |
(void) close(pdes[1]); |
(void)close(old->fd); /* don't allow a flush */ |
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#else |
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(void)close(fileno(old->fp)); /* don't allow a flush */ |
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#endif |
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if (type[0] == 'r') { |
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(void)close(pdes[0]); |
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if (pdes[1] != STDOUT_FILENO) { |
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(void)dup2(pdes[1], STDOUT_FILENO); |
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(void)close(pdes[1]); |
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} |
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if (type[1] == '+') |
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(void)dup2(STDOUT_FILENO, STDIN_FILENO); |
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} else { |
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(void)close(pdes[1]); |
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if (pdes[0] != STDIN_FILENO) { |
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(void)dup2(pdes[0], STDIN_FILENO); |
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(void)close(pdes[0]); |
} |
} |
execl(_PATH_BSHELL, "sh", "-c", command, (char *) 0); |
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_exit(127); |
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/* NOTREACHED */ |
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} |
} |
/* parent; assume fdopen can't fail... */ |
} |
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static void |
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pdes_parent(int *pdes, struct pid *cur, pid_t pid, const char *type) |
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{ |
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FILE *iop; |
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/* Parent; assume fdopen can't fail. */ |
if (*type == 'r') { |
if (*type == 'r') { |
iop = fdopen(pdes[0], type); |
iop = fdopen(pdes[0], type); |
(void) close(pdes[1]); |
#ifdef _REENTRANT |
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cur->fd = pdes[0]; |
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#endif |
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(void)close(pdes[1]); |
} else { |
} else { |
iop = fdopen(pdes[1], type); |
iop = fdopen(pdes[1], type); |
(void) close(pdes[0]); |
#ifdef _REENTRANT |
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cur->fd = pdes[1]; |
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#endif |
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(void)close(pdes[0]); |
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} |
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/* Link into list of file descriptors. */ |
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cur->fp = iop; |
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cur->pid = pid; |
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cur->next = pidlist; |
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pidlist = cur; |
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} |
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static void |
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pdes_error(int *pdes, struct pid *cur) |
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{ |
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free(cur); |
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(void)close(pdes[0]); |
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(void)close(pdes[1]); |
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} |
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FILE * |
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popen(const char *cmd, const char *type) |
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{ |
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struct pid *cur; |
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int pdes[2], serrno; |
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pid_t pid; |
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_DIAGASSERT(cmd != NULL); |
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_DIAGASSERT(type != NULL); |
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if ((cur = pdes_get(pdes, &type)) == NULL) |
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return NULL; |
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#ifdef _REENTRANT |
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(void)rwlock_rdlock(&pidlist_lock); |
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#endif |
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(void)__readlockenv(); |
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switch (pid = vfork()) { |
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case -1: /* Error. */ |
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serrno = errno; |
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(void)__unlockenv(); |
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#ifdef _REENTRANT |
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(void)rwlock_unlock(&pidlist_lock); |
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#endif |
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errno = serrno; |
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return NULL; |
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/* NOTREACHED */ |
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case 0: /* Child. */ |
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pdes_child(pdes, type); |
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execl(_PATH_BSHELL, "sh", "-c", cmd, NULL); |
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_exit(127); |
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/* NOTREACHED */ |
} |
} |
pids[fileno(iop)] = pid; |
(void)__unlockenv(); |
return (iop); |
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pdes_parent(pdes, cur, pid, type); |
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#ifdef _REENTRANT |
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(void)rwlock_unlock(&pidlist_lock); |
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#endif |
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return cur->fp; |
} |
} |
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FILE * |
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popenve(const char *cmd, char *const *argv, char *const *envp, const char *type) |
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{ |
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struct pid *cur; |
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int pdes[2], serrno; |
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pid_t pid; |
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_DIAGASSERT(cmd != NULL); |
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_DIAGASSERT(type != NULL); |
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if ((cur = pdes_get(pdes, &type)) == NULL) |
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return NULL; |
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#ifdef _REENTRANT |
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(void)rwlock_rdlock(&pidlist_lock); |
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#endif |
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switch (pid = vfork()) { |
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case -1: /* Error. */ |
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serrno = errno; |
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#ifdef _REENTRANT |
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(void)rwlock_unlock(&pidlist_lock); |
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#endif |
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pdes_error(pdes, cur); |
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errno = serrno; |
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return NULL; |
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/* NOTREACHED */ |
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case 0: /* Child. */ |
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pdes_child(pdes, type); |
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execve(cmd, argv, envp); |
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_exit(127); |
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/* NOTREACHED */ |
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} |
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pdes_parent(pdes, cur, pid, type); |
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#ifdef _REENTRANT |
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(void)rwlock_unlock(&pidlist_lock); |
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#endif |
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return cur->fp; |
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} |
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/* |
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* pclose -- |
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* Pclose returns -1 if stream is not associated with a `popened' command, |
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* if already `pclosed', or waitpid returns an error. |
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*/ |
int |
int |
pclose(iop) |
pclose(FILE *iop) |
FILE *iop; |
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{ |
{ |
register int fdes; |
struct pid *cur, *last; |
int pstat; |
int pstat; |
pid_t pid; |
pid_t pid; |
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/* |
_DIAGASSERT(iop != NULL); |
* pclose returns -1 if stream is not associated with a |
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* `popened' command, if already `pclosed', or waitpid |
#ifdef _REENTRANT |
* returns an error. |
rwlock_wrlock(&pidlist_lock); |
*/ |
#endif |
if (pids == NULL || pids[fdes = fileno(iop)] == 0) |
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return (-1); |
/* Find the appropriate file pointer. */ |
(void) fclose(iop); |
for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next) |
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if (cur->fp == iop) |
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break; |
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if (cur == NULL) { |
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#ifdef _REENTRANT |
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(void)rwlock_unlock(&pidlist_lock); |
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#endif |
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errno = ESRCH; |
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return -1; |
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} |
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(void)fclose(iop); |
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/* Remove the entry from the linked list. */ |
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if (last == NULL) |
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pidlist = cur->next; |
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else |
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last->next = cur->next; |
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#ifdef _REENTRANT |
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(void)rwlock_unlock(&pidlist_lock); |
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#endif |
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do { |
do { |
pid = waitpid(pids[fdes], &pstat, 0); |
pid = waitpid(cur->pid, &pstat, 0); |
} while (pid == -1 && errno == EINTR); |
} while (pid == -1 && errno == EINTR); |
pids[fdes] = 0; |
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return (pid == -1 ? -1 : pstat); |
free(cur); |
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return pid == -1 ? -1 : pstat; |
} |
} |