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/* $OpenBSD: uthread_execve.c,v 1.12 2010/07/13 03:10:29 guenther Exp $ */
/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* 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 John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 AUTHOR 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.
*
* $FreeBSD: uthread_execve.c,v 1.8 1999/08/28 00:03:30 peter Exp $
*/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
int
execve(const char *name, char *const * argv, char *const * envp)
{
struct pthread *curthread = _get_curthread();
int flags;
int i;
int ret;
int err;
struct sigaction act;
struct itimerval itimer;
struct itimerval oitimer;
sigset_t oset;
/* Disable the interval timer: */
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = 0;
itimer.it_value.tv_sec = 0;
itimer.it_value.tv_usec = 0;
setitimer(_ITIMER_SCHED_TIMER, &itimer, &oitimer);
/*
* Enter a loop to set all file descriptors to blocking
* if they were not created as non-blocking:
*/
for (i = 0; i < _thread_max_fdtsize; i++) {
/* Check if this file descriptor is in use: */
if (_thread_fd_table[i] != NULL &&
_thread_fd_table[i]->status_flags != NULL &&
!(_thread_fd_table[i]->status_flags->flags & O_NONBLOCK)) {
/* Skip if the close-on-exec flag is set */
flags = _thread_sys_fcntl(i, F_GETFD, NULL);
if ((flags & FD_CLOEXEC) != 0)
continue; /* don't bother, no point */
/* Get the current flags: */
flags = _thread_sys_fcntl(i, F_GETFL, NULL);
/* Clear the nonblocking file descriptor flag: */
_thread_sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
}
}
#define RESET_SIGNAL(sig) \
(_thread_sigact[(sig) - 1].sa_handler == SIG_IGN && \
_thread_sys_sigaction((sig), &_thread_sigact[(sig) - 1], NULL) != 0)
/* Reset the behavior for the signals that the library uses */
if (RESET_SIGNAL(_SCHED_SIGNAL) ||
RESET_SIGNAL(SIGINFO) ||
RESET_SIGNAL(SIGCHLD))
PANIC("Cannot reset signal handlers");
/* Set the signal mask: */
_thread_sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, &oset);
/* Execute the process: */
ret = _thread_sys_execve(name, argv, envp);
err = errno;
/* execve failed; try to restore the state the thread library needs */
#define REINIT_SIGNAL(sig) \
(_thread_sigact[(sig) - 1].sa_handler == SIG_IGN && \
_thread_sys_sigaction((sig), &act, NULL) != 0)
_thread_sys_sigprocmask(SIG_SETMASK, &oset, NULL);
sigfillset(&act.sa_mask);
act.sa_handler = (void (*) (int)) _thread_sig_handler;
act.sa_flags = SA_SIGINFO;
if (REINIT_SIGNAL(_SCHED_SIGNAL) ||
REINIT_SIGNAL(SIGINFO) ||
REINIT_SIGNAL(SIGCHLD))
PANIC("Cannot reinitialize signal handlers");
_thread_nonblock_fds();
setitimer(_ITIMER_SCHED_TIMER, &oitimer, NULL);
/* Return the completion status: */
errno = err;
return (ret);
}
#endif
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