1 /* $OpenBSD: uthread_execve.c,v 1.7 2003/10/22 00:24:14 brad Exp $ */
2 /*
3 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by John Birrell.
17 * 4. Neither the name of the author nor the names of any co-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 JOHN BIRRELL 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 AUTHOR 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 * $FreeBSD: uthread_execve.c,v 1.8 1999/08/28 00:03:30 peter Exp $
34 */
35 #include <errno.h>
36 #include <fcntl.h>
37 #include <unistd.h>
38 #ifdef _THREAD_SAFE
39 #include <pthread.h>
40 #include "pthread_private.h"
41
42 int
execve(const char * name,char * const * argv,char * const * envp)43 execve(const char *name, char *const * argv, char *const * envp)
44 {
45 struct pthread *curthread = _get_curthread();
46 int flags;
47 int i;
48 int ret;
49 struct sigaction act;
50 struct sigaction oact;
51 struct itimerval itimer;
52
53 /* Disable the interval timer: */
54 itimer.it_interval.tv_sec = 0;
55 itimer.it_interval.tv_usec = 0;
56 itimer.it_value.tv_sec = 0;
57 itimer.it_value.tv_usec = 0;
58 setitimer(_ITIMER_SCHED_TIMER, &itimer, NULL);
59
60 /* Close the pthread kernel pipe: */
61 _thread_sys_close(_thread_kern_pipe[0]);
62 _thread_sys_close(_thread_kern_pipe[1]);
63
64 /*
65 * Enter a loop to set all file descriptors to blocking
66 * if they were not created as non-blocking:
67 */
68 for (i = 0; i < _thread_dtablesize; i++) {
69 /* Check if this file descriptor is in use: */
70 if (_thread_fd_table[i] != NULL &&
71 !(_thread_fd_table[i]->flags & O_NONBLOCK)) {
72 /* Skip if the close-on-exec flag is set */
73 flags = _thread_sys_fcntl(i, F_GETFD, NULL);
74 if ((flags & FD_CLOEXEC) != 0)
75 continue; /* don't bother, no point */
76 /* Get the current flags: */
77 flags = _thread_sys_fcntl(i, F_GETFL, NULL);
78 /* Clear the nonblocking file descriptor flag: */
79 _thread_sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
80 }
81 }
82
83 /* Enter a loop to adopt the signal actions for the running thread: */
84 for (i = 1; i < NSIG; i++) {
85 /* Check for signals which cannot be caught: */
86 if (i == SIGKILL || i == SIGSTOP) {
87 /* Don't do anything with these signals. */
88 } else {
89 /* Check if ignoring this signal: */
90 if (_thread_sigact[i - 1].sa_handler == SIG_IGN) {
91 /* Continue to ignore this signal: */
92 act.sa_handler = SIG_IGN;
93 } else {
94 /* Use the default handler for this signal: */
95 act.sa_handler = SIG_DFL;
96 }
97
98 /* Copy the mask and flags for this signal: */
99 act.sa_mask = _thread_sigact[i - 1].sa_mask;
100 act.sa_flags = _thread_sigact[i - 1].sa_flags;
101
102 /* Ensure the scheduling signal is masked: */
103 sigaddset(&act.sa_mask, _SCHED_SIGNAL);
104
105 /* Change the signal action for the process: */
106 _thread_sys_sigaction(i, &act, &oact);
107 }
108 }
109
110 /* Set the signal mask: */
111 _thread_sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL);
112
113 /* Execute the process: */
114 ret = _thread_sys_execve(name, argv, envp);
115
116 /* Return the completion status: */
117 return (ret);
118 }
119 #endif
120