diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_wait4.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_wait4.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_wait4.c b/lib/libc_r/uthread/uthread_wait4.c new file mode 100644 index 000000000000..0a721af4fda9 --- /dev/null +++ b/lib/libc_r/uthread/uthread_wait4.c @@ -0,0 +1,61 @@ +/* + * Copyright (c) 1995 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 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 <errno.h> +#include <sys/wait.h> +#ifdef _THREAD_SAFE +#include <pthread.h> +#include "pthread_private.h" + +pid_t +wait4(pid_t pid, int *istat, int options, struct rusage * rusage) +{ + int status; + pid_t ret; + _thread_kern_sig_block(&status); + + /* Perform a non-blocking wait4 syscall: */ + while ((ret = _thread_sys_wait4(pid, istat, options | WNOHANG, rusage)) == 0 && (options & WNOHANG) == 0) { + /* Schedule the next thread while this one waits: */ + _thread_kern_sched_state(PS_WAIT_WAIT, __FILE__, __LINE__); + + /* Check if this call was interrupted by a signal: */ + if (errno == EINTR) { + ret = -1; + break; + } + _thread_kern_sig_block(NULL); + } + _thread_kern_sig_unblock(status); + return (ret); +} +#endif |