Annotation of prex-old/usr/lib/posix/process/waitpid.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <prex/prex.h>
! 31: #include <prex/posix.h>
! 32: #include <server/proc.h>
! 33: #include <server/stdmsg.h>
! 34: #include <sys/wait.h>
! 35:
! 36: #include <stddef.h>
! 37: #include <errno.h>
! 38:
! 39: /*
! 40: * If the target child task calls exit() just after we
! 41: * send PS_WAITPID message, a process server will send an
! 42: * exception to us. But, we can not catch the exception
! 43: * before calling exception_wait().
! 44: */
! 45: pid_t
! 46: waitpid(pid_t pid, int *status, int options)
! 47: {
! 48: struct msg m;
! 49: pid_t child;
! 50: int sig, err;
! 51: thread_t self;
! 52: int prio;
! 53:
! 54: /* Boost current priority */
! 55: self = thread_self();
! 56: thread_getprio(self, &prio);
! 57: thread_setprio(self, prio - 1);
! 58:
! 59: for (;;) {
! 60: m.hdr.code = PS_WAITPID;
! 61: m.data[0] = pid;
! 62: m.data[1] = options;
! 63: err = msg_send(__proc_obj, &m, sizeof(m));
! 64: if (err == EINTR)
! 65: continue;
! 66:
! 67: if (m.hdr.status) {
! 68: errno = m.hdr.status;
! 69: return -1;
! 70: }
! 71: child = m.data[0];
! 72: if (child != 0 || options & WNOHANG)
! 73: break;
! 74:
! 75: err = exception_wait(&sig);
! 76: if (err == EINTR) {
! 77: errno = EINTR;
! 78: break;
! 79: }
! 80: }
! 81: /* Restore priority */
! 82: thread_setprio(self, prio);
! 83:
! 84: *status = m.data[1];
! 85: return child;
! 86: }
CVSweb