Annotation of prex-old/usr/lib/posix/process/waitpid.c, Revision 1.1.1.1
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: }
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