Annotation of prex/usr/lib/posix/signal/sigaction.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/signal.h>
31:
32: #include <stddef.h>
33: #include <signal.h>
34: #include <errno.h>
35:
36: /*
37: * If act is not NULL, set the action for signum.
38: * If oact is not NULL. store the old action to oact.
39: */
40: int
41: sigaction(int signum, const struct sigaction *act, struct sigaction *oact)
42: {
43: struct sigaction *sa;
44:
45: if (signum <= 0 || signum >= NSIG ||
46: signum == SIGSTOP || signum == SIGKILL) {
47: errno = EINVAL;
48: return -1;
49: }
50:
51: SIGNAL_LOCK();
52:
53: sa = &__sig_act[signum];
54:
55: if (oact != NULL)
56: *oact = *sa;
57:
58: if (act != NULL)
59: *sa = *act;
60:
61: /* Discard pending signal in some cases */
62: if (sa->sa_handler == SIG_IGN ||
63: (sa->sa_handler == SIG_DFL && signum == SIGCHLD))
64: __sig_pending &= ~sigmask(signum);
65:
66: SIGNAL_UNLOCK();
67:
68: /* Process pending signal */
69: __sig_flush();
70:
71: return 0;
72: }
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