root / prex-0.9.0 / usr / lib / posix / signal / sigprocmask.c @ 03e9c04a
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| 1 | 03e9c04a | Brad Neuman | /*
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| 2 | * Copyright (c) 2005, Kohsuke Ohtani
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the author nor the names of any co-contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 | |||
| 30 | #include <sys/signal.h> |
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| 31 | |||
| 32 | #include <stddef.h> |
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| 33 | #include <signal.h> |
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| 34 | #include <errno.h> |
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| 35 | |||
| 36 | int
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| 37 | sigprocmask(int how, const sigset_t *set, sigset_t *oldset) |
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| 38 | {
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| 39 | sigset_t newset = 0;
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| 40 | |||
| 41 | if (set != NULL) |
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| 42 | newset = *set; |
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| 43 | |||
| 44 | SIGNAL_LOCK(); |
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| 45 | |||
| 46 | if (oldset != NULL) |
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| 47 | *oldset = __sig_mask; |
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| 48 | |||
| 49 | if (set != NULL) { |
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| 50 | switch (how) {
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| 51 | case SIG_BLOCK:
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| 52 | __sig_mask |= newset; |
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| 53 | break;
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| 54 | case SIG_UNBLOCK:
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| 55 | __sig_mask &= ~newset; |
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| 56 | break;
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| 57 | case SIG_SETMASK:
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| 58 | __sig_mask = newset; |
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| 59 | break;
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| 60 | default:
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| 61 | SIGNAL_UNLOCK(); |
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| 62 | errno = EINVAL; |
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| 63 | return -1; |
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| 64 | } |
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| 65 | } |
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| 66 | __sig_mask &= ~(sigmask(SIGSTOP) | sigmask(SIGKILL)); |
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| 67 | |||
| 68 | SIGNAL_UNLOCK(); |
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| 69 | |||
| 70 | /* Process pending signal */
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| 71 | __sig_flush(); |
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| 72 | |||
| 73 | return 0; |
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| 74 | } |