source:
EcnlProtoTool/trunk/musl-1.1.18/src/signal/sigset.c@
445
Last change on this file since 445 was 444, checked in by , 4 years ago | |
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File size: 627 bytes |
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1 | #include <signal.h> |
2 | |
3 | void (*sigset(int sig, void (*handler)(int)))(int) |
4 | { |
5 | struct sigaction sa, sa_old; |
6 | sigset_t mask; |
7 | |
8 | sigemptyset(&mask); |
9 | if (sigaddset(&mask, sig) < 0) |
10 | return SIG_ERR; |
11 | |
12 | if (handler == SIG_HOLD) { |
13 | if (sigaction(sig, 0, &sa_old) < 0) |
14 | return SIG_ERR; |
15 | if (sigprocmask(SIG_BLOCK, &mask, &mask) < 0) |
16 | return SIG_ERR; |
17 | } else { |
18 | sa.sa_handler = handler; |
19 | sa.sa_flags = 0; |
20 | sigemptyset(&sa.sa_mask); |
21 | if (sigaction(sig, &sa, &sa_old) < 0) |
22 | return SIG_ERR; |
23 | if (sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0) |
24 | return SIG_ERR; |
25 | } |
26 | return sigismember(&mask, sig) ? SIG_HOLD : sa_old.sa_handler; |
27 | } |
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