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Commit | Line | Data |
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320054e8 DG |
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 | } |