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1 | #include <signal.h> |
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2 | #include <stdio.h> |
3 | #include <stdlib.h> |
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4 | |
5 | /* |
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6 | * Calling signal() is non-portable, as it varies in meaning |
7 | * between platforms and depending on feature macros, and has |
8 | * stupid semantics at least some of the time. |
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9 | * |
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10 | * This function provides the same interface as the libc function, |
11 | * but provides consistent semantics. It assumes POSIX semantics |
12 | * for sigaction() (so you might need to do some more work if you |
13 | * port to something ancient like SunOS 4) |
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14 | */ |
15 | void (*putty_signal(int sig, void (*func)(int)))(int) { |
16 | struct sigaction sa; |
17 | struct sigaction old; |
18 | |
19 | sa.sa_handler = func; |
20 | if(sigemptyset(&sa.sa_mask) < 0) |
21 | return SIG_ERR; |
22 | sa.sa_flags = SA_RESTART; |
23 | if(sigaction(sig, &sa, &old) < 0) |
24 | return SIG_ERR; |
25 | return old.sa_handler; |
26 | } |
27 | |
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28 | void block_signal(int sig, int block_it) |
29 | { |
30 | sigset_t ss; |
31 | |
32 | sigemptyset(&ss); |
33 | sigaddset(&ss, sig); |
34 | if(sigprocmask(block_it ? SIG_BLOCK : SIG_UNBLOCK, &ss, 0) < 0) { |
35 | perror("sigprocmask"); |
36 | exit(1); |
37 | } |
38 | } |
39 | |
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40 | /* |
41 | Local Variables: |
42 | c-basic-offset:4 |
43 | comment-column:40 |
44 | End: |
45 | */ |