| 1 | #include <signal.h> |
| 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | |
| 5 | /* |
| 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. |
| 9 | * |
| 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) |
| 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 | |
| 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 | |
| 40 | /* |
| 41 | Local Variables: |
| 42 | c-basic-offset:4 |
| 43 | comment-column:40 |
| 44 | End: |
| 45 | */ |