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