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/*
* PuTTY's wrapper on signal(2).
*
* Calling signal() is non-portable, as it varies in meaning between
* platforms and depending on feature macros, and has stupid semantics
* at least some of the time.
*
* This function provides the same interface as the libc function, but
* provides consistent semantics. It assumes POSIX semantics for
* sigaction() (so you might need to do some more work if you port to
* something ancient like SunOS 4).
*/
#include <signal.h>
#include "defs.h"
void (*putty_signal(int sig, void (*func)(int)))(int)
{
struct sigaction sa;
struct sigaction old;
sa.sa_handler = func;
if(sigemptyset(&sa.sa_mask) < 0)
return SIG_ERR;
sa.sa_flags = SA_RESTART;
if(sigaction(sig, &sa, &old) < 0)
return SIG_ERR;
return old.sa_handler;
}
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