[u/mdw/putty] / unix / signal.c

#include <signal.h>

/*
 * Calling signal() is a 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)
 */
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;
}

/*
Local Variables:
c-basic-offset:4
comment-column:40
End:
*/
Commit	Line	Data
0f33f9d1	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	*/