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/* ISC license. */
/* MT-unsafe */
#include <skalibs/nonposix.h>
#include <skalibs/bsdsnowflake.h>
#include <signal.h>
#include <errno.h>
#include <skalibs/functypes.h>
#include <skalibs/sig.h>
#include <skalibs/nsig.h>
/*
BSD fails sigaction() with EINVAL on non-catchable signals, whereas
every reasonable OS succeeds and simply ignores the signal handler.
*/
int sig_catch (int sig, sig_func_ref f)
{
struct sigaction action = { .sa_handler = f, .sa_flags = SA_RESTART | SA_NOCLDSTOP } ;
sigfillset(&action.sa_mask) ;
return sigaction(sig, &action, 0) >= 0
#ifdef SKALIBS_BSD_SUCKS
|| (errno == EINVAL && sig >= 1 && sig <= NSIG)
#endif
;
}
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