#include <sys/syscall.h>
#include <signal.h>
#include <sys/signal.h>
#include <errno.h>
extern void (*sigcatch[NSIG])();
#if defined(__DYNAMIC__)
extern int __in_sigtramp;
#endif
static int
sigaction__ (sig, nsv, osv, bind)
int sig;
register struct sigaction *nsv, *osv;
int bind;
{
struct sigaction vec;
void (*prevsig)();
extern void _sigtramp();
if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) {
errno = EINVAL;
return (-1);
}
prevsig = sigcatch[sig];
if (nsv) {
sigcatch[sig] = nsv->sa_handler;
vec = *nsv; nsv = &vec;
if (nsv->sa_handler != (void (*)())SIG_DFL && nsv->sa_handler != (void (*)())SIG_IGN) {
nsv->sa_handler = _sigtramp;
#ifdef __DYNAMIC__
if (bind && (__in_sigtramp == 0)) _dyld_bind_fully_image_containing_address(sigcatch[sig]);
#endif
}
}
if (syscall (SYS_sigaction, sig, nsv, osv) < 0) {
sigcatch[sig] = prevsig;
return (-1);
}
if (osv && prevsig)
osv->sa_handler = prevsig;
return (0);
}
int
sigaction (sig, nsv, osv)
int sig;
register const struct sigaction *nsv;
register struct sigaction *osv;
{
return sigaction__(sig, nsv, osv, 1);
}
#ifdef __DYNAMIC__
int
_sigaction_nobind (sig, nsv, osv)
int sig;
register const struct sigaction *nsv;
register struct sigaction *osv;
{
return sigaction__(sig, nsv, osv, 0);
}
#endif