37 lines
675 B
C
37 lines
675 B
C
#include <errno.h>
|
|
|
|
extern int errno;
|
|
|
|
#define MAXSIG 128
|
|
void (*_sig_funcs[MAXSIG])();
|
|
void _sig_catch();
|
|
void (*_signal())();
|
|
|
|
void
|
|
(*
|
|
signal(sig, handler))()
|
|
void (*handler)();
|
|
{
|
|
void (*old)(), (*retval)();
|
|
|
|
if (sig <= 0 || sig > MAXSIG) {
|
|
errno = EINVAL;
|
|
return (void (*)()) -1;
|
|
}
|
|
if ((long) handler >= 0 && (long) handler <= 2) {
|
|
retval = _signal(sig, handler);
|
|
if (retval != (void (*)()) -1) {
|
|
old = _sig_funcs[sig-1];
|
|
_sig_funcs[sig-1] = handler;
|
|
return old;
|
|
}
|
|
return retval;
|
|
}
|
|
retval = _signal(sig, _sig_catch);
|
|
if (retval != (void (*)()) -1) {
|
|
old = _sig_funcs[sig-1];
|
|
_sig_funcs[sig-1] = handler;
|
|
return old;
|
|
}
|
|
return retval;
|
|
}
|