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#include "stddef.h"
#include "sys/types.h"
#include <signal.h>
#include "_syscall.h"
int sigaction(int sig, const struct sigaction * restrict act, struct sigaction * restrict oact)
{
struct linux_action {
union {
void (*handler)(int);
void (*action)(int, struct sigaction *, void *);
} fn;
unsigned long flags;
void (*restorer)(void);
sigset_t mask;
};
SYSCALL_NUMBER(scno, sigaction, -1);
struct linux_action a = { 0 }, o = { 0 };
int ret = -1;
a.fn.handler = act->sa_handler;
#ifdef SA_SIGINFO
if (act->sa_flags & SA_SIGINFO) {
a.fn.action = act->sa_sigaction;
#endif
a.flags = act->sa_flags;
a.mask = act->sa_mask;
ret = __syscall(scno, sig, &a, &o, sizeof(act->sa_mask), 0, 0);
if (ret != -1 && oact != NULL) {
oact->sa_handler = o.fn.handler;
#ifdef SA_SIGINFO
if (o.flags & SA_SIGINFO) {
oact->sa_sigaction = o.fn.action;
}
#endif
oact->sa_flags = o.flags;
oact->sa_mask = o.mask;
}
return ret;
}
/*
POSIX(1)
*/
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