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/*
* sigaction.c
*/
#include <signal.h>
#include <stddef.h>
#include <sys/syscall.h>
#include <klibc/sysconfig.h>
__extern void __sigreturn(void);
#if _KLIBC_NEEDS_SIGACTION_FIXUP
typedef struct sigaction *act_type;
#else
typedef const struct sigaction *act_type;
#endif
__extern int __rt_sigaction(int, act_type, struct sigaction *, size_t);
int sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
{
unsigned int needed_flags = 0
#if _KLIBC_NEEDS_SA_RESTORER
| SA_RESTORER
#endif
#if _KLIBC_NEEDS_SA_SIGINFO
| SA_SIGINFO
#endif
;
struct sigaction sa;
int rv;
if (act &&
((act->sa_flags & needed_flags) != needed_flags ||
_KLIBC_NEEDS_SIGACTION_FIXUP)) {
sa = *act;
sa.sa_flags |= needed_flags;
#if _KLIBC_NEEDS_SA_RESTORER
if (!(act->sa_flags & SA_RESTORER))
sa.sa_restorer = &__sigreturn;
#endif
act = &sa;
}
/* Check that we have the right signal API definitions */
(void)sizeof(char[_NSIG >= 64 ? 1 : -1]);
(void)sizeof(char[sizeof(sigset_t) * 8 >= _NSIG ? 1 : -1]);
(void)sizeof(char[offsetof(struct sigaction, sa_mask)
+ sizeof(sigset_t) == sizeof(struct sigaction)
? 1 : -1]);
rv = __rt_sigaction(sig, (act_type)act, oact, sizeof(sigset_t));
#if _KLIBC_NEEDS_SA_RESTORER
if (oact && (oact->sa_restorer == &__sigreturn)) {
oact->sa_flags &= ~SA_RESTORER;
}
#endif
return rv;
}
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