minix/lib/libc/sys-minix/sigreturn.c
Lionel Sambuc 9a4c1520cf Message type for PM_SIG{RETURN,SUSPEND,PROCMASK}
Change-Id: Id20352db47892eb6b870ea64ba52b3b1a293cbaa
2014-07-28 17:05:42 +02:00

32 lines
891 B
C

#include "namespace.h"
#include <sys/cdefs.h>
#include <lib.h>
#include <string.h>
#include <assert.h>
#include <signal.h>
#include <string.h>
#include <sys/signal.h>
#include <machine/signal.h>
int sigreturn(struct sigcontext *scp)
{
sigset_t set;
/* The message can't be on the stack, because the stack will vanish out
* from under us. The send part of ipc_sendrec will succeed, but when
* a message is sent to restart the current process, who knows what will
* be in the place formerly occupied by the message?
*/
static message m;
/* Protect against race conditions by blocking all interrupts. */
sigfillset(&set); /* splhi */
sigprocmask(SIG_SETMASK, &set, NULL);
memset(&m, 0, sizeof(m));
m.m_lc_pm_sigset.set = scp->sc_mask;
m.m_lc_pm_sigset.ctx = (vir_bytes)scp;
return(_syscall(PM_PROC_NR, PM_SIGRETURN, &m)); /* normally doesn't return */
}