minix/lib/libc/sys-minix/sigreturn.c

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#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, (sigset_t *) NULL);
memset(&m, 0, sizeof(m));
m.PM_SIG_SET = scp->sc_mask;
m.PM_SIG_CTX = (char *) scp;
return(_syscall(PM_PROC_NR, PM_SIGRETURN, &m)); /* normally doesn't return */
}