minix/lib/posix/_sigreturn.c
2005-04-21 14:53:53 +00:00

60 lines
1.5 KiB
C
Executable file

#include <lib.h>
#define sigfillset _sigfillset
#define sigjmp _sigjmp
#define sigprocmask _sigprocmask
#define sigreturn _sigreturn
#include <sys/sigcontext.h>
#include <setjmp.h>
#include <signal.h>
_PROTOTYPE( int sigjmp, (jmp_buf jb, int retval));
#if (_SETJMP_SAVES_REGS == 0)
/* 'sigreturn' using a short format jmp_buf (no registers saved). */
PUBLIC int sigjmp(jb, retval)
jmp_buf jb;
int retval;
{
struct sigcontext sc;
sc.sc_flags = jb[0].__flags;
sc.sc_mask = jb[0].__mask;
#if (CHIP == INTEL)
sc.sc_pc = (int) jb[0].__pc;
sc.sc_sp = (int) jb[0].__sp;
sc.sc_fp = (int) jb[0].__lb;
#endif
#if (CHIP == M68000)
sc.sc_pc = (long) jb[0].__pc;
sc.sc_sp = (long) jb[0].__sp;
sc.sc_fp = (long) jb[0].__lb;
#endif
sc.sc_retreg = retval;
return sigreturn(&sc);
}
#endif
PUBLIC int sigreturn(scp)
register 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 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);
m.m2_l1 = scp->sc_mask;
m.m2_i2 = scp->sc_flags;
m.m2_p1 = (char *) scp;
return(_syscall(MM, SIGRETURN, &m)); /* normally this doesn't return */
}