lib/libc/sys-minix/sigreturn.c

   1 #include <sys/cdefs.h>
   2 #include <lib.h>
   3 #include "namespace.h"
   4
   5 #include <signal.h>
   6 #include <sys/signal.h>
   7
   8 #ifdef __weak_alias
   9 __weak_alias(sigreturn, _sigreturn)
  10 #endif
  11
  12 int sigreturn(scp)
  13 register struct sigcontext *scp;
  14 {
  15   sigset_t set;
  16
  17   /* The message can't be on the stack, because the stack will vanish out
  18    * from under us.  The send part of sendrec will succeed, but when
  19    * a message is sent to restart the current process, who knows what will
  20    * be in the place formerly occupied by the message?
  21    */
  22   static message m;
  23
  24   /* Protect against race conditions by blocking all interrupts. */
  25   sigfillset(&set);             /* splhi */
  26   sigprocmask(SIG_SETMASK, &set, (sigset_t *) NULL);
  27
  28   m.m2_l1 = scp->sc_mask;
  29   m.m2_i2 = scp->sc_flags;
  30   m.m2_p1 = (char *) scp;
  31   return(_syscall(PM_PROC_NR, SIGRETURN, &m));  /* normally this doesn't return */
  32 }