minix/lib/libc/sys/sigreturn.c

   1 #include "namespace.h"
   2
   3 #include <sys/cdefs.h>
   4 #include <lib.h>
   5
   6 #include <string.h>
   7 #include <assert.h>
   8 #include <signal.h>
   9 #include <string.h>
  10 #include <sys/signal.h>
  11 #include <machine/signal.h>
  12
  13 int sigreturn(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 ipc_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, NULL);
  27
  28   memset(&m, 0, sizeof(m));
  29   m.m_lc_pm_sigset.set = scp->sc_mask;
  30   m.m_lc_pm_sigset.ctx = (vir_bytes)scp;
  31   return(_syscall(PM_PROC_NR, PM_SIGRETURN, &m)); /* normally doesn't return */
  32 }