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Using syscall in a vfork is safe for sigaction and sigprogmask.

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Roy Marples 2008-02-02 00:38:06 +00:00
parent ad04517623
commit e2919519d7
1 changed files with 10 additions and 9 deletions
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19
src/librc/librc.c
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@ -32,6 +32,7 @@
const char librc_copyright[] = "Copyright (c) 2007-2008 Roy Marples";
#include "librc.h"
#include <sys/syscall.h>
#include <signal.h>
#define SOFTLEVEL RC_SVCDIR "/softlevel"
@ -606,18 +607,18 @@ static pid_t _exec_service (const char *service, const char *arg)
sigfillset (&full);
sigprocmask (SIG_SETMASK, &full, &old);
if ((pid = fork ()) == 0) {
if ((pid = vfork ()) == 0) {
/* Restore default handlers */
sigaction (SIGCHLD, &sa, NULL);
sigaction (SIGHUP, &sa, NULL);
sigaction (SIGINT, &sa, NULL);
sigaction (SIGQUIT, &sa, NULL);
sigaction (SIGTERM, &sa, NULL);
sigaction (SIGUSR1, &sa, NULL);
sigaction (SIGWINCH, &sa, NULL);
syscall (SYS_sigaction, SIGCHLD, &sa, NULL);
syscall (SYS_sigaction, SIGHUP, &sa, NULL);
syscall (SYS_sigaction, SIGINT, &sa, NULL);
syscall (SYS_sigaction, SIGQUIT, &sa, NULL);
syscall (SYS_sigaction, SIGTERM, &sa, NULL);
syscall (SYS_sigaction, SIGUSR1, &sa, NULL);
syscall (SYS_sigaction, SIGWINCH, &sa, NULL);
/* Unmask signals */
sigprocmask (SIG_SETMASK, &empty, NULL);
syscall (SYS_sigprocmask, SIG_SETMASK, &empty, NULL);
/* Safe to run now */
execl (file, file, arg, (char *) NULL);