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init: make sure fd 0,1,2 are not closed, + related optimizations.

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init_main                                            929     920      -9
bb_daemonize_or_rexec                                145     127     -18
This commit is contained in:
Denis Vlasenko
2007-06-14 07:53:06 +00:00
parent 1adf681e87
commit d8540f71ac
3 changed files with 19 additions and 20 deletions
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12
libbb/vfork_daemon_rexec.c
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@@ -202,7 +202,6 @@ int spawn_and_wait(char **argv)
return wait4pid(rc);
}
#if !BB_MMU
void forkexit_or_rexec(char **argv)
{
@@ -261,17 +260,18 @@ void bb_daemonize_or_rexec(int flags, char **argv)
if (!(flags & DAEMON_ONLY_SANITIZE)) {
forkexit_or_rexec(argv);
/* if daemonizing, make sure we detach from stdio */
/* if daemonizing, make sure we detach from stdio & ctty */
setsid();
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
}
if (fd > 2)
while (fd > 2) {
close(fd--);
if (flags & DAEMON_CLOSE_EXTRA_FDS)
while (fd > 2)
close(fd--); /* close everything after fd#2 */
if (!(flags & DAEMON_CLOSE_EXTRA_FDS))
return;
/* else close everything after fd#2 */
}
}
void bb_sanitize_stdio(void)