[w3m-dev 03321] Bug#162104: file descriptors 1 and 2 are closed rather than reopened to /dev/null

* etc.c (mySystem): fd 0,1,2 redirect /dev/null, close all other fds
From: Fumitoshi UKAI  <ukai@debian.or.jp>

1 files changed, 8 insertions, 3 deletions

diff --git a/etc.c b/etc.c
index 08affeb..0879c4b 100644
--- a/etc.c
+++ b/etc.c
@@ -1,4 +1,4 @@
-/* $Id: etc.c,v 1.23 2002/09/24 16:35:02 ukai Exp $ */
+/* $Id: etc.c,v 1.24 2002/09/24 17:35:52 ukai Exp $ */
 #include "fm.h"
 #include <pwd.h>
 #include "myctype.h"
@@ -1208,11 +1208,16 @@ mySystem(char *command, int background)
 	int pid;
 	flush_tty();
 	if ((pid = fork()) == 0) {
+	    int fd, i;
 	    reset_signals();
 	    SETPGRP();
 	    close_tty();
-	    fclose(stdout);
-	    fclose(stderr);
+	    dup2(open("/dev/null", O_RDONLY), 0);
+	    dup2(open("/dev/null", O_WRONLY), 1);
+	    dup2(fd = open("/dev/null", O_WRONLY), 2);
+	    /* close all other file descriptors (socket, ...) */
+	    for (i = 3; i <= fd; i++)
+		close(i);
 	    execl("/bin/sh", "sh", "-c", command, NULL);
 	    exit(127);
 	}