collectdmon: Refactor the re-opening of STD{IN,OUT,ERR}.

diff --git a/src/collectdmon.c b/src/collectdmon.c
index f2798eef5f0384b210c8c4a8007f671a5645fecc..65271ddd3f424db9c3050979de59e70b328f7483 100644 (file)
--- a/src/collectdmon.c
+++ b/src/collectdmon.c
@@ -119,7 +119,7 @@ static int pidfile_delete (void)
 static int daemonize (void)
 {
        struct rlimit rl;
-       int status;
+       int dev_null;
 
        pid_t pid = 0;
        int   i   = 0;
@@ -153,29 +153,30 @@ static int daemonize (void)
        for (i = 0; i < (int)rl.rlim_max; ++i)
                close (i);
 
-       errno = 0;
-       status = open ("/dev/null", O_RDWR);
-       if (status != 0) {
-               syslog (LOG_ERR, "Error: couldn't connect STDIN to /dev/null: %s",
-                               strerror (errno));
+       dev_null = open ("/dev/null", O_RDWR);
+       if (dev_null == -1) {
+               syslog (LOG_ERR, "Error: couldn't failed to open /dev/null: %s", strerror (errno));
                return -1;
        }
 
-       errno = 0;
-       status = dup (0);
-       if (status != 1) {
-               syslog (LOG_ERR, "Error: couldn't connect STDOUT to /dev/null: %s",
-                               strerror (errno));
+       if (dup2 (dev_null, STDIN_FILENO) == -1) {
+               syslog (LOG_ERR, "Error: couldn't connect STDIN to /dev/null: %s", strerror (errno));
                return -1;
        }
 
-       errno = 0;
-       status = dup (0);
-       if (status != 2) {
-               syslog (LOG_ERR, "Error: couldn't connect STDERR to /dev/null: %s",
-                               strerror (errno));
+       if (dup2 (dev_null, STDOUT_FILENO) == -1) {
+               syslog (LOG_ERR, "Error: couldn't connect STDOUT to /dev/null: %s", strerror (errno));
                return -1;
        }
+
+       if (dup2 (dev_null, STDERR_FILENO) == -1) {
+               syslog (LOG_ERR, "Error: couldn't connect STDERR to /dev/null: %s", strerror (errno));
+               return -1;
+       }
+
+       if ((dev_null != STDIN_FILENO) && (dev_null != STDOUT_FILENO) && (dev_null != STDERR_FILENO))
+               close (dev_null);
+
        return 0;
 } /* daemonize */