madwifi plugin: Signal an error in the read function when appropriate.

An error will be signaled to the daemon if querying all interfaces failed.
Querying an interface fails if all ioctls return an error.

diff --git a/src/madwifi.c b/src/madwifi.c
index 536bcd4..8b3266d 100644 (file)
--- a/src/madwifi.c
+++ b/src/madwifi.c
@@ -636,7 +636,7 @@ process_stat_struct (int which, const void *ptr, const char *dev, const char *ma
 
 }
 
-static void
+static int
 process_athstats (int sk, const char *dev)
 {
        struct ifreq ifr;
@@ -653,7 +653,7 @@ process_athstats (int sk, const char *dev)
                                "SIOCGATHSTATS to device %s "
                                "failed with status %i.",
                                dev, status);
-               return;
+               return (status);
        }
 
        /* These stats are handled as a special case, because they are
@@ -669,9 +669,10 @@ process_athstats (int sk, const char *dev)
 
        /* All other ath statistics */
        process_stat_struct (ATH_STAT, &stats, dev, NULL, "ath_stat", "ast_misc");
+       return (0);
 }
 
-static void
+static int
 process_80211stats (int sk, const char *dev)
 {
        struct ifreq ifr;
@@ -688,14 +689,15 @@ process_80211stats (int sk, const char *dev)
                                "SIOCG80211STATS to device %s "
                                "failed with status %i.",
                                dev, status);
-               return;
+               return (status);
        }
 
        process_stat_struct (IFA_STAT, &stats, dev, NULL, "ath_stat", "is_misc");
+       return (0);
 }
 
 
-static void
+static int
 process_station (int sk, const char *dev, struct ieee80211req_sta_info *si)
 {
        struct iwreq iwr;
@@ -726,7 +728,7 @@ process_station (int sk, const char *dev, struct ieee80211req_sta_info *si)
                                "IEEE80211_IOCTL_STA_STATS to device %s "
                                "failed with status %i.",
                                dev, status);
-               return;
+               return (status);
        }
 
        /* These two stats are handled as a special case as they are
@@ -743,9 +745,10 @@ process_station (int sk, const char *dev, struct ieee80211req_sta_info *si)
 
        /* All other node statistics */
        process_stat_struct (NOD_STAT, ns, dev, mac, "node_stat", "ns_misc");
+       return (0);
 }
 
-static void
+static int
 process_stations (int sk, const char *dev)
 {
        uint8_t buf[24*1024];
@@ -767,7 +770,7 @@ process_stations (int sk, const char *dev)
                                "IEEE80211_IOCTL_STA_INFO to device %s "
                                "failed with status %i.",
                                dev, status);
-               return;
+               return (status);
        }
 
        len = iwr.u.data.length;
@@ -785,14 +788,28 @@ process_stations (int sk, const char *dev)
 
        if (item_watched (STAT_ATH_NODES))
                submit_gauge (dev, "ath_nodes", NULL, NULL, nodes);
+       return (0);
 }
 
-static void
+static int
 process_device (int sk, const char *dev)
 {
-       process_athstats (sk, dev);
-       process_80211stats (sk, dev);
-       process_stations (sk, dev);
+       int num_success = 0;
+       int status;
+
+       status = process_athstats (sk, dev);
+       if (status == 0)
+               num_success++;
+
+       status = process_80211stats (sk, dev);
+       if (status == 0)
+               num_success++;
+
+       status = process_stations (sk, dev);
+       if (status == 0)
+               num_success++;
+
+       return ((num_success == 0) ? -1 : 0);
 }
 
 static int
@@ -822,22 +839,46 @@ static int
 sysfs_iterate(int sk)
 {
        struct dirent *de;
+       DIR *nets;
+       int status;
+       int num_success;
+       int num_fail;
 
-       DIR *nets = opendir ("/sys/class/net/");
+       nets = opendir ("/sys/class/net/");
        if (nets == NULL)
        {
                WARNING ("madwifi plugin: opening /sys/class/net failed");
                return (-1);
        }
 
+       num_success = 0;
+       num_fail = 0;
        while ((de = readdir (nets)))
-               if (check_devname (de->d_name) &&
-                   (ignorelist_match (ignorelist, de->d_name) == 0))
-                       process_device (sk, de->d_name);
+       {
+               if (check_devname (de->d_name) == 0)
+                       continue;
+
+               if (ignorelist_match (ignorelist, de->d_name) != 0)
+                       continue;
+
+               status = process_device (sk, de->d_name);
+               if (status != 0)
+               {
+                       ERROR ("madwifi plugin: Processing interface "
+                                       "%s failed.", de->d_name);
+                       num_fail++;
+               }
+               else
+               {
+                       num_success++;
+               }
+       } /* while (readdir) */
 
        closedir(nets);
 
-       return 0;
+       if ((num_success == 0) && (num_fail != 0))
+               return (-1);
+       return (0);
 }
 
 static int
@@ -846,6 +887,9 @@ procfs_iterate(int sk)
        char buffer[1024];
        char *device, *dummy;
        FILE *fh;
+       int status;
+       int num_success;
+       int num_fail;
        
        if ((fh = fopen ("/proc/net/dev", "r")) == NULL)
        {
@@ -853,6 +897,8 @@ procfs_iterate(int sk)
                return (-1);
        }
 
+       num_success = 0;
+       num_fail = 0;
        while (fgets (buffer, sizeof (buffer), fh) != NULL)
        {
                dummy = strchr(buffer, ':');
@@ -867,11 +913,26 @@ procfs_iterate(int sk)
                if (device[0] == 0)
                        continue;
 
-               if (ignorelist_match (ignorelist, device) == 0)
-                       process_device (sk, device);
-       }
+               if (ignorelist_match (ignorelist, device) != 0)
+                       continue;
+
+               status = process_device (sk, device);
+               if (status != 0)
+               {
+                       ERROR ("madwifi plugin: Processing interface "
+                                       "%s failed.", device);
+                       num_fail++;
+               }
+               else
+               {
+                       num_success++;
+               }
+       } /* while (fgets) */
 
        fclose(fh);
+
+       if ((num_success == 0) && (num_fail != 0))
+               return (-1);
        return 0;
 }