Add some logging for errors reading/writing the leasefile.

diff --git a/dhcp.c b/dhcp.c
index f347acaa60cf3662728026fd3a3dbeace5d8593c..be08c004c7f9999b4a348d33c1b7ebd5eaa08c33 100644 (file)
--- a/dhcp.c
+++ b/dhcp.c
@@ -30,6 +30,7 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <string.h>
+#include <syslog.h>
 #include <unistd.h>
 
 #include "config.h"
@@ -1041,9 +1042,14 @@ write_lease(const struct interface *iface, const struct dhcp_message *dhcp)
                return 0;
        }
 
+       syslog(LOG_DEBUG, "%s: writing lease `%s'",
+           iface->name, iface->leasefile);
+
        fd = open(iface->leasefile, O_WRONLY | O_CREAT | O_TRUNC, 0400);
-       if (fd == -1)
+       if (fd == -1) {
+               syslog(LOG_ERR, "%s: open: %m", iface->name);
                return -1;
+       }
 
        /* Only write as much as we need */
        while (p < e) {
@@ -1071,8 +1077,14 @@ read_lease(const struct interface *iface)
        ssize_t bytes;
 
        fd = open(iface->leasefile, O_RDONLY);
-       if (fd == -1)
+       if (fd == -1) {
+               if (errno != ENOENT)
+                       syslog(LOG_ERR, "%s: open `%s': %m",
+                           iface->name, iface->leasefile);
                return NULL;
+       }
+       syslog(LOG_DEBUG, "%s: reading lease `%s'",
+           iface->name, iface->leasefile);
        dhcp = xmalloc(sizeof(*dhcp));
        memset(dhcp, 0, sizeof(*dhcp));
        bytes = read(fd, dhcp, sizeof(*dhcp));