lib, irmd, ipcpd: Provide the feature to write to logs

Writing output to log files is now enabled by default. Logs are
written to <INSTALL_PREFIX>/var/log/ouroboros, which is created on
install. There is a log file for the irmd and one per IPCP. To still
get (colored) output on stdout, provide the --stdout switch when
starting the irmd.

Fixes #17

3 files changed, 49 insertions, 0 deletions

diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index 57f44f15..9c45269c 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -31,6 +31,7 @@ set(SOURCE_FILES
   ipcp.c
   irm.c
   list.c
+  logs.c
   nsm.c
   shm_ap_rbuff.c
   shm_du_map.c
diff --git a/src/lib/ipcp.c b/src/lib/ipcp.c
index e4a82b60..5d46940d 100644
--- a/src/lib/ipcp.c
+++ b/src/lib/ipcp.c
@@ -109,6 +109,7 @@ pid_t ipcp_create(enum ipcp_type ipcp_type)
         char * ipcp_dir = "/sbin/";
         char * full_name = NULL;
         char * exec_name = NULL;
+        char * log_file = NULL;
 
         sprintf(irmd_api, "%u", getpid());
 
@@ -149,8 +150,19 @@ pid_t ipcp_create(enum ipcp_type ipcp_type)
         strcat(full_name, exec_name);
         full_name[len] = '\0';
 
+        if (logfile != NULL) {
+                log_file = malloc(20);
+                if (log_file == NULL) {
+                        LOG_ERR("Failed to malloc.");
+                        exit(EXIT_FAILURE);
+                }
+                sprintf(log_file, "ipcpd-%u.log", getpid());
+        }
+
+        /* log_file to be placed at the end */
         char * argv[] = {full_name,
                          irmd_api,
+                         log_file,
                          0};
 
         char * envp[] = {0};
diff --git a/src/lib/logs.c b/src/lib/logs.c
new file mode 100644
index 00000000..d86073e4
--- /dev/null
+++ b/src/lib/logs.c
@@ -0,0 +1,36 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Logging facilities
+ *
+ *    Sander Vrijders <sander.vrijders@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define OUROBOROS_PREFIX "logging"
+
+#include <ouroboros/logs.h>
+
+FILE * logfile = NULL;
+
+int set_logfile(char * filename)
+{
+        logfile = fopen(filename, "w");
+        if (logfile == NULL)
+                return -1;
+
+        return 0;
+}