cli: Introduce a logfile command to log errors to a file

The evolution would be to introduce libosmocore and start using
the logging framework. But even then we can map this option to
the file target.

Fixes: SYS#263

1 files changed, 12 insertions, 0 deletions

diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
index 1152519..0022b1b 100644
--- a/ggsn/ggsn.c
+++ b/ggsn/ggsn.c
@@ -283,6 +283,18 @@ int main(int argc, char **argv)
 	if (cmdline_parser_configfile(args_info.conf_arg, &args_info, 0, 0, 0)
 	    != 0)
 		exit(1);
+
+	/* Open a log file */
+	if (args_info.logfile_arg) {
+		FILE* log_file = fopen(args_info.logfile_arg, "a");
+		if (!log_file) {
+			printf("Failed to open logfile: '%s'\n",
+				args_info.logfile_arg);
+			exit(1);
+		}
+		sys_err_setlogfile(log_file);
+	}
+
 	if (args_info.debug_flag) {
 		printf("cmdline_parser_configfile\n");
 		printf("listen: %s\n", args_info.listen_arg);