Allow file locking to be turned off

diff --git a/tl-append.c b/tl-append.c
index 6cc068a718627416e929d7adf046484d01064489..1b3a9d0c6fc45572f16c775eae148a09d6d4150c 100644 (file)
--- a/tl-append.c
+++ b/tl-append.c
@@ -21,15 +21,19 @@ const struct timespec ACKNOWLEDGE_DELAY = {0, 300000000};
 
 typedef struct {
   int interactive;
+  int fcntl_lock;
 } conf_t;
 
 conf_t parse_command_line(int argc, char *argv[]) {
   conf_t conf;
   conf.interactive = 0;
+  conf.fcntl_lock = 1;
 
   for (int i = 1; i < argc; i++) {
     if (strcmp(argv[i], "-i") == 0 && isatty(2))
       conf.interactive = 1;
+    if (strcmp(argv[i], "--no-fnctl-lock") == 0)
+      conf.fcntl_lock = 0;
   }
 
   return conf;
@@ -61,7 +65,9 @@ static void write_line(const char *now, FILE *f, const char *line) {
     die("Error writing to output file");
 }
 
-static void take_lock(FILE *f) {
+static void take_lock(conf_t *conf, FILE *f) {
+  if (!conf->fcntl_lock)
+    return;
   struct flock lock;
   lock.l_type = F_WRLCK;
   lock.l_whence = SEEK_SET;
@@ -94,7 +100,7 @@ static void lock_and_write_line(conf_t *conf, const char *line) {
   const char *now = encode_time(time(NULL));
   FILE *f = fopen(FILENAME, "a");
 
-  take_lock(f);
+  take_lock(conf, f);
   write_line(now, f, line);
 
   if (fclose(f) != 0)