Add pidfile creation for lttng-sessiond

[lttng-tools.git] / src / common / utils.c

diff --git a/src/common/utils.c b/src/common/utils.c
index 1a0e47ec4ed97b1601cbc3498126a760b5e02895..2f114934fd78c654a43a9b5563f6929bc7422ec6 100644 (file)
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -16,6 +16,7 @@
  */
 
 #define _GNU_SOURCE
+#include <assert.h>
 #include <ctype.h>
 #include <fcntl.h>
 #include <limits.h>
@@ -202,3 +203,32 @@ int utils_set_fd_cloexec(int fd)
 end:
        return ret;
 }
+
+/*
+ * Create pid file to the given path and filename.
+ */
+__attribute__((visibility("hidden")))
+int utils_create_pid_file(pid_t pid, const char *filepath)
+{
+       int ret;
+       FILE *fp;
+
+       assert(filepath);
+
+       fp = fopen(filepath, "w");
+       if (fp == NULL) {
+               PERROR("open pid file %s", filepath);
+               ret = -1;
+               goto error;
+       }
+
+       ret = fprintf(fp, "%d\n", pid);
+       if (ret < 0) {
+               PERROR("fprintf pid file");
+       }
+
+       fclose(fp);
+       DBG("Pid %d written in file %s", pid, filepath);
+error:
+       return ret;
+}