common-utils: implement generate_glusterfs_ctx_id()

This patch creates a common and shared version of the often copy/
pasted generate_uuid() function, which is used to create an ID string
to uniquely identify an instance of a glusterfs process/glusterfs_ctx_t.

Change-Id: Ie4e697ae28b6e954c5c261c69e37738f289d77e4
BUG: 839950
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.com/3677
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>

2 files changed, 35 insertions, 0 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index d09cafc6868..cd7045277ba 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -2150,3 +2150,36 @@ _gf_timestuff (gf_timefmts *fmt, const char ***fmts, const char ***zeros)
         *zeros = __gf_zerotimes;
 }
 
+
+char *
+generate_glusterfs_ctx_id (void)
+{
+        char           tmp_str[1024] = {0,};
+        char           hostname[256] = {0,};
+        struct timeval tv = {0,};
+        char           now_str[32];
+
+        if (gettimeofday (&tv, NULL) == -1) {
+                gf_log ("glusterfsd", GF_LOG_ERROR,
+                        "gettimeofday: failed %s",
+                        strerror (errno));
+        }
+
+        if (gethostname (hostname, 256) == -1) {
+                gf_log ("glusterfsd", GF_LOG_ERROR,
+                        "gethostname: failed %s",
+                        strerror (errno));
+        }
+
+        gf_time_fmt (now_str, sizeof now_str, tv.tv_sec, gf_timefmt_Ymd_T);
+        snprintf (tmp_str, sizeof tmp_str, "%s-%d-%s:%"
+#ifdef GF_DARWIN_HOST_OS
+                  PRId32,
+#else
+                  "ld",
+#endif
+                  hostname, getpid(), now_str, tv.tv_usec);
+
+        return gf_strdup (tmp_str);
+}
+
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 26af45fcc7b..f21ade40b8f 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -552,4 +552,6 @@ void gf_path_strip_trailing_slashes (char *path);
 uint64_t get_mem_size ();
 int gf_strip_whitespace (char *str, int len);
 int gf_canonicalize_path (char *path);
+char *generate_glusterfs_ctx_id (void);
+
 #endif /* _COMMON_UTILS_H */