localtime and ctime are not MT-SAFE

There are a number of nit-level issues throughout the source with
the use of localtime and ctime. While they apparently aren't causing
too many problems, apart from the one in bz 828058, they ought to be
fixed.  Among the "real" problems that are fixed in this patch:
 1) general localtime and ctime not MT-SAFE. There's a non-zero chance
    that another thread calling localtime (or ctime) will over-write
    the static data about to be used in another thread
 2) localtime(& <64-bit-type>) or ctime(& <64-bit-type>) generally
    not a problem on 64-bit or little-endian 32-bit. But even though
    we probably have zero users on big-ending 32-bit platforms, it's
    still incorrect.
 3) multiple nested calls passed as params. Last one wins, i.e. over-
    writes result of prior calls.
 4) Inconsistent error handling. Most of these calls are for logging,
    tracing, or dumping. I submit that if an error somehow occurs in
    the call to localtime or ctime, the log/trace/dump still should
    still occur.
 5) Appliances should all have their clocks set to UTC, and all log
    entries, traces, and dumps should use GMT.
 6) fix strtok(), change to strtok_r()

Other things this patch fixes/changes (that aren't bugs per se):
 1) Change "%Y-%m-%d %H:%M:%S" and similar to their equivalent shorthand,
    e.g. "%F %T"
 2) change sizeof(timestr) to sizeof timestr. sizeof is an operator,
    not a function. You don't use i +(32), why use sizeof(<var>).
    (And yes, you do use parens with sizeof(<type>).)
 3) change 'char timestr[256]' to 'char timestr[32]' where appropriate.
    Per-thread stack is limited. Time strings are never longer than ~20
    characters, so why waste 220+ bytes on the stack?

Things this patch doesn't fix:
 1) hodgepodge of %Y-%m-%d %H:%M:%S versus %Y/%m/%d-%H%M%S and other
    variations. It's not clear to me whether this ever matters, not to
    mention 3rd party log filtering tools may already rely on a
    particular format. Still it would be nice to have a single manifest
    constant and have every call to localtime/strftime consistently use
    the same format.

Change-Id: I827cad7bf53e57b69c0173f67abe72884249c1a9
BUG: 832173
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.com/3568
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

4 files changed, 36 insertions, 58 deletions

diff --git a/cli/src/cli-cmd-parser.c b/cli/src/cli-cmd-parser.c
index 931d89ae..8c16588a 100644
--- a/cli/src/cli-cmd-parser.c
+++ b/cli/src/cli-cmd-parser.c
@@ -1581,12 +1581,10 @@ cli_cmd_gsync_set_parse (const char **words, int wordcount, dict_t **options)
                         if (strcmp (words[cmdi + 1], "checkpoint") == 0 &&
                             strcmp (append_str, "now") == 0) {
                                 struct timeval tv = {0,};
-                                struct tm     *tm = NULL;
 
                                 ret = gettimeofday (&tv, NULL);
                                 if (ret == -1)
-                                         goto out;
-                                tm = localtime (&tv.tv_sec);
+                                         goto out; /* FIXME: free append_str? */
 
                                 GF_FREE (append_str);
                                 append_str = GF_CALLOC (1, 300, cli_mt_append_str);
@@ -1595,9 +1593,9 @@ cli_cmd_gsync_set_parse (const char **words, int wordcount, dict_t **options)
                                         goto out;
                                 }
                                 strcpy (append_str, "as of ");
-                                strftime (append_str + strlen ("as of "),
-                                          300 - strlen ("as of "),
-                                          "%Y-%m-%d %H:%M:%S", tm);
+                                gf_time_fmt (append_str + strlen ("as of "),
+                                             300 - strlen ("as of "),
+                                             tv.tv_sec, gf_timefmt_FT);
                         }
 
                         ret = dict_set_dynstr (dict, "op_value", append_str);
diff --git a/cli/src/cli-rpc-ops.c b/cli/src/cli-rpc-ops.c
index 0b64758f..492be438 100644
--- a/cli/src/cli-rpc-ops.c
+++ b/cli/src/cli-rpc-ops.c
@@ -4069,15 +4069,15 @@ gf_cli3_1_top_volume_cbk (struct rpc_req *req, struct iovec *iov,
 {
         gf_cli_rsp                        rsp   = {0,};
         int                               ret   = -1;
-        dict_t                            *dict = NULL;
+        dict_t                           *dict = NULL;
         gf1_cli_stats_op                  op = GF_CLI_STATS_NONE;
         char                              key[256] = {0};
         int                               i = 0;
         int32_t                           brick_count = 0;
         char                              brick[1024];
         int32_t                           members = 0;
-        char                              *filename;
-        char                              *bricks;
+        char                             *filename;
+        char                             *bricks;
         uint64_t                          value = 0;
         int32_t                           j = 0;
         gf1_cli_top_op                    top_op = GF_CLI_TOP_NONE;
@@ -4085,11 +4085,10 @@ gf_cli3_1_top_volume_cbk (struct rpc_req *req, struct iovec *iov,
         uint64_t                          max_nr_open = 0;
         double                            throughput = 0;
         double                            time = 0;
-        long int                          time_sec = 0;
+        int32_t                           time_sec = 0;
         long int                          time_usec = 0;
-        struct tm                         *tm = NULL;
         char                              timestr[256] = {0, };
-        char                              *openfd_str = NULL;
+        char                             *openfd_str = NULL;
         gf_boolean_t                      nfs = _gf_false;
         gf_boolean_t                      clear_stats = _gf_false;
         int                               stats_cleared = 0;
@@ -4262,11 +4261,9 @@ gf_cli3_1_top_volume_cbk (struct rpc_req *req, struct iovec *iov,
                                 ret = dict_get_int32 (dict, key, (int32_t *)&time_usec);
                                 if (ret)
                                         goto out;
-                                tm    = localtime (&time_sec);
-                                if (!tm)
-                                        goto out;
-                                strftime (timestr, 256, "%Y-%m-%d %H:%M:%S", tm);
-                                snprintf (timestr + strlen (timestr), 256 - strlen (timestr),
+                                gf_time_fmt (timestr, sizeof timestr,
+                                             time_sec, gf_timefmt_FT);
+                                snprintf (timestr + strlen (timestr), sizeof timestr - strlen (timestr),
                                   ".%"GF_PRI_SUSECONDS, time_usec);
                                 if (strlen (filename) < VOL_TOP_PERF_FILENAME_DEF_WIDTH)
                                         cli_out ("%*"PRIu64" %-*s %-*s",
@@ -5854,52 +5851,43 @@ cmd_heal_volume_brick_out (dict_t *dict, int brick)
         uint64_t        num_entries = 0;
         int             ret = 0;
         char            key[256] = {0};
-        char            *hostname = NULL;
-        char            *path = NULL;
-        char            *status = NULL;
+        char           *hostname = NULL;
+        char           *path = NULL;
+        char           *status = NULL;
         uint64_t        i = 0;
         uint32_t        time = 0;
-        char            timestr[256] = {0};
-        struct tm       tm = {0};
-        time_t          ltime = 0;
+        char            timestr[32] = {0};
 
-        snprintf (key, sizeof (key), "%d-hostname", brick);
+        snprintf (key, sizeof key, "%d-hostname", brick);
         ret = dict_get_str (dict, key, &hostname);
         if (ret)
                 goto out;
-        snprintf (key, sizeof (key), "%d-path", brick);
+        snprintf (key, sizeof key, "%d-path", brick);
         ret = dict_get_str (dict, key, &path);
         if (ret)
                 goto out;
         cli_out ("\nBrick %s:%s", hostname, path);
-        snprintf (key, sizeof (key), "%d-count", brick);
+        snprintf (key, sizeof key, "%d-count", brick);
         ret = dict_get_uint64 (dict, key, &num_entries);
         cli_out ("Number of entries: %"PRIu64, num_entries);
-        snprintf (key, sizeof (key), "%d-status", brick);
+        snprintf (key, sizeof key, "%d-status", brick);
         ret = dict_get_str (dict, key, &status);
         if (status && strlen (status))
                 cli_out ("Status: %s", status);
         for (i = 0; i < num_entries; i++) {
-                snprintf (key, sizeof (key), "%d-%"PRIu64, brick, i);
+                snprintf (key, sizeof key, "%d-%"PRIu64, brick, i);
                 ret = dict_get_str (dict, key, &path);
                 if (ret)
                         continue;
                 time = 0;
-                snprintf (key, sizeof (key), "%d-%"PRIu64"-time", brick, i);
+                snprintf (key, sizeof key, "%d-%"PRIu64"-time", brick, i);
                 ret = dict_get_uint32 (dict, key, &time);
                 if (!time) {
                         cli_out ("%s", path);
                 } else {
-                        ltime = time;
-                        memset (&tm, 0, sizeof (tm));
-                        if (!localtime_r (&ltime, &tm)) {
-                                snprintf (timestr, sizeof (timestr),
-                                          "Invalid time");
-                        } else {
-                                strftime (timestr, sizeof (timestr),
-                                          "%Y-%m-%d %H:%M:%S", &tm);
-                        }
-                        if (i ==0) {
+                        gf_time_fmt (timestr, sizeof timestr,
+                                     time, gf_timefmt_FT);
+                        if (i == 0) {
                                 cli_out ("at                    path on brick");
                                 cli_out ("-----------------------------------");
                         }
diff --git a/cli/src/cli-xml-output.c b/cli/src/cli-xml-output.c
index 702a7f7f..510ad010 100644
--- a/cli/src/cli-xml-output.c
+++ b/cli/src/cli-xml-output.c
@@ -1429,14 +1429,13 @@ int
 cli_xml_output_vol_top_rw_perf (xmlTextWriterPtr writer, dict_t *dict,
                                 int brick_index, int member_index)
 {
-        int             ret = -1;
-        char            *filename = NULL;
-        uint64_t        throughput = 0;
-        long int        time_sec = 0;
-        long int        time_usec = 0;
-        struct tm       *tm = NULL;
-        char            timestr[256] = {0,};
-        char            key[1024] = {0,};
+        int        ret = -1;
+        char      *filename = NULL;
+        uint64_t   throughput = 0;
+        long int   time_sec = 0;
+        long int   time_usec = 0;
+        char       timestr[256] = {0,};
+        char       key[1024] = {0,};
 
         /* <file> */
         ret = xmlTextWriterStartElement (writer, (xmlChar *)"file");
@@ -1474,14 +1473,9 @@ cli_xml_output_vol_top_rw_perf (xmlTextWriterPtr writer, dict_t *dict,
         if (ret)
                 goto out;
 
-        tm = localtime (&time_sec);
-        if (!tm) {
-                ret = -1;
-                goto out;
-        }
-        strftime (timestr, sizeof (timestr), "%Y-%m-%d %H:%M:%S", tm);
+        gf_time_fmt (timestr, sizeof timestr, time_sec, gf_timefmt_FT);
         snprintf (timestr + strlen (timestr),
-                  sizeof (timestr) - strlen (timestr),
+                  sizeof timestr - strlen (timestr),
                   ".%"GF_PRI_SUSECONDS, time_usec);
         ret = xmlTextWriterWriteFormatElement (writer, (xmlChar *)"time",
                                                "%s", timestr);
diff --git a/cli/src/cli.c b/cli/src/cli.c
index 0d66ff28..16e434f0 100644
--- a/cli/src/cli.c
+++ b/cli/src/cli.c
@@ -108,7 +108,6 @@ generate_uuid ()
         char           tmp_str[1024] = {0,};
         char           hostname[256] = {0,};
         struct timeval tv = {0,};
-        struct tm      now = {0, };
         char           now_str[32];
 
         if (gettimeofday (&tv, NULL) == -1) {
@@ -123,9 +122,8 @@ generate_uuid ()
                         strerror (errno));
         }
 
-        localtime_r (&tv.tv_sec, &now);
-        strftime (now_str, 32, "%Y/%m/%d-%H:%M:%S", &now);
-        snprintf (tmp_str, 1024, "%s-%d-%s:%"
+        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