tapset/dyninst/ctime.stp

   1 /* ctime.stp - Convert seconds to human readable date string.
   2  *
   3  * Copyright (C) 2012 Red Hat, Inc.
   4  */
   5
   6 /* NB: functionally equivalent to linux/ctime.stp
   7  * This means unlike normal userspace ctime(), this version
   8  * returns time in UTC, without a final newline.
   9  */
  10
  11 %{
  12 #include <string.h>
  13 #include <time.h>
  14 %}
  15
  16 function ctime:string(epochsecs:long)
  17 %{  /* pure */
  18     struct tm gmt;
  19     char buf[26];
  20
  21     const time_t t = STAP_ARG_epochsecs;
  22
  23     if (gmtime_r(&t, &gmt) && asctime_r(&gmt, buf)) {
  24         char* newline = strchr(buf, '\n');
  25         if (newline)
  26             *newline = '\0';
  27         strlcpy (STAP_RETVALUE, buf, MAXSTRINGLEN);
  28     } else {
  29 #if STAP_COMPAT_VERSION <= STAP_VERSION(2,2)
  30         strlcpy(STAP_RETVALUE, "<invalid time>", MAXSTRINGLEN);
  31 #else
  32         CONTEXT->last_error = "Time cannot be converted";
  33 #endif
  34     }
  35 %}