posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/evutil.c

 /*
  * Copyright (c) 2007 Niels Provos <provos@citi.umich.edu>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 35 matching lines @@
 #include <fcntl.h>
 #endif
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
 #include <errno.h>
 #if defined WIN32 && !defined(HAVE_GETTIMEOFDAY_H)
 #include <sys/timeb.h>
 #endif
 #include <stdio.h>
+#include <signal.h>
 
+#include <sys/queue.h>
+#include "event.h"
+#include "event-internal.h"
 #include "evutil.h"
 #include "log.h"
 
 int
 evutil_socketpair(int family, int type, int protocol, int fd[2])
 {
 #ifndef WIN32
         return socketpair(family, type, protocol, fd);
 #else
         /* This code is originally from Tor.  Used with permission. */
@@ skipping 169 matching lines @@
         if (r >= 0)
                 return r;
         else
                 return _vscprintf(format, ap);
 #else
         int r = vsnprintf(buf, buflen, format, ap);
         buf[buflen-1] = '\0';
         return r;
 #endif
 }
+
+static int
+evutil_issetugid(void)
+{
+#ifdef _EVENT_HAVE_ISSETUGID
+        return issetugid();
+#else
+
+#ifdef _EVENT_HAVE_GETEUID
+        if (getuid() != geteuid())
+                return 1;
+#endif
+#ifdef _EVENT_HAVE_GETEGID
+        if (getgid() != getegid())
+                return 1;
+#endif
+        return 0;
+#endif
+}
+
+const char *
+evutil_getenv(const char *varname)
+{
+        if (evutil_issetugid())
+                return NULL;
+
+        return getenv(varname);
+}