GN: aix port along with linux_s390x, linux_ppc64 and linux_ppc64le support.

base/time/time_posix.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/time/time.h"
 
 #include <stdint.h>
 #include <sys/time.h>
 #include <time.h>
 #if defined(OS_ANDROID) && !defined(__LP64__)
@@ skipping 43 matching lines @@
 }
 
 void SysTimeToTimeStruct(SysTime t, struct tm* timestruct, bool is_local) {
   base::AutoLock locked(*GetSysTimeToTimeStructLock());
   if (is_local)
     localtime64_r(&t, timestruct);
   else
     gmtime64_r(&t, timestruct);
 }
 
+#elif defined(OS_AIX)
+
+// timegm is not available on AIX
+// we should perhaps use a more portable alternative
+time_t aix_timegm(struct tm* tm) {
+  time_t ret;
+  char* tz;
+
+  tz = getenv("TZ");
+  if (tz) {
+    tz = strdup(tz);
+  }
+  setenv("TZ", "GMT0", 1);
+  tzset();
+  ret = mktime(tm);
+  if (tz) {
+    setenv("TZ", tz, 1);
+    free(tz);
+  } else {
+    unsetenv("TZ");
+  }
+  tzset();
+  return ret;
+}
+
+typedef time_t SysTime;
+
+SysTime SysTimeFromTimeStruct(struct tm* timestruct, bool is_local) {
+  base::AutoLock locked(*GetSysTimeToTimeStructLock());
+  if (is_local)
+    return mktime(timestruct);
+  else
+    return aix_timegm(timestruct);
+}
+
+void SysTimeToTimeStruct(SysTime t, struct tm* timestruct, bool is_local) {
+  base::AutoLock locked(*GetSysTimeToTimeStructLock());
+  if (is_local)
+    localtime_r(&t, timestruct);
+  else
+    gmtime_r(&t, timestruct);
+}
+
 #else  // OS_ANDROID && !__LP64__
 typedef time_t SysTime;
 
 SysTime SysTimeFromTimeStruct(struct tm* timestruct, bool is_local) {
   base::AutoLock locked(*GetSysTimeToTimeStructLock());
   if (is_local)
     return mktime(timestruct);
   else
     return timegm(timestruct);
 }
@@ skipping 167 matching lines @@
   struct tm timestruct;
   timestruct.tm_sec = exploded.second;
   timestruct.tm_min = exploded.minute;
   timestruct.tm_hour = exploded.hour;
   timestruct.tm_mday = exploded.day_of_month;
   timestruct.tm_mon = month.ValueOrDie();
   timestruct.tm_year = year.ValueOrDie();
   timestruct.tm_wday = exploded.day_of_week;  // mktime/timegm ignore this
   timestruct.tm_yday = 0;                     // mktime/timegm ignore this
   timestruct.tm_isdst = -1;                   // attempt to figure it out
-#if !defined(OS_NACL) && !defined(OS_SOLARIS)
+#if !defined(OS_NACL) && !defined(OS_SOLARIS) && !defined(OS_AIX)
   timestruct.tm_gmtoff = 0;   // not a POSIX field, so mktime/timegm ignore
   timestruct.tm_zone = NULL;  // not a POSIX field, so mktime/timegm ignore
 #endif
 
   SysTime seconds;
 
   // Certain exploded dates do not really exist due to daylight saving times,
   // and this causes mktime() to return implementation-defined values when
   // tm_isdst is set to -1. On Android, the function will return -1, while the
   // C libraries of other platforms typically return a liberally-chosen value.
@@ skipping 158 matching lines @@
     result.tv_usec = static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1;
     return result;
   }
   int64_t us = us_ - kTimeTToMicrosecondsOffset;
   result.tv_sec = us / Time::kMicrosecondsPerSecond;
   result.tv_usec = us % Time::kMicrosecondsPerSecond;
   return result;
 }
 
 }  // namespace base