72 lines
1.2 KiB
C
72 lines
1.2 KiB
C
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/*
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* timegm shims based on example code from in the glibc timegm manpage.
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*
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* These should be replaced with lockless versions that do not require
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* modifying global state.
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*/
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#include <time.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef _WIN32
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#include <windows.h>
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time_t
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timegm(struct tm *tm)
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{
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time_t ret;
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char *tz, *buf;
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static volatile HANDLE mtx = NULL;
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if (!mtx) {
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HANDLE p = CreateMutex(NULL, FALSE, NULL);
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if (InterlockedCompareExchangePointer(
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(void **)&mtx, (void *)p, NULL))
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CloseHandle(p);
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}
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WaitForSingleObject(mtx, INFINITE);
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tz = getenv("TZ");
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if (tz) {
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if (asprintf(&buf, "TZ=%s", tz) == -1)
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buf = NULL;
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}
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putenv("TZ=UTC");
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tzset();
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ret = mktime(tm);
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if (buf) {
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putenv(buf);
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free(buf);
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} else
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putenv("TZ=");
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tzset();
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ReleaseMutex(mtx);
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return ret;
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}
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#else
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#include <pthread.h>
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time_t
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timegm(struct tm *tm)
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{
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time_t ret;
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char *tz;
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static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
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pthread_mutex_lock(&mtx);
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tz = getenv("TZ");
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if (tz)
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tz = strdup(tz);
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setenv("TZ", "", 1);
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tzset();
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ret = mktime(tm);
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if (tz) {
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setenv("TZ", tz, 1);
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free(tz);
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} else
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unsetenv("TZ");
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tzset();
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pthread_mutex_unlock(&mtx);
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return ret;
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}
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#endif
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