Add reentrant versions of ctime, localtime, gmtime, asctime.

These cannot be implemented platform-independent, so we fall back to the native
non-reentrant versions, but lock during each access (only if ZTS is used).

To initialize/destroy the used data structures, you need to call
reentrancy_startup() before sapi_startup(), and reentrancy_shutdown() after
sapi_shutdown().

1 files changed, 53 insertions, 0 deletions

diff --git a/main/php_reentrancy.h b/main/php_reentrancy.h
new file mode 100644
index 0000000000..942a27bca3
--- /dev/null
+++ b/main/php_reentrancy.h
@@ -0,0 +1,53 @@
+#ifndef PHP_REENTRANCY_H
+#define PHP_REENTRANCY_H
+
+#include "php_config.h"
+
+#include <time.h>
+
+/* currently, PHP does not check for these functions, but assumes
+   that they are available on all systems. */
+
+#define HAVE_LOCALTIME 1
+#define HAVE_GMTIME 1
+#define HAVE_ASCTIME 1
+#define HAVE_CTIME 1
+
+
+#if !defined(HAVE_LOCALTIME_R) && defined(HAVE_LOCALTIME)
+#define PHP_NEED_REENTRANCY 1
+#define localtime_r php_localtime_r
+struct tm *localtime_r(const time_t *const timep, struct tm *p_tm);
+#endif
+
+
+#if !defined(HAVE_CTIME_R) && defined(HAVE_CTIME)
+#define PHP_NEED_REENTRANCY 1
+#define ctime_r php_ctime_r
+char *ctime_r(const time_t *clock, char *buf);
+#endif
+
+
+#if !defined(HAVE_ASCTIME_R) && defined(HAVE_ASCTIME)
+#define PHP_NEED_REENTRANCY 1
+#define asctime_r php_asctime_r
+char *asctime_r(const struct tm *tm, char *buf);
+#endif
+
+
+#if !defined(HAVE_GMTIME_R) && defined(HAVE_GMTIME)
+#define PHP_NEED_REENTRANCY 1
+#define gmtime_r php_gmtime_r
+struct tm *gmtime_r(const time_t *const timep, struct tm *p_tm);
+#endif
+
+
+#if defined(ZTS) && defined(PHP_NEED_REENTRANCY)
+void reentrancy_startup(void);
+void reentrancy_shutdown(void);
+#else
+#define reentrancy_startup()
+#define reentrancy_shutdown()
+#endif
+
+#endif