-#ifndef _SYS_TIME_H_
-#define _SYS_TIME_H_
+/*
+ * sys/time.h
+ *
+ * Time type definitions pertaining to system timer and clock APIs
+ *
+ *
+ * $Id$
+ *
+ * Written by Danny Smith <dannysmith@users.sourceforge.net>
+ * Copyright (C) 2002, 2004, 2006, 2007, 2017, MinGW.org Project
+ *
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+#ifndef _SYS_TIME_H
+#pragma GCC system_header
+
+#ifndef __WINSOCK_H_SOURCED__
+#define _SYS_TIME_H
+
+/* FIXME: Do we need to do this? There's nothing here which
+ * explicitly requires it; are users entitled to assume that
+ * including <sys/time.h> will also expose all of <time.h>?
+ * (If not <time.h>, we do need <_mingw.h> instead).
+ */
#include <time.h>
-#ifdef __cplusplus
-extern "C" {
-#endif
+_BEGIN_C_DECLS
-#ifndef _TIMEVAL_DEFINED /* also in winsock[2].h */
-#define _TIMEVAL_DEFINED
-struct timeval {
- long tv_sec;
- long tv_usec;
-};
-#define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
-#define timercmp(tvp, uvp, cmp) \
- (((tvp)->tv_sec != (uvp)->tv_sec) ? \
- ((tvp)->tv_sec cmp (uvp)->tv_sec) : \
- ((tvp)->tv_usec cmp (uvp)->tv_usec))
-#define timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
-#endif /* _TIMEVAL_DEFINED */
-
-/* Provided for compatibility with code that assumes that
- the presence of gettimeofday function implies a definition
- of struct timezone. */
-struct timezone
-{
- int tz_minuteswest; /* of Greenwich */
- int tz_dsttime; /* type of dst correction to apply */
+#endif /* !__WINSOCK_H_SOURCED__ */
+
+#if ! (defined _SYS_TIME_H && defined _WINSOCK_H)
+/* The following definitions must be exposed both when <sys/time.h>
+ * is included in its own right, and when it is included selectively
+ * on behalf of <winsock.h>, but they must not be processed twice.
+ */
+struct timeval
+{ /* Nominally a BSD or POSIX.1 structure, (with tv_sec declared as
+ * time_t), but subverted by Microsoft with tv_sec declared as long,
+ * to avoid __time32_t vs. __time64_t ambiguity; (tv_sec is ALWAYS
+ * a 32-bit entity in Windows' use of this structure). Addionally,
+ * POSIX.1-2001 mandates that tv_usec should be suseconds_t, (which
+ * is nominally an alias for long), but we retain long to maintain
+ * consistency with Microsoft usage.
+ */
+ long tv_sec; /* whole number of seconds in interval */
+ long tv_usec; /* additional fraction as microseconds */
};
-/*
- Implementation as per:
- The Open Group Base Specifications, Issue 6
- IEEE Std 1003.1, 2004 Edition
+/* FIXME: The following convenience macros, for manipulating data in
+ * timeval structures, are derived from BSD; they are neither standard
+ * in Windows code, nor specified in POSIX.1, but have been adopted by
+ * GNU. Consider making them dependent on _BSD_SOURCE or _GNU_SOURCE
+ * feature test filters, (but note that <winsock.h> must be able to
+ * expose timerclear, timerisset, and timercmp, regardless of the
+ * order in which <sys/time.h> and <winsock.h> are included).
+ */
+#define timerclear( tvp ) (tvp)->tv_sec = (tvp)->tv_usec = 0
+#define timerisset( tvp ) ((tvp)->tv_sec || (tvp)->tv_usec)
+
+#define timercmp( tvp, uvp, cmp ) (((tvp)->tv_sec != (uvp)->tv_sec) \
+ ? ((tvp)->tv_sec cmp (uvp)->tv_sec) \
+ : ((tvp)->tv_usec cmp (uvp)->tv_usec))
+
+#endif /* ! (_SYS_TIME_H && _WINSOCK_H) */
- The timezone pointer arg is ignored. Errors are ignored.
-*/
-int __cdecl __MINGW_NOTHROW gettimeofday(struct timeval *__restrict__,
- void *__restrict__ /* tzp (unused) */);
+#ifdef _SYS_TIME_H
+struct timezone
+{ /* FIXME: Deprecate this...
+ * Provided for compatibility with code that assumes that the
+ * presence of the gettimeofday() function implies that it may
+ * be safely assumed that a definition of struct timezone will
+ * also be provided. This is an obsolete derivative from BSD;
+ * DO NOT USE IT!
+ */
+ int tz_minuteswest; /* of the Greenwich meridian */
+ int tz_dsttime; /* type of DST correction to apply */
+};
-#ifdef __cplusplus
-}
-#endif
+/* Declaration of POSIX.1 compatible gettimeofday() function:
+ *
+ * Implementation per POSIX.1-1996, (declared obsolescent in POSIX.1-2008),
+ * as described in the Open Group Base Specification, Issue 7, which is also
+ * designated as IEEE Std 1003.1, 2016 Edition; the struct timezone pointer
+ * argument of some Unix implementations (declared as a pointer to void in
+ * POSIX.1) is ignored, as are all error conditions.
+ *
+ * FIXME: Deprecate this for _POSIX_C_SOURCE >= 200809L
+ */
+int __cdecl __MINGW_NOTHROW gettimeofday
+(struct timeval *__restrict__, void *__restrict__ /* tzp (unused) */);
+_END_C_DECLS
-#endif /* _SYS_TIME_H_ */
+#endif /* _SYS_TIME_H */
+#endif /* !_SYS_TIME_H: $RCSfile$: end of file */
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