Split out time-related evutil functions into a new evutil_time.c

1 files changed, 134 insertions, 0 deletions

diff --git a/evutil_time.c b/evutil_time.c
new file mode 100644
index 00000000..967fcbe6
--- /dev/null
+++ b/evutil_time.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
+ *
+ * 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
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "event2/event-config.h"
+#include "evconfig-private.h"
+
+#ifdef _WIN32
+#include <winsock2.h>
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#endif
+
+#include <sys/types.h>
+#ifdef EVENT__HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#include <errno.h>
+#include <limits.h>
+#ifndef EVENT__HAVE_GETTIMEOFDAY
+#include <sys/timeb.h>
+#endif
+#if !defined(EVENT__HAVE_NANOSLEEP) && !defined(EVENT_HAVE_USLEEP) && \
+	!defined(_WIN32)
+#include <sys/select.h>
+#endif
+#include <time.h>
+#include <sys/stat.h>
+
+#include "event2/util.h"
+#include "util-internal.h"
+#include "log-internal.h"
+
+#ifndef EVENT__HAVE_GETTIMEOFDAY
+/* No gettimeofday; this must be windows. */
+int
+evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+#ifdef _MSC_VER
+#define U64_LITERAL(n) n##ui64
+#else
+#define U64_LITERAL(n) n##llu
+#endif
+
+	/* Conversion logic taken from Tor, which in turn took it
+	 * from Perl.  GetSystemTimeAsFileTime returns its value as
+	 * an unaligned (!) 64-bit value containing the number of
+	 * 100-nanosecond intervals since 1 January 1601 UTC. */
+#define EPOCH_BIAS U64_LITERAL(116444736000000000)
+#define UNITS_PER_SEC U64_LITERAL(10000000)
+#define USEC_PER_SEC U64_LITERAL(1000000)
+#define UNITS_PER_USEC U64_LITERAL(10)
+	union {
+		FILETIME ft_ft;
+		ev_uint64_t ft_64;
+	} ft;
+
+	if (tv == NULL)
+		return -1;
+
+	GetSystemTimeAsFileTime(&ft.ft_ft);
+
+	if (EVUTIL_UNLIKELY(ft.ft_64 < EPOCH_BIAS)) {
+		/* Time before the unix epoch. */
+		return -1;
+	}
+	ft.ft_64 -= EPOCH_BIAS;
+	tv->tv_sec = (long) (ft.ft_64 / UNITS_PER_SEC);
+	tv->tv_usec = (long) ((ft.ft_64 / UNITS_PER_USEC) % USEC_PER_SEC);
+	return 0;
+}
+#endif
+
+#define MAX_SECONDS_IN_MSEC_LONG \
+	(((LONG_MAX) - 999) / 1000)
+
+long
+evutil_tv_to_msec_(const struct timeval *tv)
+{
+	if (tv->tv_usec > 1000000 || tv->tv_sec > MAX_SECONDS_IN_MSEC_LONG)
+		return -1;
+
+	return (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
+}
+
+void
+evutil_usleep_(const struct timeval *tv)
+{
+	if (!tv)
+		return;
+#if defined(_WIN32)
+	{
+		long msec = evutil_tv_to_msec_(tv);
+		Sleep((DWORD)msec);
+	}
+#elif defined(EVENT__HAVE_NANOSLEEP)
+	{
+		struct timespec ts;
+		ts.tv_sec = tv->tv_sec;
+		ts.tv_nsec = tv->tv_usec*1000;
+		nanosleep(&ts, NULL);
+	}
+#elif defined(EVENT__HAVE_USLEEP)
+	/* Some systems don't like to usleep more than 999999 usec */
+	sleep(tv->tv_sec);
+	usleep(tv->tv_usec);
+#else
+	select(0, NULL, NULL, NULL, tv);
+#endif
+}
+