From e4bbf18b3fc5d04509a19b665446ea8f69ca61dc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <korli@users.berlios.de>
Date: Tue, 25 Sep 2007 19:18:27 +0000
Subject: [PATCH] added an implementation for nanosleep() based on snooze()

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22311 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 headers/posix/time.h                      |  1 +
 src/system/libroot/posix/time/Jamfile     |  1 +
 src/system/libroot/posix/time/nanosleep.c | 35 +++++++++++++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 src/system/libroot/posix/time/nanosleep.c

diff --git a/headers/posix/time.h b/headers/posix/time.h
index ae8ce3f100..aa5be1b204 100644
--- a/headers/posix/time.h
+++ b/headers/posix/time.h
@@ -67,6 +67,7 @@ extern struct tm	*gmtime(const time_t *timer);
 extern struct tm	*gmtime_r(const time_t *timer, struct tm *tm); 
 extern struct tm	*localtime(const time_t *timer);
 extern struct tm	*localtime_r(const time_t *timer, struct tm *tm);
+extern int			nanosleep(const struct timespec *, struct timespec *);
 extern size_t		strftime(char *buffer, size_t maxSize, const char *format,
 						const struct tm *tm);
 extern char 		*strptime(const char *buf, const char *format, struct tm *tm);
diff --git a/src/system/libroot/posix/time/Jamfile b/src/system/libroot/posix/time/Jamfile
index b1de2b4a73..c451ccd1eb 100644
--- a/src/system/libroot/posix/time/Jamfile
+++ b/src/system/libroot/posix/time/Jamfile
@@ -12,6 +12,7 @@ MergeObject posix_time.o :
 	ctime.c
 	difftime.c
 	localtime.c
+	nanosleep.c
 	stime.c
 	strftime.c
 	strptime.c
diff --git a/src/system/libroot/posix/time/nanosleep.c b/src/system/libroot/posix/time/nanosleep.c
new file mode 100644
index 0000000000..2f7a0cb9d2
--- /dev/null
+++ b/src/system/libroot/posix/time/nanosleep.c
@@ -0,0 +1,35 @@
+/* 
+** Copyright 2007, Jérôme Duval. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+#include <errno.h>
+#include <time.h>
+#include <OS.h>
+
+int
+nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
+{
+	bigtime_t ms, begin_ms;
+	status_t err;
+
+	if (!rqtp) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	// round up tv_nsec
+	ms = rqtp->tv_sec * 1000000LL + (rqtp->tv_nsec + 999) / 1000;
+	begin_ms = system_time();
+	err = snooze(ms);
+	if (err == B_INTERRUPTED) {
+		errno = EINTR;
+		if (rmtp) {
+			bigtime_t remain_ms = ms - system_time() + begin_ms;
+			rmtp->tv_sec = remain_ms / 1000000;
+			rmtp->tv_nsec = (remain_ms - rmtp->tv_sec) * 1000;
+		}
+		return -1;
+	}
+	return 0;
+}
+