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From:   Mark Brown <broonie@kernel.org>
To:     Willy Tarreau <w@1wt.eu>
Cc:     linux-kernel@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH v2] tools/nolibc: Implement msleep()
Date:   Wed, 12 May 2021 12:47:28 +0100
Message-Id: <20210512114728.19015-1-broonie@kernel.org>
MIME-Version: 1.0
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Allow users to implement shorter delays than a full second by implementing
msleep().

Signed-off-by: Mark Brown <broonie@kernel.org>
---

v2:
 - Support delays of more than a second.
 - Return the number of seconds remaining if the delay does not
   complete.

 tools/include/nolibc/nolibc.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index 8b7a9830dd22..01400d36ce99 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -2243,6 +2243,17 @@ unsigned int sleep(unsigned int seconds)
 		return 0;
 }
 
+static __attribute__((unused))
+int msleep(unsigned int msecs)
+{
+	struct timeval my_timeval = { msecs / 1000, (msecs % 1000) * 1000 };
+
+	if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
+		return my_timeval.tv_sec + !!my_timeval.tv_usec;
+	else
+		return 0;
+}
+
 static __attribute__((unused))
 int stat(const char *path, struct stat *buf)
 {
-- 
2.20.1