linux-kernel - [PATCH nolibc 38/61] tools/nolibc/unistd: add usleep()

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Message-Id: <20220419004225.3952530-38-paulmck@kernel.org>
Date:   Mon, 18 Apr 2022 17:42:02 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     gwml@...r.gnuweeb.org, kernel-team@...com, w@....eu,
        Willy Tarreau <w@....eu>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH nolibc 38/61] tools/nolibc/unistd: add usleep()

From: Willy Tarreau <w@....eu>

This call is trivial to implement based on select() to complete sleep()
and msleep(), let's add it.

Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/unistd.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/include/nolibc/unistd.h b/tools/include/nolibc/unistd.h
index 87b448ff2191..1c25e20ee360 100644
--- a/tools/include/nolibc/unistd.h
+++ b/tools/include/nolibc/unistd.h
@@ -37,6 +37,14 @@ unsigned int sleep(unsigned int seconds)
 		return 0;
 }
 
+static __attribute__((unused))
+int usleep(unsigned int usecs)
+{
+	struct timeval my_timeval = { usecs / 1000000, usecs % 1000000 };
+
+	return sys_select(0, 0, 0, 0, &my_timeval);
+}
+
 static __attribute__((unused))
 int tcsetpgrp(int fd, pid_t pid)
 {
-- 
2.31.1.189.g2e36527f23