[tip: core/rcu] tools/nolibc: Add the definition for dup()

[tip-bot2 for Willy Tarreau]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     c261145abd2461f921ac44ad70c28778dda710f4
Gitweb:        https://git.kernel.org/tip/c261145abd2461f921ac44ad70c28778dda710f4
Author:        Willy Tarreau <w@xxxxxx>
AuthorDate:    Thu, 21 Jan 2021 08:20:23 +01:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Thu, 21 Jan 2021 10:06:44 -08:00

tools/nolibc: Add the definition for dup()

This commit adds the dup() function, which was omitted when sys_dup()
was defined.  This is a port of nolibc's upstream commit 47cc42a79c92
to the Linux kernel.

Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc")
Tested-by: Valentin Schneider <valentin.schneider@xxxxxxx>
Tested-by: Mark Rutland <mark.rutland@xxxxxxx> [arm64]
Signed-off-by: Willy Tarreau <w@xxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 tools/include/nolibc/nolibc.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index e61d36c..3115c64 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -1853,6 +1853,18 @@ int close(int fd)
 }
 
 static __attribute__((unused))
+int dup(int fd)
+{
+	int ret = sys_dup(fd);
+
+	if (ret < 0) {
+		SET_ERRNO(-ret);
+		ret = -1;
+	}
+	return ret;
+}
+
+static __attribute__((unused))
 int dup2(int old, int new)
 {
 	int ret = sys_dup2(old, new);