[PATCH 1/2] support: Add the xfchdir function

[Florian Weimer <fweimer@redhat.com>]

---
 support/Makefile  |  1 +
 support/xfchdir.c | 28 ++++++++++++++++++++++++++++
 support/xunistd.h |  1 +
 3 files changed, 30 insertions(+)
 create mode 100644 support/xfchdir.c

diff --git a/support/Makefile b/support/Makefile
index 4046b12fbd..2937316851 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -119,6 +119,7 @@ libsupport-routines = \
   xdlfcn \
   xdlmopen \
   xdup2 \
+  xfchdir \
   xfchmod \
   xfclose \
   xfopen \
diff --git a/support/xfchdir.c b/support/xfchdir.c
new file mode 100644
index 0000000000..602138a2ae
--- /dev/null
+++ b/support/xfchdir.c
@@ -0,0 +1,28 @@
+/* fchdir with error checking.
+   Copyright (C) 2017-2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/check.h>
+#include <support/xunistd.h>
+#include <sys/stat.h>
+
+void
+xfchdir (int fd)
+{
+  if (fchdir (fd) != 0)
+    FAIL_EXIT1 ("fchdir (%d): %m", fd);
+}
diff --git a/support/xunistd.h b/support/xunistd.h
index 960a62d412..47137152a8 100644
--- a/support/xunistd.h
+++ b/support/xunistd.h
@@ -59,6 +59,7 @@ long long xlseek (int fd, long long offset, int whence);
 void xftruncate (int fd, long long length);
 void xsymlink (const char *target, const char *linkpath);
 void xchdir (const char *path);
+void xfchdir (int);
 void xfchmod (int fd, mode_t mode);
 void xchmod (const char *pathname, mode_t mode);
 void xmkfifo (const char *pathname, mode_t mode);
-- 
2.37.3