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-rw-r--r--libc/sysdeps/linux/common/fchmodat.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/fchmodat.c b/libc/sysdeps/linux/common/fchmodat.c
index 7d4dd4e2c..8224a528a 100644
--- a/libc/sysdeps/linux/common/fchmodat.c
+++ b/libc/sysdeps/linux/common/fchmodat.c
@@ -2,15 +2,36 @@
* fchmodat() for uClibc
*
* Copyright (C) 2009 Analog Devices Inc.
+ * Copyright (C) 2012 Mike Frysinger
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
+#include <fcntl.h>
#include <sys/syscall.h>
#include <sys/stat.h>
#ifdef __NR_fchmodat
-_syscall4(int, fchmodat, int, fd, const char *, file, mode_t, mode, int, flag)
+/*
+ * The kernel takes 3 args, but userland takes 4.
+ * We have to process all the flags ourselves.
+ */
+int fchmodat(int fd, const char *file, mode_t mode, int flag)
+{
+ /* We only support one flag atm ... */
+ if (flag & ~AT_SYMLINK_NOFOLLOW) {
+ __set_errno(EINVAL);
+ return -1;
+ }
+
+ /* ... but Linux doesn't support perms on symlinks. */
+ if (flag & AT_SYMLINK_NOFOLLOW) {
+ __set_errno(ENOTSUP);
+ return -1;
+ }
+
+ return INLINE_SYSCALL(fchmodat, 3, fd, file, mode);
+}
#else
/* should add emulation with fchmod() and /proc/self/fd/ ... */
#endif