1 /*
2 * fchmodat() for uClibc
3 *
4 * Copyright (C) 2009 Analog Devices Inc.
5 * Copyright (C) 2012 Mike Frysinger
6 *
7 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
8 */
9
10 #include <fcntl.h>
11 #include <sys/syscall.h>
12 #include <sys/stat.h>
13
14 #ifdef __NR_fchmodat
15 /*
16 * The kernel takes 3 args, but userland takes 4.
17 * We have to process all the flags ourselves.
18 */
fchmodat(int fd,const char * file,mode_t mode,int flag)19 int fchmodat(int fd, const char *file, mode_t mode, int flag)
20 {
21 /* We only support one flag atm ... */
22 if (flag & ~AT_SYMLINK_NOFOLLOW) {
23 __set_errno(EINVAL);
24 return -1;
25 }
26
27 /* ... but Linux doesn't support perms on symlinks. */
28 if (flag & AT_SYMLINK_NOFOLLOW) {
29 __set_errno(ENOTSUP);
30 return -1;
31 }
32
33 return INLINE_SYSCALL(fchmodat, 3, fd, file, mode);
34 }
35 libc_hidden_def(fchmodat)
36 #else
37 /* should add emulation with fchmod() and /proc/self/fd/ ... */
38 #endif
39