| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 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 | */ |
| 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 | #else |
| 36 | /* should add emulation with fchmod() and /proc/self/fd/ ... */ |
| 37 | #endif |