| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Test for access to file, relative to open directory. Hurd version. |
| 2 | Copyright (C) 2006-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <fcntl.h> |
| 21 | #include <stddef.h> |
| 22 | #include <unistd.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <hurd.h> |
| 25 | #include <hurd/fd.h> |
| 26 | |
| 27 | int |
| 28 | faccessat (int fd, const char *file, int type, int flag) |
| 29 | { |
| 30 | error_t err; |
| 31 | file_t port; |
| 32 | int allowed, flags; |
| 33 | |
| 34 | if ((flag & AT_EACCESS) == 0) |
| 35 | { |
| 36 | if (fd == AT_FDCWD || file[0] == '/') |
| 37 | return __access (file, type); |
| 38 | __set_errno (ENOTSUP); /* XXX later */ |
| 39 | return -1; |
| 40 | } |
| 41 | |
| 42 | port = __file_name_lookup_at (fd, flag &~ AT_EACCESS, file, 0, 0); |
| 43 | if (port == MACH_PORT_NULL) |
| 44 | return -1; |
| 45 | |
| 46 | /* Find out what types of access we are allowed to this file. */ |
| 47 | err = __file_check_access (port, &allowed); |
| 48 | __mach_port_deallocate (__mach_task_self (), port); |
| 49 | if (err) |
| 50 | return __hurd_fail (err); |
| 51 | |
| 52 | flags = 0; |
| 53 | if (type & R_OK) |
| 54 | flags |= O_READ; |
| 55 | if (type & W_OK) |
| 56 | flags |= O_WRITE; |
| 57 | if (type & X_OK) |
| 58 | flags |= O_EXEC; |
| 59 | |
| 60 | if (flags & ~allowed) |
| 61 | /* We are not allowed all the requested types of access. */ |
| 62 | return __hurd_fail (EACCES); |
| 63 | |
| 64 | return 0; |
| 65 | } |