| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2002, 2004 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 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, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #include <errno.h> |
| 21 | #include <semaphore.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <unistd.h> |
| 25 | #include "semaphoreP.h" |
| 26 | |
| 27 | |
| 28 | int |
| 29 | sem_unlink ( |
| 30 | const char *name) |
| 31 | { |
| 32 | char *fname; |
| 33 | size_t namelen; |
| 34 | |
| 35 | /* Determine where the shmfs is mounted. */ |
| 36 | INTUSE(__pthread_once) (&__namedsem_once, __where_is_shmfs); |
| 37 | |
| 38 | /* If we don't know the mount points there is nothing we can do. Ever. */ |
| 39 | if (mountpoint.dir == NULL) |
| 40 | { |
| 41 | __set_errno (ENOSYS); |
| 42 | return -1; |
| 43 | } |
| 44 | |
| 45 | /* Construct the filename. */ |
| 46 | while (name[0] == '/') |
| 47 | ++name; |
| 48 | |
| 49 | if (name[0] == '\0') |
| 50 | { |
| 51 | /* The name "/" is not supported. */ |
| 52 | __set_errno (ENOENT); |
| 53 | return -1; |
| 54 | } |
| 55 | namelen = strlen (name); |
| 56 | |
| 57 | /* Create the name of the file. */ |
| 58 | fname = (char *) alloca (mountpoint.dirlen + namelen + 1); |
| 59 | mempcpy (mempcpy (fname, mountpoint.dir, mountpoint.dirlen), |
| 60 | name, namelen + 1); |
| 61 | |
| 62 | /* Now try removing it. */ |
| 63 | int ret = unlink (fname); |
| 64 | if (ret < 0 && errno == EPERM) |
| 65 | __set_errno (EACCES); |
| 66 | return ret; |
| 67 | } |