| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Common database routines for nss_db. |
| 2 | Copyright (C) 2000-2016 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 <dlfcn.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <unistd.h> |
| 25 | #include <sys/mman.h> |
| 26 | #include <not-cancel.h> |
| 27 | |
| 28 | #include "nss_db.h" |
| 29 | |
| 30 | /* Open the database stored in FILE. If succesful, store either a |
| 31 | pointer to the mapped file or a file handle for the file in H and |
| 32 | return NSS_STATUS_SUCCESS. On failure, return the appropriate |
| 33 | lookup status. */ |
| 34 | enum nss_status |
| 35 | internal_setent (const char *file, struct nss_db_map *mapping) |
| 36 | { |
| 37 | enum nss_status status = NSS_STATUS_UNAVAIL; |
| 38 | |
| 39 | int mode = O_RDONLY | O_LARGEFILE; |
| 40 | #ifdef O_CLOEXEC |
| 41 | mode |= O_CLOEXEC; |
| 42 | #endif |
| 43 | int fd = open_not_cancel_2 (file, mode); |
| 44 | if (fd != -1) |
| 45 | { |
| 46 | struct nss_db_header header; |
| 47 | |
| 48 | if (read (fd, &header, sizeof (header)) == sizeof (header)) |
| 49 | { |
| 50 | mapping->header = mmap (NULL, header.allocate, PROT_READ, |
| 51 | MAP_PRIVATE, fd, 0); |
| 52 | mapping->len = header.allocate; |
| 53 | if (mapping->header != MAP_FAILED) |
| 54 | status = NSS_STATUS_SUCCESS; |
| 55 | else if (errno == ENOMEM) |
| 56 | status = NSS_STATUS_TRYAGAIN; |
| 57 | } |
| 58 | |
| 59 | close_not_cancel_no_status (fd); |
| 60 | } |
| 61 | |
| 62 | return status; |
| 63 | } |
| 64 | |
| 65 | |
| 66 | /* Close the database. */ |
| 67 | void |
| 68 | internal_endent (struct nss_db_map *mapping) |
| 69 | { |
| 70 | munmap (mapping->header, mapping->len); |
| 71 | } |