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glibc/nss/nss_db/db-open.c
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/* Common database routines for nss_db. | |
Copyright (C) 2000-2014 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <dlfcn.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <sys/mman.h> | |
#include <not-cancel.h> | |
#include "nss_db.h" | |
/* Open the database stored in FILE. If succesful, store either a | |
pointer to the mapped file or a file handle for the file in H and | |
return NSS_STATUS_SUCCESS. On failure, return the appropriate | |
lookup status. */ | |
enum nss_status | |
internal_setent (const char *file, struct nss_db_map *mapping) | |
{ | |
enum nss_status status = NSS_STATUS_UNAVAIL; | |
int mode = O_RDONLY | O_LARGEFILE; | |
#ifdef O_CLOEXEC | |
mode |= O_CLOEXEC; | |
#endif | |
int fd = open_not_cancel_2 (file, mode); | |
if (fd != -1) | |
{ | |
struct nss_db_header header; | |
if (read (fd, &header, sizeof (header)) == sizeof (header)) | |
{ | |
mapping->header = mmap (NULL, header.allocate, PROT_READ, | |
MAP_PRIVATE, fd, 0); | |
mapping->len = header.allocate; | |
if (mapping->header != MAP_FAILED) | |
status = NSS_STATUS_SUCCESS; | |
else if (errno == ENOMEM) | |
status = NSS_STATUS_TRYAGAIN; | |
} | |
close_not_cancel_no_status (fd); | |
} | |
return status; | |
} | |
/* Close the database. */ | |
void | |
internal_endent (struct nss_db_map *mapping) | |
{ | |
munmap (mapping->header, mapping->len); | |
} |