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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Common database routines for nss_db.
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Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <dlfcn.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <not-cancel.h>
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#include "nss_db.h"
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/* Open the database stored in FILE. If succesful, store either a
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pointer to the mapped file or a file handle for the file in H and
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return NSS_STATUS_SUCCESS. On failure, return the appropriate
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lookup status. */
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enum nss_status
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internal_setent (const char *file, struct nss_db_map *mapping)
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{
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enum nss_status status = NSS_STATUS_UNAVAIL;
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int fd = open_not_cancel_2 (file, O_RDONLY | O_LARGEFILE | O_CLOEXEC);
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if (fd != -1)
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{
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struct nss_db_header header;
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if (read (fd, &header, sizeof (header)) == sizeof (header))
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{
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mapping->header = mmap (NULL, header.allocate, PROT_READ,
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MAP_PRIVATE, fd, 0);
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mapping->len = header.allocate;
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if (mapping->header != MAP_FAILED)
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status = NSS_STATUS_SUCCESS;
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else if (errno == ENOMEM)
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status = NSS_STATUS_TRYAGAIN;
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}
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close_not_cancel_no_status (fd);
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}
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return status;
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}
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/* Close the database. */
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void
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internal_endent (struct nss_db_map *mapping)
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{
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munmap (mapping->header, mapping->len);
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}
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