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glibc/misc/mntent.c
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/* Utilities for reading/writing fstab, mtab, etc. | |
Copyright (C) 1995-2016 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 <mntent.h> | |
#include <stdlib.h> | |
#include <libc-lock.h> | |
/* We don't want to allocate the static buffer all the time since it | |
is not always used (in fact, rather infrequently). Accept the | |
extra cost of a `malloc'. */ | |
libc_freeres_ptr (static char *getmntent_buffer); | |
/* This is the size of the buffer. This is really big. */ | |
#define BUFFER_SIZE 4096 | |
static void | |
allocate (void) | |
{ | |
getmntent_buffer = (char *) malloc (BUFFER_SIZE); | |
} | |
struct mntent * | |
getmntent (FILE *stream) | |
{ | |
static struct mntent m; | |
__libc_once_define (static, once); | |
__libc_once (once, allocate); | |
if (getmntent_buffer == NULL) | |
/* If no core is available we don't have a chance to run the | |
program successfully and so returning NULL is an acceptable | |
result. */ | |
return NULL; | |
return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE); | |
} |