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100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/* Copyright (C) 1991, 1995, 1996, 1998, 2000 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <sys/statfs.h>
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#include <linux_fsinfo.h>
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/* The Linux kernel header mentioned this as a kind of generic value. */
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#define LINUX_LINK_MAX 127
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static long int default_pathconf (const char *path, int name);
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/* Get file-specific information about PATH. */
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long int
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__pathconf (const char *path, int name)
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{
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if (name == _PC_FILESIZEBITS)
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{
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/* Test whether this is on a ext2 or UFS filesystem which
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support large files. */
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struct statfs fs;
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if (__statfs (path, &fs) < 0
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|| (fs.f_type != EXT2_SUPER_MAGIC
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&& fs.f_type != UFS_MAGIC
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&& fs.f_type != UFS_CIGAM))
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return 32;
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/* This filesystem supported files >2GB. */
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return 64;
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}
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if (name == _PC_LINK_MAX)
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{
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struct statfs fsbuf;
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/* Determine the filesystem type. */
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if (__statfs (path, &fsbuf) < 0)
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/* not possible, return the default value. */
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return LINUX_LINK_MAX;
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switch (fsbuf.f_type)
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{
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case EXT2_SUPER_MAGIC:
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return EXT2_LINK_MAX;
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case MINIX_SUPER_MAGIC:
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case MINIX_SUPER_MAGIC2:
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return MINIX_LINK_MAX;
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case MINIX2_SUPER_MAGIC:
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case MINIX2_SUPER_MAGIC2:
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return MINIX2_LINK_MAX;
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case XENIX_SUPER_MAGIC:
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return XENIX_LINK_MAX;
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case SYSV4_SUPER_MAGIC:
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case SYSV2_SUPER_MAGIC:
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return SYSV_LINK_MAX;
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case COH_SUPER_MAGIC:
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return COH_LINK_MAX;
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case UFS_MAGIC:
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case UFS_CIGAM:
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return UFS_LINK_MAX;
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default:
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return LINUX_LINK_MAX;
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}
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}
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/* Fallback to the generic version. */
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return default_pathconf (path, name);
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}
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#define __pathconf static default_pathconf
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#include <sysdeps/posix/pathconf.c>
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