301 lines
6.0 KiB
C
301 lines
6.0 KiB
C
/* Linux specific extensions to pathconf.
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Copyright (C) 1991,95,96,98,99,2000,2001 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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/* Modified for newlib July 19, 2002 - Jeff Johnston */
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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/stat.h>
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#include <sys/statfs.h>
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#include <sys/statvfs.h>
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#include <machine/weakalias.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 posix_pathconf (const char *path, int name);
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/* Get file-specific information about descriptor FD. */
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long int
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__pathconf (path, name)
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const char *path;
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int name;
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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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{
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if (errno == ENOSYS)
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/* not possible, return the default value. */
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return LINUX_LINK_MAX;
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/* Some error occured. */
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return -1;
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}
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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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case REISERFS_SUPER_MAGIC:
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return REISERFS_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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return posix_pathconf (path, name);
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}
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/* Get file-specific information about PATH. */
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static long int
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posix_pathconf (const char *path, int name)
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{
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if (path[0] == '\0')
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{
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__set_errno (ENOENT);
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return -1;
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}
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switch (name)
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{
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default:
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__set_errno (EINVAL);
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return -1;
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case _PC_LINK_MAX:
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#ifdef LINK_MAX
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return LINK_MAX;
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#else
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return -1;
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#endif
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case _PC_MAX_CANON:
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#ifdef MAX_CANON
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return MAX_CANON;
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#else
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return -1;
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#endif
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case _PC_MAX_INPUT:
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#ifdef MAX_INPUT
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return MAX_INPUT;
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#else
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return -1;
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#endif
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case _PC_NAME_MAX:
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#ifdef NAME_MAX
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{
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struct statfs buf;
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int save_errno = errno;
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if (__statfs (path, &buf) < 0)
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{
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if (errno == ENOSYS)
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{
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errno = save_errno;
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return NAME_MAX;
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}
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return -1;
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}
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else
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{
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#ifdef _STATFS_F_NAMELEN
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return buf.f_namelen;
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#else
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# ifdef _STATFS_F_NAME_MAX
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return buf.f_name_max;
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# else
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return NAME_MAX;
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# endif
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#endif
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}
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}
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#else
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return -1;
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#endif
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case _PC_PATH_MAX:
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#ifdef PATH_MAX
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return PATH_MAX;
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#else
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return -1;
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#endif
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case _PC_PIPE_BUF:
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#ifdef PIPE_BUF
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return PIPE_BUF;
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#else
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return -1;
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#endif
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case _PC_CHOWN_RESTRICTED:
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#ifdef _POSIX_CHOWN_RESTRICTED
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return _POSIX_CHOWN_RESTRICTED;
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#else
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return -1;
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#endif
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case _PC_NO_TRUNC:
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#ifdef _POSIX_NO_TRUNC
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return _POSIX_NO_TRUNC;
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#else
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return -1;
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#endif
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case _PC_VDISABLE:
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#ifdef _POSIX_VDISABLE
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return _POSIX_VDISABLE;
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#else
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return -1;
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#endif
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case _PC_SYNC_IO:
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#ifdef _POSIX_SYNC_IO
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return _POSIX_SYNC_IO;
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#else
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return -1;
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#endif
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case _PC_ASYNC_IO:
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#ifdef _POSIX_ASYNC_IO
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{
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/* AIO is only allowed on regular files and block devices. */
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struct stat64 st;
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if (stat64 (path, &st) < 0
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|| (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode)))
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return -1;
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else
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return 1;
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}
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#else
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return -1;
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#endif
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case _PC_PRIO_IO:
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#ifdef _POSIX_PRIO_IO
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return _POSIX_PRIO_IO;
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#else
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return -1;
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#endif
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case _PC_SOCK_MAXBUF:
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#ifdef SOCK_MAXBUF
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return SOCK_MAXBUF;
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#else
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return -1;
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#endif
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case _PC_FILESIZEBITS:
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#ifdef FILESIZEBITS
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return FILESIZEBITS;
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#else
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/* We let platforms with larger file sizes overwrite this value. */
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return 32;
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#endif
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case _PC_REC_INCR_XFER_SIZE:
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/* XXX It is not entirely clear what the limit is supposed to do.
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What is incremented? */
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return -1;
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case _PC_REC_MAX_XFER_SIZE:
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/* XXX It is not entirely clear what the limit is supposed to do.
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In general there is no top limit of the number of bytes which
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case be transported at once. */
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return -1;
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case _PC_REC_MIN_XFER_SIZE:
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{
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/* XXX It is not entirely clear what the limit is supposed to do.
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I assume this is the block size of the filesystem. */
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struct statvfs64 sv;
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if (__statvfs64 (path, &sv) < 0)
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return -1;
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return sv.f_bsize;
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}
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case _PC_REC_XFER_ALIGN:
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{
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/* XXX It is not entirely clear what the limit is supposed to do.
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I assume that the number should reflect the minimal block
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alignment. */
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struct statvfs64 sv;
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if (__statvfs64 (path, &sv) < 0)
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return -1;
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return sv.f_frsize;
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}
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case _PC_ALLOC_SIZE_MIN:
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{
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/* XXX It is not entirely clear what the limit is supposed to do.
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I assume that the number should reflect the minimal block
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alignment. */
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struct statvfs64 sv;
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if (__statvfs64 (path, &sv) < 0)
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return -1;
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return sv.f_frsize;
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}
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case _PC_SYMLINK_MAX:
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/* In general there are no limits. If a system has one it should
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overwrite this case. */
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return -1;
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}
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}
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weak_alias (__pathconf, pathconf)
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