glibc/sysdeps/unix/sysv/linux/fstatvfs.c

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/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <mntent.h>
#include <paths.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
/* These definitions come from the kernel headers. But we cannot
Update. 1998-03-23 07:52 H.J. Lu <hjl@gnu.org> * elf/dl-close.c (_dl_close): Fix byte count while removing the shared object from the global scope list and optimize a little bit. 1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/filesys.texi (Scanning Directory Content): Add missing closing brace. (Scanning Directory Content): Fix text. 1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/memory.texi (Heap Consistency Checking): Add paragraph explaining difference of -lmcheck and MALLOC_CHECK_. 1998-03-23 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/unix/sysv/linux/fstatvfs.c (fstatvfs): Correct some typos in comments. 1998-03-20 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * test-skeleton.c (main): Fix test for exit signal. 1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/strtok_r.c: Undefine __strtok_r. 1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/memcmp.c [_LIBC]: Define WORDS_BIGENDIAN as appropriate. 1998-03-23 11:14 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * libc.map: Export __strtok_r. 1998-03-23 Ulrich Drepper <drepper@cygnus.com> * posix/regex.c (re_compile_fastmap): Remove unused variable num_regs and adjust comment. Patch by Jim Meyering <meyering@ascend.com>. * math/math.h (M_*l): Extend long double constants to be usable for 128 bit floats. Patch by Richard Henderson. 1998-03-23 11:16 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> Patch by Tim Waugh and Andreas Schwab.
1998-03-23 11:53:10 +00:00
include the headers here because of type clashes. If new
filesystem types will become available we have to add the
appropriate definitions here.*/
#define ADFS_SUPER_MAGIC 0xadf5
#define AFFS_SUPER_MAGIC 0xadff
#define CODA_SUPER_MAGIC 0x73757245
#define EXT2_SUPER_MAGIC 0xef53
#define HPFS_SUPER_MAGIC 0xf995e849
#define ISOFS_SUPER_MAGIC 0x9660
#define MINIX_SUPER_MAGIC 0x137f
#define MINIX_SUPER_MAGIC2 0x138F
#define MINIX2_SUPER_MAGIC 0x2468
#define MINIX2_SUPER_MAGIC2 0x2478
#define MSDOS_SUPER_MAGIC 0x4d44
#define NCP_SUPER_MAGIC 0x564c
#define NFS_SUPER_MAGIC 0x6969
#define PROC_SUPER_MAGIC 0x9fa0
#define SMB_SUPER_MAGIC 0x517b
#define XENIX_SUPER_MAGIC 0x012ff7b4
#define SYSV4_SUPER_MAGIC 0x012ff7b5
#define SYSV2_SUPER_MAGIC 0x012ff7b6
#define COH_SUPER_MAGIC 0x012ff7b7
int
fstatvfs (int fd, struct statvfs *buf)
{
struct statfs fsbuf;
struct stat st;
/* Get as much information as possible from the system. */
if (__fstatfs (fd, &fsbuf) < 0)
return -1;
Update. 1998-03-23 07:52 H.J. Lu <hjl@gnu.org> * elf/dl-close.c (_dl_close): Fix byte count while removing the shared object from the global scope list and optimize a little bit. 1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/filesys.texi (Scanning Directory Content): Add missing closing brace. (Scanning Directory Content): Fix text. 1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/memory.texi (Heap Consistency Checking): Add paragraph explaining difference of -lmcheck and MALLOC_CHECK_. 1998-03-23 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/unix/sysv/linux/fstatvfs.c (fstatvfs): Correct some typos in comments. 1998-03-20 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * test-skeleton.c (main): Fix test for exit signal. 1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/strtok_r.c: Undefine __strtok_r. 1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/memcmp.c [_LIBC]: Define WORDS_BIGENDIAN as appropriate. 1998-03-23 11:14 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * libc.map: Export __strtok_r. 1998-03-23 Ulrich Drepper <drepper@cygnus.com> * posix/regex.c (re_compile_fastmap): Remove unused variable num_regs and adjust comment. Patch by Jim Meyering <meyering@ascend.com>. * math/math.h (M_*l): Extend long double constants to be usable for 128 bit floats. Patch by Richard Henderson. 1998-03-23 11:16 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> Patch by Tim Waugh and Andreas Schwab.
1998-03-23 11:53:10 +00:00
/* Now fill in the fields we have information for. */
buf->f_bsize = fsbuf.f_bsize;
buf->f_blocks = fsbuf.f_blocks;
buf->f_bfree = fsbuf.f_bfree;
buf->f_bavail = fsbuf.f_bavail;
buf->f_files = fsbuf.f_files;
buf->f_ffree = fsbuf.f_ffree;
buf->f_fsid = fsbuf.f_fsid;
buf->f_namemax = fsbuf.f_namelen;
memset (buf->f_spare, '\0', 6 * sizeof (int));
/* What remains to do is to fill the fields f_frsize, f_favail,
and f_flag. */
switch (fsbuf.f_type)
{
case EXT2_SUPER_MAGIC:
/* This is not really correct since the fragment size can vary. */
buf->f_frsize = 1024;
break;
case ADFS_SUPER_MAGIC:
case AFFS_SUPER_MAGIC:
case CODA_SUPER_MAGIC:
case HPFS_SUPER_MAGIC:
case ISOFS_SUPER_MAGIC:
case MINIX_SUPER_MAGIC:
case MINIX_SUPER_MAGIC2:
case MINIX2_SUPER_MAGIC:
case MINIX2_SUPER_MAGIC2:
case MSDOS_SUPER_MAGIC:
case NCP_SUPER_MAGIC:
case NFS_SUPER_MAGIC:
case PROC_SUPER_MAGIC:
case SMB_SUPER_MAGIC:
case XENIX_SUPER_MAGIC:
case SYSV4_SUPER_MAGIC:
case SYSV2_SUPER_MAGIC:
case COH_SUPER_MAGIC:
default:
/* I hope it's safe to assume no fragmentation. */
buf->f_frsize = buf->f_bsize;
break;
}
/* XXX I have no idea how to compute f_favail. Any idea??? */
buf->f_favail = buf->f_ffree;
Update. 1998-03-23 07:52 H.J. Lu <hjl@gnu.org> * elf/dl-close.c (_dl_close): Fix byte count while removing the shared object from the global scope list and optimize a little bit. 1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/filesys.texi (Scanning Directory Content): Add missing closing brace. (Scanning Directory Content): Fix text. 1998-03-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/memory.texi (Heap Consistency Checking): Add paragraph explaining difference of -lmcheck and MALLOC_CHECK_. 1998-03-23 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/unix/sysv/linux/fstatvfs.c (fstatvfs): Correct some typos in comments. 1998-03-20 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * test-skeleton.c (main): Fix test for exit signal. 1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/strtok_r.c: Undefine __strtok_r. 1998-03-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/memcmp.c [_LIBC]: Define WORDS_BIGENDIAN as appropriate. 1998-03-23 11:14 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * libc.map: Export __strtok_r. 1998-03-23 Ulrich Drepper <drepper@cygnus.com> * posix/regex.c (re_compile_fastmap): Remove unused variable num_regs and adjust comment. Patch by Jim Meyering <meyering@ascend.com>. * math/math.h (M_*l): Extend long double constants to be usable for 128 bit floats. Patch by Richard Henderson. 1998-03-23 11:16 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> Patch by Tim Waugh and Andreas Schwab.
1998-03-23 11:53:10 +00:00
/* Determining the flags is tricky. We have to read /proc/mounts or
the /etc/mtab file and search for the entry which matches the given
file. The way we can test for matching filesystem is using the
device number. */
buf->f_flag = 0;
if (fstat (fd, &st) >= 0)
{
int save_errno = errno;
struct mntent mntbuf;
FILE *mtab;
mtab = __setmntent ("/proc/mounts", "r");
if (mtab == NULL)
mtab = __setmntent (_PATH_MOUNTED, "r");
if (mtab != NULL)
{
char tmpbuf[1024];
while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
{
struct stat fsst;
/* Find out about the device the current entry is for. */
if (stat (mntbuf.mnt_dir, &fsst) >= 0
&& st.st_dev == fsst.st_dev)
{
/* Bingo, we found the entry for the device FD is on.
Now interpret the option string. */
char *cp = mntbuf.mnt_opts;
char *opt;
while ((opt = strsep (&cp, ",")) != NULL)
if (strcmp (opt, "ro") == 0)
buf->f_flag |= ST_RDONLY;
else if (strcmp (opt, "nosuid") == 0)
buf->f_flag |= ST_NOSUID;
else if (strcmp (opt, "noexec") == 0)
buf->f_flag |= ST_NOEXEC;
else if (strcmp (opt, "nodev") == 0)
buf->f_flag |= ST_NODEV;
else if (strcmp (opt, "sync") == 0)
buf->f_flag |= ST_SYNCHRONOUS;
else if (strcmp (opt, "mand") == 0)
buf->f_flag |= ST_MANDLOCK;
else if (strcmp (opt, "noatime") == 0)
buf->f_flag |= ST_NOATIME;
/* We can stop looking for more entries. */
break;
}
}
/* Close the file. */
__endmntent (mtab);
}
__set_errno (save_errno);
}
/* We signal success if the statfs call succeeded. */
return 0;
}