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glibc/sysdeps/unix/sysv/linux/internal_statvfs.c
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/* Copyright (C) 1998, 1999, 2000 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. */ | |
/* Now fill in the fields we have information for. */ | |
buf->f_bsize = fsbuf.f_bsize; | |
/* Linux does not support f_frsize, so set it to the full block size. */ | |
buf->f_frsize = 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_favail and f_flag. */ | |
/* XXX I have no idea how to compute f_favail. Any idea??? */ | |
buf->f_favail = buf->f_ffree; | |
/* 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 (STAT (&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; | |
else if (strcmp (opt, "nodiratime") == 0) | |
buf->f_flag |= ST_NODIRATIME; | |
/* We can stop looking for more entries. */ | |
break; | |
} | |
} | |
/* Close the file. */ | |
__endmntent (mtab); | |
} | |
__set_errno (save_errno); | |
} |