-/* fsusage.c -- return space usage of mounted filesystems
- Copyright (C) 1991, 1992, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
+/* fsusage.c -- return space usage of mounted file systems
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2009-2010 Free Software
+ Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-#if HAVE_INTTYPES_H
-# include <inttypes.h>
-#endif
-#include <sys/types.h>
-#include <sys/stat.h>
#include "fsusage.h"
-#if HAVE_LIMITS_H
-# include <limits.h>
-#endif
-#ifndef CHAR_BIT
-# define CHAR_BIT 8
-#endif
-
-int statfs ();
-
-#if HAVE_SYS_PARAM_H
-# include <sys/param.h>
-#endif
-
-#if HAVE_SYS_MOUNT_H
-# include <sys/mount.h>
-#endif
-
-#if HAVE_SYS_VFS_H
-# include <sys/vfs.h>
-#endif
-
-#if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
-# include <sys/fs/s5param.h>
-#endif
-
-#if defined (HAVE_SYS_FILSYS_H) && !defined (_CRAY)
-# include <sys/filsys.h> /* SVR2 */
-#endif
+#include <limits.h>
+#include <sys/types.h>
-#if HAVE_FCNTL_H
+#if STAT_STATVFS /* POSIX 1003.1-2001 (and later) with XSI */
+# include <sys/statvfs.h>
+#else
+/* Don't include backward-compatibility files unless they're needed.
+ Eventually we'd like to remove all this cruft. */
# include <fcntl.h>
+# include <unistd.h>
+# include <sys/stat.h>
+# if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+# endif
+# if HAVE_SYS_MOUNT_H
+# include <sys/mount.h>
+# endif
+# if HAVE_SYS_VFS_H
+# include <sys/vfs.h>
+# endif
+# if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
+# include <sys/fs/s5param.h>
+# endif
+# if defined HAVE_SYS_FILSYS_H && !defined _CRAY
+# include <sys/filsys.h> /* SVR2 */
+# endif
+# if HAVE_SYS_STATFS_H
+# include <sys/statfs.h>
+# endif
+# if HAVE_DUSTAT_H /* AIX PS/2 */
+# include <sys/dustat.h>
+# endif
+# include "full-read.h"
#endif
-#if HAVE_SYS_STATFS_H
-# include <sys/statfs.h>
-#endif
-
-#if HAVE_DUSTAT_H /* AIX PS/2 */
-# include <sys/dustat.h>
-#endif
-
-#if HAVE_SYS_STATVFS_H /* SVR4 */
-# include <sys/statvfs.h>
-int statvfs ();
-#endif
+/* The results of open() in this file are not used with fchdir,
+ therefore save some unnecessary work in fchdir.c. */
+#undef open
+#undef close
/* Many space usage primitives use all 1 bits to denote a value that is
not applicable or unknown. Propagate this information by returning
- a uintmax_t value that is all 1 bits if the argument is all 1 bits,
- even if the argument is unsigned and smaller than uintmax_t. */
-#define PROPAGATE_ALL_ONES(x) ((x) == -1 ? (uintmax_t) -1 : (uintmax_t) (x))
+ a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
+ is unsigned and narrower than uintmax_t. */
+#define PROPAGATE_ALL_ONES(x) \
+ ((sizeof (x) < sizeof (uintmax_t) \
+ && (~ (x) == (sizeof (x) < sizeof (int) \
+ ? - (1 << (sizeof (x) * CHAR_BIT)) \
+ : 0))) \
+ ? UINTMAX_MAX : (uintmax_t) (x))
/* Extract the top bit of X as an uintmax_t value. */
#define EXTRACT_TOP_BIT(x) ((x) \
- & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
+ & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
/* If a value is negative, many space usage primitives store it into an
integer variable by assignment, even if the variable's type is unsigned.
otherwise, use PROPAGATE_ALL_ONES. */
#define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
-int safe_read ();
-
/* Fill in the fields of FSP with information about space usage for
- the filesystem on which PATH resides.
- DISK is the device on which PATH is mounted, for space-getting
+ the file system on which FILE resides.
+ DISK is the device on which FILE is mounted, for space-getting
methods that need to know it.
Return 0 if successful, -1 if not. When returning -1, ensure that
ERRNO is either a system error value, or zero if DISK is NULL
on a system that requires a non-NULL value. */
int
-get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
+get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
{
-#ifdef STAT_STATFS3_OSF1
+#if defined STAT_STATVFS /* POSIX, except glibc/Linux */
- struct statfs fsd;
+ struct statvfs fsd;
- if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
+ if (statvfs (file, &fsd) < 0)
return -1;
- fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
-
-#endif /* STAT_STATFS3_OSF1 */
+ /* f_frsize isn't guaranteed to be supported. */
+ fsp->fsu_blocksize = (fsd.f_frsize
+ ? PROPAGATE_ALL_ONES (fsd.f_frsize)
+ : PROPAGATE_ALL_ONES (fsd.f_bsize));
-#ifdef STAT_STATFS2_FS_DATA /* Ultrix */
+#elif defined STAT_STATFS2_FS_DATA /* Ultrix */
struct fs_data fsd;
- if (statfs (path, &fsd) != 1)
+ if (statfs (file, &fsd) != 1)
return -1;
fsp->fsu_blocksize = 1024;
fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
-#endif /* STAT_STATFS2_FS_DATA */
-
-#ifdef STAT_READ_FILSYS /* SVR2 */
+#elif defined STAT_READ_FILSYS /* SVR2 */
# ifndef SUPERBOFF
# define SUPERBOFF (SUPERB * 512)
# endif
if (fd < 0)
return -1;
lseek (fd, (off_t) SUPERBOFF, 0);
- if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
+ if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
{
close (fd);
return -1;
fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
fsp->fsu_files = (fsd.s_isize == -1
- ? (uintmax_t) -1
- : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
+ ? UINTMAX_MAX
+ : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
-#endif /* STAT_READ_FILSYS */
+#elif defined STAT_STATFS3_OSF1 /* OSF/1 */
+
+ struct statfs fsd;
+
+ if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
+ return -1;
+
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
-#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
+#elif defined STAT_STATFS2_BSIZE /* glibc/Linux, 4.3BSD, SunOS 4, \
+ MacOS X < 10.4, FreeBSD < 5.0, \
+ NetBSD < 3.0, OpenBSD < 4.4 */
struct statfs fsd;
- if (statfs (path, &fsd) < 0)
+ if (statfs (file, &fsd) < 0)
return -1;
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
}
# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
-#endif /* STAT_STATFS2_BSIZE */
-
-#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
+#elif defined STAT_STATFS2_FSIZE /* 4.4BSD and older NetBSD */
struct statfs fsd;
- if (statfs (path, &fsd) < 0)
+ if (statfs (file, &fsd) < 0)
return -1;
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
-#endif /* STAT_STATFS2_FSIZE */
-
-#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
+#elif defined STAT_STATFS4 /* SVR3, Dynix, old Irix, old AIX, \
+ Dolphin */
# if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
# define f_bavail f_bfree
struct statfs fsd;
- if (statfs (path, &fsd, sizeof fsd, 0) < 0)
+ if (statfs (file, &fsd, sizeof fsd, 0) < 0)
return -1;
/* Empirically, the block counts on most SVR3 and SVR3-derived
systems seem to always be in terms of 512-byte blocks,
no matter what value f_bsize has. */
-# if _AIX || defined(_CRAY)
+# if _AIX || defined _CRAY
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
# else
fsp->fsu_blocksize = 512;
# endif
-#endif /* STAT_STATFS4 */
-
-#ifdef STAT_STATVFS /* SVR4 */
-
- struct statvfs fsd;
-
- if (statvfs (path, &fsd) < 0)
- return -1;
-
- /* f_frsize isn't guaranteed to be supported. */
- fsp->fsu_blocksize =
- PROPAGATE_ALL_ONES (fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize);
-
-#endif /* STAT_STATVFS */
+#endif
-#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)
- /* !Ultrix && !SVR2 */
+#if (defined STAT_STATVFS \
+ || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS))
fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
-#endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
+#endif
+ (void) disk; /* avoid argument-unused warning */
return 0;
}
-#if defined(_AIX) && defined(_I386)
+#if defined _AIX && defined _I386
/* AIX PS/2 does not supply statfs. */
int
-statfs (char *path, struct statfs *fsb)
+statfs (char *file, struct statfs *fsb)
{
struct stat stats;
struct dustat fsd;
- if (stat (path, &stats))
+ if (stat (file, &stats) != 0)
return -1;
if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
return -1;