X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffsusage.c;h=0dff85c0abfcd91bc1e5a4184bf12135debc8c02;hb=2957c7e48ca78d82df43b32427c66671c8c0e1d2;hp=d0d746556e1de0fd7eb939f82e8871f681970c68;hpb=456b8699f1e48ea68e9e409d29288a94ef426a30;p=gnulib.git diff --git a/lib/fsusage.c b/lib/fsusage.c index d0d746556..0dff85c0a 100644 --- a/lib/fsusage.c +++ b/lib/fsusage.c @@ -1,5 +1,5 @@ /* fsusage.c -- return space usage of mounted filesystems - Copyright (C) 1991, 1992 Free Software Foundation, Inc. + Copyright (C) 1991, 1992, 1996, 1998, 1999, 2000 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 @@ -12,190 +12,245 @@ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ - -#ifdef HAVE_CONFIG_H -#if defined (CONFIG_BROKETS) -/* We use instead of "config.h" so that a compilation - using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h - (which it would do because it found this file in $srcdir). */ -#include -#else -#include "config.h" -#endif + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#if HAVE_CONFIG_H +# include #endif +#if HAVE_INTTYPES_H +# include +#endif #include +#include #include "fsusage.h" +#if HAVE_LIMITS_H +# include +#endif +#ifndef CHAR_BIT +# define CHAR_BIT 8 +#endif + int statfs (); -#if defined (STAT_STATFS3_OSF1) /* DEC Alpha running OSF/1 */ -# include +#if HAVE_SYS_PARAM_H +# include #endif -#if defined(STAT_STATFS2_BSIZE) && !defined(_IBMR2) /* 4.3BSD, SunOS 4, HP-UX, AIX PS/2. */ -#include +#if HAVE_SYS_MOUNT_H +# include #endif -#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */ -#include +#if HAVE_SYS_VFS_H +# include #endif -#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */ -#include -#include +#if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */ +# include #endif -#ifdef STAT_READ /* SVR2. */ -#include -#include -#include +#if defined (HAVE_SYS_FILSYS_H) && !defined (_CRAY) +# include /* SVR2 */ #endif -#if defined(STAT_STATFS4) || (defined(_AIX) && defined(_IBMR2)) /* SVR3, Dynix, Irix, AIX RS6000. */ -#include +#if HAVE_FCNTL_H +# include #endif -#if defined(_AIX) && defined(_I386) /* AIX PS/2. */ -#include -#include +#if HAVE_SYS_STATFS_H +# include #endif -#ifdef STAT_STATVFS /* SVR4. */ -#include +#if HAVE_DUSTAT_H /* AIX PS/2 */ +# include +#endif + +#if HAVE_SYS_STATVFS_H /* SVR4 */ +# include int statvfs (); #endif -/* Return the number of TOSIZE-byte blocks used by - BLOCKS FROMSIZE-byte blocks, rounding away from zero. - TOSIZE must be positive. Return -1 if FROMSIZE is not positive. */ +/* 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)) -static long -adjust_blocks (blocks, fromsize, tosize) - long blocks; - int fromsize, tosize; -{ - if (tosize <= 0) - abort (); - if (fromsize <= 0) - return -1; - - if (fromsize == tosize) /* E.g., from 512 to 512. */ - return blocks; - else if (fromsize > tosize) /* E.g., from 2048 to 512. */ - return blocks * (fromsize / tosize); - else /* E.g., from 256 to 512. */ - return (blocks + (blocks < 0 ? -1 : 1)) / (tosize / fromsize); -} +/* 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))) + +/* 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. + So, if a space usage variable X's top bit is set, convert X to the + uintmax_t value V such that (- (uintmax_t) V) is the negative of + the original value. If X's top bit is clear, just yield X. + Use PROPAGATE_TOP_BIT if the original value might be negative; + 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 methods that need to know it. - Return 0 if successful, -1 if not. */ - + 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 (path, disk, fsp) - char *path, *disk; - struct fs_usage *fsp; +get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp) { -#if defined (STAT_STATFS3_OSF1) +#ifdef STAT_STATFS3_OSF1 + struct statfs fsd; if (statfs (path, &fsd, sizeof (struct statfs)) != 0) return -1; -#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512) + + fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize); + #endif /* STAT_STATFS3_OSF1 */ -#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */ +#ifdef STAT_STATFS2_FS_DATA /* Ultrix */ + struct fs_data fsd; if (statfs (path, &fsd) != 1) return -1; -#define CONVERT_BLOCKS(b) adjust_blocks ((b), 1024, 512) - fsp->fsu_blocks = CONVERT_BLOCKS (fsd.fd_req.btot); - fsp->fsu_bfree = CONVERT_BLOCKS (fsd.fd_req.bfree); - fsp->fsu_bavail = CONVERT_BLOCKS (fsd.fd_req.bfreen); - fsp->fsu_files = fsd.fd_req.gtot; - fsp->fsu_ffree = fsd.fd_req.gfree; -#endif -#ifdef STAT_READ /* SVR2. */ -#ifndef SUPERBOFF -#define SUPERBOFF (SUPERB * 512) -#endif + fsp->fsu_blocksize = 1024; + fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot); + fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree); + fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen); + fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0; + 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 */ +# ifndef SUPERBOFF +# define SUPERBOFF (SUPERB * 512) +# endif + struct filsys fsd; int fd; + if (! disk) + { + errno = 0; + return -1; + } + fd = open (disk, O_RDONLY); if (fd < 0) return -1; - lseek (fd, (long) SUPERBOFF, 0); - if (read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd) + lseek (fd, (off_t) SUPERBOFF, 0); + if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd) { close (fd); return -1; } close (fd); -#define CONVERT_BLOCKS(b) adjust_blocks ((b), (fsd.s_type == Fs2b ? 1024 : 512), 512) - fsp->fsu_blocks = CONVERT_BLOCKS (fsd.s_fsize); - fsp->fsu_bfree = CONVERT_BLOCKS (fsd.s_tfree); - fsp->fsu_bavail = CONVERT_BLOCKS (fsd.s_tfree); - fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1); - fsp->fsu_ffree = fsd.s_tinode; -#endif -#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX. */ + fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512); + fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize); + fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree); + 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)); + fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode); + +#endif /* STAT_READ_FILSYS */ + +#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */ + struct statfs fsd; if (statfs (path, &fsd) < 0) return -1; -#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512) -#endif -#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */ + fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize); + +# ifdef STATFS_TRUNCATES_BLOCK_COUNTS + + /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the + struct statfs are truncated to 2GB. These conditions detect that + truncation, presumably without botching the 4.1.1 case, in which + the values are not truncated. The correct counts are stored in + undocumented spare fields. */ + if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0) + { + fsd.f_blocks = fsd.f_spare[0]; + fsd.f_bfree = fsd.f_spare[1]; + fsd.f_bavail = fsd.f_spare[2]; + } +# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */ + +#endif /* STAT_STATFS2_BSIZE */ + +#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */ + struct statfs fsd; if (statfs (path, &fsd) < 0) return -1; -#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512) -#endif -#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix. */ + fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize); + +#endif /* STAT_STATFS2_FSIZE */ + +#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */ + +# if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN +# define f_bavail f_bfree +# endif + struct statfs fsd; if (statfs (path, &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. */ -#define CONVERT_BLOCKS(b) (b) -#ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx. */ -#ifndef DOLPHIN /* DOLPHIN 3.8.alfa/7.18 has f_bavail */ -#define f_bavail f_bfree -#endif -#endif -#endif +# 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 */ -#ifdef STAT_STATVFS /* SVR4. */ struct statvfs fsd; if (statvfs (path, &fsd) < 0) return -1; + /* f_frsize isn't guaranteed to be supported. */ -#define CONVERT_BLOCKS(b) \ - adjust_blocks ((b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512) -#endif + fsp->fsu_blocksize = + PROPAGATE_ALL_ONES (fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize); -#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ) /* !Ultrix && !SVR2. */ - fsp->fsu_blocks = CONVERT_BLOCKS (fsd.f_blocks); - fsp->fsu_bfree = CONVERT_BLOCKS (fsd.f_bfree); - fsp->fsu_bavail = CONVERT_BLOCKS (fsd.f_bavail); - fsp->fsu_files = fsd.f_files; - fsp->fsu_ffree = fsd.f_ffree; -#endif +#endif /* STAT_STATVFS */ + +#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS) + /* !Ultrix && !SVR2 */ + + fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks); + fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree); + fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail); + fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0; + 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 */ return 0; } @@ -204,9 +259,7 @@ get_fs_usage (path, disk, fsp) /* AIX PS/2 does not supply statfs. */ int -statfs (path, fsb) - char *path; - struct statfs *fsb; +statfs (char *path, struct statfs *fsb) { struct stat stats; struct dustat fsd; @@ -226,4 +279,5 @@ statfs (path, fsb) fsb->f_fsid.val[1] = fsd.du_pckno; return 0; } + #endif /* _AIX && _I386 */