Commit pandora source code
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241
src/fsusage.cpp
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241
src/fsusage.cpp
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/* fsusage.c -- return space usage of mounted filesystems
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Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "sysconfig.h"
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#include "sysdeps.h"
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#include "config.h"
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/statfs.h>
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#include <SDL.h>
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#include "fsusage.h"
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/* Return the number of TOSIZE-byte blocks used by
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BLOCKS FROMSIZE-byte blocks, rounding away from zero.
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TOSIZE must be positive. Return -1 if FROMSIZE is not positive. */
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static long adjust_blocks(long blocks, int fromsize, int tosize)
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{
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if (tosize <= 0)
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abort ();
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if (fromsize <= 0)
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return -1;
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if (fromsize == tosize) /* e.g., from 512 to 512 */
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return blocks;
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else if (fromsize > tosize) /* e.g., from 2048 to 512 */
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return blocks * (fromsize / tosize);
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else /* e.g., from 256 to 512 */
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return (blocks + (blocks < 0 ? -1 : 1)) / (tosize / fromsize);
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}
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/* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted.
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Return the actual number of bytes read, zero for EOF, or negative
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for an error. */
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int
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safe_read
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(int desc,
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char *ptr,
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int len)
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{
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int n_chars;
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if (len <= 0)
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return len;
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#ifdef EINTR
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do
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{
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n_chars = read (desc, ptr, len);
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}
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while (n_chars < 0 && errno == EINTR);
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#else
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n_chars = read (desc, ptr, len);
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#endif
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return n_chars;
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}
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/* Fill in the fields of FSP with information about space usage for
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the filesystem on which PATH resides.
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DISK is the device on which PATH is mounted, for space-getting
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methods that need to know it.
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Return 0 if successful, -1 if not. When returning -1, ensure that
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ERRNO is either a system error value, or zero if DISK is NULL
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on a system that requires a non-NULL value. */
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int
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get_fs_usage
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(const char *path,
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const char *disk,
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struct fs_usage *fsp)
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{
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/* TODO: *** use RFs:Volume() to get free space *** */
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/* Just a hack */
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fsp->fsu_blocks = 507289;
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fsp->fsu_bfree = 3435973;
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fsp->fsu_bavail = 507289 / 2;
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fsp->fsu_files = 3435973;
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fsp->fsu_ffree = 3435973;
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#ifdef STAT_STATFS3_OSF1
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# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_fsize, 512)
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struct statfs fsd;
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if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
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return -1;
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#endif /* STAT_STATFS3_OSF1 */
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#ifdef STAT_STATFS2_FS_DATA /* Ultrix */
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# define CONVERT_BLOCKS(B) adjust_blocks ((B), 1024, 512)
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struct fs_data fsd;
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if (statfs (path, &fsd) != 1)
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return -1;
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fsp->fsu_blocks = CONVERT_BLOCKS (fsd.fd_req.btot);
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fsp->fsu_bfree = CONVERT_BLOCKS (fsd.fd_req.bfree);
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fsp->fsu_bavail = CONVERT_BLOCKS (fsd.fd_req.bfreen);
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fsp->fsu_files = fsd.fd_req.gtot;
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fsp->fsu_ffree = fsd.fd_req.gfree;
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#endif /* STAT_STATFS2_FS_DATA */
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#ifdef STAT_READ_FILSYS /* SVR2 */
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# ifndef SUPERBOFF
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# define SUPERBOFF (SUPERB * 512)
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# endif
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# define CONVERT_BLOCKS(B) \
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adjust_blocks ((B), (fsd.s_type == Fs2b ? 1024 : 512), 512)
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struct filsys fsd;
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int fd;
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if (! disk)
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{
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errno = 0;
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return -1;
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}
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fd = open (disk, O_RDONLY);
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if (fd < 0)
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return -1;
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lseek (fd, (long) SUPERBOFF, 0);
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if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
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{
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close (fd);
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return -1;
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}
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close (fd);
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fsp->fsu_blocks = CONVERT_BLOCKS (fsd.s_fsize);
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fsp->fsu_bfree = CONVERT_BLOCKS (fsd.s_tfree);
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fsp->fsu_bavail = CONVERT_BLOCKS (fsd.s_tfree);
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fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1);
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fsp->fsu_ffree = fsd.s_tinode;
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#endif /* STAT_READ_FILSYS */
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#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
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# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_bsize, 512)
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struct statfs fsd;
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if (statfs (path, &fsd) < 0)
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return -1;
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# ifdef STATFS_TRUNCATES_BLOCK_COUNTS
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/* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
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struct statfs are truncated to 2GB. These conditions detect that
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truncation, presumably without botching the 4.1.1 case, in which
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the values are not truncated. The correct counts are stored in
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undocumented spare fields. */
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if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0)
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{
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fsd.f_blocks = fsd.f_spare[0];
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fsd.f_bfree = fsd.f_spare[1];
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fsd.f_bavail = fsd.f_spare[2];
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}
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# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
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#endif /* STAT_STATFS2_BSIZE */
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#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
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# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_fsize, 512)
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struct statfs fsd;
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if (statfs (path, &fsd) < 0)
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return -1;
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#endif /* STAT_STATFS2_FSIZE */
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#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
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# if _AIX || defined(_CRAY)
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# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_bsize, 512)
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# ifdef _CRAY
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# define f_bavail f_bfree
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# endif
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# else
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# define CONVERT_BLOCKS(B) (B)
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# ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx */
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# ifndef DOLPHIN /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
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# define f_bavail f_bfree
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# endif
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# endif
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# endif
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struct statfs fsd;
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if (statfs (path, &fsd, sizeof fsd, 0) < 0)
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return -1;
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/* Empirically, the block counts on most SVR3 and SVR3-derived
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systems seem to always be in terms of 512-byte blocks,
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no matter what value f_bsize has. */
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#endif /* STAT_STATFS4 */
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#ifdef STAT_STATVFS /* SVR4 */
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# define CONVERT_BLOCKS(B) \
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adjust_blocks ((B), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
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struct statvfs fsd;
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if (statvfs (path, &fsd) < 0)
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return -1;
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/* f_frsize isn't guaranteed to be supported. */
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#endif /* STAT_STATVFS */
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#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)
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/* !Ultrix && !SVR2 */
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fsp->fsu_blocks = CONVERT_BLOCKS (fsd.f_blocks);
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fsp->fsu_bfree = CONVERT_BLOCKS (fsd.f_bfree);
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fsp->fsu_bavail = CONVERT_BLOCKS (fsd.f_bavail);
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fsp->fsu_files = fsd.f_files;
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fsp->fsu_ffree = fsd.f_ffree;
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#endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
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return 0;
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}
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