06f1f03e7a
On Solaris, using f_bsize provided a value that is apparently much larger than the real block size. The solaris docs for statvfs say f_bsize is the "preferred" file system block size, and I guess the filesystem prefers larger blocks, but uses smaller ones or something. The docs also say that f_frsize is the "fundamental" block size. Switched to using f_frsize on Linux and kFreeBSD too, since I guess f_bsize could in theory vary the same way there too. Assuming that Solaris is not violating the posix spec, I guess the linux man page for statvfs is not as well written and I misunderstood it.
93 lines
2 KiB
C
93 lines
2 KiB
C
/* disk free space checking, C mini-library
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*
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* Copyright 2012, 2014 Joey Hess <id@joeyh.name>
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*
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* License: BSD-2-clause
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*/
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/* Include appropriate headers for the OS, and define what will be used to
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* check the free space. */
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#if defined(__APPLE__)
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# define _DARWIN_FEATURE_64_BIT_INODE 1
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# include <sys/param.h>
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# include <sys/mount.h>
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# define STATCALL statfs
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# define STATSTRUCT statfs64
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# define BSIZE f_bsize
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#else
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#if defined (__FreeBSD__)
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# include <sys/param.h>
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# include <sys/mount.h>
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# define STATCALL statfs /* statfs64 not yet tested on a real FreeBSD machine */
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# define STATSTRUCT statfs
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# define BSIZE f_bsize
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#else
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#if defined __ANDROID__
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# warning free space checking code not available for Android
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# define UNKNOWN
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#else
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#if defined (__linux__) || defined (__FreeBSD_kernel__) || (defined (__SVR4) && defined (__sun))
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/* Linux or Debian kFreeBSD or Solaris */
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/* This is a POSIX standard, so might also work elsewhere too. */
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# include <sys/statvfs.h>
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# define STATCALL statvfs
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# define STATSTRUCT statvfs
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# define BSIZE f_frsize
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#else
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# warning free space checking code not available for this OS
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# define UNKNOWN
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#endif
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#endif
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#endif
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#endif
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#include <errno.h>
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#include <stdio.h>
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unsigned long long int get(const char *path, int req) {
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#ifdef UNKNOWN
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errno = 1;
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return 0;
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#else
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unsigned long long int v, blocksize;
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struct STATSTRUCT buf;
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if (STATCALL(path, &buf) != 0)
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return 0; /* errno is set */
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else
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errno = 0;
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switch (req) {
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case 0:
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v = buf.f_blocks;
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break;
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case 1:
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v = buf.f_bavail;
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break;
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default:
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v = 0;
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}
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blocksize = buf.BSIZE;
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return v * blocksize;
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#endif
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}
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/* Checks the amount of disk that is available to regular (non-root) users.
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* (If there's an error, or this is not supported,
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* returns 0 and sets errno to nonzero.)
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*/
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unsigned long long int diskfree(const char *path) {
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return get(path, 1);
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}
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/* Gets the total size of the disk. */
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unsigned long long int disksize(const char *path) {
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return get(path, 0);
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}
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/*
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main () {
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printf("%lli\n", diskfree("."));
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}
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*/
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