75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* disk free space checking, C mini-library
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*
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* Copyright 2012 Joey Hess <joey@kitenet.net>
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*
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* Licensed under the GNU GPL version 3 or higher.
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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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# include <sys/param.h>
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# include <sys/mount.h>
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/* In newer OSX versions, statfs64 is deprecated, in favor of statfs,
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* which is 64 bit only with a build option -- but statfs64 still works,
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* and this keeps older OSX also supported. */
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# define STATCALL statfs64
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# define STATSTRUCT statfs64
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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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#else
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#if defined (__FreeBSD_kernel__) /* Debian kFreeBSD */
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# include <sys/param.h>
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# include <sys/mount.h>
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# define STATCALL statfs64
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# define STATSTRUCT statfs
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# warning free space checking code temporarily disabled due to build failure
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# define UNKNOWN
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#else
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#if defined (__linux__)
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/* This is a POSIX standard, so might also work elsewhere. */
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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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#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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/* 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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#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 available, blocksize;
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struct STATSTRUCT buf;
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errno = 0;
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if (STATCALL(path, &buf) != 0)
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return 0; /* errno is set */
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available = buf.f_bavail;
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blocksize = buf.f_bsize;
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return available * blocksize;
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#endif
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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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