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/*++
/* NAME
/* fsspace 3
/* SUMMARY
/* determine available file system space
/* SYNOPSIS
/* #include <fsspace.h>
/*
/* struct fsspace {
/* .in +4
/* unsigned long block_size;
/* unsigned long block_free;
/* .in -4
/* };
/*
/* void fsspace(path, sp)
/* const char *path;
/* struct fsspace *sp;
/* DESCRIPTION
/* fsspace() returns the amount of available space in the file
/* system specified in \fIpath\fR, in terms of the block size and
/* of the number of available blocks.
/* DIAGNOSTICS
/* All errors are fatal.
/* BUGS
/* Use caution when doing computations with the result from fsspace().
/* It is easy to cause overflow (by multiplying large numbers) or to
/* cause underflow (by subtracting unsigned numbers).
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#if defined(STATFS_IN_SYS_MOUNT_H)
#include <sys/param.h>
#include <sys/mount.h>
#elif defined(STATFS_IN_SYS_VFS_H)
#include <sys/vfs.h>
#elif defined(STATVFS_IN_SYS_STATVFS_H)
#include <sys/statvfs.h>
#elif defined(STATFS_IN_SYS_STATFS_H)
#include <sys/statfs.h>
#else
#ifdef USE_STATFS
#error "please specify the include file with `struct statfs'"
#else
#error "please specify the include file with `struct statvfs'"
#endif
#endif
/* Utility library. */
#include <msg.h>
#include <fsspace.h>
/* fsspace - find amount of available file system space */
void fsspace(const char *path, struct fsspace * sp)
{
const char *myname = "fsspace";
#ifdef USE_STATFS
#ifdef USE_STRUCT_FS_DATA /* Ultrix */
struct fs_data fsbuf;
if (statfs(path, &fsbuf) < 0)
msg_fatal("statfs %s: %m", path);
sp->block_size = 1024;
sp->block_free = fsbuf.fd_bfreen;
#else
struct statfs fsbuf;
if (statfs(path, &fsbuf) < 0)
msg_fatal("statfs %s: %m", path);
sp->block_size = fsbuf.f_bsize;
sp->block_free = fsbuf.f_bavail;
#endif
#endif
#ifdef USE_STATVFS
struct statvfs fsbuf;
if (statvfs(path, &fsbuf) < 0)
msg_fatal("statvfs %s: %m", path);
sp->block_size = fsbuf.f_frsize;
sp->block_free = fsbuf.f_bavail;
#endif
if (msg_verbose)
msg_info("%s: %s: block size %lu, blocks free %lu",
myname, path, sp->block_size, sp->block_free);
}
#ifdef TEST
/*
* Proof-of-concept test program: print free space unit and count for all
* listed file systems.
*/
#include <vstream.h>
int main(int argc, char **argv)
{
struct fsspace sp;
if (argc == 1)
msg_fatal("usage: %s filesystem...", argv[0]);
while (--argc && *++argv) {
fsspace(*argv, &sp);
vstream_printf("%10s: block size %lu, blocks free %lu\n",
*argv, sp.block_size, sp.block_free);
vstream_fflush(VSTREAM_OUT);
}
return (0);
}
#endif
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