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