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      1 /*	$NetBSD: fsspace.c,v 1.1.1.1 2009/06/23 10:08:59 tron Exp $	*/
      2 
      3 /*++
      4 /* NAME
      5 /*	fsspace 3
      6 /* SUMMARY
      7 /*	determine available file system space
      8 /* SYNOPSIS
      9 /*	#include <fsspace.h>
     10 /*
     11 /*	struct fsspace {
     12 /* .in +4
     13 /*		unsigned long block_size;
     14 /*		unsigned long block_free;
     15 /* .in -4
     16 /*	};
     17 /*
     18 /*	void	fsspace(path, sp)
     19 /*	const char *path;
     20 /*	struct fsspace *sp;
     21 /* DESCRIPTION
     22 /*	fsspace() returns the amount of available space in the file
     23 /*	system specified in \fIpath\fR, in terms of the block size and
     24 /*	of the number of available blocks.
     25 /* DIAGNOSTICS
     26 /*	All errors are fatal.
     27 /* BUGS
     28 /*	Use caution when doing computations with the result from fsspace().
     29 /*	It is easy to cause overflow (by multiplying large numbers) or to
     30 /*	cause underflow (by subtracting unsigned numbers).
     31 /* LICENSE
     32 /* .ad
     33 /* .fi
     34 /*	The Secure Mailer license must be distributed with this software.
     35 /* AUTHOR(S)
     36 /*	Wietse Venema
     37 /*	IBM T.J. Watson Research
     38 /*	P.O. Box 704
     39 /*	Yorktown Heights, NY 10598, USA
     40 /*--*/
     41 
     42 /* System library. */
     43 
     44 #include <sys_defs.h>
     45 
     46 #if defined(STATFS_IN_SYS_MOUNT_H)
     47 #include <sys/param.h>
     48 #include <sys/mount.h>
     49 #elif defined(STATFS_IN_SYS_VFS_H)
     50 #include <sys/vfs.h>
     51 #elif defined(STATVFS_IN_SYS_STATVFS_H)
     52 #include <sys/statvfs.h>
     53 #elif defined(STATFS_IN_SYS_STATFS_H)
     54 #include <sys/statfs.h>
     55 #else
     56 #ifdef USE_STATFS
     57 #error "please specify the include file with `struct statfs'"
     58 #else
     59 #error "please specify the include file with `struct statvfs'"
     60 #endif
     61 #endif
     62 
     63 /* Utility library. */
     64 
     65 #include <msg.h>
     66 #include <fsspace.h>
     67 
     68 /* fsspace - find amount of available file system space */
     69 
     70 void    fsspace(const char *path, struct fsspace * sp)
     71 {
     72     const char *myname = "fsspace";
     73 
     74 #ifdef USE_STATFS
     75 #ifdef USE_STRUCT_FS_DATA			/* Ultrix */
     76     struct fs_data fsbuf;
     77 
     78     if (statfs(path, &fsbuf) < 0)
     79 	msg_fatal("statfs %s: %m", path);
     80     sp->block_size = 1024;
     81     sp->block_free = fsbuf.fd_bfreen;
     82 #else
     83     struct statfs fsbuf;
     84 
     85     if (statfs(path, &fsbuf) < 0)
     86 	msg_fatal("statfs %s: %m", path);
     87     sp->block_size = fsbuf.f_bsize;
     88     sp->block_free = fsbuf.f_bavail;
     89 #endif
     90 #endif
     91 #ifdef USE_STATVFS
     92     struct statvfs fsbuf;
     93 
     94     if (statvfs(path, &fsbuf) < 0)
     95 	msg_fatal("statvfs %s: %m", path);
     96     sp->block_size = fsbuf.f_frsize;
     97     sp->block_free = fsbuf.f_bavail;
     98 #endif
     99     if (msg_verbose)
    100 	msg_info("%s: %s: block size %lu, blocks free %lu",
    101 		 myname, path, sp->block_size, sp->block_free);
    102 }
    103 
    104 #ifdef TEST
    105 
    106  /*
    107   * Proof-of-concept test program: print free space unit and count for all
    108   * listed file systems.
    109   */
    110 
    111 #include <vstream.h>
    112 
    113 int     main(int argc, char **argv)
    114 {
    115     struct fsspace sp;
    116 
    117     if (argc == 1)
    118 	msg_fatal("usage: %s filesystem...", argv[0]);
    119 
    120     while (--argc && *++argv) {
    121 	fsspace(*argv, &sp);
    122 	vstream_printf("%10s: block size %lu, blocks free %lu\n",
    123 		       *argv, sp.block_size, sp.block_free);
    124 	vstream_fflush(VSTREAM_OUT);
    125     }
    126     return (0);
    127 }
    128 
    129 #endif
    130