external/ibm-public/postfix/dist/src/util/fsspace.c

   1 /*      $NetBSD$        */
   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