compat/statvfs.cc

   1 #include "squid.h"
   2 #include "compat/statvfs.h"
   3
   4 #if !HAVE_STATVFS
   5
   6 // struct statfs has some member differences between OS versions
   7 #if HAVE_F_FRSIZE_IN_STATFS
   8 #define STATFS_FRSIZE(x) (x).f_frsize
   9 #else
  10 #define STATFS_FRSIZE(x) (x).f_bsize
  11 #endif
  12
  13 int
  14 xstatvfs(const char *path, struct statvfs *sfs)
  15 {
  16 #if !HAVE_STATFS && _SQUID_WINDOWS_
  17     char drive[4];
  18     DWORD spc, bps, freec, totalc;
  19     DWORD vsn, maxlen, flags;
  20
  21     if (!sfs) {
  22         errno = EINVAL;
  23         return -1;
  24     }
  25     strncpy(drive, path, 2);
  26     drive[2] = '\0';
  27     strcat(drive, "\\");
  28
  29     if (!GetDiskFreeSpace(drive, &spc, &bps, &freec, &totalc)) {
  30         errno = ENOENT;
  31         return -1;
  32     }
  33     if (!GetVolumeInformation(drive, NULL, 0, &vsn, &maxlen, &flags, NULL, 0)) {
  34         errno = ENOENT;
  35         return -1;
  36     }
  37
  38     memset(sfs, 0, sizeof(*sfs));
  39
  40     sfs->f_bsize = sfs->f_frsize = spc * bps;         /* file system block size, fragment size */
  41     sfs->f_blocks = totalc;                           /* size of fs in f_frsize units */
  42     sfs->f_bfree = sfs->f_bavail = freec;             /* # free blocks total, and available for unprivileged users */
  43     sfs->f_files = sfs->f_ffree = sfs->f_favail = -1; /* # inodes total, free, and available for unprivileged users */
  44     sfs->f_fsid = vsn;                                /* file system ID */
  45     sfs->f_namemax = maxlen;                          /* maximum filename length */
  46     return 0;
  47
  48 #elif HAVE_STATFS
  49     // use statfs() and map results from struct statfs to struct statvfs
  50     struct statfs tmpSfs;
  51
  52     if (int x = statfs(path, &tmpSfs))
  53         return x;
  54
  55     memset(sfs, 0, sizeof(*sfs));
  56
  57     sfs->f_bsize = tmpSfs.f_bsize;         /* file system block size */
  58     sfs->f_frsize = STATFS_FRSIZE(tmpSfs); /* fragment size */
  59     sfs->f_blocks = tmpSfs.f_blocks;       /* size of fs in f_frsize units */
  60     sfs->f_bfree = tmpSfs.f_bfree;         /* # free blocks */
  61     sfs->f_bavail = tmpSfs.f_bavail;       /* # free blocks for unprivileged users */
  62     sfs->f_files = tmpSfs.f_files;         /* # inodes */
  63     sfs->f_ffree = tmpSfs.f_ffree;         /* # free inodes */
  64     sfs->f_favail = tmpSfs.f_ffree;        /* # free inodes for unprivileged users */
  65     sfs->f_fsid = tmpSfs.f_fsid;           /* file system ID */
  66     sfs->f_namemax = tmpSfs.f_namelen;     /* maximum filename length */
  67
  68 #else
  69 #error Both statvfs() and statfs() system calls are missing.
  70     errno = ENOSYS;
  71     return -1;
  72
  73 #endif
  74 }
  75
  76 #endif /* HAVE_STATVFS */