statvfs.cc
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1 /*
2  * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
3  *
4  * Squid software is distributed under GPLv2+ license and includes
5  * contributions from numerous individuals and organizations.
6  * Please see the COPYING and CONTRIBUTORS files for details.
7  */
8 
9 #include "squid.h"
10 #include "compat/statvfs.h"
11 
12 #if !HAVE_STATVFS
13 
14 // struct statfs has some member differences between OS versions
15 #if HAVE_F_FRSIZE_IN_STATFS
16 #define STATFS_FRSIZE(x) (x).f_frsize
17 #else
18 #define STATFS_FRSIZE(x) (x).f_bsize
19 #endif
20 
21 int
22 xstatvfs(const char *path, struct statvfs *sfs)
23 {
24 #if !HAVE_STATFS && _SQUID_WINDOWS_
25  char drive[4];
26  DWORD spc, bps, freec, totalc;
27  DWORD vsn, maxlen, flags;
28 
29  if (!sfs) {
30  errno = EINVAL;
31  return -1;
32  }
33  strncpy(drive, path, 2);
34  drive[2] = '\0';
35  strcat(drive, "\\");
36 
37  if (!GetDiskFreeSpace(drive, &spc, &bps, &freec, &totalc)) {
38  errno = ENOENT;
39  return -1;
40  }
41  if (!GetVolumeInformation(drive, nullptr, 0, &vsn, &maxlen, &flags, nullptr, 0)) {
42  errno = ENOENT;
43  return -1;
44  }
45 
46  memset(sfs, 0, sizeof(*sfs));
47 
48  sfs->f_bsize = sfs->f_frsize = spc * bps; /* file system block size, fragment size */
49  sfs->f_blocks = totalc; /* size of fs in f_frsize units */
50  sfs->f_bfree = sfs->f_bavail = freec; /* # free blocks total, and available for unprivileged users */
51  sfs->f_files = sfs->f_ffree = sfs->f_favail = -1; /* # inodes total, free, and available for unprivileged users */
52  sfs->f_fsid = vsn; /* file system ID */
53  sfs->f_namemax = maxlen; /* maximum filename length */
54  return 0;
55 
56 #elif HAVE_STATFS
57  // use statfs() and map results from struct statfs to struct statvfs
58  struct statfs tmpSfs;
59 
60  if (int x = statfs(path, &tmpSfs))
61  return x;
62 
63  memset(sfs, 0, sizeof(*sfs));
64 
65  sfs->f_bsize = tmpSfs.f_bsize; /* file system block size */
66  sfs->f_frsize = STATFS_FRSIZE(tmpSfs); /* fragment size */
67  sfs->f_blocks = tmpSfs.f_blocks; /* size of fs in f_frsize units */
68  sfs->f_bfree = tmpSfs.f_bfree; /* # free blocks */
69  sfs->f_bavail = tmpSfs.f_bavail; /* # free blocks for unprivileged users */
70  sfs->f_files = tmpSfs.f_files; /* # inodes */
71  sfs->f_ffree = tmpSfs.f_ffree; /* # free inodes */
72  sfs->f_favail = tmpSfs.f_ffree; /* # free inodes for unprivileged users */
73  sfs->f_fsid = tmpSfs.f_fsid; /* file system ID */
74  sfs->f_namemax = tmpSfs.f_namelen; /* maximum filename length */
75 
76 #else
77 #error Both statvfs() and statfs() system calls are missing.
78  errno = ENOSYS;
79  return -1;
80 
81 #endif
82 }
83 
84 #endif /* HAVE_STATVFS */
85 
fsfilcnt_t f_favail
Definition: statvfs.h:51
fsblkcnt_t f_bfree
Definition: statvfs.h:47
fsblkcnt_t f_blocks
Definition: statvfs.h:46
int xstatvfs(const char *path, struct statvfs *sfs)
Definition: statvfs.cc:22
fsfilcnt_t f_files
Definition: statvfs.h:49
fsfilcnt_t f_ffree
Definition: statvfs.h:50
#define STATFS_FRSIZE(x)
Definition: statvfs.cc:18
unsigned long f_fsid
Definition: statvfs.h:52
unsigned long f_frsize
Definition: statvfs.h:45
fsblkcnt_t f_bavail
Definition: statvfs.h:48
unsigned long f_namemax
Definition: statvfs.h:54
unsigned long f_bsize
Definition: statvfs.h:44

 

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