fstatvfs(2)

1STATVFS(2)                 Linux Programmer's Manual                STATVFS(2)
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NAME

6       statvfs, fstatvfs - get file system statistics
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SYNOPSIS

9       #include <sys/statvfs.h>
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11       int statvfs(const char *path, struct statvfs *buf);
12       int fstatvfs(int fd, struct statvfs *buf);
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DESCRIPTION

15       The function statvfs() returns information about a mounted file system.
16       path is the pathname of any file within the mounted filesystem.  buf is
17       a pointer to a statvfs structure defined approximately as follows:
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19         struct statvfs {
20           unsigned long  f_bsize;    /* file system block size */
21           unsigned long  f_frsize;   /* fragment size */
22           fsblkcnt_t     f_blocks;   /* size of fs in f_frsize units */
23           fsblkcnt_t     f_bfree;    /* # free blocks */
24           fsblkcnt_t     f_bavail;   /* # free blocks for non-root */
25           fsfilcnt_t     f_files;    /* # inodes */
26           fsfilcnt_t     f_ffree;    /* # free inodes */
27           fsfilcnt_t     f_favail;   /* # free inodes for non-root */
28           unsigned long  f_fsid;     /* file system ID */
29           unsigned long  f_flag;     /* mount flags */
30           unsigned long  f_namemax;  /* maximum filename length */
31         };
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33       Here  the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>.
34       Both used to be unsigned long.
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36       The field f_flag is a bit mask (of mount flags,  see  mount(8)).   Bits
37       defined by POSIX are
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39       ST_RDONLY
40              Read-only file system.
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42       ST_NOSUID
43              Set-user-ID/set-group-ID bits are ignored by exec(2).
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45       It is unspecified whether all members of the returned struct have mean‐
46       ingful values on all filesystems.
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48       fstatvfs() returns the same information about an open  file  referenced
49       by descriptor fd.
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RETURN VALUE

52       On  success,  zero is returned.  On error, -1 is returned, and errno is
53       set appropriately.
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ERRORS

56       EACCES (statvfs()) Search permission is denied for a component  of  the
57              path prefix of path.  (See also path_resolution(2).)
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59       EBADF  (fstatvfs()) fd is not a valid open file descriptor.
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61       EFAULT Buf or path points to an invalid address.
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63       EINTR  This call was interrupted by a signal.
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65       EIO    An I/O error occurred while reading from the file system.
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67       ELOOP  (statvfs())  Too  many symbolic links were encountered in trans‐
68              lating path.
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70       ENAMETOOLONG
71              (statvfs()) path is too long.
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73       ENOENT (statvfs()) The file referred to by path does not exist.
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75       ENOMEM Insufficient kernel memory was available.
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77       ENOSYS The file system does not support this call.
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79       ENOTDIR
80              (statvfs()) A component of the path prefix  of  path  is  not  a
81              directory.
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83       EOVERFLOW
84              Some  values  were  too  large to be represented in the returned
85              struct.
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CONFORMING TO

88       POSIX.1-2001
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NOTES

91       The Linux kernel has system calls statfs()  and  fstatfs()  to  support
92       this library call.
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94       The current glibc implementations of
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96          pathconf(path, _PC_REC_XFER_ALIGN);
97          pathconf(path, _PC_ALLOC_SIZE_MIN);
98          pathconf(path, _PC_REC_MIN_XFER_SIZE);
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100       respectively  use  the  f_frsize,  f_frsize,  and f_bsize fields of the
101       return value of statvfs(path,buf).
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