NAME

       statvfs, fstatvfs - get filesystem statistics

SYNOPSIS

       #include <sys/statvfs.h>

       int statvfs(const char *path, struct statvfs *buf);
       int fstatvfs(int fd, struct statvfs *buf);

DESCRIPTION

       The  function  statvfs()  returns  information  about  a  mounted filesystem.  path is the
       pathname of any file within the mounted  filesystem.   buf  is  a  pointer  to  a  statvfs
       structure defined approximately as follows:

           struct statvfs {
               unsigned long  f_bsize;    /* filesystem block size */
               unsigned long  f_frsize;   /* fragment size */
               fsblkcnt_t     f_blocks;   /* size of fs in f_frsize units */
               fsblkcnt_t     f_bfree;    /* # free blocks */
               fsblkcnt_t     f_bavail;   /* # free blocks for unprivileged users */
               fsfilcnt_t     f_files;    /* # inodes */
               fsfilcnt_t     f_ffree;    /* # free inodes */
               fsfilcnt_t     f_favail;   /* # free inodes for unprivileged users */
               unsigned long  f_fsid;     /* filesystem ID */
               unsigned long  f_flag;     /* mount flags */
               unsigned long  f_namemax;  /* maximum filename length */
           };

       Here  the  types  fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>.  Both used to be
       unsigned long.

       The field f_flag is a bit mask (of mount flags, see mount(8)).  Bits defined by POSIX are

       ST_RDONLY
              Read-only filesystem.

       ST_NOSUID
              Set-user-ID/set-group-ID bits are ignored by exec(3).

       It is unspecified whether all members of the returned struct have meaningful values on all
       filesystems.

       fstatvfs() returns the same information about an open file referenced by descriptor fd.

RETURN VALUE

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

ERRORS

       EACCES (statvfs()) Search permission is denied for a component of the path prefix of path.
              (See also path_resolution(7).)

       EBADF  (fstatvfs()) fd is not a valid open file descriptor.

       EFAULT Buf or path points to an invalid address.

       EINTR  This call was interrupted by a signal.

       EIO    An I/O error occurred while reading from the filesystem.

       ELOOP  (statvfs()) Too many symbolic links were encountered in translating path.

       ENAMETOOLONG
              (statvfs()) path is too long.

       ENOENT (statvfs()) The file referred to by path does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOSYS The filesystem does not support this call.

       ENOTDIR
              (statvfs()) A component of the path prefix of path is not a directory.

       EOVERFLOW
              Some values were too large to be represented in the returned struct.

CONFORMING TO

       POSIX.1-2001.

NOTES

       The Linux kernel has system calls statfs(2) and fstatfs(2) to support this library call.

       The current glibc implementations of

          pathconf(path, _PC_REC_XFER_ALIGN);
          pathconf(path, _PC_ALLOC_SIZE_MIN);
          pathconf(path, _PC_REC_MIN_XFER_SIZE);

       respectively use the f_frsize, f_frsize,  and  f_bsize  fields  of  the  return  value  of
       statvfs(path,buf).

SEE ALSO

       statfs(2)

COLOPHON

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