statvfs - phpMan

STATVFS(2)                 Linux Programmer’s Manual                STATVFS(2)



NAME
       statvfs, fstatvfs - get file system 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 file system.  path is the
       path name 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;    /* file system 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 non-root */
           fsfilcnt_t     f_files;    /* # inodes */
           fsfilcnt_t     f_ffree;    /* # free inodes */
           fsfilcnt_t     f_favail;   /* # free inodes for non-root */
           unsigned long  f_fsid;     /* file system 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 file system.

       ST_NOSUID
              Setuid/setgid bits are ignored by exec(2).


       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 appropri-
       ately.

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

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

       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.

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

       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 file system.

       ENOMEM Insufficient kernel memory was available.

       ENOSYS The file system does not support this call.

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


CONFORMING TO
       Solaris, Irix, POSIX 1003.1-2001

NOTES
       The Linux kernel has system calls statfs, fstatfs to support this library call.

       The current glibc implementation of

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

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

SEE ALSO
       statfs(2)



Linux 2.6.0                       2003-08-22                        STATVFS(2)

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