STATVFS(3) Linux Programmer's Manual STATVFS(3)

NAME
       statvfs, fstatvfs - get file system statistics

SYNOPSIS
       #include 

       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 pathname of any file within the mounted file  system.   buf
       is a pointer to a statvfs structure defined approximately as follows:

           struct statvfs {
               unsigned long  fbsize;    /* file system block size */
               unsigned long  ffrsize;   /* fragment size */
               fsblkcntt     fblocks;   /* size of fs in ffrsize units */
               fsblkcntt     fbfree;    /* # free blocks */
               fsblkcntt     fbavail;   /* # free blocks for unprivileged users */
               fsfilcntt     ffiles;    /* # inodes */
               fsfilcntt     fffree;    /* # free inodes */
               fsfilcntt     ffavail;   /* # free inodes for unprivileged users */
               unsigned long  ffsid;     /* file system ID */
               unsigned long  fflag;     /* mount flags */
               unsigned long  fnamemax;  /* maximum filename length */
           };

       Here  the types fsblkcntt and fsfilcntt are defined in .
       Both used to be unsigned long.

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

       STRDONLY
              Read-only file system.

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

       It is unspecified whether all members of the returned struct have mean‐
       ingful values on all file systems.

       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 pathresolution(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 file system.

       ELOOP  (statvfs())  Too  many symbolic links were encountered in trans‐
              lating 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 file system 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.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       ┌──────────────────────┬───────────────┬─────────┐
       │Interface             │ Attribute     │ Value   │
       ├──────────────────────┼───────────────┼─────────┤
       │statvfs(), fstatvfs() │ Thread safety │ MT-Safe │
       └──────────────────────┴───────────────┴─────────┘
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, PCRECXFERALIGN);
          pathconf(path, PCALLOCSIZEMIN);
          pathconf(path, PCRECMINXFERSIZE);

       respectively use the ffrsize, ffrsize,  and  fbsize  fields  of  the
       return value of statvfs(path,buf).

SEE ALSO
       statfs(2)

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             2003-08-22                        STATVFS(3)