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       statvfs, fstatvfs - get filesystem statistics


       #include <sys/statvfs.h>

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


       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;    /* Number of free blocks */
               fsblkcnt_t     f_bavail;   /* Number of free blocks for
                                             unprivileged users */
               fsfilcnt_t     f_files;    /* Number of inodes */
               fsfilcnt_t     f_ffree;    /* Number of free inodes */
               fsfilcnt_t     f_favail;   /* Number of 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 indicating various options that were employed when mounting
       this filesystem.  It contains zero or more of the following flags:

              Mandatory locking is permitted on the filesystem (see fcntl(2)).

              Do not update access times; see mount(2).

              Disallow access to device special files on this filesystem.

              Do not update directory access times; see mount(2).

              Execution of programs is disallowed on this filesystem.

              The  set-user-ID  and set-group-ID bits are ignored by exec(3) for executable files
              on this filesystem

              This filesystem is mounted read-only.

              Update atime relative to mtime/ctime; see mount(2).

              Writes are synched to the filesystem immediately (see the description of O_SYNC  in

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

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


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


       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; see signal(7).

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

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

              (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.

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

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


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

       │InterfaceAttributeValue   │
       │statvfs(), fstatvfs() │ Thread safety │ MT-Safe │


       POSIX.1-2001, POSIX.1-2008.

       Only  the  ST_NOSUID and ST_RDONLY flags of the f_flag field are specified in POSIX.1.  To
       obtain definitions of the remaining flags, one must define _GNU_SOURCE.


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

       In glibc versions before 2.13, statvfs()  populated  the  bits  of  the  f_flag  field  by
       scanning  the  mount  options shown in /proc/mounts.  However, starting with Linux 2.6.36,
       the underlying statfs(2) system call provides the necessary information  via  the  f_flags
       field, and since glibc version 2.13, the statvfs() function will use information from that
       field rather than scanning /proc/mounts.

       The 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  returned  by  a  call  to
       statvfs() with the argument path.




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