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STATFS(2)                 FreeBSD System Calls Manual                STATFS(2)

     statfs - get file system statistics

     Standard C Library (libc, -lc)

     #include <sys/param.h>
     #include <sys/mount.h>

     statfs(const char *path, struct statfs *buf);

     fstatfs(int fd, struct statfs *buf);

     Statfs() returns information about a mounted file system.  Path is the
     path name of any file within the mounted file system.  Buf is a pointer
     to a statfs() structure defined as follows:

     typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */

      * file system statistics

     #define MFSNAMELEN 16   /* length of fs type name, including null */
     #define MNAMELEN   90   /* length of buffer for returned name */

     struct statfs {
     long    f_bsize;          /* fundamental file system block size */
     long    f_iosize;         /* optimal transfer block size */
     long    f_blocks;         /* total data blocks in file system */
     long    f_bfree;          /* free blocks in fs */
     long    f_bavail;         /* free blocks avail to non-superuser */
     long    f_files;          /* total file nodes in file system */
     long    f_ffree;          /* free file nodes in fs */
     fsid_t  f_fsid;           /* file system id */
     uid_t   f_owner;          /* user that mounted the file system */
     int     f_type;           /* type of file system */
     int     f_flags;          /* copy of mount flags */
     long    f_syncwrites;     /* count of sync writes since mount */
     long    f_asyncwrites;    /* count of async writes since mount */
     char    f_fstypename[MFSNAMELEN];/* fs type name */
     char    f_mntonname[MNAMELEN];   /* mount point */
     long    f_syncreads;             /* count of sync reads since mount */
     long    f_asyncreads;            /* count of async reads since mount */
     char    f_mntfromname[MNAMELEN]; /* mounted file system */
     The flags that may be returned include:

     MNT_RDONLY       The file system is mounted read-only; Even the super-
                      user may not write on it.

     MNT_NOEXEC       Files may not be executed from the file system.

     MNT_NOSUID       Setuid and setgid bits on files are not honored when
                      they are executed.

     MNT_NODEV        Special files in the file system may not be opened.

     MNT_SYNCHRONOUS  All I/O to the file system is done synchronously.

     MNT_ASYNC        No file system I/O is done synchronously.

     MNT_LOCAL        The file system resides locally.

     MNT_QUOTA        The file system has quotas enabled on it.

     MNT_ROOTFS       Identifies the root file system.

     MNT_EXRDONLY     The file system is exported read-only.

     MNT_EXPORTED     The file system is exported for both reading and

     MNT_DEFEXPORTED  The file system is exported for both reading and writing
                      to any Internet host.

     MNT_EXPORTANON   The file system maps all remote accesses to the
                      anonymous user.

     MNT_EXKERB       The file system is exported with Kerberos uid mapping.

     Fields that are undefined for a particular file system are set to -1.
     Fstatfs() returns the same information about an open file referenced by
     descriptor fd.

     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the

     Statfs() fails if one or more of the following are true:

     [ENOTDIR]          A component of the path prefix of Path is not a

     [ENAMETOOLONG]     The length of a component of path exceeds 255
                        characters, or the length of path exceeds 1023

     [ENOENT]           The file referred to by path does not exist.

     [EACCES]           Search permission is denied for a component of the
                        path prefix of path.

     [ELOOP]            Too many symbolic links were encountered in
                        translating path.

     [EFAULT]           Buf or path points to an invalid address.

     [EIO]              An I/O error occurred while reading from or writing to
                        the file system.

     Fstatfs() fails if one or more of the following are true:

     [EBADF]            fd is not a valid open file descriptor.

     [EFAULT]           Buf points to an invalid address.

     [EIO]              An I/O error occurred while reading from or writing to
                        the file system.

     The statfs() function first appeared in 4.4BSD.

FreeBSD 11.0-PRERELEASE          May 24, 1995          FreeBSD 11.0-PRERELEASE


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