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GETFSSTAT(2)                BSD Programmer's Manual               GETFSSTAT(2)

     getfsstat - get list of all mounted filesystems

     #include <&lt;sys/param.h>&gt;
     #include <&lt;sys/ucred.h>&gt;
     #include <&lt;sys/mount.h>&gt;

     getfsstat(struct statfs *buf, long bufsize, int flags);

     Getfsstat() returns information about all mounted filesystems.  Buf is a
     pointer to statfs structures defined as follows:

     typedef quad fsid_t;

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

     struct statfs {
             short   f_type;                 /* filesystem type number */
             short   f_flags;                /* copy of mount flags */
             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 filesystem */
             long    f_spare[4];             /* spare for later */
             char    f_fstypename[MFSNAMELEN]; /* fs type name */
             char    f_mntonname[MNAMELEN];  /* directory on which mounted */
             char    f_mntfromname[MNAMELEN];/* mounted filesystem */

     Fields that are undefined for a particular filesystem are set to -1.  The
     buffer is filled with an array of fsstat structures, one for each mounted
     filesystem up to the size specified by bufsize.

     If buf is given as NULL, getfsstat() returns just the number of mounted

     Normally flags should be specified as MNT_WAIT. If flags is set to
     MNT_NOWAIT, getfsstat() will return the information it has available
     without requesting an update from each filesystem.  Thus, some of the in-
     formation will be out of date, but getfsstat() will not block waiting for
     information from a filesystem that is unable to respond.

     Upon successful completion, the number of fsstat structures is returned.
     Otherwise, -1 is returned and the global variable errno is set to indi-
     cate the error.

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

     EFAULT        Buf points to an invalid address.

     EIO           An I/O error occurred while reading from or writing to the

     statfs(2),  fstab(5),  mount(8)

     The getfsstat function first appeared in 4.4BSD.

4.4BSD                           April 3, 1995                               2