GETFSSTAT(2)              386BSD Programmer's Manual              GETFSSTAT(2)

NAME
     getfsstat - get list of all mounted filesystems

SYNOPSIS
     #include <sys/types.h>
     #include <sys/mount.h>

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

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

     typedef quad fsid_t;

     #define MNAMELEN 32     /* length of buffer for returned name */

     struct statfs {
         short   f_type;     /* type of filesystem (see below) */
         short   f_flags;    /* copy of mount flags */
         long    f_fsize;    /* fundamental filesystem block size */
         long    f_bsize;    /* optimal transfer block size */
         long    f_blocks;   /* total data blocks in filesystem */
         long    f_bfree;    /* free blocks in fs */
         long    f_bavail;   /* free blocks avail to non-superuser */
         long    f_files;    /* total file nodes in filesystem */
         long    f_ffree;    /* free file nodes in fs */
         fsid_t  f_fsid;     /* filesystem id */
         long    f_spare[6]; /* spare for later */
         char    f_mntonname[MNAMELEN]; /* directory on which mounted */
         char    f_mntfromname[MNAMELEN]; /* mounted filesystem */
     };
     /*
      * File system types.
      */
     #define MOUNT_UFS       1
     #define MOUNT_NFS       2
     #define MOUNT_PC        3

     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
     filesystems.

     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
     information will be out of date, but getfsstat() will not block waiting
     for information from a filesystem that is unable to respond.

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

ERRORS
     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
                   filesystem.

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

HISTORY
     The getfsstat function call is currently under development.

BSD Experimental                 July 23, 1991                               2