getfsstat man page on 4.4BSD

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GETFSSTAT(2)		    BSD System Calls Manual		  GETFSSTAT(2)

NAME
     getfsstat — get list of all mounted filesystems

SYNOPSIS
     #include <sys/param.h>
     #include <sys/ucred.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 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 */
     };

     The flags that may be returned include:

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

     MNT_NOEXEC	       Files may not be executed from the filesystem.

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

     MNT_NODEV	       Special files in the filesystem may not be opened.

     MNT_SYNCHRONOUS   All I/O to the filesystem is done synchronously.

     MNT_ASYNCHRONOUS  No filesystem I/O is done synchronously.

     MNT_LOCAL	       The filesystem resides locally.

     MNT_QUOTA	       The filesystem has quotas enabled on it.

     MNT_ROOTFS	       Identifies the root filesystem.

     MNT_EXRDONLY      The filesystem is exported read-only.

     MNT_EXPORTED      The filesystem is exported for both reading and writ‐
		       ing.

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

     MNT_EXPORTANON    The filesystem maps all remote accesses to the anony‐
		       mous user.

     MNT_EXKERB	       The filesystem is exported with Kerberos uid mapping.

     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 indi‐
     cate 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 first appeared in 4.4BSD.

BSD				 May 25, 1995				   BSD
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