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DESCRIPTION

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 writing.

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 Thus, some of the information will be out of date, but getfsstat() will not block waiting for information from a filesystem that is unable to respond.