usr/src/lib/libc/sys/getfsstat.2

.\" Copyright (c) 1989 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted
.\" provided that the above copyright notice and this paragraph are
.\" duplicated in all such forms and that any documentation,
.\" advertising materials, and other materials related to such
.\" distribution and use acknowledge that the software was developed
.\" by the University of California, Berkeley.  The name of the
.\" University may not be used to endorse or promote products derived
.\" from this software without specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"     @(#)getfsstat.2 6.3 (Berkeley) %G%
.\"
.TH GETFSSTAT 2 ""
.UC 7
.SH NAME
getfsstat \- get list of all mounted filesystems
.SH SYNOPSIS
.nf
.ft B
#include <sys/types.h>
#include <sys/mount.h>
.LP
.ft B
getfsstat(buf, bufsize, flags)
struct statfs *buf[];
long bufsize;
int flags;
.fi
.ft R
.SH DESCRIPTION
.I Getfsstat
returns information about all mounted filesystems.
.I Buf
is a pointer to an array of
.I statfs
structures defined as follows:
.IP
.ta \w'#define\0\0'u +\w'fsid_t\0\0'u +\w'f_mntfromname[MNAMELEN]\0\0'u
.nf
typedef quad fsid_t;
.sp 1
#define MNAMELEN 32     /* length of buffer for returned name */
.sp 1
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
.fi
.PP
Fields that are undefined for a particular filesystem are set to \-1.
The buffer is filled with an array of
.I fsstat
structures, one for each mounted filesystem
up to the size specified by
.I bufsize .
.PP
If
.I buf
is given as zero,
.I getfsstat
returns just the number of mounted filesystems.
.PP
Normally
.I flags
should be specified as MNT_WAIT.
If
.I flags
is set to MNT_NOWAIT, then
.I 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
.I getfsstat
will not block waiting for information from a filesystem that is
unable to respond.
.SH RETURN VALUE
Upon successful completion, the number of
.I fsstat
structures is returned.
Otherwise, \-1 is returned and the global variable
.I errno
is set to indicate the error.
.SH ERRORS
.I Getfsstat
fails if one or more of the following are true:
.TP 15
EFAULT
.I Buf
points to an invalid address.
.TP 15
EIO
An I/O error occurred while reading from or writing to the filesystem.
.SH "SEE ALSO"
statfs(2), fstab(5), mount(8)