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Diffstat (limited to 'lib/libc/sys/getfsstat.2')
| -rw-r--r-- | lib/libc/sys/getfsstat.2 | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/libc/sys/getfsstat.2 b/lib/libc/sys/getfsstat.2 new file mode 100644 index 0000000..9d2a0d7 --- /dev/null +++ b/lib/libc/sys/getfsstat.2 @@ -0,0 +1,135 @@ +.\" Copyright (c) 1989, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)getfsstat.2 8.1 (Berkeley) 6/9/93 +.\" +.Dd June 9, 1993 +.Dt GETFSSTAT 2 +.Os +.Sh NAME +.Nm getfsstat +.Nd get list of all mounted filesystems +.Sh SYNOPSIS +.Fd #include <sys/param.h> +.Fd #include <sys/ucred.h> +.Fd #include <sys/mount.h> +.Ft int +.Fn getfsstat "struct statfs *buf" "long bufsize" "int flags" +.Sh DESCRIPTION +.Fn Getfsstat +returns information about all mounted filesystems. +.Fa Buf +is a pointer to +.Xr statfs +structures defined as follows: +.Bd -literal +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_bsize; /* fundamental filesystem block size */ + long f_iosize; /* 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 +.Ed +.Pp +Fields that are undefined for a particular filesystem are set to -1. +The buffer is filled with an array of +.Fa fsstat +structures, one for each mounted filesystem +up to the size specified by +.Fa bufsize . +.Pp +If +.Fa buf +is given as NULL, +.Fn getfsstat +returns just the number of mounted filesystems. +.Pp +Normally +.Fa flags +should be specified as +.Dv MNT_WAIT . +If +.Fa flags +is set to +.Dv MNT_NOWAIT , +.Fn 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 +.Fn getfsstat +will not block waiting for information from a filesystem that is +unable to respond. +.Sh RETURN VALUES +Upon successful completion, the number of +.Fa fsstat +structures is returned. +Otherwise, -1 is returned and the global variable +.Va errno +is set to indicate the error. +.Sh ERRORS +.Fn Getfsstat +fails if one or more of the following are true: +.Bl -tag -width Er +.It EFAULT +.Fa Buf +points to an invalid address. +.It EIO +An +.Tn I/O +error occurred while reading from or writing to the filesystem. +.El +.Sh SEE ALSO +.Xr statfs 2 , +.Xr fstab 5 , +.Xr mount 8 +.Sh HISTORY +The +.Nm getfsstat +function first appeared in 4.4BSD. |
