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-.\" Copyright (c) 1983, 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.
-.\"
-.\"     @(#)truncate.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd June 4, 1993
-.Dt TRUNCATE 2
-.Os BSD 4.2
-.Sh NAME
-.Nm truncate ,
-.Nm ftruncate
-.Nd truncate or extend a file to a specified length
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.Ft int
-.Fn truncate "const char *path" "off_t length"
-.Ft int
-.Fn ftruncate "int fd" "off_t length"
-.Sh DESCRIPTION
-.Fn Truncate
-causes the file named by
-.Fa path
-or referenced by
-.Fa fd
-to be truncated or extended to
-.Fa length
-bytes in size.  If the file
-was larger than this size, the extra data
-is lost.
-If the file was smaller than this size,
-it will be extended as if by writing bytes
-with the value zero.
-With
-.Fn ftruncate ,
-the file must be open for writing.
-.Sh RETURN VALUES
-A value of 0 is returned if the call succeeds.  If the call
-fails a -1 is returned, and the global variable
-.Va errno
-specifies the error.
-.Sh ERRORS
-.Fn Truncate
-succeeds unless:
-.Bl -tag -width [ENOTDIR]
-.It Bq Er ENOTDIR
-A component of the path prefix is not a directory.
-.It Bq Er ENAMETOOLONG
-A component of a pathname exceeded 255 characters,
-or an entire path name exceeded 1023 characters.
-.It Bq Er ENOENT
-The named file does not exist.
-.It Bq Er EACCES
-Search permission is denied for a component of the path prefix.
-.It Bq Er EACCES
-The named file is not writable by the user.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating the pathname.
-.It Bq Er EISDIR
-The named file is a directory.
-.It Bq Er EROFS
-The named file resides on a read-only file system.
-.It Bq Er ETXTBSY
-The file is a pure procedure (shared text) file that is being executed.
-.It Bq Er EIO
-An I/O error occurred updating the inode.
-.It Bq Er EFAULT
-.Fa Path
-points outside the process's allocated address space.
-.El
-.Pp
-.Fn Ftruncate
-succeeds unless:
-.Bl -tag -width [ENOTDIR]
-.It Bq Er EBADF
-The
-.Fa fd
-is not a valid descriptor.
-.It Bq Er EINVAL
-The
-.Fa fd
-references a socket, not a file.
-.It Bq Er EINVAL
-The
-.Fa fd
-is not open for writing.
-.El
-.Sh SEE ALSO
-.Xr open 2
-.Sh BUGS
-These calls should be generalized to allow ranges
-of bytes in a file to be discarded.
-.Pp
-Use of
-.Fn truncate
-to extend a file is not portable.
-.Sh HISTORY
-The
-.Fn truncate
-function call appeared in
-.Bx 4.2 .