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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. 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 March 30, 2020
-.Dt TRUNCATE 2
-.Os
-.Sh NAME
-.Nm truncate ,
-.Nm ftruncate
-.Nd truncate or extend a file to a specified length
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn truncate "const char *path" "off_t length"
-.Ft int
-.Fn ftruncate "int fd" "off_t length"
-.Sh DESCRIPTION
-The
-.Fn truncate
-system call
-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.
-.Pp
-The
-.Fn ftruncate
-system call causes the file or shared memory object backing the file descriptor
-.Fa fd
-to be truncated or extended to
-.Fa length
-bytes in size.
-The file descriptor must be a valid file descriptor open for writing.
-The file position pointer associated with the file descriptor
-.Fa fd
-will not be modified.
-.Sh RETURN VALUES
-.Rv -std
-If the file to be modified is not a directory or
-a regular file, the
-.Fn truncate
-call has no effect and returns the value 0.
-.Sh ERRORS
-The
-.Fn truncate
-system call
-succeeds unless:
-.Bl -tag -width Er
-.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 EPERM
-The named file has its immutable or append-only flag set, see the
-.Xr chflags 2
-manual page for more information.
-.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 EFBIG
-The
-.Fa length
-argument was greater than the maximum file size.
-.It Bq Er EINVAL
-The
-.Fa length
-argument was less than 0.
-.It Bq Er EIO
-An I/O error occurred updating the inode.
-.It Bq Er EINTEGRITY
-Corrupted data was detected while reading from the file system.
-.It Bq Er EFAULT
-The
-.Fa path
-argument
-points outside the process's allocated address space.
-.El
-.Pp
-The
-.Fn ftruncate
-system call
-succeeds unless:
-.Bl -tag -width Er
-.It Bq Er EBADF
-The
-.Fa fd
-argument
-is not a valid descriptor.
-.It Bq Er EINVAL
-The
-.Fa fd
-argument
-references a file descriptor that is not a regular file or shared memory object.
-.It Bq Er EINVAL
-The
-.Fa fd
-descriptor
-is not open for writing.
-.El
-.Sh SEE ALSO
-.Xr chflags 2 ,
-.Xr open 2 ,
-.Xr shm_open 2
-.Sh HISTORY
-The
-.Fn truncate
-and
-.Fn ftruncate
-system calls appeared in
-.Bx 4.2 .
-.Sh BUGS
-These calls should be generalized to allow ranges
-of bytes in a file to be discarded.
-.Pp
-Historically, the use of
-.Fn truncate
-or
-.Fn ftruncate
-to extend a file was not portable, but this behavior became required in
-.St -p1003.1-2008 .