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83 lines
2.9 KiB
Groff
83 lines
2.9 KiB
Groff
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)truncate.2 8.1 (Berkeley) 6/4/93
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.\"
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.TH TRUNCATE 2 "24 January 1997" GNO "System Calls"
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.SH NAME
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.BR truncate ,
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.BR ftruncate
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\- truncate a file to a specified length
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.SH SYNOPSIS
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#include <unistd.h>
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.sp 1
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int
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\fBtruncate\fR (const char *\fIpath\fR, off_t \fIlength\fR);
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.br
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int
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\fBftruncate\fR (int \fIfd\fR, off_t \fIlength\fR);
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.SH DESCRIPTION
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.BR truncate
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causes the file named by
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.I path
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or referenced by
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.I fd
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to be truncated to at most
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.I length
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bytes in size. If the file previously
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was larger than this size, the extra data
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is lost.
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With
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.BR ftruncate ,
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the file must be open for writing.
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.SH RETURN VALUES
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A value of 0 is returned if the call succeeds. If the call
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fails a -1 is returned, and the global variable
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.IR errno
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specifies the error.
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.SH SEE ALSO
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.BR open (2)
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.SH BUGS
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The GNO implementation of
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.BR truncate
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requires that the file must be able to be opened for writing. If
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this is not possible,
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.BR truncate
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returns -1 and sets
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.IR errno .
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.LP
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These calls should be generalized to allow ranges
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of bytes in a file to be discarded.
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.SH HISTORY
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The
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.BR ftruncate
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function call appeared in 4.2BSD.
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