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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "FTRUNCATE" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" ftruncate 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+ftruncate \- truncate a file to a specified length
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int ftruncate(int\fP \fIfildes\fP\fB, off_t\fP \fIlength\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+If \fIfildes\fP is not a valid file descriptor open for writing, the
+\fIftruncate\fP() function shall fail.
+.LP
+If \fIfildes\fP refers to a regular file, the \fIftruncate\fP() function
+shall cause the size of the file to be truncated to
+\fIlength\fP. If the size of the file previously exceeded \fIlength\fP,
+the extra data shall no longer be available to reads on
+the file. If the file previously was smaller than this size, \fIftruncate\fP()
+shall either increase the size of the file or fail.
+\ XSI-conformant systems shall increase the size of the file. 
+If the file size is increased, the extended area shall appear as if
+it were zero-filled. The value of the seek pointer shall not be
+modified by a call to \fIftruncate\fP().
+.LP
+Upon successful completion, if \fIfildes\fP refers to a regular file,
+the \fIftruncate\fP() function shall mark for update the
+\fIst_ctime\fP and \fIst_mtime\fP fields of the file and the S_ISUID
+and S_ISGID bits of the file mode may be cleared. If the
+\fIftruncate\fP() function is unsuccessful, the file is unaffected.
+.LP
+If the request would cause the file size to exceed the soft file size
+limit for the process, the request shall fail and the
+implementation shall generate the SIGXFSZ signal for the thread. 
+.LP
+If \fIfildes\fP refers to a directory, \fIftruncate\fP() shall fail.
+.LP
+If \fIfildes\fP refers to any other file type, except a shared memory
+object, the result is unspecified.
+.LP
+If \fIfildes\fP refers to a shared memory object, \fIftruncate\fP()
+shall set the size of the shared memory object to
+\fIlength\fP. 
+.LP
+If the effect of \fIftruncate\fP() is to decrease the size of a shared
+memory object or memory mapped file and whole pages beyond
+the new end were previously mapped, then the whole pages beyond the
+new end shall be discarded. 
+.LP
+If the Memory Protection option is supported, references to discarded
+pages shall result in the generation of a SIGBUS signal;
+otherwise, the result of such references is undefined. 
+.LP
+If the effect of \fIftruncate\fP() is to increase the size of a shared
+memory object, it is unspecified whether the contents of
+any mapped pages between the old end-of-file and the new are flushed
+to the underlying object. 
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIftruncate\fP() shall return 0; otherwise,
+-1 shall be returned and \fIerrno\fP set to indicate
+the error.
+.SH ERRORS
+.LP
+The \fIftruncate\fP() function shall fail if:
+.TP 7
+.B EINTR
+A signal was caught during execution.
+.TP 7
+.B EINVAL
+The \fIlength\fP argument was less than 0.
+.TP 7
+.B EFBIG \fRor\fP EINVAL
+.sp
+The \fIlength\fP argument was greater than the maximum file size.
+.TP 7
+.B EFBIG
+The file is a regular file and \fIlength\fP is greater than the offset
+maximum established in the open file description associated
+with \fIfildes\fP. 
+.TP 7
+.B EIO
+An I/O error occurred while reading from or writing to a file system.
+.TP 7
+.B EBADF \fRor\fP EINVAL
+.sp
+The \fIfildes\fP argument is not a file descriptor open for writing.
+.TP 7
+.B EINVAL
+The \fIfildes\fP argument references a file that was opened without
+write permission.
+.TP 7
+.B EROFS
+The named file resides on a read-only file system.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+The \fIftruncate\fP() function is part of IEEE\ Std\ 1003.1-2001 as
+it was deemed to be more useful than \fItruncate\fP(). The \fItruncate\fP()
+function is
+provided as an XSI extension.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIopen\fP(), \fItruncate\fP(), the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .