mirror of https://github.com/mkerrisk/man-pages
128 lines
4.0 KiB
Plaintext
128 lines
4.0 KiB
Plaintext
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "FSETPOS" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" fsetpos
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.SH NAME
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fsetpos \- set current file position
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.SH SYNOPSIS
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.LP
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\fB#include <stdio.h>
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.br
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.sp
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int fsetpos(FILE *\fP\fIstream\fP\fB, const fpos_t *\fP\fIpos\fP\fB);
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIfsetpos\fP() function shall set the file position and state
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indicators for the stream pointed to by \fIstream\fP
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according to the value of the object pointed to by \fIpos\fP, which
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the application shall ensure is a value obtained from an
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earlier call to \fIfgetpos\fP() on the same stream. If a read or write
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error occurs, the
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error indicator for the stream shall be set and \fIfsetpos\fP() fails.
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.LP
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A successful call to the \fIfsetpos\fP() function shall clear the
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end-of-file indicator for the stream and undo any effects of
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\fIungetc\fP() on the same stream. After an \fIfsetpos\fP() call,
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the next operation on an
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update stream may be either input or output.
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.LP
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The
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behavior of \fIfsetpos\fP() on devices which are incapable of seeking
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is implementation-defined. The value of the file offset
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associated with such a device is undefined.
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.SH RETURN VALUE
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.LP
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The \fIfsetpos\fP() function shall return 0 if it succeeds; otherwise,
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it shall return a non-zero value and set \fIerrno\fP to
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indicate the error.
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.SH ERRORS
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.LP
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The \fIfsetpos\fP() function shall fail if, \ either the \fIstream\fP
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is unbuffered or the \fIstream\fP's
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buffer needed to be flushed, and the call to \fIfsetpos\fP() causes
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an underlying \fIlseek\fP() or \fIwrite\fP() to be invoked, and:
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.TP 7
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.B EAGAIN
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The O_NONBLOCK flag is set for the file descriptor and the process
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would be delayed in the write operation.
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.TP 7
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.B EBADF
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The file descriptor underlying the stream file is not open for writing
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or the stream's buffer needed to be flushed and the file is
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not open.
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.TP 7
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.B EFBIG
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An
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attempt was made to write a file that exceeds the maximum file size.
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.TP 7
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.B EFBIG
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An attempt was made to write a file that exceeds the process' file
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size limit.
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.TP 7
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.B EFBIG
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The file is a regular file and an attempt was made to write at or
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beyond the offset maximum associated with the corresponding
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stream.
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.TP 7
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.B EINTR
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The write operation was terminated due to the receipt of a signal,
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and no data was transferred.
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.TP 7
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.B EIO
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A
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physical I/O error has occurred, or the process is a member of a background
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process group attempting to perform a \fIwrite\fP() to its controlling
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terminal, TOSTOP is set, the process is neither ignoring nor
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blocking SIGTTOU, and the process group of the process is orphaned.
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This error may also be returned under implementation-defined
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conditions.
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.TP 7
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.B ENOSPC
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There was no free space remaining on the device containing the file.
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.TP 7
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.B ENXIO
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A
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request was made of a nonexistent device, or the request was outside
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the capabilities of the device.
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.TP 7
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.B EPIPE
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The file descriptor underlying \fIstream\fP is associated with a pipe
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or FIFO.
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.TP 7
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.B EPIPE
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An
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attempt was made to write to a pipe or FIFO that is not open for reading
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by any process; a SIGPIPE signal shall also be sent to the
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thread.
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.sp
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIfopen\fP() , \fIftell\fP() , \fIlseek\fP() , \fIrewind\fP() , \fIungetc\fP()
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, \fIwrite\fP() , the
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Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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