FSETPOS(P) POSIX Programmer's Manual FSETPOS(P)NAMEfsetpos - set current file position
SYNOPSIS
#include <stdio.h>
int fsetpos(FILE *stream, const fpos_t *pos);
DESCRIPTION
The fsetpos() function shall set the file position and state indicators
for the stream pointed to by stream according to the value of the
object pointed to by pos, which the application shall ensure is a value
obtained from an earlier call to fgetpos() on the same stream. If a
read or write error occurs, the error indicator for the stream shall be
set and fsetpos() fails.
A successful call to the fsetpos() function shall clear the end-of-file
indicator for the stream and undo any effects of ungetc() on the same
stream. After an fsetpos() call, the next operation on an update stream
may be either input or output.
The behavior of fsetpos() on devices which are incapable of seeking is
implementation-defined. The value of the file offset associated with
such a device is undefined.
RETURN VALUE
The fsetpos() function shall return 0 if it succeeds; otherwise, it
shall return a non-zero value and set errno to indicate the error.
ERRORS
The fsetpos() function shall fail if, either the stream is
unbuffered or the stream's buffer needed to be flushed, and the call to
fsetpos() causes an underlying lseek() or write() to be invoked, and:
EAGAIN The O_NONBLOCK flag is set for the file descriptor and the
process would be delayed in the write operation.
EBADF The file descriptor underlying the stream file is not open for
writing or the stream's buffer needed to be flushed and the file
is not open.
EFBIG An attempt was made to write a file that exceeds the maximum
file size.
EFBIG An attempt was made to write a file that exceeds the process'
file size limit.
EFBIG The file is a regular file and an attempt was made to write at
or beyond the offset maximum associated with the corresponding
stream.
EINTR The write operation was terminated due to the receipt of a sig‐
nal, and no data was transferred.
EIO A physical I/O error has occurred, or the process is a member of
a background process group attempting to perform a write() to
its controlling terminal, TOSTOP is set, the process is neither
ignoring nor blocking SIGTTOU, and the process group of the
process is orphaned. This error may also be returned under
implementation-defined conditions.
ENOSPC There was no free space remaining on the device containing the
file.
ENXIO A request was made of a nonexistent device, or the request was
outside the capabilities of the device.
EPIPE The file descriptor underlying stream is associated with a pipe
or FIFO.
EPIPE An attempt was made to write to a pipe or FIFO that is not open
for reading by any process; a SIGPIPE signal shall also be sent
to the thread.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOfopen() , ftell() , lseek() , rewind() , ungetc() , write() , the Base
Definitions volume of IEEE Std 1003.1-2001, <stdio.h>
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 .
IEEE/The Open Group 2003 FSETPOS(P)
