FSETPOS(3P)                                         POSIX Programmer's Manual                                        FSETPOS(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       fsetpos - 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 fset-
       pos() 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 out-
       put.

       The behavior of fsetpos() on devices which are incapable of seeking is implementation-defined. The value of the file off-
       set 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 indi-
       cate 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 signal, 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 condi-
              tions.

       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 ALSO
       fopen(), 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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                   FSETPOS(3P)