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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 (consult 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 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 ALSO
       fopen(),  ftell(), lseek(), rewind(), ungetc(), write(), the Base Defi-
       nitions 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(3P)