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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 dif-
       fer (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 opera-
              tion.

       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 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 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)