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fsetpos(3posix)


NAME

   fsetpos --- set current file position

SYNOPSIS

   #include <stdio.h>

   int fsetpos(FILE *stream, const fpos_t *pos);

DESCRIPTION

   The functionality described on this reference page is aligned with  the
   ISO C  standard.  Any  conflict between the requirements described here
   and the ISO C standard is unintentional. This  volume  of  POSIX.12008
   defers to the ISO C standard.

   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.

   The  fsetpos()  function  shall  not  change  the  setting  of errno if
   successful.

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
          thread 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 file size
          limit of the process.

   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 calling thread is
          not blocking SIGTTOU, the process is not ignoring  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.

   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.

   ESPIPE The file descriptor underlying stream is associated with a pipe,
          FIFO, or socket.

   The fsetpos() function may fail if:

   ENXIO  A request was made of a nonexistent device, or the  request  was
          outside the capabilities of the device.

   The following sections are informative.

EXAMPLES

   None.

APPLICATION USAGE

   None.

RATIONALE

   None.

FUTURE DIRECTIONS

   None.

SEE ALSO

   Section 2.5, Standard I/O Streams, fopen(), ftell(), lseek(), rewind(),
   ungetc(), write()

   The Base Definitions volume of POSIX.12008, <stdio.h>

COPYRIGHT

   Portions of this text are reprinted and reproduced in  electronic  form
   from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
   -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
   Specifications  Issue  7,  Copyright  (C)  2013  by  the  Institute  of
   Electrical and Electronics Engineers, Inc and The Open Group.  (This is
   POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .

   Any  typographical  or  formatting  errors that appear in this page are
   most likely to have been introduced during the conversion of the source
   files    to   man   page   format.   To   report   such   errors,   see
   https://www.kernel.org/doc/man-pages/reporting_bugs.html .



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