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 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.1‐2017 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.1‐2017, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       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 .