This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       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 .

IEEE/The Open Group                                   2017                                       FSETPOS(3POSIX)

       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.

       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.

       Thefollowingsectionsareinformative.

       None.

       None.

       fsetpos — set current file position

       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.

       None.

       The fsetpos() function shall return 0 if it succeeds; otherwise, it shall return a non-zero value and set
       errno to indicate the error.

Section2.5, StandardI/OStreams, fopen(), ftell(), lseek(), rewind(), ungetc(), write()

       The Base Definitions volume of POSIX.1‐2017, <stdio.h>

       #include <stdio.h>

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