FSETPOS(3P)               POSIX Programmer's Manual              FSETPOS(3P)

PROLOG         top

       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         top

       fsetpos — set current file position

SYNOPSIS         top

       #include <stdio.h>

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

DESCRIPTION         top

       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.1‐2008 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

RETURN VALUE         top

       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         top

       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

       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

       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         top




RATIONALE         top




SEE ALSO         top

       Section 2.5, Standard I/O Streams, fopen(3p), ftell(3p), lseek(3p),
       rewind(3p), ungetc(3p), write(3p)

       The Base Definitions volume of POSIX.1‐2008, stdio.h(0p)

COPYRIGHT         top

       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 .

       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 .

IEEE/The Open Group                 2013                         FSETPOS(3P)