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.
fgetpos — get current file position information
int fgetpos(FILE *restrict stream, fpos_t *restrict pos);
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 fgetpos() function shall store the current values of
the parse state (if any) and file position indicator for the stream pointed
to by stream in the object pointed to by pos. The value stored
contains unspecified information usable by fsetpos() for
repositioning the stream to its position at the time of the call to
The fgetpos() function shall not change the setting of
errno if successful.
Upon successful completion, fgetpos() shall return 0; otherwise, it shall
return a non-zero value and set errno to indicate the error.
The fgetpos() function shall fail if:
- The file descriptor underlying stream is not valid.
- The current value of the file position cannot be represented correctly in
an object of type fpos_t.
- The file descriptor underlying stream is associated with a pipe,
FIFO, or socket.
The following sections are informative.
Section 2.5, Standard I/O Streams, fopen(),
ftell(), rewind(), ungetc()
The Base Definitions volume of POSIX.1‐2008,
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 .
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