ftello (3p) - Linux Manuals
ftello: return a file offset in a stream
PROLOGThis 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.
ftell, ftello - return a file offset in a stream
long ftell(FILE *stream);
The ftell() function shall obtain the current value of the file-position indicator for the stream pointed to by stream.
Upon successful completion, ftell() and ftello()
The ftell() and ftello() functions shall fail if:
- The file descriptor underlying stream is not an open file descriptor.
- For ftell(), the current file offset cannot be represented correctly in an object of type long.
- For ftello(), the current file offset cannot be represented correctly in an object of type off_t.
The file descriptor underlying stream is associated with a pipe
The ftell() function may fail if:
The file descriptor underlying stream is associated with a socket.
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .