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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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FTELL(3P) POSIX Programmer's Manual FTELL(3P)
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.
ftell, ftello — return a file offset in a stream
#include <stdio.h>
long ftell(FILE *stream);
off_t ftello(FILE *stream);
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 ftell() function shall obtain the current value of the file-
position indicator for the stream pointed to by stream.
The ftell() function shall not change the setting of errno if
successful.
The ftello() function shall be equivalent to ftell(), except that
the return value is of type off_t and the ftello() function may
change the setting of errno if successful.
Upon successful completion, ftell() and ftello() shall return the
current value of the file-position indicator for the stream
measured in bytes from the beginning of the file.
Otherwise, ftell() and ftello() shall return -1, and set errno to
indicate the error.
The ftell() and ftello() functions shall fail if:
EBADF The file descriptor underlying stream is not an open file
descriptor.
EOVERFLOW
For ftell(), the current file offset cannot be represented
correctly in an object of type long.
EOVERFLOW
For ftello(), the current file offset cannot be
represented correctly in an object of type off_t.
ESPIPE The file descriptor underlying stream is associated with a
pipe, FIFO, or socket.
The following sections are informative.
None.
None.
None.
None.
Section 2.5, Standard I/O Streams, fgetpos(3p), fopen(3p),
fseek(3p), lseek(3p)
The Base Definitions volume of POSIX.1‐2017, stdio.h(0p)
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 FTELL(3P)
Pages that refer to this page: stdio.h(0p), fgetpos(3p), fseek(3p), fsetpos(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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