Originální popis anglicky:
fileno - map a stream pointer to a file descriptor
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
int fileno(FILE *
stream);
The
fileno() function shall return the integer file descriptor associated
with the stream pointed to by
stream.
Upon successful completion,
fileno() shall return the integer value of
the file descriptor associated with
stream. Otherwise, the value -1
shall be returned and
errno set to indicate the error.
The
fileno() function may fail if:
- EBADF
- The stream argument is not a valid stream.
The following sections are informative.
None.
None.
Without some specification of which file descriptors are associated with these
streams, it is impossible for an application to set up the streams for another
application it starts with
fork() and
exec. In particular, it
would not be possible to write a portable version of the
sh command
interpreter (although there may be other constraints that would prevent that
portability).
None.
Interaction of File Descriptors and Standard I/O Streams ,
fdopen() ,
fopen() ,
stdin() , the Base Definitions
volume of IEEE Std 1003.1-2001,
<stdio.h>
Portions 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
.
