Obtains the file descriptor associated with a stream.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <unix.h>

int fileno(FILE *stream);

Parameters for this facility are:

stream

FILE *

A pointer to a FILE stream

This function obtains the file descriptor for the stream. You can use the file descriptor with other functions in unix.h, such as read() and write().

For the standard I/O streams stdin, stdout, and stderr, fileno() returns the following values:

This function call	Returns this file descriptor
fileno(stdin)	0
fileno(stdout)	1
fileno(stderr)	2

If it is successful, fileno() returns a file descriptor. If it encounters an error, it returns -1 and sets errno.

"fdopen"

"open"

#include <unix.h>
#include <stdio.h>

int main(void)
{
	printf("The handle for the standard input device is: %d",
				 fileno(stdin) );

	return 0;
}
Reult
The handle for the standard input device is: 0





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Last updated: August 16, 2000