osf1 man page for fileno

fileno(3)						     Library Functions Manual							 fileno(3)

NAME
       fileno - Maps a stream pointer to a file descriptor

LIBRARY
       Standard C Library (libc)

SYNOPSIS
       #include <stdio.h>

       int fileno(
	       FILE *stream);

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       fileno(): XSH5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS
       Specifies the input stream.

DESCRIPTION
       The fileno() function returns the integer file descriptor associated with the stream pointed to by stream.

NOTES
       [Tru64  UNIX]  The fileno() function may be a macro (depending on the compile-time definitions used in the source).  Consequently, you can-
       not use this interface where a function is necessary; for example, a subroutine pointer cannot point to the interface.

RETURN VALUES
       Upon successful completion, the fileno() macro returns the integer value of the file descriptor associated with the stream parameter.  Oth-
       erwise, the value -1 is returned.

RELATED INFORMATION
       Functions: open(2), clearerr(3), fdopen(3), feof(3), ferror(3), fopen(3)

       Standards: standards(5) delim off

																	 fileno(3)