@node fdopen, stdio
@subheading Syntax

@example
#include <stdio.h>

FILE *fdopen(int fd, const char *mode);
@end example

@subheading Description

This function opens a stream-type file that uses the given @var{fd}
file, which must already be open.  The file is opened with the modes
specified by @var{mode}, which is the same as for @code{fopen}. 
@xref{fopen}.

@subheading Return Value

The newly created @code{FILE *}, or @code{NULL} on error.

@subheading Portability

@portability !ansi, posix

@subheading Example

@example
FILE *stdprn = fdopen(4, "w");
@end example