NAME    [Toc]    [Back]

     fd, stdin, stdout, stderr -- file descriptor files

DESCRIPTION    [Toc]    [Back]

     The files /dev/fd/0 through /dev/fd/# refer to file descriptors which can
     be accessed through the file system.  If the file descriptor is open and
     the mode the file is being opened with is a subset of the mode of the
     existing descriptor, the call:

	   fd = open("/dev/fd/0", mode);

     and the call:

	   fd = fcntl(0, F_DUPFD, 0);

     are equivalent.

     Opening the files /dev/stdin, /dev/stdout and /dev/stderr is equivalent
     to the following calls:

	   fd = fcntl(STDIN_FILENO,  F_DUPFD, 0);
	   fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
	   fd = fcntl(STDERR_FILENO, F_DUPFD, 0);

     Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are
     ignored.

FILES    [Toc]    [Back]

     /dev/fd/#
     /dev/stdin
     /dev/stdout
     /dev/stderr

SEE ALSO    [Toc]    [Back]

     tty(4)


FreeBSD 5.2.1			 June 9, 1993			 FreeBSD 5.2.1