FD(4) MachTen Programmer’s Manual FD(4)

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

DESCRIPTION
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 ex-
isting 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
/dev/fd/#
/dev/stdin
/dev/stdout
/dev/stderr

SEE ALSO
tty(4)

4.4BSD June 9, 1993 1