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FD(4)                    BSD Kernel Interfaces Manual                    FD(4)

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

DESCRIPTION
     The files /dev/fd/_ 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
     /dev/fd/#
     /dev/stdin
     /dev/stdout
     /dev/stderr

SEE ALSO
     tty(4)

BSD                              June 9, 1993                              BSD