4.4BSD/usr/share/man/cat4/stderr.0

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FD(4)                       BSD Programmer's Manual                      FD(4)

NNAAMMEE
     ffdd, ssttddiinn, ssttddoouutt, ssttddeerrrr - file descriptor files

DDEESSCCRRIIPPTTIIOONN
     The files _/_d_e_v_/_f_d_/_0 through _/_d_e_v_/_f_d_/_# 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 _/_d_e_v_/_s_t_d_i_n, _/_d_e_v_/_s_t_d_o_u_t and _/_d_e_v_/_s_t_d_e_r_r 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.

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

SSEEEE AALLSSOO
     tty(4)

4.4BSD                           June 9, 1993                                1