4.3BSD-Reno/share/man/cat4/fd.0

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FD(4)			      1990			    FD(4)



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

DDEESSCCRRIIPPTTIIOONN
     The files /_d_e_v/_f_d/_0 through /_d_e_v/_f_d/# refer to file descrip-
     tors 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 descrip-
     tor, 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 _o_p_e_n(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)



















Printed 7/27/90                May				1