fd(4)									 fd(4)

NAME    [Toc]    [Back]

     /dev/fd - file descriptor files

DESCRIPTION    [Toc]    [Back]

     These files, conventionally called	/dev/fd/0, /dev/fd/1, /dev/fd/2, and
     so	on, refer to files accessible through file descriptors.	 If file
     descriptor	n is open, these two system calls have the same	effect:

	  fd = open("/dev/fd/n<b>",mode);
	  fd = dup(n<b>);

     On	these files creat(2) is	equivalent to open, and	mode is	ignored.  As
     with dup, subsequent reads	or writes on fd	fail unless the	original file
     descriptor	allows the operations.

SEE ALSO    [Toc]    [Back]

     open(2), dup(2)

DIAGNOSTICS    [Toc]    [Back]

     open(2) returns -1	and EBADF if the associated file descriptor is not
     open.


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