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-.TH STREAM 4
-.CT 2 comm_proc
-.SH NAME
-stream \- I/O control for streams
-.SH SYNOPSIS
-.B #include <sys/filio.h>
-.br
-.B #include <sys/ttyio.h>
-.PP
-.B ioctl(fd, code, param)
-.br
-.B void *param;
-.SH DESCRIPTION
-A stream is a connection between two processes, or between a process
-and a device.
-It is referred to by a file descriptor, and ordinary read and write
-calls apply.
-When a
-.IR write (2)
-call is given on a stream whose other end has disappeared,
-for example because the process at other end of a pipe has terminated,
-or a device has hung up, signal 
-.B SIGPIPE
-is generated; if the signal is ignored,
-the write call returns error
-.BR EPIPE .
-The first several (currently 64)
-.IR read (2)
-calls on such a disconnected streams
-return 0;
-subsequent calls generate
-.B SIGPIPE
-signals.
-.PP
-Processing modules may be inserted into streams.
-These
-.IR ioctl (2)
-calls insert, delete, inspect, and perform operations for stream
-I/O modules.
-They apply to the file descriptor of any open stream object:
-terminal, network connection, pipe.
-The
-.I param
-argument is a general pointer which, for these calls, is often
-null, a pointer to
-.BR int .
-The codes are
-.TF FIOPUSHLD
-.TP
-.B FIOPUSHLD
-Insert, at the near end of the stream, the line discipline named by
-the integer to which
-.I param
-points.
-A census of line discipline modules is given below.
-.PD
-.TP
-.B FIOINSLD
-Insert a named line discipline at a given level in a stack
-of such modules on the stream.
-.I Param
-points to a structure containing two short integers
-respectively naming the line discipline and the level.
-A level of 0 could be accomplished by
-.BR FIOPUSHLD .
-.TP
-.B FIOPOPLD
-Pop (removes) the nearest line discipline module, if
-.I param
-is 0 (null).
-If
-.I param
-points to an integer, the line discipline at that level is removed.
-The integer 0 is the same as a null
-.IR param .
-.TP
-.B FIOLOOKLD
-Return the number of the topmost line discipline in the stack.
-If
-.I param
-is not 0 but instead points to an integer, the line discipline at that
-level is returned in the same integer.
-.TP
-.B FIOSNDFD
-Send the integer file descriptor pointed to by
-.IR param
-to the process on the other end of pipe
-.IR fd .
-The code is transmitted directly to the other end of
-the pipe, untransformed by line disciplines.
-It cannot be forged by the message line discipline,
-.IR mesgld (4).
-The call returns immediately; it does not rendezvous with
-the matching
-.BR FIORCVFD .
-.TP
-.B FIORCVFD
-Deliver a structure pointed to by
-.IR param :
-.EX
-struct passfd {
-	int	fd;
-	short	uid;
-	short	gid;
-	short	nice;
-	char	logname[8];
-	char	cap;
-};
-.EE
-.IP
-The call blocks until there is something in the stream.
-If data is present, it returns
-.BR EIO .
-If a file descriptor has been sent from the other
-end of the pipe by
-.BR FIOSNDFD ,
-.B FIORCVFD
-fills in the user and group ID of the sending process,
-its niceness (see
-.IR nice (2)),
-its login name, its capabilities in the form of the field
-.B lb_t
-(see
-.IR getflab (2)),
-and a file descriptor for the file
-being sent; the file is now open in the receiving process.
-Another use of
-.B FIORCVFD
-is described in
-.IR connld (4).
-.TP
-.B FIONREAD
-Store, in the integer pointed to by
-.IR param ,
-the number of characters that may be read from this stream
-without possible blocking.
-.TP
-.B FIOGSRC
-Copy the stream identifier to the
-.BR SSRCSIZ -byte
-string pointed to by
-.IR param.
-.TP
-.B FIOSSRC
-Copy the
-.BR SSRCSIZ -byte
-string pointed to by
-.I param
-into the stream identifier.
-Capability
-.B T_EXTERN
-is required; see
-.IR getplab (2).
-Empty by default, the stream identifier is customarily
-set on network connections to identify the source.
-Successful password demands may also be recorded
-in the stream identifier for the benefit of
-.IR pwserv (8);
-see
-.IR session (1).
-.TP
-.B TIOCSPGRP
-Make this process the head of a process group and makes this stream
-its control stream.
-When signals, such as hangup, interrupt, and quit, arrive at
-a control stream, they are sent to its process group.
-Child processes inherit the process group of their parent.
-Process groups are created only by explicit use of this call,
-and not implicitly by opening certain devices.
-.I Param
-must be 0.
-.TP
-.B TIOCGPGRP
-Store through
-.I param
-a
-.B short
-naming the process group associated with the stream.
-.TP
-.B TIOCEXCL
-Mark this stream as inaccessible except by the super-user
-or by processes in the group associated with this stream.
-.TP
-.B TIOCNXCL
-Remove the inaccessibility of the stream.
-.TP
-.B TIOCSBRK
-Generate a message requesting
-a line break.
-The message is understood by devices capable of generating it
-(such as asynchronous character devices) and ignored otherwise.
-.TP
-.B TIOCFLUSH
-Generate a message causing downstream modules to throw away any
-queued characters, if possible.
-It applies to both input and output queues.
-If the stream serves a device, the flush message may
-cause further action in the device driver.
-.TP
-.B TIOCXFLUSH
-Delete all data and messages from input and output queues.
-No flush message is passed down the stream or to a
-device driver.
-.LP
-Here is a list of available line discipline modules.
-Each is an external integer, defined in 
-.IR libc ;
-see
-.IR intro (3).
-.TF rmesg_ld
-.TP
-.B tty_ld
-Regular terminal processing; see
-.IR ttyld (4).
-.TP
-.B ntty_ld
-Terminal processing according to (modified) Berkeley `new tty' rules;
-see Berkeley Users Manual.
-.TP
-.B cdkp_ld
-Character-mode Datakit universal receiver protocol.
-.TP
-.B dkp_ld
-Block-mode Datakit universal receiver protocol.
-.TP
-.B rdk_ld
-.TP
-.B uxp_ld
-Special Datakit protocols used in connection setup.
-.TP
-.B buf_ld
-Buffering mechanism;
-see
-.IR bufld (4).
-.TP
-.B mesg_ld
-turns stream control blocks arriving in the read direction into
-data messages, and written messages into controls.
-See
-.IR mesgld (4).
-.TP 
-.B rmesg_ld
-inverse of
-.BR mesg_ld .
-.TP
-.B conn_ld
-For making unique connections to servers.
-See
-.IR connld (4).
-.TP
-.B ip_ld
-.TP
-.B tcp_ld
-.TP
-.B udp_ld
-.TP
-.B arp_ld
-Internet protocols;
-see
-.IR internet (3).
-.SH SEE ALSO
-.IR ioctl (2),
-.IR getstsrc (3)
-.br
-D. M. Ritchie,
-`A Stream I/O System'
-.I BLTJ,
-October, 1984
-.br
-.I
-UNIX Programmer's Manual, Seventh Edition, Virtual VAX-11 Version,
-1980 (Berkeley)