/* $Id$ */ /* * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands. * See the copyright notice in the ACK home directory, in the file "Copyright". */ /* ocm_chan.h - channel definitions */ #include #include "ocm_parco.h" typedef union channel { struct { /* Interprocess channel */ char _type; /* Channel type, see note */ char synch; /* State in channel synchronization */ long val; /* Transmitted value */ } c; struct { /* File channel */ char _type; /* Dummy field, see note */ char index; /* Index in the file array */ char flgs; /* Status flags: in use & readahead */ char preread; /* Possible preread character */ } f; } chan; #define type c._type /* Channel type */ /* Note: The channel type should not be part of each structure in chan. But * the C alignment rules would make chan about 50% bigger if we had done it * the right way. Note that the order of fields in a struct cannot be a problem * as long as struct c is the largest within the union. */ #define C_T_CHAN 0 /* Type of a interprocess channel */ #define C_T_FILE 1 /* Type of a file channel */ #define C_S_FREE 0 /* IP channel is free */ #define C_S_ANY 1 /* IP channel contains data */ #define C_S_ACK 2 /* IP channel data is removed */ #define C_F_EOF (-1L) /* File channel returns EOF */ #define C_F_TEXT (-2L) /* File channel becomes line oriented */ #define C_F_RAW (-3L) /* File channel becomes character oriented */ #define C_F_INUSE 0x01 /* File channel is connected to a UNIX file */ #define C_F_READAHEAD 0x02 /* File channel has a preread character */ extern chan file[20]; /* Array of file channels */ extern FILE *unix_file[20]; /* Pointers to buffered UNIX files */ void c_init(); void chan_in(), cbyte_in(), c_wa_in(), c_ba_in(); void chan_out(), c_wa_out(), c_ba_out(); int chan_any();