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00001 #ifndef mux_MODULE 00002 #define mux_MODULE 00003 00004 /* 00005 * Copyright (c) 1989 by the Massachusetts Institute of Technology. 00006 * For copying and distribution information, see the file 00007 * "mit-copyright.h". 00008 * 00009 * Modified for jwgc by Daniel Henninger. 00010 */ 00011 00012 #include "mit-copyright.h" 00013 00014 /* 00015 * MAX_SOURCES - the greatest file descriptor # that can be waited on minus one 00016 * This can not exceed FD_SETSIZE from <sys/types.h>. 00017 */ 00018 00019 #define MAX_SOURCES 32 00020 00021 /* 00022 * mux_end_loop_p - Setting this to true during a mux_loop causes the mux_loop 00023 * to be exited. 00024 */ 00025 00026 extern int mux_end_loop_p; 00027 00028 /* 00029 * void mux_init() 00030 * Requires: mux_init has never been called before 00031 * Effects: Initializes the mux module. Must be called before 00032 * any other mux call. 00033 */ 00034 00035 extern void mux_init(); 00036 00037 /* 00038 * void mux_add_input_source(int descriptior; void (*handler)(); void *arg) 00039 * Requires: 0<=descriptor<MAX_SOURCES, mux_init has been called 00040 * Modifies: Removes the previous input handler if any for descriptor 00041 * Effects: Registers handler as the input handler for file descriptor 00042 * descriptor. When mux_loop() is running and input is 00043 * available on descriptor, handler will be called with 00044 * argument arg. 00045 */ 00046 00047 extern void mux_add_input_source(); 00048 extern void mux_delete_input_source(); 00049 00050 /* 00051 * void mux_loop() 00052 * Requires: mux_init has been called. 00053 * Effects: Loops until mux_end_loop_p becomes true. (Sets 00054 * mux_end_loop_p false to start). Whenever input is 00055 * available on an input source which has a registered 00056 * handler (see mux_add_input_source), that handler is 00057 * called with its argument. It is guarenteed that if 00058 * input is available on a source, its respective input 00059 * handler, if any, will eventually be called. No other 00060 * ordering guarentees are made. When some signal handler 00061 * or input handler eventually sets mux_end_loop_p to 00062 * true, we return. 00063 */ 00064 00065 extern void mux_loop(); 00066 00067 #endif
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