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Annotation of coherent/a/usr/include.b4ps2/poll.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 3.0
                      3:  *     Copyright (c) 1982, 1990 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: #ifndef        POLL_H
                      7: #define        POLL_H
                      8: /*
                      9:  * This is a temporary file, and will NOT be binary compatible with System V.
                     10:  */
                     11: 
                     12: /*
                     13:  * Polling structure.
                     14:  */
                     15: struct pollfd {
                     16:        int     fd;             /* file descriptor      */
                     17:        short   events;         /* requested events     */
                     18:        short   revents;        /* returned events      */
                     19: };
                     20: 
                     21: /*
                     22:  * Stream oriented events.
                     23:  */
                     24: #define        POLLIN   000001         /* input data is available              */
                     25: #define        POLLPRI  000002         /* priority message is available        */
                     26: #define        POLLOUT  000004         /* output can be sent                   */
                     27: #define        POLLERR  000010         /* a fatal error has occurred           */
                     28: #define        POLLHUP  000020         /* a hangup condition exists            */
                     29: #define        POLLNVAL 000040         /* fd does not access an open stream    */
                     30: 
                     31: /*
                     32:  * Each pollable event in the system has an associated event queue.
                     33:  * An polled event will be
                     34:  *     on a singularly-linked list throuch cprocp->p_polls, and
                     35:  *     on a circularly-linked list through an event queue on the device.
                     36:  */
                     37: typedef
                     38: struct event {
                     39:        struct event *  e_pnext;        /* next polled event on proc    */
                     40:        struct event *  e_dnext;        /* next polled event on device  */
                     41:        struct event *  e_dlast;        /* prev polled event on device  */
                     42:        struct proc  *  e_procp;        /* pointer to polling process   */
                     43: } event_t;
                     44: 
                     45: #endif

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