QNX 字符设备 resource manager 实例

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前言

本文主要介绍如何编写一个 qnx 下 的 char device resource managers （字符设备驱动）
软件环境：qnx7.1

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一、普通的 resource managers

如下代码是 qnx 官网的 resource managers 实例， 会生成一个 /dev/sample 节点

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

static resmgr_connect_funcs_t    connect_funcs;
static resmgr_io_funcs_t         io_funcs;
static iofunc_attr_t             attr;

int main(int argc, char **argv)
{
   
    /* declare variables we'll be using */
    resmgr_attr_t        resmgr_attr;
    dispatch_t           *dpp;
    dispatch_context_t   *ctp;
    int                  id;

    /* initialize dispatch interface */
    dpp = dispatch_create_channel(-1, DISPATCH_FLAG_NOLOCK );
    if (dpp == NULL) {
   
        fprintf(stderr,
                "%s: Unable to allocate dispatch handle.\n",
                argv[0]);
        return EXIT_FAILURE;<