ser2net 源码分析, 将TCP数据转发到serial

--- ser2net 源码分析: 将TCP数据转发到serial

static char *config_file = "/etc/ser2net.conf";
--- readconfig.c: 用fgets读取配置文件的内容并进行解析(handle_config_line)
--- selector.c: 利用回调函数
typedef void (*t_sighup_handler)(void);
static t_sighup_handler user_sighup_handler = NULL;
/* The main loop for the program.  This will select on the various sets, then scan for any available I/O to process.
It also monitors the time and call the timeout handlers periodically. 被调用端传递数据, 循环判断有无数据*/
void sel_select_loop(selector_t *sel)
{
    for (;;) {
        memcpy(&tmp_read_set, &sel->read_set, sizeof(tmp_read_set));
        memcpy(&tmp_write_set, &sel->write_set, sizeof(tmp_write_set));
        memcpy(&tmp_except_set, &sel->except_set, sizeof(tmp_except_set));
        err = select(sel->maxfd+1, &tmp_read_set, &tmp_write_set, &tmp_except_set, to_time);
        if (err == 0) {
            /* A timeout occurred. */
        } else if (err < 0) {
            /* An error occurred. */
        } else {
            /* We got some I/O. */
        for (i=0; i<=sel->maxfd; i++) {
                if (FD_ISSET(i, &tmp_read_set)) {
                    if (sel->fds[i].handle_read == NULL) {
                            /* Somehow we don't have a handler for this. Just shut it down. */
                            sel_set_fd_read_handler(sel, i, SEL_FD_HANDLER_DISABLED);
                    } else {
                            sel->fds[i].handle_read(i, sel->fds[i].data);
                    }
                }
                if (FD_ISSET(i, &tmp_write_set)) {
                    if (sel->fds[i].handle_write == NULL) {
                            /* Somehow we don't have a handler for this. Just shut it down. */
                            sel_set_fd_write_handler(sel, i, SEL_FD_HANDLER_DISABLED);
                    } else {
                            sel->fds[i].handle_write(i, sel->fds[i].data);
                    }
                }
                if (FD_ISSET(i, &tmp_except_set)) {
                    if (sel->fds[i].handle_except == NULL) {
                            /* Somehow we don't have a handler for this. Just shut it down. */
                            sel_set_fd_except_handler(sel, i, SEL_FD_HANDLER_DISABLED);
                    } else {
                            sel->fds[i].handle_except(i, sel->fds[i].data);
                    }
                }
        }
        }

        if (got_sighup) {
            got_sighup = 0;
            if (user_sighup_handler != NULL) {
                    user_sighup_handler();
            }
        }
    }    //for (;;)
}

//设置原型
void set_sighup_handler(t_sighup_handler handler)
{
    user_sighup_handler = handler;
}

//调用端处理数据
void reread_config(void)    {}
set_sighup_handler(reread_config);
sel_select_loop(ser2net_sel);

--- dataxfer.c == 串口部分的操作

//--- openwrt中的ipk应用

opkg install /tmp/ser2net_2.7-2_brcm63xx.ipk

看到安装成功的信息后启动ser2net

Ser2net –c /etc/ser2net.conf

设置随机启动

命令vi /etc/rc.local 打开它，i进入编辑，在exit0的上一行添加一条ser2net，esc退出编辑，wq保存

命令vi /etc/init.d/ser2net，，i进入编辑

#!/bin/sh /etc/rc.common

# /init.d/my-ser2net

START=99

start() {

Ser2net –c /etc/ser2net.conf

}

Esc退出编辑，wq 保存。

命令reboot重启路由器，ok

vi /etc/init.d/ser2net，，a进入编辑

#!/bin/sh /etc/rc.common

# /init.d/my-plugin

START=99

start() {

  ser2net

  }

Esc退出编辑，ZZ 保存。