service的启动控制

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init.rc中声明某个服务：

service sample_service /system/bin/sample_service
disabled
oneshot

启动这个服务：

property_set("ctl.start","sample_service");

结束这个服务：

property_set("ctl.stop","sample_service");

看了源码，还可以重启它。

property_set("ctl.restart","sample_service");

相关源码：

property_service.c

void handle_property_set_fd(){        if(memcmp(msg.name,"ctl.",4) == 0) {            // Keep the old close-socket-early behavior when handling            // ctl.* properties.            close(s);            if (check_control_perms(msg.value, cr.uid, cr.gid, source_ctx)) {                handle_control_message((char*) msg.name + 4, (char*) msg.value);            } else {                ERROR("sys_prop: Unable to %s service ctl [%s] uid:%d gid:%d pid:%d\n",                        msg.name + 4, msg.value, cr.uid, cr.gid, cr.pid);            }        } }

init.c

void handle_control_message(const char *msg, const char *arg){    if (!strcmp(msg,"start")) {        msg_start(arg);    } else if (!strcmp(msg,"stop")) {        msg_stop(arg);    } else if (!strcmp(msg,"restart")) {    //重启        msg_stop(arg);        msg_start(arg);    } else {        ERROR("unknown control msg '%s'\n", msg);    }}

有些服务，需要参数，怎么传？找不到相关的资料，看代码：

static void msg_start(const char *name){    struct service *svc;    char *tmp = NULL;    char *args = NULL;    if (!strchr(name, ':'))        svc = service_find_by_name(name);    else {        tmp = strdup(name);        args = strchr(tmp, ':');        *args = '\0';        args++;        svc = service_find_by_name(tmp);    }    if (svc) {        service_start(svc, args);    } else {        ERROR("no such service '%s'\n", name);    }    if (tmp)        free(tmp);}

看来在“:”后面加参数就可以了。例如：

property_set("ctl.start","sample_service:arg0");

如果要加入多个参数，不知道是否和命令行中一样，用空格分隔即可。实测：

//sample_service.cint main(int argc,char *argv[]){char *arg0, *arg1;if(argc < 3){printf("param num: %d\n", argc);return 1;}arg0 = *++argv;arg1= *++argv;printf("arg0=%s, arg1=%s\n", arg0, arg1);}

调用：

property_set("ctl.start","sample_service:hello world");

输出结果：

hello, world

测试成功

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