深入剖析Android中init进程实现的C语言源码

// 接收客户端请求数据

r = TEMP_FAILURE_RETRY(recv(s, &msg, sizeof(msg), 0)); if (r != sizeof(prop_msg)) {

ERROR("sys_prop: mis-match msg size received: %d expected : %d errno: %dn", r, sizeof(prop_msg), errno); close(s);

return; }

switch(msg.cmd) {

case PROP_MSG_SETPROP: msg.name[PROP_NAME_MAX - 1] = 0;

msg.value[PROP_VALUE_MAX - 1] = 0;

if (memcmp(msg.name, "ctl.", 4) == 0) { 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:%dn", msg.name + 4, msg.value, cr.uid, cr.gid, cr.pid);

} } else {

if (check_perms(msg.name, cr.uid, cr.gid, source_ctx)) { property_set((char *) msg.name, (char*) msg.value);

} close(s);

} break;

default: close(s);

break; }

}

当客户端的权限满足要求时，init就调用property_set进行相关处理。property_set源码实现如下：

int property_set(const char *name, const char *value) {
11/14 首页上一页 9 10 11 12 13 14 下一页尾页