节点的意思，就是硬盘设备是接到对应哪种接口的那个ID上。

老的SCSI设备默认有7个id，拓展版本有15个id，默认SCSI控制卡占用id7，其他的都可以挂硬盘。

SCSI 0：0，表示第一通道的第一个id，或者说是第一通道的第一个SCSI设备。

老的PATA并行IDE接口，也是一样，一条线上分master主设备和slaver从设备两个端口。

IDE 0:0 ,表示第一个IDE通道的主设备.

无线网络设备节点是什么

Android如何生成设备节点在Android中，由于没有mdev和udev，所以它没有办法动态的生成设备节点，那么它是如何做的呢？我们可以在system/core/init/下的init.c和devices.c中找到答案：init.c中int main(int argc, char **argv) { ... mkdir("/dev", 0755)mkdir("/proc", 0755)mkdir("/sys", 0755)mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755")mkdir("/dev/pts", 0755)mkdir("/dev/socket", 0755)mount("devpts", "/dev/pts", "devpts", 0, NULL)mount("proc", "/proc", "proc", 0, NULL)mount("sysfs", "/sys", "sysfs", 0, NULL)for() { ... if (ufds[0].revents == POLLIN) handle_device_fd(device_fd)if (ufds[1].revents == POLLIN) handle_property_set_fd(property_set_fd)if (ufds[3].revents == POLLIN) handle_keychord(keychord_fd)} return 0} 我们再来看看handle_device_fd()，该函数定义在devices.c中void handle_device_fd(int fd) { ... handle_device_event(&uevent)handle_firmware_event(&uevent)} } 而handle_device_event定义如下：static void handle_device_event(struct uevent *uevent) { ... if(!strcmp(uevent->action, "add")) { make_device(devpath, block, uevent->major, uevent->minor)return} ... } make_device定义如下：static void make_device(const char *path, int block, int major, int minor) { ... mode = get_device_perm(path, &uid, &gid) (block S_IFBLK : S_IFCHR)dev = (major $amp... setegid(gid)mknod(path, mode, dev)chown(path, uid, -1)setegid(AID_ROOT)} 我们看看get_device_perm如下实现：static mode_t get_device_perm(const char *path, unsigned *uid, unsigned *gid) { mode_t permif (get_device_perm_inner(qemu_perms, path, uid, gid, &perm) == 0) { return perm} else if (get_device_perm_inner(devperms, path, uid, gid, &perm) == 0) { return perm} else { struct listnode *nodestruct perm_node *perm_nodestruct perms_ *dp list_for_each(node, &devperms_partners) { perm_node = node_to_item(node, struct perm_node, plist)dp = &perm_node->dpif (dp->prefix) { if (strncmp(path, dp->name, strlen(dp->name))) continue} else { if (strcmp(path, dp->name)) continue} *uid = dp->uid*gid = dp->gidreturn dp->perm} *uid = 0*gid = 0return 0600} } 我们最后可以看到在devperms中定义了要生成的设备节点：static struct perms_ devperms[] = { { "/dev/null", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/zero", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/full", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/ptmx", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/tty", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/random", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/urandom", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/ashmem", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/binder", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/log/", 0662, AID_ROOT, AID_LOG, 1 }, { "/dev/msm_hw3dc", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/kgsl", 0666, AID_ROOT, AID_ROOT, 0 }, { "/dev/diag", 0660, AID_RADIO, AID_RADIO, 0 }, { "/dev/diag_arm9", 0660, AID_RADIO, AID_RADIO, 0 }, { "/dev/android_adb", 0660, AID_ADB, AID_ADB, 0 }, { "/dev/android_adb_enable", 0660, AID_ADB, AID_ADB, 0 }, { "/dev/ttyMSM0", 0600, AID_BLUETOOTH, AID_BLUETOOTH, 0 }, { "/dev/ttyHS0", 0600, AID_BLUETOOTH, AID_BLUETOOTH, 0 }, { "/dev/uinput", 0660, AID_SYSTEM, AID_BLUETOOTH, 0 }, { "/dev/alarm", 0664, AID_SYSTEM, AID_RADIO, 0 }, { "/dev/tty0", 0660, AID_ROOT, AID_SYSTEM, 0 }, { "/dev/graphics/", 0660, AID_ROOT, AID_GRAPHICS, 1 }, { "/dev/msm_hw3dm", 0660, AID_SYSTEM, AID_GRAPHICS, 0 }, { "/dev/input/", 0660, AID_ROOT, AID_INPUT, 1 }, { "/dev/eac", 0660, AID_ROOT, AID_AUDIO, 0 }, { "/dev/cam", 0660, AID_ROOT, AID_CAMERA, 0 }, { "/dev/pmem", 0660, AID_SYSTEM, AID_GRAPHICS, 0 }, { "/dev/pmem_adsp", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/pmem_camera", 0660, AID_SYSTEM, AID_CAMERA, 1 }, { "/dev/oncrpc/", 0660, AID_ROOT, AID_SYSTEM, 1 }, { "/dev/adsp/", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/snd/", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/mt9t013", 0660, AID_SYSTEM, AID_SYSTEM, 0 }, { "/dev/msm_camera/", 0660, AID_SYSTEM, AID_SYSTEM, 1 }, { "/dev/akm8976_daemon",0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/akm8976_aot", 0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/akm8973_daemon",0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/akm8973_aot", 0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/bma150", 0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/cm3602", 0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/akm8976_pffd", 0640, AID_COMPASS, AID_SYSTEM, 0 }, { "/dev/lightsensor", 0640, AID_SYSTEM, AID_SYSTEM, 0 }, { "/dev/msm_pcm_out", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/msm_pcm_in", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/msm_pcm_ctl", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/msm_snd", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/msm_mp3", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/audience_a1026", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/tpa2018d1", 0660, AID_SYSTEM, AID_AUDIO, 1 }, { "/dev/msm_audpre", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/msm_audio_ctl", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/htc-acoustic", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/vdec", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/q6venc", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/snd/dsp", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/snd/dsp1", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/snd/mixer", 0660, AID_SYSTEM, AID_AUDIO, 0 }, { "/dev/smd0", 0640, AID_RADIO, AID_RADIO, 0 }, { "/dev/qemu_trace", 0666, AID_SYSTEM, AID_SYSTEM, 0 }, { "/dev/qmi", 0640, AID_RADIO, AID_RADIO, 0 }, { "/dev/qmi0", 0640, AID_RADIO, AID_RADIO, 0 }, { "/dev/qmi1", 0640, AID_RADIO, AID_RADIO, 0 }, { "/dev/qmi2", 0640, AID_RADIO, AID_RADIO, 0 }, { "/dev/ts0710mux", 0640, AID_RADIO, AID_RADIO, 1 }, { "/dev/ppp", 0660, AID_RADIO, AID_VPN, 0 }, { "/dev/tun", 0640, AID_VPN, AID_VPN, 0 }, { NULL, 0, 0, 0, 0 }, }

网络节点是指一台电脑或其他设备与一个有独立地址和具有传送或接收数据功能的网络相连。节点可以是工作站、客户、网络用户或个人计算机，还可以是服务器、打印机和其他网络连接的设备。每一个工作站﹑服务器、终端设备、网络设备，即拥有自己唯一网络地址的设备都是网络节点。整个网络就是由这许许多多的网络节点组成的，把许多的网络节点用通信线路连接起来，形成一定的几何关系，这就是计算机网络拓扑。

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