linux java串口读写权限_解决linux下java读取串口之权限问题 No permission to create lock file. ...

在终端或IDE中运行java读取串口程序时，总是报告如下信息：

[lhwtouch@localhost root]$ java Main

Experimental: JNI_OnLoad called.

Stable Library

=========================================

Native lib Version = RXTX-2.1-7

Java lib Version = RXTX-2.1-7

check_group_uucp(): error testing lock file creation Error details:Permission deniedcheck_lock_status:

No permission to create lock file.

please see: How can I use Lock Files with rxtx? in INSTALL

根据此提示，找到下载的RXTX包中的INSTALL文件后，用UE打开，发现如下信息【部分】：

Linux (only x86, x86_64, ia64 here but more in the ToyBox)

RXTXcomm.jar goes in /jre/lib/ext (under java)

librxtxSerial.so goes in /jre/lib/[machine type] (i386 for instance)

Make sure the user is in group lock or uucp so lockfiles work.

A person is added to group lock or uucp by editing /etc/groups. Distributions

have various tools but this works:

lock:x:54: becomes:

lock:x:53:jarvi,taj

Now jarvi and taj are in group lock.

Also make sure jarvi and taj have read and write permissions on the port.

解决步骤为：

1：查找/etc下的groups文件，但是没有找到。只有group、group- 这2个文件，其中group文件就是我们要找的。

打开此文件，将如下2段修改：

uucp:x:14:uucp         修改为  uucp:x:14:uucp,lhwtouch

lock:x:54:                  修改为  lock:x:54:lhwtouch

修改这个文件后，必须重启系统，才能使之起效！

备注：

1、本人所用系统为中标普华linux2.6

2、修改group文件中的lhwtouch为系统的普通用户。

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