English 中文(简体)
如何确保只运行一份应用程序副本? [重复]
原标题:How to ensure only one copy of the application is running? [duplicate]
  • 时间:2012-05-25 07:29:21
  •  标签:
  • c
  • linux
This question already has answers here:
Closed 11 years ago.

Possible Duplicate:
Preventing multiple process instances on Linux

我有多轨应用程序, 可以作为 deamon 进程运行, 或者一次输入参数 。

我想确保如果应用程序是作为执行程序运行的, 那么, 用户就不应该被允许再次运行此程序 。

EDIT:在你们都建议去取羊群之后, 我尝试过然后把它放到服务器上。 我知道有奇怪的问题, 当服务器被反弹时, 他们删除了所有的文件, 包括锁定文件 : (。 现在如何? )

最佳回答

最简单的方式是绑定到一个端口( 可能是 unix 域, 在“ 私有” 目录中) < 坚固 > 。 只有一个进程可以绑定到端口 < / 坚固 >, 所以如果端口被绑定, 程序正在运行。 如果进程退出, 内核会自动关闭文件描述符。 它会花费您的进程一个( 未使用的?) 上下文描述符。 一般来说, 守护进程需要一些倾听套接字 。

问题回答

您可以尝试使用 < a href=" "http://linux.die.net/man/2/flock" rel=“ nofollow” >file locks 。 进程启动后, 您可以打开文件, 锁定它, 检查一个值( 例如文件的大小) 。 如果它不是理想值, 进程可以退出。 如果需要, 请将文件更改为不理想值 。

使用 shell 脚本来启动和阻止守护进程,

在 exe 调用前的脚本中, 检查是否此 exe 仍在运行。 如果发现它仍在运行, 则没有启动新进程 。





相关问题
Fastest method for running a binary search on a file in C?

For example, let s say I want to find a particular word or number in a file. The contents are in sorted order (obviously). Since I want to run a binary search on the file, it seems like a real waste ...

Print possible strings created from a Number

Given a 10 digit Telephone Number, we have to print all possible strings created from that. The mapping of the numbers is the one as exactly on a phone s keypad. i.e. for 1,0-> No Letter for 2->...

Tips for debugging a made-for-linux application on windows?

I m trying to find the source of a bug I have found in an open-source application. I have managed to get a build up and running on my Windows machine, but I m having trouble finding the spot in the ...

Trying to split by two delimiters and it doesn t work - C

I wrote below code to readin line by line from stdin ex. city=Boston;city=New York;city=Chicago and then split each line by ; delimiter and print each record. Then in yet another loop I try to ...

Good, free, easy-to-use C graphics libraries? [closed]

I was wondering if there were any good free graphics libraries for C that are easy to use? It s for plotting 2d and 3d graphs and then saving to a file. It s on a Linux system and there s no gnuplot ...

Encoding, decoding an integer to a char array

Please note that this is not homework and i did search before starting this new thread. I got Store an int in a char array? I was looking for an answer but didn t get any satisfactory answer in the ...

热门标签