问题
Is there any way to get all opened sockets using c++? I know the lsof command and this is what I'm looking for, but how to use it in a c++ application?
The idea is to get the FD of an opened socket by its port number and the pid.
回答1:
Just open the files in /proc/net, like /proc/net/tcp, /proc/net/udp, etc. No need to slog through the lsof sources. :)
回答2:
If you don't want to copy/paste or reimplement chunks of the lsof code, and it doesn't build any useful libraries you could leverage, you can still open a pipe to an lsof process and peruse its output.
回答3:
check the lsof source?
ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
回答4:
The lsof command is prepared specifically such that it can be used from other programs including C, see the section: OUTPUT FOR OTHER PROGRAMS of man lsof for more information. For example you can invoke lsof with -F p and it will output the pid of the processes prefixed with 'p':
$ lsof -F p /some/file
p1234
p4321
you can then use popen to execute this commmand in a child process and read from its standard output.
来源：https://stackoverflow.com/questions/4470121/how-to-use-lsoflist-opened-files-in-a-c-c-application