如何在Linux中从pid获取进程的路径或名称

Question

I have implemented a sigaction(SIGTSTP, &act, NULL) signal handler from which I am able to get the pid of the process which is sending the signal. And with this pid I am trying to get the path of that process using the command

ls -l /proc/pid/exe

but it is showing message

ls: /proc/23710/exe: No such file or directory

Even I am executing the command "ps" the process is not listed. Can anybody tell me how to get the path or name of such process?

Answer 1

You can get the command line of the process from pid, you can read the /proc/<pid>/cmdline :

   /proc/[pid]/cmdline
          This read-only file holds the complete command line for the
          process, unless the process is a zombie.  In the latter case,
          there is nothing in this file: that is, a read on this file
          will return 0 characters.  The command-line arguments appear
          in this file as a set of strings separated by null bytes
          ('\0'), with a further null byte after the last string.

From that, you may get the path or name of the process.