Can anyone describe to me what is happening in the code below. I am having trouble understanding the signal examples online. The exit_handlr function is returning a 0 for success and 1 for process that terminated abnormally. Thanks.
Code:97 signal(SIGHUP,exit_hndlr); 98 signal(SIGINT,exit_hndlr); 99 signal(SIGQUIT,exit_hndlr); 100 signal(SIGTERM,exit_hndlr);
This code sets up a signal handler for HUP, INT, QUIT, and TERM -- in other words, all the various signals normally used to terminate a program. Normally, these signals would immediately terminate the program. But with a handler installed, these signals will instead cause the function exit_handlr() to be executed. It's up to exit_handlr() to decide what to do.
Also, I doubt that the exit_handlr() is returning anything. If it is, it's meaningless, since nothing will ever see that return code.
You guys are life savers! Thank you very much for taking time to explain this for me. You are correct about exit_hndlr - it is a void function. Sorry about that.
-Carl
