I'm making my shell in c. and I want to make below

1)user enter control-c. my shell doesn't close. but if I enter "sleep 30" then my shell make child process and execlp. then if I enter control-c, child process get signal and child process killled. but my shell still work.

2)user enter control-d. my shell is finshed anytime if child process exist or not.

I know I need signal(SIGINT, SIG_IGN) to ignore control-c. but I don't know how can I send signal to child process and kill only child process.

Please give me specific function and examination.