What is the Signal function (SIGINT)?

c signals sigint
Amit Jain picture Amit Jain · Apr 30, 2013 · Viewed 17.8k times · Source

What does this statement below do? If anyone can explain this function I would really appreciate it.

signal(SIGINT, SIG_DFL);

Answer

Sandeep_black picture Sandeep_black · Mar 26, 2017

SIGINT is the interrupt signal (ctrl+C). Its default behaviour is to terminate the process. SIGINT signal can be dis-positioned, means one can change the default behaviour ( By calling sighandler, or setting it SIG_IGN ) Now once the action is changes and you want to set it again the default behaviour of this signal then you should write

signal(SIGINT, SIG_DFL);

It will again change the default behaviour of the signal. ( which is to terminate a process )

Related questions

How to prevent SIGPIPEs (or handle them properly)

I have a small server program that accepts connections on a TCP or local UNIX socket, reads a simple command and (depending on the command) sends a reply. The problem is that the client may have no interest in the …

Read More
Catch Ctrl-C in C

How does one catch Ctrl+C in C?

Read More
How to trigger SIGUSR1 and SIGUSR2?

I'm getting acquainted with signals in C. I can't figure out what kind of signals SIGUSR1 and SIGUSR2 are and how can I trigger them. Can anyone please explain it to me?

Read More