What is the system call available to transmit a signal?

System call Kill is used to send a signal to a method or a group of processes.

Int kill (pad tepid, Int sig);

This returns -1 on error and 0on no error

Sig- signal t be sent

Pad - identity of the receiving entity

If pad=positive, the signal sig is sent to the process identified by pid

If pad=NULL, the signal sig is sent to the sender group of the sender

If pad=-1 the signal sig is sent to all process except the first

If pad<-1 the signal sig is sent to a group of process identified by pad

To sent a signal to group of processes, there is also the call kelp

intkillpg(intpgrp, Int sig)

This returns null when it's sent to the group

Parp- simonizes the group the signal is sent to.

To sent signal to itself

int raise(int sig);- in the event of error it sends a non zero value