Signal Handling--ref

int
main (void)
{
signal (SIGCONT,tstp_handler);
...
}

raisewas invented by the ANSI C committee. Older systems may not support it,so usingkillmay be more portable. See section.

killfunction can be used to send a signal to another process. In spite of its name,it can be used for a lot of things other than causing a process to terminate. Some examples of situations where you might want to send signals between processes are:

A parent process starts a child to perform a task--perhaps having the child running an infinite loop--and then terminates the child when the task is no longer needed.
• A process executes as part of a group,and needs to terminate or notify the other processes in the group when an error or other event occurs.
• Two processes need to synchronize while working together.

killfunction is declared in`signal.h'.

intkill(pid_tpid,intsignum)

Thekillfunction sends the signalsignumto the process or process group specified bypid. Besides the signals listed in section,signumcan also have a value of zero to check the validity of thepid.

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