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“kill” (3630) implements system call #37 (kill) to cause a specified interrupt to a process defined by its process identifying number.
“signal” (3949) causes a specified interrupt to be caused for all processes controlled and/or initiated from a specified terminal.
“psignal” (3963) is called by “kill” (3649) and “signal” (3955) (also “trap” (2793, 2818) and “pipe” (7828)) to do the actual setting of “p_sig”.
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