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“issig” (3991) is called by “sleep” ( 2085), “trap” (2821) and “clock” (3826) to enquire whether there is an outstanding non-ignorable software interrupt for the active process just waiting to happen.
“psig” (4043) is called whenever “issig” returns a non-zero result (except in “sleep” where things are a little more complex) to implement the action triggered by the interrupt.
“core” (4094) is called by “psig” if a core dump is indicated for a terminating process.
“grow” (4136) is called by “psig” to enlarge the user mode stack area if necessary.
“exit” (3219) terminates the currently active process.
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