and the low 8 are the signal id. Is that correct?
No, the low 7 bits indicate the signal that ended the process. Bit 7 indicates whether a core dump was saved.

By my math, the 8th bit signals the core dump. I assume that's a typo.

In reply to Re^2: return value from system call, exit status, shift right 8, bitwise and, $? by 7stud
in thread return value from system call, exit status, shift right 8, bitwise and, $? by Anonymous Monk

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