The abort function in C is supposed to raise a SIGABRT signal. But what if the underlying platform does not support the SIGABRT signal or does not support signals at all, for example, when C is ported to some non-Posix-compliant OSes. In this case, what should the implementer do?
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John Z. Li
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It depends on the platform. `abort` probably should terminate the program one way or another. – Jabberwocky Apr 27 '22 at 12:01
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1If I needed to implement it, I would use setjmp/longjmp in the runtime startup code. – wildplasser Apr 27 '22 at 19:04
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Fairly simple, in fact. In that case, the implementer of the C runtime needs to make sure that SIGABRT is delivered to signal, without help from the OS. It's purely inside a single process.
MSalters
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2what do you mean by "delivered to signal" if the OS does not support signals? – John Z. Li Apr 27 '22 at 12:07
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2@JohnZ.Li Function `signal` is part of the C standard library. There is no support by the OS required by the C standard. If you raise a signal, the C library has all it needs to find the callback registered with `signal` function. – Gerhardh Apr 27 '22 at 12:41