c - Return value range of the main function -

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what standard main return values range? 255?

because 

int main(void){ return 256; } echo $? ;  # out 0

the standard doesn't say. 0, exit_success , exit_failure have (sort of) specified meanings. else depends on implementation.

at present time, unix-based systems support 8-bit return values. windows supports (at least) 32-bit return value. haven't checked whether 64-bit windows supports 64-bit return value, rather doubt it, since 64-bit windows still uses 32-bit int.


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