gh-127081: use re-entrant variants of get{proto,serv}by{name,port}
#132750
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Add configure tests and defines for getservbyname_r, getservbyport_r, and getprotobyname_r. Use these if available, otherwise fallback to the thread-unsafe variants. Add a unit test to exercise getprotobyname, which is currently untested. TODO: - Are there any platforms which define the unsafe variants but not the re-entrant ones? If not we can simplify the #ifdef hell somewhat. - Do the re-entrant functions have the same signature on all platforms? - These changes follow the existing code's practice: allocate a fixed-size (and overly large) buffer, and don't properly handle the error case if it is too small. Should this be fixed? If so should existing code also be fixed?
picnixz
changed the title
get{proto,serv}by{name,port}
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Add configure tests and defines for getservbyname_r, getservbyport_r, and getprotobyname_r. Use these if available, otherwise fallback to the thread-unsafe variants.
Add a unit test to exercise getprotobyname, which is currently untested.
TODO: