gh-127081: fix some un-thread-safe use of libc functions #132591
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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?
The libc setpwent, getpwent, and endpwent functions are not thread-safe. Protect them with mutexs in free-threading builds.
The dbm_* functions are not thread-safe, naturally. Add critical sections to protect their use.
The getlogin function is not thread-safe: replace with getlogin_r where available. Note that this function is untested (unit test is skipped with a note it caused CI failures as behaviour differs between NIX environments).
duaneg
changed the title
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Can you split the PR into multiple ones where each PR is dedicated to a single module please (dbm and gdbm can be put together)? it's easier to revert commits if needs arise and we can also merge them separately. |
Definitely! Good suggestion, thanks. |
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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: