From c32c868ab8b2b95724550d0130782c0767fc3bab Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Tue, 19 Jan 2021 09:26:31 -0300 Subject: posix: Add _Fork [BZ #4737] Austin Group issue 62 [1] dropped the async-signal-safe requirement for fork and provided a async-signal-safe _Fork replacement that does not run the atfork handlers. It will be included in the next POSIX standard. It allow to close a long standing issue to make fork AS-safe (BZ#4737). As indicated on the bug, besides the internal lock for the atfork handlers itself; there is no guarantee that the handlers itself will not introduce more AS-safe issues. The idea is synchronize fork with the required internal locks to allow children in multithread processes to use mostly of standard function (even though POSIX states only AS-safe function should be used). On signal handles, _Fork should be used intead and only AS-safe functions should be used. For testing, the new tst-_Fork only check basic usage. I also added a new tst-mallocfork3 which uses the same strategy to check for deadlock of tst-mallocfork2 but using threads instead of subprocesses (and it does deadlock if it replaces _Fork with fork). [1] https://austingroupbugs.net/view.php?id=62 --- posix/Versions | 1 + 1 file changed, 1 insertion(+) (limited to 'posix/Versions') diff --git a/posix/Versions b/posix/Versions index 5983144d01..ee1f412185 100644 --- a/posix/Versions +++ b/posix/Versions @@ -152,6 +152,7 @@ libc { GLIBC_2.30 { } GLIBC_2.34 { + _Fork; execveat; } GLIBC_PRIVATE { -- cgit v1.2.3