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 --- sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 + 1 file changed, 1 insertion(+) (limited to 'sysdeps/unix/sysv/linux/arm/le/libc.abilist') diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index 07fce73516..371274917a 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -187,6 +187,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 _Fork F GLIBC_2.34 ___adjtimex64 F GLIBC_2.34 __adjtime64 F GLIBC_2.34 __aio_suspend_time64 F -- cgit 1.4.1