Module Name: src
Committed By: martin
Date: Wed May 13 18:08:38 UTC 2020
Modified Files:
src/lib/libc/gen [netbsd-9]: pthread_atfork.c
src/libexec/ld.elf_so [netbsd-9]: rtld.c rtld.h symbols.map
Log Message:
Pull up following revision(s) (requested by chs in ticket #907):
libexec/ld.elf_so/rtld.c: revision 1.205
libexec/ld.elf_so/rtld.h: revision 1.140
libexec/ld.elf_so/symbols.map: revision 1.3
libexec/ld.elf_so/symbols.map: revision 1.4
lib/libc/gen/pthread_atfork.c: revision 1.13
lib/libc/gen/pthread_atfork.c: revision 1.14
libexec/ld.elf_so/rtld.h: revision 1.139
libexec/ld.elf_so/rtld.c: revision 1.204
Introduce intermediate locking for fork, so that the dynamic linker is
in a consistent state. This most importantly avoids races between dlopen
and friends and fork, potentially resulting in dead locks in the child
when it itself tries to acquire locks.
Rename __atomic_fork to __locked_fork and give it &errno as argument.
rtld and libc use different storage, so the initial version would
incorrectly report the failure reason for fork().
There is still a small race condition inside ld.elf_so as it doesn't use
thread-safe errno internally, but that's a more contained internal
issue.
To generate a diff of this commit:
cvs rdiff -u -r1.10 -r1.10.18.1 src/lib/libc/gen/pthread_atfork.c
cvs rdiff -u -r1.197.2.3 -r1.197.2.4 src/libexec/ld.elf_so/rtld.c
cvs rdiff -u -r1.136 -r1.136.2.1 src/libexec/ld.elf_so/rtld.h
cvs rdiff -u -r1.2 -r1.2.8.1 src/libexec/ld.elf_so/symbols.map
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
