[all-commits] [llvm/llvm-project] 099997: tsan: fix epoll_pwait2 interceptor

[Dmitry Vyukov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 099997540f45a50f1bfb1da85cd222e3509b87cb
      https://github.com/llvm/llvm-project/commit/099997540f45a50f1bfb1da85cd222e3509b87cb
  Author: Dmitry Vyukov <dvyukov at google.com>
  Date:   2022-11-30 (Wed, 30 Nov 2022)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_errno_codes.h
    M compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp

  Log Message:
  -----------
  tsan: fix epoll_pwait2 interceptor

epoll_pwait2 is new and may not be present in libc and/or kernel.
Since we effectively add it to libc (as will be probed by the program
using dlsym or a weak function pointer) we need to handle the case
when it's not present in the actual libc.

Reviewed By: melver

Differential Revision: https://reviews.llvm.org/D138929