[all-commits] [llvm/llvm-project] 86bde5: [libc] implement prctl (#74386)

[Schrodinger ZHU Yifan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 86bde5adc8f20a619c7ccbfee5d9bf92c5429226
      https://github.com/llvm/llvm-project/commit/86bde5adc8f20a619c7ccbfee5d9bf92c5429226
  Author: Schrodinger ZHU Yifan <yifanzhu at rochester.edu>
  Date:   2023-12-05 (Tue, 05 Dec 2023)

  Changed paths:
    M libc/config/linux/aarch64/entrypoints.txt
    M libc/config/linux/arm/entrypoints.txt
    M libc/config/linux/riscv/entrypoints.txt
    M libc/config/linux/x86_64/entrypoints.txt
    M libc/include/sys/prctl.h.def
    M libc/src/sys/CMakeLists.txt
    A libc/src/sys/prctl/CMakeLists.txt
    A libc/src/sys/prctl/linux/CMakeLists.txt
    A libc/src/sys/prctl/linux/prctl.cpp
    A libc/src/sys/prctl/prctl.h
    M libc/test/src/sys/CMakeLists.txt
    A libc/test/src/sys/prctl/CMakeLists.txt
    A libc/test/src/sys/prctl/linux/CMakeLists.txt
    A libc/test/src/sys/prctl/linux/prctl_test.cpp

  Log Message:
  -----------
  [libc] implement prctl (#74386)

Implement `prctl` as specified in
https://man7.org/linux/man-pages/man2/prctl.2.html.

This patch also includes test cases covering two simple use cases:

1. `PR_GET_NAME/PR_SET_NAME`: where userspace data is passed via arg2.
2. `PR_GET_THP_DISABLE`: where return value is passed via syscal retval.