New submission from Gregory P. Smith <g...@krypto.org>:
Another use of `subprocess preexec_fn=` that I've come across has been to call Linux's `prctl` in the child process before the `exec`. `_libc.prctl(_PR_SET_PDEATHSIG, value)` for example. Adding a linux_prctl_calls= parameter listing information about which prctl call(s) to make in the child before exec would satisfy this needed. No need to go overboard here, this is a _very_ low level syscall. users need to know what they're doing and will likely abstract use away from actual users via a wrapper library. i.e: Lets not attempt to reinvent the https://pythonhosted.org/python-prctl/ interface. Proposal: linux_prctl_calls: Sequence[tuple] Where every tuple indicates one prctl call. the tuple [0] contains a bool indicating if an error returned by that prctl call should be ignored or not. the tuple[1:6] contain the five int arguments to be passed to prctl. If the tuple is shorter than 2 elements, the remaining values are assumed 0. At most, a namedtuple type could be created for this purpose to allow the user to use the https://man7.org/linux/man-pages/man2/prctl.2.html argument names rather than just blindly listing a tuple. ``` namedtuple('LinuxPrctlDescription', field_names='check_error, option, arg2, arg3, arg4, arg5', defaults=(0,0,0,0)) ``` This existing helps https://bugs.python.org/issue38435 deprecate preexec_fn. ---------- components: Extension Modules, Library (Lib) messages: 383723 nosy: gregory.p.smith priority: normal severity: normal stage: needs patch status: open title: Add support for making Linux prctl(...) calls to subprocess type: enhancement versions: Python 3.10 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42736> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
