Need getParentProcessId() proc #25502
Description
Summary
The std/os library module includes getCurrentProcessId(), but not the equivalent getParentProcessId(). The parent Id is important, e.g. to detect whether the current process was started as a daemon by systemd, when ppid will be 1 on most modern linux systems, so the lack of this feature in the Nim standard library is an issue
Description
The code for getCurrentProcessId() is quite short-
proc getCurrentProcessId*(): int {.noWeirdTarget.} =
## Return current process ID.
##
## See also:
## * `osproc.processID(p: Process) <osproc.html#processID,Process>`_
when defined(windows):
proc GetCurrentProcessId(): DWORD {.stdcall, dynlib: "kernel32",
importc: "GetCurrentProcessId".}
result = GetCurrentProcessId().int
else:
result = getpid()
On linux, I believe adapting this to get the parent pid is as simple as changing the last line from getpid() to getppid().
From what I have found online, it is more complex on Windows. One solution (in C) is given here- https://gist.github.com/mattn/253013/d47b90159cf8ffa4d92448614b748aa1d235ebe4.
Unfortunately I am new to Nim and this is well beyond my own limited coding skills.
Alternatives
No response
Examples
No response
Backwards Compatibility
No response
Links
getppid() for Windows (C)
https://gist.github.com/mattn/253013/d47b90159cf8ffa4d92448614b748aa1d235ebe4