initgroups
----------

LSB specification:
 https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-initgroups-3.html

Documentation:

  * Setting the Group IDs (libc),

  * man initgroups.

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * This function is unsafe to call between fork and exec if the parent process is multi-threaded.  Instead, use getgroups or getgrouplist (or use the gnulib module mgetgroups) before forking, and setgroups in the child.

  * This function is missing on some platforms: mingw, MSVC 14.