_exit(2) and _Exit(2)

[Alejandro Colomar]

Hi Florian!

I'm revising the _exit(2) manual page (soon to be moved to _exit(3)).
While there, I noticed something a bit ambiguous/unclear.

_Exit() is specified as equivalent to _exit().

Then, in NOTES we have text saying that the behavior of _exit() changed
from calling SYS_exit to calling exit_group(2).  That text explicitly
talks about _exit(), and not generically about both functions; I suspect
that's just a wording mistake, and not an intentional one.

The commit that changed glibc seems to be

	commit 8fabe0e632bd441c760f878d1022c378f04f8497
	Author: Florian Weimer <fweimer@redhat.com>
	Date:   2022-08-04 06:17:50 +0200

	    Linux: Remove exit system call from _exit
	    
	    exit only terminates the current thread, not the whole process, so it
	    is the wrong fallback system call in this context.  All supported
	    Linux versions implement the exit_group system call anyway.

It is unclear to me (both from the text of the manual page and also from
the glibc change) whether that change also affected _Exit() or if that
had always used exit_group(2).  I presume it has always been an alias
for _exit(2) and thus it was also affected by that patch.

Could you please confirm?


Have a lovely night!
Alex

-- 
<https://www.alejandro-colomar.es>
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