[Bug libc/20178] New: posix_spawn{p} should not call exit

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20178

            Bug ID: 20178
           Summary: posix_spawn{p} should not call exit
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: adhemerval.zanella at linaro dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The new posix_spawn{p} implementation [1] call exit on failure case where it
should call _exit.  Although POSIX allows posix_spawn to call atfork handlers,
it introduces opportunities for atfork-related race conditions and add
performance overhead from handler calling (BZ#14499).

[1] Commit 9ff72da471a509a8c19791efe469f47fa6977410

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