30/33: daemon: Avoid kill -1 bug on the Hurd.

[guix-commits]

janneke pushed a commit to branch wip-hurd
in repository guix.

commit c6ee320b4299b02f7c59299c798748d7eecb457a
Author: Manolis Ragkousis <address@hidden>
AuthorDate: Wed Dec 28 02:49:22 2016 +0200

    daemon: Avoid kill -1 bug on the Hurd.
    
    This allows for native builds on the Hurd, doing
    
        sudo ./pre-inst-env guix-daemon --disable-chroot 
--build-users-group=guixbuild &
        ./pre-inst-env guix build hello
    
    * nix/libutil/util.cc (killUser)[__GNU__]: Avoid kill -1 bug; kill only
    current process and ignore SIGKILL status in parent.
---
 nix/libutil/util.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/nix/libutil/util.cc b/nix/libutil/util.cc
index fb2dfad..17d145b 100644
--- a/nix/libutil/util.cc
+++ b/nix/libutil/util.cc
@@ -861,6 +861,10 @@ void killUser(uid_t uid)
                which means "follow POSIX", which we don't want here
                  */
             if (syscall(SYS_kill, -1, SIGKILL, false) == 0) break;
+#elif __GNU__
+            /* Killing all a user's processes using PID=-1 does currently
+               not work on the Hurd.  */
+            if (kill(getpid(), SIGKILL) == 0) break;
 #else
             if (kill(-1, SIGKILL) == 0) break;
 #endif
@@ -873,6 +877,10 @@ void killUser(uid_t uid)
     });
 
     int status = pid.wait(true);
+#if __GNU__
+    /* When the child killed itself, status = SIGKILL.  */
+    if (status == SIGKILL) return;
+#endif
     if (status != 0)
         throw Error(format("cannot kill processes for uid `%1%': %2%") % uid % 
statusToString(status));