add a service to reap zombies, use it in SLIRP

SLIRP -smb support wants to fork a process and forget about reaping it.
To please it, add a generic service to register a process id and let
QEMU reap it.  In the future it could be enhanced to pass a status,
but this would be unused.

With this in place, the SIGCHLD signal handler would not stomp on pclose
anymore.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 0 insertions, 9 deletions

diff --git a/os-posix.c b/os-posix.c
index eb49e2f..3204197 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -67,11 +67,6 @@ static void termsig_handler(int signal, siginfo_t *info, void *c)
     qemu_system_killed(info->si_signo, info->si_pid);
 }
 
-static void sigchld_handler(int signal)
-{
-    waitpid(-1, NULL, WNOHANG);
-}
-
 void os_setup_signal_handling(void)
 {
     struct sigaction act;
@@ -82,10 +77,6 @@ void os_setup_signal_handling(void)
     sigaction(SIGINT,  &act, NULL);
     sigaction(SIGHUP,  &act, NULL);
     sigaction(SIGTERM, &act, NULL);
-
-    act.sa_handler = sigchld_handler;
-    act.sa_flags = SA_NOCLDSTOP;
-    sigaction(SIGCHLD, &act, NULL);
 }
 
 /* Find a likely location for support files using the location of the binary.