ch3/sock: ignore SIGUSR1

When hydra's -disable-auto-cleanup, it sends SIGUSR1 to notify process
failures. ch3:sock does not support this feature, but at least ignore
the signal to prevent it being killed by it.

configure.ac

@@ -3699,6 +3699,10 @@ if test "$enable_g_mem" != "yes" ; then
     fi
 fi
 
+# make sure we support signal
+AC_CHECK_HEADERS(signal.h)
+AC_CHECK_FUNCS(signal)
+
 # ----------------------------------------------------------------------------
 # Look for some non-posix, but commonly provided functions
 # ----------------------------------------------------------------------------

src/mpid/ch3/channels/nemesis/subconfigure.m4

@@ -94,10 +94,6 @@ fi
 AC_ARG_ENABLE(fast, [--enable-fast - pick the appropriate options for fast execution.
 This turns off error checking and timing collection],,enable_fast=no)
 
-# make sure we support signal
-AC_CHECK_HEADERS(signal.h)
-AC_CHECK_FUNCS(signal)
-
 nemesis_nets_dirs=""
 nemesis_nets_strings=""
 nemesis_nets_array=""   

src/mpid/ch3/channels/sock/src/sock.c

@@ -1200,6 +1200,12 @@ int MPIDI_CH3I_Sock_init(void)
     MPIDI_CH3I_DBG_SOCK_CONNECT = MPL_dbg_class_alloc("SOCK_CONNECT", "sock_connect");
 #endif
 
+#ifdef HAVE_SIGNAL
+    /* ch3:sock do not support fault-tolerance feature, disable the signal so
+     * hydra's -disable-auto-cleanup can still work */
+    signal(SIGUSR1, SIG_IGN);
+#endif
+
     MPIDI_CH3I_Socki_initialized++;
 
     MPIR_FUNC_EXIT;

src/mpid/ch4/subconfigure.m4

@@ -395,10 +395,6 @@ if test "$ac_cv_func_gethostname" = "yes" ; then
     PAC_FUNC_NEEDS_DECL([#include <unistd.h>],gethostname)
 fi
 
-# make sure we support signal
-AC_CHECK_HEADERS(signal.h)
-AC_CHECK_FUNCS(signal)
-
 AC_CONFIG_FILES([
 src/mpid/ch4/src/mpid_ch4_net_array.c
 src/mpid/ch4/include/netmodpre.h