test: Add sigaction test

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

test/Makefile

@@ -4,6 +4,7 @@ SRCS	+= test-shmem-async.c
 SRCS	+= test-shmem-three-async.c
 SRCS	+= test-pipe-async.c
 SRCS	+= test-vdso.c
+SRCS	+= test-sigaction.c
 
 SRCS-TH	+= test-pthreads.c
 OBJS-TH += $(patsubst %.c,%.o,$(SRCS-TH))

test/test-sigaction.c

+#include <stdio.h>
+#include <stdlib.h>
+
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <signal.h>
+
+static void forked_handler(int sig)
+{
+	printf("%d: %s\n", getpid(), __func__);
+}
+
+static void primary_handler(int sig)
+{
+	printf("%d: %s\n", getpid(), __func__);
+}
+
+int main(int argc, char *argv[])
+{
+	struct sigaction act;
+	int pid;
+
+	printf("%s pid %d\n", argv[0], getpid());
+
+	pid = fork();
+	if (pid < 0) {
+		exit(-1);
+	} else if (pid == 0) {
+		act.sa_handler	= forked_handler;
+		act.sa_flags	= 0;
+		sigemptyset(&act.sa_mask);
+		sigaction(SIGTSTP, &act, 0);
+
+		while (1) {
+			kill(getppid(), SIGTSTP);
+			kill(getpid(), SIGTSTP);
+			sleep(1);
+		}
+
+	} else {
+		act.sa_handler	= primary_handler;
+		act.sa_flags	= 0;
+		sigemptyset(&act.sa_mask);
+		sigaction(SIGTSTP, &act, 0);
+
+		while (1) {
+			sleep(1);
+		}
+	}
+
+	return 0;
+}