Add sigqueue test code.

tools/regression/sigqueue/Makefile

@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+SUBDIR=sigqtest1
+
+.include <bsd.subdir.mk>

tools/regression/sigqueue/sigqtest1/Makefile

@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+PROG=sigqtest1
+LDADD+=
+NO_MAN=
+DEBUG_FLAGS=-g
+
+.include <bsd.prog.mk>

tools/regression/sigqueue/sigqtest1/sigqtest1.c

@@ -0,0 +1,49 @@
+/* $FreeBSD$ */
+#include <signal.h>
+#include <stdio.h>
+#include <err.h>
+#include <errno.h>
+
+int received;
+
+void handler(int sig, siginfo_t *si, void *ctx)
+{
+	if (si->si_code != SI_QUEUE)
+		errx(1, "si_code != SI_QUEUE");
+	if (si->si_value.sival_int != received)
+		errx(1, "signal is out of order");
+	received++;
+}
+
+int main()
+{
+	struct sigaction sa;
+	union sigval val;
+	int ret;
+	int i;
+	sigset_t set;
+
+	sa.sa_flags = SA_SIGINFO;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_sigaction = handler;
+	sigaction(SIGRTMIN, &sa, NULL);
+	sigemptyset(&set);
+	sigaddset(&set, SIGRTMIN);
+	sigprocmask(SIG_BLOCK, &set, NULL);
+	i = 0;
+	for (;;) {
+		val.sival_int = i;
+		ret = sigqueue(getpid(), SIGRTMIN, val);
+		if (ret == -1) {
+			if (errno != EAGAIN) {
+				errx(1, "errno != EAGAIN");
+			}
+			break;
+		}
+		i++;
+	}
+	sigprocmask(SIG_UNBLOCK, &set, NULL);
+	if (received != i)
+		errx(1, "error, signal lost");
+	printf("OK\n");
+}