Tweaks for sigqueue tests:

- slightly adjust code for style, sort headers.
- in sigqtest2, print received signals, to make it easy to see why test
  failed.
- in sigqtest2, job_control_test(), cover a race by adding sleep after
  child stopped itself to allow for SIGCHLD due to stop and exit to not
  be coalesced.

MFC after:	2 weeks

tools/regression/sigqueue/sigqtest1/sigqtest1.c

@@ -1,12 +1,14 @@
 /* $FreeBSD$ */
-#include <signal.h>
-#include <stdio.h>
 #include <err.h>
 #include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
 
 int received;
 
-void handler(int sig, siginfo_t *si, void *ctx)
+void
+handler(int sig, siginfo_t *si, void *ctx)
 {
 	if (si->si_code != SI_QUEUE)
 		errx(1, "si_code != SI_QUEUE");
@@ -15,7 +17,8 @@ void handler(int sig, siginfo_t *si, void *ctx)
 	received++;
 }
 
-int main()
+int
+main()
 {
 	struct sigaction sa;
 	union sigval val;

tools/regression/sigqueue/sigqtest2/sigqtest2.c

@@ -1,24 +1,29 @@
 /* $FreeBSD$ */
-#include <signal.h>
-#include <stdio.h>
-#include <err.h>
-#include <errno.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 int stop_received;
 int exit_received;
 int cont_received;
 
-void job_handler(int sig, siginfo_t *si, void *ctx)
+void
+job_handler(int sig, siginfo_t *si, void *ctx)
 {
 	int status;
 	int ret;
 
 	if (si->si_code == CLD_STOPPED) {
+		printf("%d: stop received\n", si->si_pid);
 		stop_received = 1;
 		kill(si->si_pid, SIGCONT);
 	} else if (si->si_code == CLD_EXITED) {
+		printf("%d: exit received\n", si->si_pid);
 		ret = waitpid(si->si_pid, &status, 0);
 		if (ret == -1)
 			errx(1, "waitpid");
@@ -26,11 +31,13 @@ void job_handler(int sig, siginfo_t *si, void *ctx)
 			errx(1, "!WIFEXITED(status)");
 		exit_received = 1;
 	} else if (si->si_code == CLD_CONTINUED) {
+		printf("%d: cont received\n", si->si_pid);
 		cont_received = 1;
 	}
 }
 
-void job_control_test()
+void
+job_control_test(void)
 {
 	struct sigaction sa;
 	pid_t pid;
@@ -43,9 +50,12 @@ void job_control_test()
 	stop_received = 0;
 	cont_received = 0;
 	exit_received = 0;
+	fflush(stdout);
 	pid = fork();
 	if (pid == 0) {
+		printf("child %d\n", getpid());
 		kill(getpid(), SIGSTOP);
+		sleep(2);
 		exit(1);
 	}
 
@@ -60,11 +70,13 @@ void job_control_test()
 	printf("job control test OK.\n");
 }
 
-void rtsig_handler(int sig, siginfo_t *si, void *ctx)
+void
+rtsig_handler(int sig, siginfo_t *si, void *ctx)
 {
 }
 
-int main()
+int
+main()
 {
 	struct sigaction sa;
 	sigset_t set;