Added small setpgid() test.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24043 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/system/libroot/posix/Jamfile

@@ -14,6 +14,8 @@ SimpleTest signal_test
 	: signal_test.cpp
 ;
 
+SimpleTest setpgid_test : setpgid_test.cpp ;
+
 SimpleTest setjmp_test
 	: setjmp_test.c
 ;

src/tests/system/libroot/posix/setpgid_test.cpp

@@ -0,0 +1,68 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+int
+main()
+{
+	pid_t parentPID = getpid();
+	printf("parent pid: %d\n", parentPID);
+	printf("parent pgid: %d\n", getpgrp());
+
+	pid_t childPID = fork();
+	if (childPID < 0) {
+		fprintf(stderr, "fork() failed: %s\n", strerror(errno));
+		exit(1);
+	} else if (childPID == 0) {
+		// child
+		childPID = getpid();
+		printf("child  pid: %d, pgid: %d\n", childPID, getpgrp());
+
+		printf("child  setpgid(0, 0)\n");
+		if (setpgid(0, 0) < 0) {
+			fprintf(stderr, "child: first setpgid() failed: %s\n", strerror(errno));
+			exit(1);
+		}
+//		printf("child  setsid()\n");
+//		if (setsid() < 0) {
+//			fprintf(stderr, "child: setsid() failed: %s\n", strerror(errno));
+//			exit(1);
+//		}
+
+		printf("child  pgid: %d\n", getpgrp());
+
+		pid_t grandChildPID = fork();
+		if (grandChildPID < 0) {
+			fprintf(stderr, "fork() 2 failed: %s\n", strerror(errno));
+			exit(1);
+		} else if (grandChildPID == 0) {
+			// grand child
+			grandChildPID = getpid();
+			printf("gchild pid: %d, pgid: %d\n", grandChildPID, getpgrp());
+			sleep(2);
+			printf("gchild pid: %d, pgid: %d\n", grandChildPID, getpgrp());
+		} else {
+			// child
+			sleep(1);
+
+			printf("child  setpgid(0, %d)\n", parentPID);
+			if (setpgid(0, parentPID) < 0) {
+//			printf("child  setpgid(0, 0)\n");
+//			if (setpgid(0, 0) < 0) {
+				fprintf(stderr, "child: second setpgid() failed: %s\n", strerror(errno));
+				exit(1);
+			}
+
+			printf("child  pgid: %d\n", getpgrp());
+		}
+
+	} else {
+		// parent
+		sleep(3);
+	}
+
+	return 0;
+}