Add a test for wait4().

src/tests/libs/bsd/Jamfile

@@ -3,5 +3,6 @@ SubDir HAIKU_TOP src tests libs bsd ;
 UseHeaders [ FDirName $(HAIKU_TOP) headers compatibility bsd ] : true ;
 
 SimpleTest forkpty_test : forkpty.c : libbsd.so ;
+SimpleTest wait4_test : wait4_test.cpp : libbsd.so ;
 
 

src/tests/libs/bsd/wait4_test.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2007, Axel Dörfler, [email protected]. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/resource.h> 
+#define _BSD_SOURCE
+#include <sys/wait.h>
+#include <unistd.h>
+
+
+/*!
+	wait() should wait only once. If any argument is given, waitpid() should return
+	an error (and errno to ECHILD), since there is no child with that process group ID.
+*/
+
+
+int
+child2()
+{
+	sleep(2);
+	return 2;
+}
+
+
+//! exits before child 2
+int
+child1()
+{
+	setpgrp();
+		// put us into a new process group
+
+	pid_t child = fork();
+	if (child == 0)
+		return child2();
+
+	sleep(1);
+	return 1;
+}
+
+
+int
+main(int argc, char** argv)
+{
+	bool waitForGroup = argc > 1;
+
+	pid_t child = fork();
+	if (child == 0)
+		return child1();
+
+	struct rusage usage;
+	pid_t pid;
+	do {
+		int childStatus = -1;
+		pid = wait4(-1, &childStatus, 0, &usage);
+		printf("wait4() returned %ld (%s), child status %d\n",
+			pid, strerror(errno), childStatus);
+	} while (pid >= 0);
+
+	return 0;
+}
+