added an empty implementation of confstr()

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21810 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/unistd.h

@@ -111,6 +111,7 @@ extern int      getdtablesize(void);
 extern long		sysconf(int name);
 extern long		fpathconf(int fd, int name);
 extern long		pathconf(const char *path, int name);
+extern size_t		confstr(int name, char *buf, size_t len);
 
 /* process functions */
 extern pid_t	fork(void);

src/system/libroot/posix/unistd/conf.c

@@ -100,3 +100,12 @@ pathconf(const char *path, int name)
 	return fpathconf(-1, name);
 }
 
+
+size_t 
+confstr(int name, char *buf, size_t len)
+{
+	// ToDo: find out what BeOS supports here
+	errno = EINVAL;
+	return 0;
+}
+