Add thread-safety to libc, so that libc_r will build (on i386 at least).

All POSIX libc api now there (to P1003.1c/D10)
  (more md stuff is needed for other libc/arch/*)
  (setlogin is no longer a special syscall)
Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS).
Doc some re-entrant routines
Add libc_r to intro(3)
dig() uses some libc srcs and an extra -I was needed there.
Add more md stuff to libc_r.
Update includes for the pthreads api
Update libc_r TODO

1 files changed, 49 insertions, 0 deletions

diff --git a/lib/libc/stdio/flockfile.c b/lib/libc/stdio/flockfile.c
new file mode 100644
index 00000000000..d720aee991a
--- /dev/null
+++ b/lib/libc/stdio/flockfile.c
@@ -0,0 +1,49 @@
+/*	$OpenBSD: flockfile.c,v 1.1 1998/11/20 11:18:48 d Exp $	*/
+
+#include <stdio.h>
+#include "thread_private.h"
+
+#ifndef _THREAD_SAFE
+
+/*
+ * Subroutine versions of the macros in <stdio.h>
+ * Note that these are all no-ops because libc does not do threads.
+ */
+
+#undef flockfile
+#undef ftrylockfile
+#undef funlockfile
+#undef _flockfile_debug
+
+void
+flockfile(fp)
+	FILE * fp;
+{
+}
+
+int
+ftrylockfile(fp)
+	FILE * fp;
+{
+	return 0;
+}
+
+void
+funlockfile(fp)
+	FILE * fp;
+{
+}
+
+void
+_flockfile_debug(fp, fname, lineno)
+	FILE * fp;
+	const char * fname;
+	int lineno;
+{
+}
+
+#else /* _THREAD_SAFE */
+
+/* Actual implementation of file locking in libc_r/uthread/uthread_file.c */
+
+#endif /* _THREAD_SAFE */