some tweaks under libc/ needed for nptl

 * updated kernel-features.h
 * system is provided by pt-system with nptl
 * _exit should do exit_group with nptl
 * tsd tls ptr in libc
 * rt_sigwaitinfo impl added

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/libc/misc/pthread/tsd.c b/libc/misc/pthread/tsd.c
new file mode 100644
index 000000000..434938d97
--- /dev/null
+++ b/libc/misc/pthread/tsd.c
@@ -0,0 +1,11 @@
+/* libpthread sets _dl_error_catch_tsd to point to this function.
+   We define it here instead of in libpthread so t here instead of in libpthread so that it doesn't
+   need to have a TLS segment of its own just for this one pointer.  */
+
+void ** __attribute__ ((const))
+__libc_dl_error_tsd (void)
+{
+  static __thread void *data __attribute__ ((tls_model ("initial-exec")));
+  return &data;
+}
+