if __NR__newselect and __NR_select are unavailable, fall back to __NR_pselect6

1 files changed, 24 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/common/select.c b/libc/sysdeps/linux/common/select.c
index 9c065226b..03fda35b7 100644
--- a/libc/sysdeps/linux/common/select.c
+++ b/libc/sysdeps/linux/common/select.c
@@ -12,6 +12,27 @@
 
 extern __typeof(select) __libc_select;
 
+#if !defined(__NR__newselect) && !defined(__NR_select)
+
+# define __NR___libc_pselect6 __NR_pselect6
+_syscall6(int, __libc_pselect6, int, n, fd_set *, readfds, fd_set *, writefds,
+	fd_set *, exceptfds, const struct timespec *, timeout,
+	const sigset_t *, sigmask);
+
+int __libc_select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+                  struct timeval *timeout)
+{
+	struct timespec _ts, *ts = 0;
+	if (timeout) {
+		_ts.tv_sec = timeout->tv_sec;
+		_ts.tv_nsec = timeout->tv_usec * 1000;
+		ts = &_ts;
+	}
+	return __libc_pselect6(n, readfds, writefds, exceptfds, ts, 0);
+}
+
+#else
+
 #ifdef __NR__newselect
 # define __NR___libc_select __NR__newselect
 #else
@@ -19,6 +40,9 @@ extern __typeof(select) __libc_select;
 #endif
 _syscall5(int, __libc_select, int, n, fd_set *, readfds, fd_set *, writefds,
 		  fd_set *, exceptfds, struct timeval *, timeout);
+
+#endif
+
 libc_hidden_proto(select)
 weak_alias(__libc_select,select)
 libc_hidden_weak(select)