auto import from //depot/cupcake/@135843
diff --git a/libc/unistd/pselect.c b/libc/unistd/pselect.c
new file mode 100644
index 0000000..76ce2c0
--- /dev/null
+++ b/libc/unistd/pselect.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <sys/select.h>
+#include <signal.h>
+#include <pthread.h>
+
+int
+pselect(int n, fd_set* readfds, fd_set* writefds, fd_set* errfds,
+ const struct timespec* timeout, const sigset_t* sigmask)
+{
+ sigset_t oldmask;
+ int result;
+ struct timeval tv, *tv_timeout = NULL;
+
+ if (sigmask != NULL)
+ pthread_sigmask( SIG_SETMASK, sigmask, &oldmask );
+
+ if (timeout != NULL) {
+ tv_timeout = &tv;
+ tv.tv_sec = timeout->tv_sec;
+ tv.tv_usec = (timeout->tv_nsec + 999)/1000; // round up
+ if (tv.tv_usec >= 1000000) {
+ tv.tv_sec += 1;
+ tv.tv_usec -= 1000000;
+ }
+ }
+
+ result = select( n, readfds, writefds, errfds, tv_timeout );
+
+ if (sigmask != NULL)
+ pthread_sigmask( SIG_SETMASK, &oldmask, NULL );
+
+ return result;
+}