Initial import

libc/sock/poll.c

@@ -0,0 +1,46 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ This program is free software; you can redistribute it and/or modify         │
+│ it under the terms of the GNU General Public License as published by         │
+│ the Free Software Foundation; version 2 of the License.                      │
+│                                                                              │
+│ This program is distributed in the hope that it will be useful, but          │
+│ WITHOUT ANY WARRANTY; without even the implied warranty of                   │
+│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU             │
+│ General Public License for more details.                                     │
+│                                                                              │
+│ You should have received a copy of the GNU General Public License            │
+│ along with this program; if not, write to the Free Software                  │
+│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
+│ 02110-1301 USA                                                               │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/calls.h"
+#include "libc/calls/internal.h"
+#include "libc/dce.h"
+#include "libc/sock/internal.h"
+#include "libc/sock/sock.h"
+
+/**
+ * Waits for something to happen on multiple file descriptors at once.
+ *
+ * @param fds[𝑖].fd should have been created with SOCK_NONBLOCK passed
+ *     to socket() or accept4()
+ * @param fds[𝑖].events flags can have POLL{IN,OUT,PRI}
+ * @param timeout_ms if 0 means don't wait and -1 means wait forever
+ * @return number of items fds whose revents field has been set to
+ *     nonzero to describe its events, or -1 w/ errno
+ * @return fds[𝑖].revents flags can have:
+ *     (fds[𝑖].events & POLL{IN,OUT,PRI,HUP,ERR,NVAL})
+ * @asyncsignalsafe
+ * @see ppoll()
+ */
+int poll(struct pollfd *fds, uint64_t nfds, int32_t timeout_ms) {
+  if (!IsWindows()) {
+    return poll$sysv(fds, nfds, timeout_ms);
+  } else {
+    return poll$nt(fds, nfds, timeout_ms);
+  }
+}