[src/bouyer-socketcan]: src/usr.bin/nc 727208

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8d97aaf5d794
branches:  bouyer-socketcan
changeset: 820829:8d97aaf5d794
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Feb 06 16:03:41 2017 +0000

description:
727208

diffstat:

 usr.bin/nc/atomicio.c |  69 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 69 insertions(+), 0 deletions(-)

diffs (73 lines):

diff -r 51a1f907dd99 -r 8d97aaf5d794 usr.bin/nc/atomicio.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/usr.bin/nc/atomicio.c     Mon Feb 06 16:03:41 2017 +0000
@@ -0,0 +1,69 @@
+/* $OpenBSD: atomicio.c,v 1.11 2012/12/04 02:24:47 deraadt Exp $ */
+/*
+ * Copyright (c) 2006 Damien Miller. All rights reserved.
+ * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
+ * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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 AUTHOR ``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 AUTHOR 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/cdefs.h>
+__RCSID("$NetBSD: atomicio.c,v 1.2.4.2 2017/02/06 16:03:41 christos Exp $");
+
+#include <errno.h>
+#include <poll.h>
+#include <unistd.h>
+
+#include "atomicio.h"
+
+/*
+ * ensure all of data on socket comes through. f==read || f==vwrite
+ */
+size_t
+atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
+{
+       char *s = _s;
+       size_t pos = 0;
+       ssize_t res;
+       struct pollfd pfd;
+
+       pfd.fd = fd;
+       pfd.events = f == read ? POLLIN : POLLOUT;
+       while (n > pos) {
+               res = (f) (fd, s + pos, n - pos);
+               switch (res) {
+               case -1:
+                       if (errno == EINTR)
+                               continue;
+                       if ((errno == EAGAIN) || (errno == ENOBUFS)) {
+                               (void)poll(&pfd, 1, -1);
+                               continue;
+                       }
+                       return 0;
+               case 0:
+                       errno = EPIPE;
+                       return pos;
+               default:
+                       pos += (size_t)res;
+               }
+       }
+       return (pos);
+}