X-Git-Url: https://git.decadent.org.uk/gitweb/?a=blobdiff_plain;ds=sidebyside;f=support%2Fnfs%2Fatomicio.c;fp=support%2Fnfs%2Fatomicio.c;h=1fb1ff9ce5ba358237dff328fcf284b4eb5c57be;hb=c117b7a1f29db65d139824ba5bab2a58bf5609e2;hp=0000000000000000000000000000000000000000;hpb=8c217b9623c8304608196aeb2f7360abfdf987c8;p=nfs-utils.git

diff --git a/support/nfs/atomicio.c b/support/nfs/atomicio.c
new file mode 100644
index 0000000..1fb1ff9
--- /dev/null
+++ b/support/nfs/atomicio.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2002 Marius Aamodt Eriksen <marius@monkey.org>
+ * 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/types.h>
+#include <unistd.h>
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+/*
+ * ensure all of data on socket comes through. f==read || f==write
+ */
+ssize_t
+atomicio(
+	ssize_t (*f) (int, void*, size_t),
+	int fd,
+	void *_s,
+	size_t n)
+{
+	char *s = _s;
+	ssize_t res;
+	size_t pos = 0;
+
+	while (n > pos) {
+		res = (f) (fd, s + pos, n - pos);
+		switch (res) {
+		case -1:
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+		case 0:
+			if (pos != 0)
+				return (pos);
+			return (res);
+		default:
+			pos += res;
+		}
+	}
+	return (pos);
+}