1 files changed, 97 insertions, 0 deletions
diff --git a/usr.sbin/smtpd/atomic.c b/usr.sbin/smtpd/atomic.c
new file mode 100644
index 00000000000..ce245fedaad
--- /dev/null
+++ b/usr.sbin/smtpd/atomic.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2008 Charles Longeau <chl@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/tree.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+
+#include <err.h>
+#include <errno.h>
+#include <event.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "smtpd.h"
+
+ssize_t
+atomic_write(int d, const void *buf, size_t nbytes)
+{
+	ssize_t ret;
+	size_t n = nbytes;
+
+	do {
+		ret = write(d, buf, n);
+		if (ret == -1 && errno != EINTR)
+			return -1;
+		if (ret != -1)
+			n -= ret;
+	} while (n > 0 || (ret == -1 && errno == EINTR));
+
+	return nbytes;
+}
+
+ssize_t
+atomic_read(int d, void *buf, size_t nbytes)
+{
+	ssize_t ret;
+	size_t n = nbytes;
+
+	do {
+		ret = read(d, buf, n);
+		if (ret == -1 && errno != EINTR)
+			return -1;
+		if (ret != -1)
+			n -= ret;
+
+		if (ret == 0 && n != 0)
+			return -1;
+
+	} while (n > 0 || (ret == -1 && errno == EINTR));
+
+	return nbytes;
+}
+
+ssize_t
+atomic_printfd(int d, const char *fmt, ...)
+{
+	int ret;
+	char *buf;
+
+	va_list ap;
+	va_start(ap, fmt);
+
+	if ((ret = vasprintf(&buf, fmt, ap)) == -1) {
+		va_end(ap);
+		return -1;
+	}
+	va_end(ap);
+
+	ret = atomic_write(d, buf, ret);
+	free(buf);
+
+	return ret;
+}