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diff --git a/src/global/mail_command_client.c b/src/global/mail_command_client.c
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+/*++
+/* NAME
+/* mail_command_client 3
+/* SUMMARY
+/* single-command client
+/* SYNOPSIS
+/* #include <mail_proto.h>
+/*
+/* int mail_command_client(class, name, proto, type, attr, ...)
+/* const char *class;
+/* const char *name;
+/* const char *proto;
+/* int type;
+/* const char *attr;
+/* DESCRIPTION
+/* This module implements a client interface for single-command
+/* clients: a client that sends a single command and expects
+/* a single completion status code.
+/*
+/* Arguments:
+/* .IP class
+/* Service type: MAIL_CLASS_PUBLIC or MAIL_CLASS_PRIVATE
+/* .IP name
+/* Service name (master.cf).
+/* .IP proto
+/* The expected protocol name in the server announcement.
+/* .IP "type, attr, ..."
+/* Attribute information as defined in attr_print(3).
+/* DIAGNOSTICS
+/* The result is -1 if the request could not be sent, otherwise
+/* the result is the status reported by the server.
+/* Warnings: problems connecting to the requested service.
+/* Fatal: out of memory.
+/* SEE ALSO
+/* attr_print(3), send attributes over byte stream
+/* mail_command_server(3), server interface
+/* mail_proto(3h), client-server protocol
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <stdlib.h> /* 44BSD stdarg.h uses abort() */
+#include <stdarg.h>
+
+/* Utility library. */
+
+#include <vstream.h>
+#include <msg.h>
+
+/* Global library. */
+
+#include <mail_proto.h>
+
+/* mail_command_client - single-command transaction with completion status */
+
+int mail_command_client(const char *class, const char *name,
+ const char *proto,...)
+{
+ va_list ap;
+ VSTREAM *stream;
+ int status;
+
+ /*
+ * Talk a little protocol with the specified service.
+ *
+ * This function is used for non-critical services where it is OK to back
+ * off after the first error. Log what communication stage failed, to
+ * facilitate trouble analysis.
+ */
+ if ((stream = mail_connect(class, name, BLOCKING)) == 0) {
+ msg_warn("connect to %s/%s: %m", class, name);
+ return (-1);
+ }
+ if (attr_scan(stream, ATTR_FLAG_STRICT,
+ RECV_ATTR_STREQ(MAIL_ATTR_PROTO, proto),
+ ATTR_TYPE_END) != 0) {
+ msg_warn("read %s: %m", VSTREAM_PATH(stream));
+ status = -1;
+ } else if (va_start(ap, proto),
+ (status = attr_vprint(stream, ATTR_FLAG_NONE, ap)),
+ va_end(ap),
+ (status != 0)) {
+ msg_warn("write %s: %m", VSTREAM_PATH(stream));
+ status = -1;
+ } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+ RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+ ATTR_TYPE_END) != 1) {
+ msg_warn("write/read %s: %m", VSTREAM_PATH(stream));
+ status = -1;
+ }
+ (void) vstream_fclose(stream);
+ return (status);
+}