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+/*++
+/* NAME
+/* mail_trigger 3
+/* SUMMARY
+/* trigger a mail service
+/* SYNOPSIS
+/* #include <mail_proto.h>
+/*
+/* int mail_trigger(class, service, request, length)
+/* const char *class;
+/* const char *service;
+/* const char *request;
+/* ssize_t length;
+/* DESCRIPTION
+/* mail_trigger() wakes up the specified mail subsystem, by
+/* sending it the specified request. In the case of non-FIFO
+/* server endpoints, a short-running program should invoke
+/* event_drain() to ensure proper request delivery.
+/*
+/* Arguments:
+/* .IP class
+/* Name of a class of local transport channel endpoints,
+/* either \fIpublic\fR (accessible by any local user) or
+/* \fIprivate\fR (administrative access only).
+/* .IP service
+/* The name of a local transport endpoint within the named class.
+/* .IP request
+/* A string. The list of valid requests is service specific.
+/* .IP length
+/* The length of the request string.
+/* DIAGNOSTICS
+/* The result is -1 in case of problems, 0 otherwise.
+/* Warnings are logged.
+/* BUGS
+/* Works with FIFO or UNIX-domain services only.
+/*
+/* Should use master.cf to find out what transport to use.
+/* SEE ALSO
+/* fifo_trigger(3) trigger a FIFO-based service
+/* unix_trigger(3) trigger a UNIX_domain service
+/* 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <iostuff.h>
+#include <trigger.h>
+#include <warn_stat.h>
+
+/* Global library. */
+
+#include "mail_params.h"
+#include "mail_proto.h"
+
+/* mail_trigger - trigger a service */
+
+int mail_trigger(const char *class, const char *service,
+ const char *req_buf, ssize_t req_len)
+{
+ struct stat st;
+ char *path;
+ int status;
+
+ /*
+ * XXX Some systems cannot tell the difference between a named pipe
+ * (fifo) or a UNIX-domain socket. So we may have to try both.
+ */
+ path = mail_pathname(class, service);
+ if ((status = stat(path, &st)) < 0) {
+ msg_warn("unable to look up %s: %m", path);
+ } else if (S_ISFIFO(st.st_mode)) {
+ status = fifo_trigger(path, req_buf, req_len, var_trigger_timeout);
+ if (status < 0 && S_ISSOCK(st.st_mode))
+ status = LOCAL_TRIGGER(path, req_buf, req_len, var_trigger_timeout);
+ } else if (S_ISSOCK(st.st_mode)) {
+ status = LOCAL_TRIGGER(path, req_buf, req_len, var_trigger_timeout);
+ } else {
+ msg_warn("%s is not a socket or a fifo", path);
+ status = -1;
+ }
+ myfree(path);
+ return (status);
+}