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/*++
/* NAME
/* inet_trigger 3
/* SUMMARY
/* wakeup INET-domain server
/* SYNOPSIS
/* #include <trigger.h>
/*
/* int inet_trigger(service, buf, len, timeout)
/* char *service;
/* const char *buf;
/* ssize_t len;
/* int timeout;
/* DESCRIPTION
/* inet_trigger() wakes up the named INET-domain server by making
/* a brief connection to it and by writing the contents of the
/* named buffer.
/*
/* The connection is closed by a background thread. Some kernels
/* cannot handle client-side disconnect before the server has
/* received the message.
/*
/* Arguments:
/* .IP service
/* Name of the communication endpoint.
/* .IP buf
/* Address of data to be written.
/* .IP len
/* Amount of data to be written.
/* .IP timeout
/* Deadline in seconds. Specify a value <= 0 to disable
/* the time limit.
/* DIAGNOSTICS
/* The result is zero in case of success, -1 in case of problems.
/* BUGS
/* SEE ALSO
/* inet_connect(3), INET-domain client
/* 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/socket.h>
#include <unistd.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <connect.h>
#include <iostuff.h>
#include <mymalloc.h>
#include <events.h>
#include <trigger.h>
struct inet_trigger {
int fd;
char *service;
};
/* inet_trigger_event - disconnect from peer */
static void inet_trigger_event(int event, void *context)
{
struct inet_trigger *ip = (struct inet_trigger *) context;
static const char *myname = "inet_trigger_event";
/*
* Disconnect.
*/
if (event == EVENT_TIME)
msg_warn("%s: read timeout for service %s", myname, ip->service);
event_disable_readwrite(ip->fd);
event_cancel_timer(inet_trigger_event, context);
if (close(ip->fd) < 0)
msg_warn("%s: close %s: %m", myname, ip->service);
myfree(ip->service);
myfree((void *) ip);
}
/* inet_trigger - wakeup INET-domain server */
int inet_trigger(const char *service, const char *buf, ssize_t len, int timeout)
{
const char *myname = "inet_trigger";
struct inet_trigger *ip;
int fd;
if (msg_verbose > 1)
msg_info("%s: service %s", myname, service);
/*
* Connect...
*/
if ((fd = inet_connect(service, BLOCKING, timeout)) < 0) {
if (msg_verbose)
msg_warn("%s: connect to %s: %m", myname, service);
return (-1);
}
close_on_exec(fd, CLOSE_ON_EXEC);
ip = (struct inet_trigger *) mymalloc(sizeof(*ip));
ip->fd = fd;
ip->service = mystrdup(service);
/*
* Write the request...
*/
if (write_buf(fd, buf, len, timeout) < 0
|| write_buf(fd, "", 1, timeout) < 0)
if (msg_verbose)
msg_warn("%s: write to %s: %m", myname, service);
/*
* Wakeup when the peer disconnects, or when we lose patience.
*/
if (timeout > 0)
event_request_timer(inet_trigger_event, (void *) ip, timeout + 100);
event_enable_read(fd, inet_trigger_event, (void *) ip);
return (0);
}
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