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/* wakeup UNIX-domain file descriptor listener
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/* #include <trigger.h>
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/* int upass_trigger(service, buf, len, timeout)
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/* const char *service;
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/* upass_trigger() wakes up the named UNIX-domain server by sending
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/* a brief connection to it and writing the named buffer.
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/* The connection is closed by a background thread. Some kernels
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/* cannot handle client-side disconnect before the server has
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/* received the message.
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/* Name of the communication endpoint.
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/* Address of data to be written.
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/* Amount of data to be written.
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/* Deadline in seconds. Specify a value <= 0 to disable
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/* The result is zero in case of success, -1 in case of problems.
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/* upass_connect(3), UNIX-domain client
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/* The Secure Mailer license must be distributed with this software.
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/* IBM T.J. Watson Research
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/* Yorktown Heights, NY 10598, USA
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#include <sys/socket.h>
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/* Utility library. */
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struct upass_trigger {
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/* upass_trigger_event - disconnect from peer */
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static void upass_trigger_event(int event, char *context)
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struct upass_trigger *up = (struct upass_trigger *) context;
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static const char *myname = "upass_trigger_event";
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if (event == EVENT_TIME)
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msg_warn("%s: read timeout for service %s", myname, up->service);
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event_disable_readwrite(up->fd);
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event_cancel_timer(upass_trigger_event, context);
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if (close(up->fd) < 0)
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msg_warn("%s: close %s: %m", myname, up->service);
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/* upass_trigger - wakeup UNIX-domain server */
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int upass_trigger(const char *service, const char *buf, ssize_t len, int timeout)
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const char *myname = "upass_trigger";
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struct upass_trigger *up;
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msg_info("%s: service %s", myname, service);
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if ((fd = upass_connect(service, BLOCKING, timeout)) < 0) {
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msg_warn("%s: connect to %s: %m", myname, service);
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close_on_exec(fd, CLOSE_ON_EXEC);
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* Stash away context.
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up = (struct upass_trigger *) mymalloc(sizeof(*up));
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up->service = mystrdup(service);
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* Write the request...
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if (write_buf(fd, buf, len, timeout) < 0
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|| write_buf(fd, "", 1, timeout) < 0)
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msg_warn("%s: write to %s: %m", myname, service);
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* Wakeup when the peer disconnects, or when we lose patience.
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event_request_timer(upass_trigger_event, (char *) up, timeout + 100);
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event_enable_read(fd, upass_trigger_event, (char *) up);