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/* wakeup UNIX-domain file descriptor listener
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/* #include <trigger.h>
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/* int unix_pass_trigger(service, buf, len, timeout)
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/* const char *service;
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/* unix_pass_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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/* unix_pass_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 unix_pass_trigger {
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/* unix_pass_trigger_event - disconnect from peer */
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static void unix_pass_trigger_event(int event, char *context)
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struct unix_pass_trigger *up = (struct unix_pass_trigger *) context;
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static const char *myname = "unix_pass_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(unix_pass_trigger_event, context);
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/* Don't combine multiple close() calls into one boolean expression. */
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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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if (close(up->pair[0]) < 0)
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msg_warn("%s: close pipe: %m", myname);
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if (close(up->pair[1]) < 0)
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msg_warn("%s: close pipe: %m", myname);
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/* unix_pass_trigger - wakeup UNIX-domain server */
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int unix_pass_trigger(const char *service, const char *buf, ssize_t len, int timeout)
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const char *myname = "unix_pass_trigger";
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struct unix_pass_trigger *up;
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msg_info("%s: service %s", myname, service);
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if ((fd = unix_pass_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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* Create a pipe, and send one pipe end to the server.
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msg_fatal("%s: pipe: %m", myname);
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close_on_exec(pair[0], CLOSE_ON_EXEC);
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close_on_exec(pair[1], CLOSE_ON_EXEC);
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if (unix_send_fd(fd, pair[0]) < 0)
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msg_fatal("%s: send file descriptor: %m", myname);
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* Stash away context.
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up = (struct unix_pass_trigger *) mymalloc(sizeof(*up));
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up->service = mystrdup(service);
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up->pair[0] = pair[0];
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up->pair[1] = pair[1];
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* Write the request...
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if (write_buf(pair[1], buf, len, timeout) < 0
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|| write_buf(pair[1], "", 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(unix_pass_trigger_event, (char *) up, timeout + 100);
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event_enable_read(fd, unix_pass_trigger_event, (char *) up);