123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
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/*++
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/* NAME
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/* mail_connect 3
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/* SUMMARY
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/* intra-mail system connection management
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/* SYNOPSIS
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/* #include <mail_proto.h>
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/*
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/* VSTREAM *mail_connect(class, name, block_mode)
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/* const char *class;
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/* const char *name;
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/* int block_mode;
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/*
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/* VSTREAM *mail_connect_wait(class, name)
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/* const char *class;
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/* const char *name;
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/* DESCRIPTION
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/* This module does low-level connection management for intra-mail
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/* communication. All reads and writes are subject to a time limit
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/* (controlled by the global variable \fIvar_ipc_timeout\fR). This
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/* protects against deadlock conditions that should never happen.
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/*
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/* mail_connect() attempts to connect to the UNIX-domain socket of
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/* the named subsystem. The result is a null pointer in case of failure.
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/*
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/* mail_connect_wait() is like mail_connect(), but keeps trying until
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/* the connection succeeds. However, mail_connect_wait() terminates
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/* with a fatal error when the service is down. This is to ensure that
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/* processes terminate when the mail system shuts down.
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/*
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/* Arguments:
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/* .IP class
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/* Name of a class of local transport channel endpoints,
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/* either \fIpublic\fR (accessible by any local user) or
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/* \fIprivate\fR (administrative access only).
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/* .IP service
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/* The name of a local transport endpoint within the named class.
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/* .IP block_mode
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/* NON_BLOCKING for a non-blocking connection, or BLOCKING.
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/* SEE ALSO
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/* timed_ipc(3), enforce IPC timeouts.
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include <sys_defs.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <errno.h>
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/* Utility library. */
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#include <msg.h>
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#include <vstream.h>
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#include <connect.h>
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#include <mymalloc.h>
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#include <iostuff.h>
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/* Global library. */
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#include "timed_ipc.h"
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#include "mail_proto.h"
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/* mail_connect - connect to mail subsystem */
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VSTREAM *mail_connect(const char *class, const char *name, int block_mode)
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{
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char *path;
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VSTREAM *stream;
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int fd;
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path = mail_pathname(class, name);
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if ((fd = LOCAL_CONNECT(path, block_mode, 0)) < 0) {
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if (msg_verbose)
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msg_info("connect to subsystem %s: %m", path);
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stream = 0;
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} else {
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if (msg_verbose)
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msg_info("connect to subsystem %s", path);
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stream = vstream_fdopen(fd, O_RDWR);
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timed_ipc_setup(stream);
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vstream_control(stream,
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VSTREAM_CTL_PATH, path,
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VSTREAM_CTL_END);
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}
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myfree(path);
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return (stream);
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}
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/* mail_connect_wait - connect to mail service until it succeeds */
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VSTREAM *mail_connect_wait(const char *class, const char *name)
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{
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VSTREAM *stream;
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int count = 0;
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/*
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* XXX Solaris workaround for ECONNREFUSED on a busy socket.
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*/
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while ((stream = mail_connect(class, name, BLOCKING)) == 0) {
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if (count++ >= 10) {
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msg_fatal("connect #%d to subsystem %s/%s: %m",
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count, class, name);
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} else {
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msg_warn("connect #%d to subsystem %s/%s: %m",
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count, class, name);
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}
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sleep(10); /* XXX make configurable */
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}
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return (stream);
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}
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