serial.c

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		memcpy(p, buf, tmplen);
		p += tmplen;
		strcat(p, "\n");
		p++;
		p[0] = 0;
	}
	
	if (buf[0] == EOS ) {
		ha_free(msgstring);
		return NULL;
	}else{
		thissp->consecutive_errors=0;
	}
	
	
	*lenp = len;
	
	/*
	PILCallLog(LOG, PIL_INFO, "final msgstring=%s", msgstring);
	*/
	
	return(msgstring);	
}

/* This function does all the writing to our tty ports */

static int
serial_write(struct hb_media* mp, void *p, int len)
{

	int			string_startlen = sizeof(MSG_START)-1;
	int			netstring_startlen = sizeof(MSG_START_NETSTRING) - 1;

	char			*str;
	int			str_new = 0;
	int			wrc;
	int			size;
	int			ourtty;
	static gboolean		warnyet=FALSE;
	static longclock_t	warninterval;
	static longclock_t	lastwarn;
	

	if (strncmp(p, MSG_START, string_startlen) == 0) {
		str = p;
		size = strlen(str);
		if(size > len){
			return(HA_FAIL);
		}
	} else if(strncmp(p, MSG_START_NETSTRING, netstring_startlen) == 0) {
		
		struct ha_msg * msg;
		
		msg = wirefmt2msg(p, len);
		if(!msg){
			ha_log(PIL_WARN, "serial_write(): wirefmt2msg() failed");
			return(HA_FAIL);
		}
		
		add_msg_auth(msg);
		str = msg2string(msg);		
		str_new = 1;
		size = strlen(str);
		ha_msg_del(msg);
		
	} else{
		return(HA_FAIL);
	}


	TTYASSERT(mp);
	

	if (!warnyet) {
		warninterval = msto_longclock(RTS_WARNTIME*1000L);
	}
	ourmedia = mp;	/* Only used for the "localdie" function */
	OurImports->RegisterCleanup(serial_localdie);
	ourtty = ((struct serial_private*)(mp->pd))->ttyfd;

	if (DEBUGPKT) {
		PILCallLog(LOG, PIL_DEBUG, "Sending pkt to %s [%d bytes]"
		,	mp->name, size);
	}
	if (DEBUGPKTCONT) {
		PILCallLog(LOG, PIL_DEBUG, "%s", str);
	}
	setmsalarm(500);
	wrc = write(ourtty, str, size);
	cancelmstimer();
	if (DEBUGPKTCONT) {
		PILCallLog(LOG, PIL_DEBUG, "serial write returned %d", wrc);
	}
	
	if (wrc < 0 || wrc != size) {
		if (DEBUGPKTCONT && wrc < 0) {
			PILCallLog(LOG, PIL_DEBUG, "serial write errno was %d", errno);
		}
		if (wrc > 0 || (wrc < 0 && errno == EINTR)) {
			longclock_t	now = time_longclock();
			tcflush(ourtty, TCIOFLUSH);

			if (!warnyet
			||	cmp_longclock(sub_longclock(now, lastwarn)
			,		warninterval) >= 0) {

				lastwarn = now;
				warnyet = TRUE;
				PILCallLog(LOG, PIL_WARN
				,	"TTY write timeout on [%s]"
				" (no connection or bad cable"
				"? [see documentation])"
				,	mp->name);
			}
		}else{
			PILCallLog(LOG, PIL_CRIT, "TTY write failure on [%s]: %s"
			    ,	mp->name, strerror(errno));
		}
	}
	
	if(str_new){
		ha_free(str);
		str = NULL;
	}
	return(HA_OK);
}


/* Gets function for our tty */
static char *
ttygets(char * inbuf, int length, struct serial_private *tty)
{
	char *	cp;
	char *	end = inbuf + length;
	int	rc;
	int	fd = tty->ttyfd;

	for(cp=inbuf; cp < end; ++cp) {
		int saverr;
		errno = 0;
		/* One read per char -- yecch  (but it's easy) */
		rc = read(fd, cp, 1);
		saverr = errno;
		OurImports->CheckForEvents();
		errno = saverr;
		if (rc != 1) {
			if (rc == 0 || errno == EINTR) {
				PILCallLog(LOG, PIL_CRIT, "EOF in ttygets [%s]: %s [%d]"
				,	tty->ttyname, strerror(errno), rc);
				++tty->consecutive_errors;
				tcsetpgrp(fd, getsid(getpid()));
				if ((tty->consecutive_errors % 10) == 0) {
					PILCallLog(LOG, PIL_WARN
					,	"10 consecutive EOF"
					" errors from serial port %s"
					,	tty->ttyname);
					PILCallLog(LOG, PIL_INFO
					,	"%s pgrp: %d", tty->ttyname
					,	tcgetpgrp(fd));
					sleep(10);
				}
				return(NULL);
			}
			errno = 0;
			continue;
		}else{
			tty->consecutive_errors = 0;
		}
			
		if (*cp == '\r' || *cp == '\n') {
			break;
		}
	}
	*cp = '\0';
	return(inbuf);
}
/*
 * $Log: serial.c,v $
 * Revision 1.38  2004/10/24 13:00:13  lge
 * -pedantic-errors fixes 2:
 *  * error: ISO C forbids forward references to 'enum' types
 *    error: comma at end of enumerator list
 *    error: ISO C does not allow extra ';' outside of a function
 *
 * Revision 1.37  2004/10/06 10:55:17  lars
 * - Define PIL_PLUGIN_BOILERPLATE() as it used to be, which implies a
 *   prototype for the closepi function.
 * - Define PIL_PLUGIN_BOILERPLATE2() which just takes two arguments and
 *   fills in NULL for all those plugins which don't use the closepi()
 *   functionality.
 *
 * Revision 1.36  2004/06/18 03:06:42  alan
 * Fixed some format items to match their format strings.
 *
 * Revision 1.35  2004/05/12 01:42:44  alan
 * Changed the tty write timeout back to a warning...
 *
 * Revision 1.34  2004/05/11 22:04:35  alan
 * Changed all the HBcomm plugins to use PILCallLog() for logging instead of calling
 * the function pointer directly.
 * Also, in the process fixed several mismatches between arguments and format strings, and
 * a couple of format string vulnerabilities.
 *
 * Revision 1.33  2004/04/29 16:24:34  msoffen
 * fixed comment in Log
 *
 * Revision 1.32  2004/04/29 16:23:16  msoffen
 * Changed // comments to / * * / comments.
 *
 * Revision 1.31  2004/03/03 05:31:51  alan
 * Put in Gochun Shi's new netstrings on-the-wire data format code.
 * this allows sending binary data, among many other things!
 *
 * Revision 1.30  2004/02/17 22:11:59  lars
 * Pet peeve removal: _Id et al now gone, replaced with consistent Id header.
 *
 * Revision 1.29  2004/01/21 11:34:15  horms
 * - Replaced numerous malloc + strcpy/strncpy invocations with strdup
 *   * This usually makes the code a bit cleaner
 *   * Also is easier not to make code with potential buffer over-runs
 * - Added STRDUP to pils modules
 * - Removed some spurious MALLOC and FREE redefinitions
 *   _that could never be used_
 * - Make sure the return value of strdup is honoured in error conditions
 *
 * Revision 1.28  2004/01/20 16:23:11  alan
 * Fixed an oversight which turns out to have been luckily-benign in practice.
 *
 * Revision 1.27  2003/05/21 21:56:50  alan
 * Minor tweak to the last tty fix from Carson Gaspar.
 *
 * Revision 1.26  2003/05/21 21:55:07  alan
 * Put in a bug fix from Carson Gaspar <[e-mail]> to open our
 * serial ttys with O_NOCTTY to avoid having them become our controlling
 * ttys.
 *
 * Revision 1.25  2003/04/15 23:09:52  alan
 * Continuing saga of the semi-major heartbeat process restructure.
 *
 * Revision 1.24  2003/02/07 08:37:18  horms
 * Removed inclusion of portability.h from .h files
 * so that it does not need to be installed.
 *
 * Revision 1.23  2003/02/05 09:06:34  horms
 * Lars put a lot of work into making sure that portability.h
 * is included first, everywhere. However this broke a few
 * things when building against heartbeat headers that
 * have been installed (usually somewhere under /usr/include or
 * /usr/local/include).
 *
 * This patch should resolve this problem without undoing all of
 * Lars's hard work.
 *
 * As an asside: I think that portability.h is a virus that has
 * infected all of heartbeat's code and now must also infect all
 * code that builds against heartbeat. I wish that it didn't need
 * to be included all over the place. Especially in headers to
 * be installed on the system. However, I respect Lars's opinion
 * that this is the best way to resolve some weird build problems
 * in the current tree.
 *
 * Revision 1.22  2003/01/31 10:02:09  lars
 * Various small code cleanups:
 * - Lots of "signed vs unsigned" comparison fixes
 * - time_t globally replaced with TIME_T
 * - All seqnos moved to "seqno_t", which defaults to unsigned long
 * - DIMOF() definition centralized to portability.h and typecast to int
 * - EOS define moved to portability.h
 * - dropped inclusion of signal.h from stonith.h, so that sigignore is
 *   properly defined
 *
 * Revision 1.21  2002/10/22 17:41:58  alan
 * Added some documentation about deadtime, etc.
 * Switched one of the sets of FIFOs to IPC channels.
 * Added msg_from_IPC to ha_msg.c make that easier.
 * Fixed a few compile errors that were introduced earlier.
 * Moved hb_api_core.h out of the global include directory,
 * and back into a local directory.  I also make sure it doesn't get
 * installed.  This *shouldn't* cause problems.
 * Added a ipc_waitin() function to the IPC code to allow you to wait for
 * input synchronously if you really want to.
 * Changes the STONITH test to default to enabled.
 *
 * Revision 1.20  2002/10/18 07:16:10  alan
 * Put in Horms big patch plus a patch for the apcmastersnmp code where
 * a macro named MIN returned the MAX instead.  The code actually wanted
 * the MAX, so when the #define for MIN was surrounded by a #ifndef, then
 * it no longer worked...  This fix courtesy of Martin Bene.
 * There was also a missing #include needed on older Linux systems.
 *
 * Revision 1.19  2002/06/16 06:11:26  alan
 * Put in a couple of changes to the PILS interfaces
 *  - exported license information (name, URL)
 *  - imported malloc/free
 *
 * Revision 1.18  2002/04/24 12:11:40  alan
 * updated the copyright date.
 *
 * Revision 1.17  2002/04/13 22:35:08  alan
 * Changed ha_msg_add_nv to take an end pointer to make it safer.
 * Added a length parameter to string2msg so it would be safer.
 * Changed the various networking plugins to use the new string2msg().
 *
 * Revision 1.16  2002/04/09 21:53:27  alan
 * A large number of minor cleanups related to exit, cleanup, and process
 * management.  It all looks reasonably good.
 * One or two slightly larger changes (but still not major changes) in
 * these same areas.
 * Basically, now we wait for everything to be done before we exit, etc.
 *
 * Revision 1.15  2002/04/09 12:45:36  alan
 * Put in changes to the bcast, mcast and serial code such that
 * interrupted system calls in reads are ignored.
 *
 * Revision 1.14  2002/04/04 09:21:59  lars
 * Make the serial code also report a bad cable as the likely cause of the error.
 * (Most common mistake on the lists so far)
 *
 * Revision 1.13  2002/02/10 22:50:39  alan
 * Added a bit to the serial code to limit the number of messages which
 * come out (and the workload on the machine) when the serial port goes
 * nuts.
 *
 * Revision 1.12  2001/10/25 14:34:17  alan
 * Changed the serial code to send a BREAK when one side first starts up their
 * conversation.
 * Configured the receiving code to flush I/O buffers when they receive a break
 * Configured the code to ignore SIGINTs (except for their buffer flush effect)
 * Configured the code to use SIGQUIT instead of SIGINT when communicating that
 * the shutdown resource giveup is complete.
 *
 * This is all to fix a bug which occurs because of leftover out-of-date messages
 * in the serial buffering system.
 *
 * Revision 1.11  2001/10/04 21:14:30  alan
 * Patch from Reza Arbab <[e-mail]> to make it compile correctly
 * on AIX.
 *
 * Revision 1.10  2001/10/03 05:22:19  alan
 * Added code to save configuration parameters so we can pass them to the various communication plugins...
 *
 * Revision 1.9  2001/10/02 22:31:33  alan
 * Fixed really dumb error in the serial code.  I called an init function *after*
 * returning from the function ;-)
 *
 * Revision 1.8  2001/10/02 21:57:19  alan
 * Added debugging to the tty code.
 *
 * Revision 1.7  2001/10/02 20:15:41  alan
 * Debug code, etc. from Matt Soffen...
 *
 * Revision 1.6  2001/10/02 05:12:19  alan
 * Various portability fixes (make warnings go away) for Solaris.
 *
 * Revision 1.5  2001/09/27 17:02:34  alan
 * Shortened alarm time in write in serial.c
 * Put in a handful of Solaris warning-elimination patches.
 *
 * Revision 1.4  2001/09/07 16:18:17  alan
 * Updated ping.c to conform to the new plugin loading system.
 * Changed log messages in bcast, mcast, ping and serial to use the
 * new logging function.
 *
 * Revision 1.3  2001/08/15 16:56:47  alan
 * Put in the code to allow serial port comm plugins to work...
 *
 * Revision 1.2  2001/08/15 16:17:12  alan
 * Fixed the code so that serial comm plugins build/load/work.
 *
 * Revision 1.1  2001/08/10 17:16:44  alan
 * New code for the new plugin loading system.
 *
 * Revision 1.27  2001/06/08 04:57:48  alan
 * Changed "config.h" to <portability.h>
 *
 * Revision 1.26  2001/05/31 15:51:08  alan
 * Put in more fixes to get module loading (closer to) working...
 *
 * Revision 1.25  2001/05/26 17:38:01  mmoerz
 * *.cvsignore: added automake generated files that were formerly located in
 * 	     config/
 * * Makefile.am: removed ac_aux_dir stuff (for libtool) and added libltdl
 * * configure.in: removed ac_aux_dir stuff (for libtool) and added libltdl as
 * 		a convenience library
 * * bootstrap: added libtools libltdl support
 * * heartbeat/Makefile.am: added some headerfile to noinst_HEADERS
 * * heartbeat/heartbeat.c: changed dlopen, dlclose to lt_dlopen, lt_dlclose
 * * heartbeat/crc.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/mcast.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/md5.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/ping.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/serial.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/sha1.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/udp.c: changed to libltdl, exports functions via EXPORT()
 * * heartbeat/hb_module.h: added EXPORT() Macro, changed to libtools function
 * 			pointer
 * * heartbeat/module.c: converted to libtool (dlopen/dlclose -> lt_dlopen/...)
 * 		      exchanged scandir with opendir, readdir. enhanced
 * 		      autoloading code so that only .la modules get loaded.
 *
 * Revision 1.24  2001/05/12 06:05:23  alan
 * Put in the latest portability fixes (aka autoconf fixes)
 *
 * Revision 1.23  2001/05/11 06:20:26  alan
 * Fixed CFLAGS so we load modules from the right diurectory.
 * Fixed minor static symbol problems.
 * Fixed a bug which kept early error messages from coming out.
 *
 * Revision 1.22  2001/05/10 22:36:37  alan
 * Deleted Makefiles from CVS and made all the warnings go away.
 *
 * Revision 1.21  2000/12/12 23:23:47  alan
 * Changed the type of times from time_t to TIME_T (unsigned long).
 * Added BuildPreReq: lynx
 * Made things a little more OpenBSD compatible.
 *
 * Revision 1.20  2000/12/04 22:16:33  alan
 * Simplfied a BSD compatibility fix.
 *
 * Revision 1.19  2000/12/04 20:33:17  alan
 * OpenBSD fixes from Frank DENIS aka Jedi/Sector One <[e-mail]>
 *
 * Revision 1.18  2000/09/01 21:10:46  marcelo
 * Added dynamic module support
 *
 * Revision 1.17  2000/08/13 04:36:16  alan
 * Added code to make ping heartbeats work...
 * It looks like they do, too ;-)
 *
 * Revision 1.16  2000/08/04 03:45:56  alan
 * Moved locking code into lock.c, so it could be used by both heartbeat and
 * the client code.  Also restructured it slightly...
 *
 * Revision 1.15  2000/07/26 05:17:19  alan
 * Added GPL license statements to all the code.
 *
 * Revision 1.14  2000/05/17 13:39:55  alan
 * Added the close-on-exec flag to sockets and tty fds that we open.
 * Thanks to Christoph J鋑er for noticing the problem.
 *
 * Revision 1.13  2000/04/27 13:24:34  alan
 * Added comments about lock file fix. Minor corresponding code changes.
 *
 * Revision 1.12  2000/04/11 22:12:22  horms
 * Now cleans locks on serial devices from dead processes succesfully
 *
 * Revision 1.11  2000/02/23 18:44:53  alan
 * Put in a bug fix from Cliff Liang <[e-mail]> to fix the tty
 * locking code.  The parameters to sscanf were mixed up.
 *
 * Revision 1.10  1999/11/15 05:31:43  alan
 * More tweaks for CTS/RTS flow control.
 *
 * Revision 1.9  1999/11/14 08:23:44  alan
 * Fixed bug in serial code where turning on flow control caused
 * heartbeat to hang.  Also now detect hangs and shutdown automatically.
 *
 * Revision 1.8  1999/11/11 04:58:04  alan
 * Fixed a problem in the Makefile which caused resources to not be
 * taken over when we start up.
 * Added RTSCTS to the serial port.
 * Added lots of error checking to the resource takeover code.
 *
 * Revision 1.7  1999/11/07 20:57:21  alan
 * Put in Matt Soffen's latest FreeBSD patch...
 *
 * Revision 1.6  1999/10/25 15:35:03  alan
 * Added code to move a little ways along the path to having error recovery
 * in the heartbeat protocol.
 * Changed the code for serial.c and ppp-udp.c so that they reauthenticate
 * packets they change the ttl on (before forwarding them).
 *
 * Revision 1.5  1999/10/10 20:12:54  alanr
 * New malloc/free (untested)
 *
 * Revision 1.4  1999/10/05 06:17:30  alanr
 * Fixed various uninitialized variables
 *
 * Revision 1.3  1999/09/30 15:55:12  alanr
 *
 * Added Matt Soffen's fix to change devname to serial_device for some kind
 * of FreeBSD compatibility.
 *
 * Revision 1.2  1999/09/26 14:01:18  alanr
 * Added Mijta's code for authentication and Guenther Thomsen's code for serial locking and syslog reform
 *
 * Revision 1.1.1.1  1999/09/23 15:31:24  alanr
 * High-Availability Linux
 *
 * Revision 1.11  1999/09/18 02:56:36  alanr
 * Put in Matt Soffen's portability changes...
 *
 * Revision 1.10  1999/09/16 05:50:20  alanr
 * Getting ready for 0.4.3...
 *
 * Revision 1.9  1999/08/17 03:49:26  alanr
 * added log entry to bottom of file.
 *
 */