#!/bin/csh
#
# $Id: mast-client.txt,v 1.5 2006/01/03 06:37:00 tbailey Exp $
# $Log: mast-client.txt,v $
# Revision 1.5  2006/01/03 06:37:00  tbailey
# Fix "MEME_BINbin" bug in mast-client.txt.
# Fix indentation in meme-server.c and meme-client.c.
#
# Revision 1.4  2005/10/05 06:18:35  nadya
# use full path for "rm". Asssume everybody has /bin/rm.
#
# Revision 1.3  2005/10/02 05:41:17  nadya
# add sourcing file to set all the environment
# use variables when calling real binaries.
#
# Revision 1.2  2005/10/02 05:01:49  nadya
# remove ".csh" from the name. Use extension ".bin" to call a real executable
#
# Revision 1.1.1.1  2005/07/30 02:21:41  nadya
# Importing from meme-3.0.14, and adding configure/make
#
#

# This script was created by the MEME install command
set pgm = $0
set pgm = $pgm:t

#
# set the directories we need and get the machine/OS type
#

# set the environment 
setenv CONF @MEMEDIR@/etc/meme_config.csh
if ( -f $CONF) then
    source $CONF
else
    echo "$CONF does not exist. Meme installation is incomplete"
    exit 1
endif


#
# check for no arguments
#
if ($#argv < 1) then
  usage:
  cat << USAGE
  USAGE:
	mast-client <datafile> [<host> <port>]
	<datafile>		file to send to server
	[<host> <port>]		ping this host on this port

	Pings server on first CPU if <datafile> is "__PING__" and exits with
	status 0 if it is running.  If arguments follow the first argument 
	"__PING__", pings a single host.

USAGE
exit
endif

#
# execute the binary version of the program with the arguments given
# during install and the arguments on the command line
# 
@ i = 1
set args = ""
# protect each argument with single quotes so they won't get lumped
while ($i <= $#argv)
 set a = \'"$argv[$i]"\'
 set args = "$args $a"
 @ i++
end

#
# initialize names of available cpus and port numbers
#
set cpus = (@HOST_NAME@); set sockets = (@MASTPORT@);
set ncpus = $#cpus

#
# initialize semaphore stuff
#
set patience = 10				# wait up to 10 seconds for
set down = $pgm.cpunum.down			# down semaphore file name
set up = $pgm.cpunum.up				# up semaphore file name
						# semaphore
#
# test-and-set a semaphore file containing the next cpu number
# quit after $patience tries to prevent lockout and to create the
# semaphore the first time
#
@ i = 1						# patience counter
loop1:
mv -f $down $up >& /dev/null			# test-and-set
if ($status && $i <= $patience) then		# wait 1 second then loop
  sleep 1					
  @ i++						# bump patience counter
  goto loop1
endif 

#
# get the number of the cpu to use
#
if ($i > $patience) then			# test-and-set failed 
  set cpunum = 1				# use first cpu
else						# test and set succeeded
  @ cpunum = `cat $up`				# get cpu number from semaphore
endif

#
# see if cpu is running server; if not, loop until a living cpu is found or all
# have been tried
#
if ($cpunum > $ncpus) set cpunum = 1		# in case fewer cpus than before
set first = $cpunum
set ping = $pgm.$$.ping.tmp
echo "ping" > $ping
set exe_status = 0
onintr cleanup
while (1)
  set cpu = $cpus[$cpunum]			# name of cpu
  if ($#argv == 3 && $1 == __PING__) then
    set cpus = ($2)
    set sockets = ($3)
    set ncpus = 1
  endif
  # ping the server
  $MEME_BIN/$MEME_CLIENT_EXEC $sockets[$cpunum] $cpus[$cpunum] $ping 1
  set exe_status = $status			# save the status
  if ($1 == __PING__) goto cleanup		# exit if this was a ping
  if ($exe_status == 0) break;			# server is alive

  # server is dead; get next cpu number mod n and loop
  @ cpunum++	 				
  if ($cpunum > $ncpus) @ cpunum = 1
  # check to see if out of cpus to try
  if ($cpunum == $first) then			# tried them all
    mv -f $up $down >& /dev/null		# clear the semaphore
    echo "Sorry. No server is currently running."
    goto cleanup                                # quit
  endif
end

#
# clear the semaphore setting next cpu number to use
#
@ next = $cpunum + 1				# next number
if ($next > $ncpus) @ next = 1			# modulo n 
echo $next >! $up				# store next cpu number
chmod 777 $up					# so I can read it
mv -f $up $down					# clear semaphore

#
# execute the client
#
eval $MEME_BIN/$MEME_CLIENT_EXEC $sockets[$cpunum] $cpus[$cpunum] $args
set exe_status = $status			# save the status

#
# cleanup temporary files
#
cleanup:
if (-e $ping) /bin/rm -f $ping			# delete the ping file
exit $exe_status