#!/usr/bin/python

import os, signal, popen2

def getPID(dir):
    f = open(os.path.join(dir,'info'))
    for ln in f.readlines():
        if ln.startswith('PID: '):
            return int(ln[5:])
    return None

def execCmd(pid, gdbCmd, opts):
    cmd = ("gdb " +
           "--batch " +
           "--pid=%d " +
           "--eval-command=\"%s\" " +
           "--eval-command=detach")%(pid,gdbCmd)
    cout,cin = popen2.popen2(cmd)
    cin.close()
    return cout.read()
    
def main():
    from optparse import OptionParser
    op = OptionParser("usage: %prog <PID | test directory>")
    op.add_option('','--backtrace', dest='backtrace',
                  action='store_true', default=False)
    op.add_option('-s','--stop-forking', dest='stopForking',
                  action='store_true', default=False)
    op.add_option('-H','--halt-execution', dest='haltExecution',
                  action='store_true', default=False)
    op.add_option('-d','--dump-states', dest='dumpStates',
                  action='store_true', default=False)
    op.add_option('-t','--dump-tree', dest='dumpTree',
                  action='store_true', default=False)
    op.add_option('-i','--int', dest='int',
                  action='store_true', default=False)
    op.add_option('-k','--kill', dest='kill',
                  action='store_true', default=False)
    op.add_option('','--print-pid', dest='printPid',
                  action='store_true', default=False)
    op.add_option('','--print-ticks', dest='printTicks',
                  action='store_true', default=False)
    opts,args = op.parse_args()

    if len(args) != 1:
        op.error("invalid arguments")

    try:
        pid = int(args[0])
    except:
        pid = None

    if pid is None:
        try:
            pid = getPID(args[0])
        except:
            pid = None
            
    if pid is None:
        op.error("unable to determine PID (bad pid or test directory)")

    if opts.printPid:
        print pid
        return
    print 'pid: %d'%pid    
    if opts.backtrace:
        execCmd(pid, 'bt', opts)
    if opts.dumpStates:
        execCmd(pid, "p dumpStates = 1", opts)        
    if opts.dumpTree:
        execCmd(pid, "p dumpPTree = 1", opts)        
    if opts.stopForking:
        execCmd(pid, 'p stop_forking()', opts)    
    if opts.haltExecution:
        execCmd(pid, 'p halt_execution()', opts)
    if opts.printTicks:
        res = execCmd(pid, 'p timerTicks', opts)
        lns = res.split('\n')
        for ln in lns:
            if ln.startswith('$1') and '=' in ln:
                print ln.split('=',1)[1].strip()
    if opts.int:    
        os.kill(pid, signal.SIGINT)
    if opts.kill:    
        os.kill(pid, signal.SIGKILL)

if __name__=='__main__':
    main()