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#!/usr/bin/python
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#
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# Ctrl-Z Test: Start a shell, run a program,
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# send SIGTSTP, wait for status msg, move in
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# foreground, then send SIGINT, then exit
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#
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# Requires use of the following commands:
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#
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# ctrl-z control, fg, sleep
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#
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import sys, imp, atexit
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sys.path.append("/home/courses/cs3214/software/pexpect-dpty/");
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import pexpect, proc_check, shellio, signal, time, threading
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#Ensure the shell process is terminated
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def force_shell_termination(shell_process):
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c.close(force=True)
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# pulling in the regular expression and other definitions
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definitions_scriptname = sys.argv[1]
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def_module = imp.load_source('', definitions_scriptname)
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logfile = None
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if hasattr(def_module, 'logfile'):
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logfile = def_module.logfile
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# spawn an instance of the shell
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c = pexpect.spawn(def_module.shell, drainpty=True, logfile=logfile)
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atexit.register(force_shell_termination, shell_process=c)
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# set timeout for all following 'expect*' calls to 2 seconds
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c.timeout = 2
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# ensure that shell prints expected prompt
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assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"
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# run a command
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c.sendline("sleep 60")
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# The following call is necessary to ensure that the SIGTSTP
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# we are sending below via 'sendcontrol' reaches the 'sleep' child.
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# This is NOT a bullet-proof fix, you may fail on occasion!
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time.sleep(1)
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#checks the number of active child processes
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#using a timeout based process count
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proc_check.count_children_timeout(c, 1, 1)
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#checks the number of active child processes
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#at this moment in time
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proc_check.count_active_children(c, 1)
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# send SIGTSTP to 'sleep'
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c.sendcontrol('z')
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# shell should pick up that 'sleep' was stopped and respond with job status
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# it should output a line such [6]+ Stopped sleep 60
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(jobid, statusmsg, cmdline) = \
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shellio.parse_regular_expression(c, def_module.job_status_regex)
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assert statusmsg == def_module.jobs_status_msg['stopped'], "Shell did not report stopped job"
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# move job into foreground
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c.sendline(def_module.builtin_commands['fg'] % jobid)
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# when moving a job in the foreground, bash outputs its command line
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assert c.expect_exact(cmdline) == 0, "Shell did not move job in foreground"
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# send SIGINT
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c.sendintr()
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#check that the prompt prints
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assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt"
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#exit
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c.sendline("exit")
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assert c.expect_exact("exit\r\n") == 0, "Shell output extraneous characters"
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shellio.success()
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