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#!/usr/bin/python
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#
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# fg_test: tests the fg command
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#
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# Test the fg command for bringing a command back to the foreground.
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# Requires the following commands to be implemented
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# or otherwise usable:
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#
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# fg, sleep, ctrl-c control, ctrl-z control
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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, shellio, signal, time, os, re, proc_check
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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 (1)"
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# run a command
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c.sendline("sleep 30 &")
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#snag the jobid and pid of the sleep command
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(jobid, pid) = shellio.parse_regular_expression(c, def_module.bgjob_regex)
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#check the prompt prints
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assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (2)"
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#resume the sleep command
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c.sendline(def_module.builtin_commands['fg'] % jobid)
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#wait until it takes over the foreground process group
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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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#send the command back to the background
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c.sendcontrol('z')
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#check the prompt prints
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assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (3)"
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#run a command to the background
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c.sendline("sleep 300 &")
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#snag the jobid and pid of the second sleep command
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(jobid2, pid2) = shellio.parse_regular_expression(c, def_module.bgjob_regex)
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#check the prompt prints
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assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (4)"
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#resume the command by its jobid
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c.sendline(def_module.builtin_commands['fg'] % jobid)
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#wait until it takes over the foreground process group
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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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#Ensure that the sleep is in the foreground process group via /proc/
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#assert proc_check.check_pid_fgpgrp(pid), "Error, the pid's process group is \
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# not the foreground process group"
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#send the command back to the background
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c.sendcontrol('z')
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#check the prompt prints
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assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (5)"
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#resume the command by its jobid
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c.sendline(def_module.builtin_commands['fg'] % jobid2)
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#wait until it takes over the foreground process group
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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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#Ensure that the sleep is in the foreground process group via /proc/
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#assert proc_check.check_pid_fgpgrp(pid2), "Error, the pid's process group is \
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# not the foreground process group"
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#end the process
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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 (6)"
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#resume the first sleep command
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c.sendline(def_module.builtin_commands['fg'] % jobid)
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#wait until the process takes over the foreground process group
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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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#Ensure that the sleep is in the foreground process group via /proc/
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#assert proc_check.check_pid_fgpgrp(pid), "Error, the pid's process group is \
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# not the foreground process group"
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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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