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#!/usr/bin/python |
# |
# fg_test: tests the fg command |
# |
# Test the fg command for bringing a command back to the foreground. |
# Requires the following commands to be implemented |
# or otherwise usable: |
# |
# fg, sleep, ctrl-c control, ctrl-z control |
# |
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import sys, imp, atexit |
sys.path.append("/home/courses/cs3214/software/pexpect-dpty/"); |
import pexpect, shellio, signal, time, os, re, proc_check |
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#Ensure the shell process is terminated |
def force_shell_termination(shell_process): |
c.close(force=True) |
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#pulling in the regular expression and other definitions |
definitions_scriptname = sys.argv[1] |
def_module = imp.load_source('', definitions_scriptname) |
logfile = None |
if hasattr(def_module, 'logfile'): |
logfile = def_module.logfile |
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# spawn an instance of the shell |
c = pexpect.spawn(def_module.shell, drainpty=True, logfile=logfile) |
atexit.register(force_shell_termination, shell_process=c) |
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# set timeout for all following 'expect*' calls to 2 seconds |
c.timeout = 2 |
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# ensure that shell prints expected prompt |
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (1)" |
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# run a command |
c.sendline("sleep 60") |
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# The following call is necessary to ensure that the SIGTSTP |
# we are sending below via 'sendcontrol' reaches the 'sleep' child. |
proc_check.wait_until_child_is_in_foreground(c) |
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# send SIGTSTP to 'sleep' |
c.sendcontrol('z') |
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# shell should pick up that 'sleep' was stopped and respond with job status |
# it should output a line such [6]+ Stopped sleep 60 |
(jobid, statusmsg, cmdline) = \ |
shellio.parse_regular_expression(c, def_module.job_status_regex) |
assert statusmsg == def_module.jobs_status_msg['stopped'], "Shell did not report stopped job" |
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# move job into foreground |
c.sendline(def_module.builtin_commands['fg'] % jobid) |
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# when moving a job in the foreground, bash outputs its command line |
assert c.expect_exact(cmdline) == 0, "Shell did not report the job moved into the foreground" |
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# end the program |
c.sendintr() |
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# run a command |
c.sendline("sleep 30 &") |
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#snag the jobid and pid of the sleep command |
(jobid, pid) = shellio.parse_regular_expression(c, def_module.bgjob_regex) |
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#check the prompt prints |
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (2)" |
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#resume the sleep command |
c.sendline(def_module.builtin_commands['fg'] % jobid) |
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#wait until it takes over the foreground process group |
proc_check.wait_until_child_is_in_foreground(c) |
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#send the command back to the background |
c.sendcontrol('z') |
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#check the prompt prints |
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (3)" |
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#run a command to the background |
c.sendline("sleep 300 &") |
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#snag the jobid and pid of the second sleep command |
(jobid2, pid2) = shellio.parse_regular_expression(c, def_module.bgjob_regex) |
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#check the prompt prints |
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (4)" |
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#resume the command by its jobid |
c.sendline(def_module.builtin_commands['fg'] % jobid) |
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#wait until it takes over the foreground process group |
proc_check.wait_until_child_is_in_foreground(c) |
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#Ensure that the sleep is in the foreground process group via /proc/ |
assert proc_check.check_pid_fgpgrp(pid), "Error, the pid's process group is \ |
not the foreground process group" |
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#send the command back to the background |
c.sendcontrol('z') |
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#check the prompt prints |
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (5)" |
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#resume the command by its jobid |
c.sendline(def_module.builtin_commands['fg'] % jobid2) |
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#wait until it takes over the foreground process group |
proc_check.wait_until_child_is_in_foreground(c) |
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#Ensure that the sleep is in the foreground process group via /proc/ |
assert proc_check.check_pid_fgpgrp(pid2), "Error, the pid's process group is \ |
not the foreground process group" |
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#end the process |
c.sendintr() |
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#check that the prompt prints |
assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (6)" |
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#resume the first sleep command |
c.sendline(def_module.builtin_commands['fg'] % jobid) |
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#wait until the process takes over the foreground process group |
proc_check.wait_until_child_is_in_foreground(c) |
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#Ensure that the sleep is in the foreground process group via /proc/ |
assert proc_check.check_pid_fgpgrp(pid), "Error, the pid's process group is \ |
not the foreground process group" |
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#exit |
c.sendline("exit"); |
assert c.expect_exact("exit\r\n") == 0, "Shell output extraneous characters" |
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shellio.success() |