| 0,0 → 1,131 |
|---|
| #!/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 |
| # |
| |
| import sys, imp, atexit |
| sys.path.append("/home/courses/cs3214/software/pexpect-dpty/"); |
| import pexpect, shellio, signal, time, os, re, proc_check |
| |
| #Ensure the shell process is terminated |
| def force_shell_termination(shell_process): |
| c.close(force=True) |
| |
| #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 |
| |
| # spawn an instance of the shell |
| c = pexpect.spawn(def_module.shell, drainpty=True, logfile=logfile) |
| atexit.register(force_shell_termination, shell_process=c) |
| |
| # set timeout for all following 'expect*' calls to 2 seconds |
| c.timeout = 2 |
| |
| # ensure that shell prints expected prompt |
| assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (1)" |
| |
| |
| |
| # run a command |
| c.sendline("sleep 30 &") |
| |
| #snag the jobid and pid of the sleep command |
| (jobid, pid) = shellio.parse_regular_expression(c, def_module.bgjob_regex) |
| |
| #check the prompt prints |
| assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (2)" |
| |
| |
| |
| #resume the sleep command |
| c.sendline(def_module.builtin_commands['fg'] % jobid) |
| |
| #wait until it takes over the foreground process group |
| # This is NOT a bullet-proof fix, you may fail on occasion! |
| time.sleep(1) |
| |
| #send the command back to the background |
| c.sendcontrol('z') |
| |
| #check the prompt prints |
| assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (3)" |
| |
| |
| |
| #run a command to the background |
| c.sendline("sleep 300 &") |
| |
| #snag the jobid and pid of the second sleep command |
| (jobid2, pid2) = shellio.parse_regular_expression(c, def_module.bgjob_regex) |
| |
| #check the prompt prints |
| assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (4)" |
| |
| #resume the command by its jobid |
| c.sendline(def_module.builtin_commands['fg'] % jobid) |
| |
| #wait until it takes over the foreground process group |
| # This is NOT a bullet-proof fix, you may fail on occasion! |
| time.sleep(1) |
| |
| #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" |
| |
| #send the command back to the background |
| c.sendcontrol('z') |
| |
| #check the prompt prints |
| assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (5)" |
| |
| |
| |
| #resume the command by its jobid |
| c.sendline(def_module.builtin_commands['fg'] % jobid2) |
| |
| #wait until it takes over the foreground process group |
| # This is NOT a bullet-proof fix, you may fail on occasion! |
| time.sleep(1) |
| |
| #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" |
| |
| #end the process |
| c.sendintr() |
| |
| #check that the prompt prints |
| assert c.expect(def_module.prompt) == 0, "Shell did not print expected prompt (6)" |
| |
| |
| |
| #resume the first sleep command |
| c.sendline(def_module.builtin_commands['fg'] % jobid) |
| |
| #wait until the process takes over the foreground process group |
| # This is NOT a bullet-proof fix, you may fail on occasion! |
| time.sleep(1) |
| |
| |
| #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" |
| |
| |
| |
| #exit |
| c.sendline("exit"); |
| assert c.expect_exact("exit\r\n") == 0, "Shell output extraneous characters" |
| |
| |
| shellio.success() |