# # 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, pexpect, proc_check, signal, time, threading from testutils import * console = setup_tests() # ensure that shell prints expected prompt expect_prompt() # run a command sendline("sleep 60") # 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(console) # send SIGTSTP to 'sleep' sendcontrol('z') # shell should pick up that 'sleep' was stopped and respond with job status # it should output a line such [6]+ Stopped sleep 60 (jobid, status, cmdline) = parse_job_line() assert status == 'stopped', "Shell did not report stopped job" # move job into foreground run_builtin('fg', jobid) # when moving a job in the foreground, bash outputs its command line expect_exact(cmdline, "Shell did not report the job moved into the foreground") # end the program sendintr() # run a command sendline("sleep 30 &") #snag the jobid and pid of the sleep command (jobid, pid) = parse_bg_status() #check the prompt prints expect_prompt("Shell did not print expected prompt (2)") #resume the sleep command run_builtin('fg', jobid) #wait until it takes over the foreground process group proc_check.wait_until_child_is_in_foreground(console) #send the command back to the background sendcontrol('z') #check the prompt prints expect_prompt("Shell did not print expected prompt (3)") #run a command to the background sendline("sleep 300 &") #snag the jobid and pid of the second sleep command (jobid2, pid2) = parse_bg_status() #check the prompt prints expect_prompt("Shell did not print expected prompt (4)") #resume the command by its jobid run_builtin('fg', jobid) #wait until it takes over the foreground process group proc_check.wait_until_child_is_in_foreground(console) #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 sendcontrol('z') #check the prompt prints expect_prompt("Shell did not print expected prompt (5)") #resume the command by its jobid run_builtin('fg', jobid2) #wait until it takes over the foreground process group proc_check.wait_until_child_is_in_foreground(console) #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 sendintr() #check that the prompt prints expect_prompt("Shell did not print expected prompt (6)") #resume the first sleep command run_builtin('fg', jobid) #wait until the process takes over the foreground process group proc_check.wait_until_child_is_in_foreground(console) #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 sendline("exit"); expect_exact("exit\r\n", "Shell output extraneous characters") test_success()