Shell Lab file
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# Makefile for the CS:APP Shell Lab
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TEAM = NOBODY
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VERSION = 1
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HANDINDIR = /afs/cs/academic/class/15213-f02/L5/handin
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DRIVER = ./sdriver.pl
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TSH = ./tsh
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TSHREF = ./tshref
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TSHARGS = "-p"
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CC = gcc
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CFLAGS = -Wall -O2
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FILES = $(TSH) ./myspin ./mysplit ./mystop ./myint
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all: $(FILES)
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##################
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# Handin your work
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##################
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handin:
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cp tsh.c $(HANDINDIR)/$(TEAM)-$(VERSION)-tsh.c
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##################
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# Regression tests
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##################
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# Run tests using the student's shell program
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test01:
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$(DRIVER) -t trace01.txt -s $(TSH) -a $(TSHARGS)
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test02:
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$(DRIVER) -t trace02.txt -s $(TSH) -a $(TSHARGS)
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test03:
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$(DRIVER) -t trace03.txt -s $(TSH) -a $(TSHARGS)
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test04:
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$(DRIVER) -t trace04.txt -s $(TSH) -a $(TSHARGS)
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test05:
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$(DRIVER) -t trace05.txt -s $(TSH) -a $(TSHARGS)
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test06:
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$(DRIVER) -t trace06.txt -s $(TSH) -a $(TSHARGS)
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test07:
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$(DRIVER) -t trace07.txt -s $(TSH) -a $(TSHARGS)
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test08:
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$(DRIVER) -t trace08.txt -s $(TSH) -a $(TSHARGS)
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test09:
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$(DRIVER) -t trace09.txt -s $(TSH) -a $(TSHARGS)
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test10:
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$(DRIVER) -t trace10.txt -s $(TSH) -a $(TSHARGS)
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test11:
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$(DRIVER) -t trace11.txt -s $(TSH) -a $(TSHARGS)
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test12:
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$(DRIVER) -t trace12.txt -s $(TSH) -a $(TSHARGS)
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test13:
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$(DRIVER) -t trace13.txt -s $(TSH) -a $(TSHARGS)
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test14:
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$(DRIVER) -t trace14.txt -s $(TSH) -a $(TSHARGS)
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test15:
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$(DRIVER) -t trace15.txt -s $(TSH) -a $(TSHARGS)
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test16:
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$(DRIVER) -t trace16.txt -s $(TSH) -a $(TSHARGS)
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# Run the tests using the reference shell program
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rtest01:
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$(DRIVER) -t trace01.txt -s $(TSHREF) -a $(TSHARGS)
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rtest02:
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$(DRIVER) -t trace02.txt -s $(TSHREF) -a $(TSHARGS)
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rtest03:
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$(DRIVER) -t trace03.txt -s $(TSHREF) -a $(TSHARGS)
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rtest04:
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$(DRIVER) -t trace04.txt -s $(TSHREF) -a $(TSHARGS)
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rtest05:
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$(DRIVER) -t trace05.txt -s $(TSHREF) -a $(TSHARGS)
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rtest06:
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$(DRIVER) -t trace06.txt -s $(TSHREF) -a $(TSHARGS)
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rtest07:
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$(DRIVER) -t trace07.txt -s $(TSHREF) -a $(TSHARGS)
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rtest08:
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$(DRIVER) -t trace08.txt -s $(TSHREF) -a $(TSHARGS)
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rtest09:
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$(DRIVER) -t trace09.txt -s $(TSHREF) -a $(TSHARGS)
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rtest10:
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$(DRIVER) -t trace10.txt -s $(TSHREF) -a $(TSHARGS)
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rtest11:
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$(DRIVER) -t trace11.txt -s $(TSHREF) -a $(TSHARGS)
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rtest12:
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$(DRIVER) -t trace12.txt -s $(TSHREF) -a $(TSHARGS)
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rtest13:
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$(DRIVER) -t trace13.txt -s $(TSHREF) -a $(TSHARGS)
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rtest14:
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$(DRIVER) -t trace14.txt -s $(TSHREF) -a $(TSHARGS)
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rtest15:
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$(DRIVER) -t trace15.txt -s $(TSHREF) -a $(TSHARGS)
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rtest16:
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$(DRIVER) -t trace16.txt -s $(TSHREF) -a $(TSHARGS)
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# clean up
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clean:
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rm -f $(FILES) *.o *~
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################
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CS:APP Shell Lab
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################
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Files:
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Makefile # Compiles your shell program and runs the tests
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README # This file
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tsh.c # The shell program that you will write and hand in
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tshref # The reference shell binary.
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# The remaining files are used to test your shell
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sdriver.pl # The trace-driven shell driver
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trace*.txt # The 15 trace files that control the shell driver
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tshref.out # Example output of the reference shell on all 15 traces
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# Little C programs that are called by the trace files
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myspin.c # Takes argument <n> and spins for <n> seconds
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mysplit.c # Forks a child that spins for <n> seconds
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mystop.c # Spins for <n> seconds and sends SIGTSTP to itself
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myint.c # Spins for <n> seconds and sends SIGINT to itself
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/*
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* myint.c - Another handy routine for testing your tiny shell
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*
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* usage: myint <n>
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* Sleeps for <n> seconds and sends SIGINT to itself.
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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int main(int argc, char **argv)
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{
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int i, secs;
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pid_t pid;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <n>\n", argv[0]);
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exit(0);
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}
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secs = atoi(argv[1]);
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for (i=0; i < secs; i++)
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sleep(1);
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pid = getpid();
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if (kill(pid, SIGINT) < 0)
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fprintf(stderr, "kill (int) error");
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exit(0);
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}
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/*
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* myspin.c - A handy program for testing your tiny shell
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*
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* usage: myspin <n>
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* Sleeps for <n> seconds in 1-second chunks.
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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int main(int argc, char **argv)
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{
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int i, secs;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <n>\n", argv[0]);
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exit(0);
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}
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secs = atoi(argv[1]);
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for (i=0; i < secs; i++)
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sleep(1);
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exit(0);
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}
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/*
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* mysplit.c - Another handy routine for testing your tiny shell
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*
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* usage: mysplit <n>
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* Fork a child that spins for <n> seconds in 1-second chunks.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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int main(int argc, char **argv)
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{
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int i, secs;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <n>\n", argv[0]);
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exit(0);
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}
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secs = atoi(argv[1]);
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if (fork() == 0) { /* child */
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for (i=0; i < secs; i++)
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sleep(1);
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exit(0);
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}
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/* parent waits for child to terminate */
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wait(NULL);
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exit(0);
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}
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/*
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* mystop.c - Another handy routine for testing your tiny shell
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*
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* usage: mystop <n>
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* Sleeps for <n> seconds and sends SIGTSTP to itself.
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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int main(int argc, char **argv)
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{
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int i, secs;
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pid_t pid;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <n>\n", argv[0]);
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exit(0);
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}
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secs = atoi(argv[1]);
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for (i=0; i < secs; i++)
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sleep(1);
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pid = getpid();
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if (kill(-pid, SIGTSTP) < 0)
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fprintf(stderr, "kill (tstp) error");
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exit(0);
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}
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这个实验是大家在本课程第一次体验系统级编程，涉及过程，过程控制和信号的相关知识。
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1.你需要干什么？
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你需要构建一个简单的类Unix/Linux Shell。基于已经提供的“微Shell”框架tsh.c，完成部分函数和信号处理函数的编写工作。使用sdriver.pl可以评估你所完成的shell的相关功能。
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2. 准备工作
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使用命令tar xvf shelab-handout.tar 解压缩文件；
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使用命令 make 去编译和链接一些测试例程；
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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你要实现的重要函数列出如下：
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eval 主例程，用以分析和解释命令行（好消息：该函数原型在教材一第8章8.4节中可以找到！）；
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builtin_cmd 执行bg和fg内置命令；
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waitfg 等待前台作业执行；
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sigchld_handler 响应处理SIGCHILD信号
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sigint_handler 响应处理SIGINT（ctrl-c）信号
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sigtstp_handler 相应处理SIGSTP（ctrl-z）信号
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3.注意
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每次修改了tsh.c文件，都需要make它以重新编译。在你的Linux终端中直接运行tsh（./tsh）就可以进入你所编写完成的tiny shell tsh>了。
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4. 如何证明你完成了这个实验
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在你的Linux终端运行./tshref 这个已经实现的shell，将其输出结果与你所实现的./tsh 输出结果比较，是否一致。
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相关比较命令行，参见shelab-overview文件。
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5.请在实验报告体现你解决本实验目标的详细过程，仅仅贴图（图中只有代码）可能会导致“无个人工作，仅仅是复制粘贴”的极低分判定。
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Love & Peace！
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#!/usr/bin/perl
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#!/usr/local/bin/perl
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use Getopt::Std;
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use FileHandle;
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use IPC::Open2;
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#######################################################################
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# sdriver.pl - Shell driver
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#
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# Copyright (c) 2002, R. Bryant and D. O'Hallaron, All rights reserved.
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# May not be used, modified, or copied without permission.
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#
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# The driver runs a student's shell program as a child, sends
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# commands and signals to the child as directed by a trace file,
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# and captures and displays the output produced by the child.
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#
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# Tracefile format:
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#
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# The tracefile consists of text lines that are either blank lines,
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# comment lines, driver commands, or shell commands. Blank lines are
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# ignored. Comment lines begin with "#" and are echo'd without change
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# to stdout. Driver commands are intepreted by the driver and are not
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# passed to the child shell. All other lines are shell commands and
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# are passed without modification to the shell, which reads them on
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# stdin. Output produced by the child on stdout/stderr is read by
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# the parent and printed on its stdout.
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#
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# Driver commands:
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# TSTP Send a SIGTSTP signal to the child
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# INT Send a SIGINT signal to the child
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# QUIT Send a SIGQUIT signal to the child
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# KILL Send a SIGKILL signal to the child
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# CLOSE Close Writer (sends EOF signal to child)
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# WAIT Wait() for child to terminate
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# SLEEP <n> Sleep for <n> seconds
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#
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######################################################################
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#
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# usage - print help message and terminate
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#
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sub usage
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{
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printf STDERR "$_[0]\n";
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printf STDERR "Usage: $0 [-hv] -t <trace> -s <shellprog> -a <args>\n";
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printf STDERR "Options:\n";
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printf STDERR " -h Print this message\n";
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printf STDERR " -v Be more verbose\n";
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printf STDERR " -t <trace> Trace file\n";
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printf STDERR " -s <shell> Shell program to test\n";
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printf STDERR " -a <args> Shell arguments\n";
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printf STDERR " -g Generate output for autograder\n";
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die "\n" ;
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}
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# Parse the command line arguments
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getopts('hgvt:s:a:');
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if ($opt_h) {
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usage();
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}
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if (!$opt_t) {
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usage("Missing required -t argument");
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}
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if (!$opt_s) {
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usage("Missing required -s argument");
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}
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$verbose = $opt_v;
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$infile = $opt_t;
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$shellprog = $opt_s;
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$shellargs = $opt_a;
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$grade = $opt_g;
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# Make sure the input script exists and is readable
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-e $infile
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or die "$0: ERROR: $infile not found\n";
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-r $infile
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or die "$0: ERROR: $infile is not readable\n";
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# Make sure the shell program exists and is executable
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-e $shellprog
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or die "$0: ERROR: $shellprog not found\n";
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-x $shellprog
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or die "$0: ERROR: $shellprog is not executable\n";
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# Open the input script
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open INFILE, $infile
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or die "$0: ERROR: Couldn't open input file $infile: $!\n";
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#
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# Fork a child, run the shell in it, and connect the parent
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# and child with a pair of unidirectional pipes:
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# parent:Writer -> child:stdin
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# child:stdout -> parent:Reader
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#
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$pid = open2(\*Reader, \*Writer, "$shellprog $shellargs");
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Writer->autoflush();
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# The autograder will want to know the child shell's pid
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if ($grade) {
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print ("pid=$pid\n");
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}
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#
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# Parent reads a trace file, sends commands to the child shell.
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#
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while (<INFILE>) {
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$line = $_;
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chomp($line);
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# Comment line
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if ($line =~ /^#/) {
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print "$line\n";
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}
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# Blank line
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elsif ($line =~ /^\s*$/) {
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if ($verbose) {
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print "$0: Ignoring blank line\n";
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}
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}
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# Send SIGTSTP (ctrl-z)
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elsif ($line =~ /TSTP/) {
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if ($verbose) {
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print "$0: Sending SIGTSTP signal to process $pid\n";
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}
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kill 'TSTP', $pid;
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}
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# Send SIGINT (ctrl-c)
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elsif ($line =~ /INT/) {
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if ($verbose) {
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print "$0: Sending SIGINT signal to process $pid\n";
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}
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kill 'INT', $pid;
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}
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# Send SIGQUIT (whenever we need graceful termination)
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elsif ($line =~ /QUIT/) {
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if ($verbose) {
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print "$0: Sending SIGQUIT signal to process $pid\n";
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}
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kill 'QUIT', $pid;
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}
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# Send SIGKILL
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elsif ($line =~ /KILL/) {
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if ($verbose) {
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print "$0: Sending SIGKILL signal to process $pid\n";
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}
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kill 'KILL', $pid;
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}
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# Close pipe (sends EOF notification to child)
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elsif ($line =~ /CLOSE/) {
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if ($verbose) {
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print "$0: Closing output end of pipe to child $pid\n";
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}
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close Writer;
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}
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# Wait for child to terminate
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elsif ($line =~ /WAIT/) {
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if ($verbose) {
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print "$0: Waiting for child $pid\n";
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}
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wait;
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if ($verbose) {
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print "$0: Child $pid reaped\n";
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}
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}
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# Sleep
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elsif ($line =~ /SLEEP (\d+)/) {
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if ($verbose) {
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print "$0: Sleeping $1 secs\n";
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}
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sleep $1;
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}
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||||
|
||||
# Unknown input
|
||||
else {
|
||||
if ($verbose) {
|
||||
print "$0: Sending :$line: to child $pid\n";
|
||||
}
|
||||
print Writer "$line\n";
|
||||
}
|
||||
}
|
||||
|
||||
#
|
||||
# Parent echoes the output produced by the child.
|
||||
#
|
||||
close Writer;
|
||||
if ($verbose) {
|
||||
print "$0: Reading data from child $pid\n";
|
||||
}
|
||||
while ($line = <Reader>) {
|
||||
print $line;
|
||||
}
|
||||
close Reader;
|
||||
|
||||
# Finally, parent reaps child
|
||||
wait;
|
||||
|
||||
if ($verbose) {
|
||||
print "$0: Shell terminated\n";
|
||||
}
|
||||
|
||||
exit;
|
||||
Binary file not shown.
|
|
@ -0,0 +1,5 @@
|
|||
#
|
||||
# trace01.txt - Properly terminate on EOF.
|
||||
#
|
||||
CLOSE
|
||||
WAIT
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
#
|
||||
# trace02.txt - Process builtin quit command.
|
||||
#
|
||||
quit
|
||||
WAIT
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
#
|
||||
# trace03.txt - Run a foreground job.
|
||||
#
|
||||
/bin/echo tsh> quit
|
||||
quit
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
#
|
||||
# trace04.txt - Run a background job.
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 1 \046
|
||||
./myspin 1 &
|
||||
|
|
@ -0,0 +1,11 @@
|
|||
#
|
||||
# trace05.txt - Process jobs builtin command.
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 2 \046
|
||||
./myspin 2 &
|
||||
|
||||
/bin/echo -e tsh> ./myspin 3 \046
|
||||
./myspin 3 &
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
#
|
||||
# trace06.txt - Forward SIGINT to foreground job.
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 4
|
||||
./myspin 4
|
||||
|
||||
SLEEP 2
|
||||
INT
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
#
|
||||
# trace07.txt - Forward SIGINT only to foreground job.
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 4 \046
|
||||
./myspin 4 &
|
||||
|
||||
/bin/echo -e tsh> ./myspin 5
|
||||
./myspin 5
|
||||
|
||||
SLEEP 2
|
||||
INT
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
#
|
||||
# trace08.txt - Forward SIGTSTP only to foreground job.
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 4 \046
|
||||
./myspin 4 &
|
||||
|
||||
/bin/echo -e tsh> ./myspin 5
|
||||
./myspin 5
|
||||
|
||||
SLEEP 2
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
#
|
||||
# trace09.txt - Process bg builtin command
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 4 \046
|
||||
./myspin 4 &
|
||||
|
||||
/bin/echo -e tsh> ./myspin 5
|
||||
./myspin 5
|
||||
|
||||
SLEEP 2
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> bg %2
|
||||
bg %2
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
#
|
||||
# trace10.txt - Process fg builtin command.
|
||||
#
|
||||
/bin/echo -e tsh> ./myspin 4 \046
|
||||
./myspin 4 &
|
||||
|
||||
SLEEP 1
|
||||
/bin/echo tsh> fg %1
|
||||
fg %1
|
||||
|
||||
SLEEP 1
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> fg %1
|
||||
fg %1
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
#
|
||||
# trace11.txt - Forward SIGINT to every process in foreground process group
|
||||
#
|
||||
/bin/echo -e tsh> ./mysplit 4
|
||||
./mysplit 4
|
||||
|
||||
SLEEP 2
|
||||
INT
|
||||
|
||||
/bin/echo tsh> /bin/ps a
|
||||
/bin/ps a
|
||||
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
#
|
||||
# trace12.txt - Forward SIGTSTP to every process in foreground process group
|
||||
#
|
||||
/bin/echo -e tsh> ./mysplit 4
|
||||
./mysplit 4
|
||||
|
||||
SLEEP 2
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> /bin/ps a
|
||||
/bin/ps a
|
||||
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
#
|
||||
# trace13.txt - Restart every stopped process in process group
|
||||
#
|
||||
/bin/echo -e tsh> ./mysplit 4
|
||||
./mysplit 4
|
||||
|
||||
SLEEP 2
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> /bin/ps a
|
||||
/bin/ps a
|
||||
|
||||
/bin/echo tsh> fg %1
|
||||
fg %1
|
||||
|
||||
/bin/echo tsh> /bin/ps a
|
||||
/bin/ps a
|
||||
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,47 @@
|
|||
#
|
||||
# trace14.txt - Simple error handling
|
||||
#
|
||||
/bin/echo tsh> ./bogus
|
||||
./bogus
|
||||
|
||||
/bin/echo -e tsh> ./myspin 4 \046
|
||||
./myspin 4 &
|
||||
|
||||
/bin/echo tsh> fg
|
||||
fg
|
||||
|
||||
/bin/echo tsh> bg
|
||||
bg
|
||||
|
||||
/bin/echo tsh> fg a
|
||||
fg a
|
||||
|
||||
/bin/echo tsh> bg a
|
||||
bg a
|
||||
|
||||
/bin/echo tsh> fg 9999999
|
||||
fg 9999999
|
||||
|
||||
/bin/echo tsh> bg 9999999
|
||||
bg 9999999
|
||||
|
||||
/bin/echo tsh> fg %2
|
||||
fg %2
|
||||
|
||||
/bin/echo tsh> fg %1
|
||||
fg %1
|
||||
|
||||
SLEEP 2
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> bg %2
|
||||
bg %2
|
||||
|
||||
/bin/echo tsh> bg %1
|
||||
bg %1
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
#
|
||||
# trace15.txt - Putting it all together
|
||||
#
|
||||
|
||||
/bin/echo tsh> ./bogus
|
||||
./bogus
|
||||
|
||||
/bin/echo tsh> ./myspin 10
|
||||
./myspin 10
|
||||
|
||||
SLEEP 2
|
||||
INT
|
||||
|
||||
/bin/echo -e tsh> ./myspin 3 \046
|
||||
./myspin 3 &
|
||||
|
||||
/bin/echo -e tsh> ./myspin 4 \046
|
||||
./myspin 4 &
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> fg %1
|
||||
fg %1
|
||||
|
||||
SLEEP 2
|
||||
TSTP
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> bg %3
|
||||
bg %3
|
||||
|
||||
/bin/echo tsh> bg %1
|
||||
bg %1
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> fg %1
|
||||
fg %1
|
||||
|
||||
/bin/echo tsh> quit
|
||||
quit
|
||||
|
||||
|
|
@ -0,0 +1,16 @@
|
|||
#
|
||||
# trace16.txt - Tests whether the shell can handle SIGTSTP and SIGINT
|
||||
# signals that come from other processes instead of the terminal.
|
||||
#
|
||||
|
||||
/bin/echo tsh> ./mystop 2
|
||||
./mystop 2
|
||||
|
||||
SLEEP 3
|
||||
|
||||
/bin/echo tsh> jobs
|
||||
jobs
|
||||
|
||||
/bin/echo tsh> ./myint 2
|
||||
./myint 2
|
||||
|
||||
|
|
@ -0,0 +1,509 @@
|
|||
/*
|
||||
* tsh - A tiny shell program with job control
|
||||
*
|
||||
* <Put your name and login ID here>
|
||||
*/
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <ctype.h>
|
||||
#include <signal.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
#include <errno.h>
|
||||
|
||||
/* Misc manifest constants */
|
||||
#define MAXLINE 1024 /* max line size */
|
||||
#define MAXARGS 128 /* max args on a command line */
|
||||
#define MAXJOBS 16 /* max jobs at any point in time */
|
||||
#define MAXJID 1<<16 /* max job ID */
|
||||
|
||||
/* Job states */
|
||||
#define UNDEF 0 /* undefined */
|
||||
#define FG 1 /* running in foreground */
|
||||
#define BG 2 /* running in background */
|
||||
#define ST 3 /* stopped */
|
||||
|
||||
/*
|
||||
* Jobs states: FG (foreground), BG (background), ST (stopped)
|
||||
* Job state transitions and enabling actions:
|
||||
* FG -> ST : ctrl-z
|
||||
* ST -> FG : fg command
|
||||
* ST -> BG : bg command
|
||||
* BG -> FG : fg command
|
||||
* At most 1 job can be in the FG state.
|
||||
*/
|
||||
|
||||
/* Global variables */
|
||||
extern char **environ; /* defined in libc */
|
||||
char prompt[] = "tsh> "; /* command line prompt (DO NOT CHANGE) */
|
||||
int verbose = 0; /* if true, print additional output */
|
||||
int nextjid = 1; /* next job ID to allocate */
|
||||
char sbuf[MAXLINE]; /* for composing sprintf messages */
|
||||
|
||||
struct job_t { /* The job struct */
|
||||
pid_t pid; /* job PID */
|
||||
int jid; /* job ID [1, 2, ...] */
|
||||
int state; /* UNDEF, BG, FG, or ST */
|
||||
char cmdline[MAXLINE]; /* command line */
|
||||
};
|
||||
struct job_t jobs[MAXJOBS]; /* The job list */
|
||||
/* End global variables */
|
||||
|
||||
|
||||
/* Function prototypes */
|
||||
|
||||
/* Here are the functions that you will implement */
|
||||
void eval(char *cmdline);
|
||||
int builtin_cmd(char **argv);
|
||||
void do_bgfg(char **argv);
|
||||
void waitfg(pid_t pid);
|
||||
|
||||
void sigchld_handler(int sig);
|
||||
void sigtstp_handler(int sig);
|
||||
void sigint_handler(int sig);
|
||||
|
||||
/* Here are helper routines that we've provided for you */
|
||||
int parseline(const char *cmdline, char **argv);
|
||||
void sigquit_handler(int sig);
|
||||
|
||||
void clearjob(struct job_t *job);
|
||||
void initjobs(struct job_t *jobs);
|
||||
int maxjid(struct job_t *jobs);
|
||||
int addjob(struct job_t *jobs, pid_t pid, int state, char *cmdline);
|
||||
int deletejob(struct job_t *jobs, pid_t pid);
|
||||
pid_t fgpid(struct job_t *jobs);
|
||||
struct job_t *getjobpid(struct job_t *jobs, pid_t pid);
|
||||
struct job_t *getjobjid(struct job_t *jobs, int jid);
|
||||
int pid2jid(pid_t pid);
|
||||
void listjobs(struct job_t *jobs);
|
||||
|
||||
void usage(void);
|
||||
void unix_error(char *msg);
|
||||
void app_error(char *msg);
|
||||
typedef void handler_t(int);
|
||||
handler_t *Signal(int signum, handler_t *handler);
|
||||
|
||||
/*
|
||||
* main - The shell's main routine
|
||||
*/
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
char c;
|
||||
char cmdline[MAXLINE];
|
||||
int emit_prompt = 1; /* emit prompt (default) */
|
||||
|
||||
/* Redirect stderr to stdout (so that driver will get all output
|
||||
* on the pipe connected to stdout) */
|
||||
dup2(1, 2);
|
||||
|
||||
/* Parse the command line */
|
||||
while ((c = getopt(argc, argv, "hvp")) != EOF) {
|
||||
switch (c) {
|
||||
case 'h': /* print help message */
|
||||
usage();
|
||||
break;
|
||||
case 'v': /* emit additional diagnostic info */
|
||||
verbose = 1;
|
||||
break;
|
||||
case 'p': /* don't print a prompt */
|
||||
emit_prompt = 0; /* handy for automatic testing */
|
||||
break;
|
||||
default:
|
||||
usage();
|
||||
}
|
||||
}
|
||||
|
||||
/* Install the signal handlers */
|
||||
|
||||
/* These are the ones you will need to implement */
|
||||
Signal(SIGINT, sigint_handler); /* ctrl-c */
|
||||
Signal(SIGTSTP, sigtstp_handler); /* ctrl-z */
|
||||
Signal(SIGCHLD, sigchld_handler); /* Terminated or stopped child */
|
||||
|
||||
/* This one provides a clean way to kill the shell */
|
||||
Signal(SIGQUIT, sigquit_handler);
|
||||
|
||||
/* Initialize the job list */
|
||||
initjobs(jobs);
|
||||
|
||||
/* Execute the shell's read/eval loop */
|
||||
while (1) {
|
||||
|
||||
/* Read command line */
|
||||
if (emit_prompt) {
|
||||
printf("%s", prompt);
|
||||
fflush(stdout);
|
||||
}
|
||||
if ((fgets(cmdline, MAXLINE, stdin) == NULL) && ferror(stdin))
|
||||
app_error("fgets error");
|
||||
if (feof(stdin)) { /* End of file (ctrl-d) */
|
||||
fflush(stdout);
|
||||
exit(0);
|
||||
}
|
||||
|
||||
/* Evaluate the command line */
|
||||
eval(cmdline);
|
||||
fflush(stdout);
|
||||
fflush(stdout);
|
||||
}
|
||||
|
||||
exit(0); /* control never reaches here */
|
||||
}
|
||||
|
||||
/*
|
||||
* eval - Evaluate the command line that the user has just typed in
|
||||
*
|
||||
* If the user has requested a built-in command (quit, jobs, bg or fg)
|
||||
* then execute it immediately. Otherwise, fork a child process and
|
||||
* run the job in the context of the child. If the job is running in
|
||||
* the foreground, wait for it to terminate and then return. Note:
|
||||
* each child process must have a unique process group ID so that our
|
||||
* background children don't receive SIGINT (SIGTSTP) from the kernel
|
||||
* when we type ctrl-c (ctrl-z) at the keyboard.
|
||||
*/
|
||||
void eval(char *cmdline)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* parseline - Parse the command line and build the argv array.
|
||||
*
|
||||
* Characters enclosed in single quotes are treated as a single
|
||||
* argument. Return true if the user has requested a BG job, false if
|
||||
* the user has requested a FG job.
|
||||
*/
|
||||
int parseline(const char *cmdline, char **argv)
|
||||
{
|
||||
static char array[MAXLINE]; /* holds local copy of command line */
|
||||
char *buf = array; /* ptr that traverses command line */
|
||||
char *delim; /* points to first space delimiter */
|
||||
int argc; /* number of args */
|
||||
int bg; /* background job? */
|
||||
|
||||
strcpy(buf, cmdline);
|
||||
buf[strlen(buf)-1] = ' '; /* replace trailing '\n' with space */
|
||||
while (*buf && (*buf == ' ')) /* ignore leading spaces */
|
||||
buf++;
|
||||
|
||||
/* Build the argv list */
|
||||
argc = 0;
|
||||
if (*buf == '\'') {
|
||||
buf++;
|
||||
delim = strchr(buf, '\'');
|
||||
}
|
||||
else {
|
||||
delim = strchr(buf, ' ');
|
||||
}
|
||||
|
||||
while (delim) {
|
||||
argv[argc++] = buf;
|
||||
*delim = '\0';
|
||||
buf = delim + 1;
|
||||
while (*buf && (*buf == ' ')) /* ignore spaces */
|
||||
buf++;
|
||||
|
||||
if (*buf == '\'') {
|
||||
buf++;
|
||||
delim = strchr(buf, '\'');
|
||||
}
|
||||
else {
|
||||
delim = strchr(buf, ' ');
|
||||
}
|
||||
}
|
||||
argv[argc] = NULL;
|
||||
|
||||
if (argc == 0) /* ignore blank line */
|
||||
return 1;
|
||||
|
||||
/* should the job run in the background? */
|
||||
if ((bg = (*argv[argc-1] == '&')) != 0) {
|
||||
argv[--argc] = NULL;
|
||||
}
|
||||
return bg;
|
||||
}
|
||||
|
||||
/*
|
||||
* builtin_cmd - If the user has typed a built-in command then execute
|
||||
* it immediately.
|
||||
*/
|
||||
int builtin_cmd(char **argv)
|
||||
{
|
||||
return 0; /* not a builtin command */
|
||||
}
|
||||
|
||||
/*
|
||||
* do_bgfg - Execute the builtin bg and fg commands
|
||||
*/
|
||||
void do_bgfg(char **argv)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* waitfg - Block until process pid is no longer the foreground process
|
||||
*/
|
||||
void waitfg(pid_t pid)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/*****************
|
||||
* Signal handlers
|
||||
*****************/
|
||||
|
||||
/*
|
||||
* sigchld_handler - The kernel sends a SIGCHLD to the shell whenever
|
||||
* a child job terminates (becomes a zombie), or stops because it
|
||||
* received a SIGSTOP or SIGTSTP signal. The handler reaps all
|
||||
* available zombie children, but doesn't wait for any other
|
||||
* currently running children to terminate.
|
||||
*/
|
||||
void sigchld_handler(int sig)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* sigint_handler - The kernel sends a SIGINT to the shell whenver the
|
||||
* user types ctrl-c at the keyboard. Catch it and send it along
|
||||
* to the foreground job.
|
||||
*/
|
||||
void sigint_handler(int sig)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* sigtstp_handler - The kernel sends a SIGTSTP to the shell whenever
|
||||
* the user types ctrl-z at the keyboard. Catch it and suspend the
|
||||
* foreground job by sending it a SIGTSTP.
|
||||
*/
|
||||
void sigtstp_handler(int sig)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
/*********************
|
||||
* End signal handlers
|
||||
*********************/
|
||||
|
||||
/***********************************************
|
||||
* Helper routines that manipulate the job list
|
||||
**********************************************/
|
||||
|
||||
/* clearjob - Clear the entries in a job struct */
|
||||
void clearjob(struct job_t *job) {
|
||||
job->pid = 0;
|
||||
job->jid = 0;
|
||||
job->state = UNDEF;
|
||||
job->cmdline[0] = '\0';
|
||||
}
|
||||
|
||||
/* initjobs - Initialize the job list */
|
||||
void initjobs(struct job_t *jobs) {
|
||||
int i;
|
||||
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
clearjob(&jobs[i]);
|
||||
}
|
||||
|
||||
/* maxjid - Returns largest allocated job ID */
|
||||
int maxjid(struct job_t *jobs)
|
||||
{
|
||||
int i, max=0;
|
||||
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].jid > max)
|
||||
max = jobs[i].jid;
|
||||
return max;
|
||||
}
|
||||
|
||||
/* addjob - Add a job to the job list */
|
||||
int addjob(struct job_t *jobs, pid_t pid, int state, char *cmdline)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (pid < 1)
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < MAXJOBS; i++) {
|
||||
if (jobs[i].pid == 0) {
|
||||
jobs[i].pid = pid;
|
||||
jobs[i].state = state;
|
||||
jobs[i].jid = nextjid++;
|
||||
if (nextjid > MAXJOBS)
|
||||
nextjid = 1;
|
||||
strcpy(jobs[i].cmdline, cmdline);
|
||||
if(verbose){
|
||||
printf("Added job [%d] %d %s\n", jobs[i].jid, jobs[i].pid, jobs[i].cmdline);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
printf("Tried to create too many jobs\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* deletejob - Delete a job whose PID=pid from the job list */
|
||||
int deletejob(struct job_t *jobs, pid_t pid)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (pid < 1)
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < MAXJOBS; i++) {
|
||||
if (jobs[i].pid == pid) {
|
||||
clearjob(&jobs[i]);
|
||||
nextjid = maxjid(jobs)+1;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* fgpid - Return PID of current foreground job, 0 if no such job */
|
||||
pid_t fgpid(struct job_t *jobs) {
|
||||
int i;
|
||||
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].state == FG)
|
||||
return jobs[i].pid;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* getjobpid - Find a job (by PID) on the job list */
|
||||
struct job_t *getjobpid(struct job_t *jobs, pid_t pid) {
|
||||
int i;
|
||||
|
||||
if (pid < 1)
|
||||
return NULL;
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].pid == pid)
|
||||
return &jobs[i];
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* getjobjid - Find a job (by JID) on the job list */
|
||||
struct job_t *getjobjid(struct job_t *jobs, int jid)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (jid < 1)
|
||||
return NULL;
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].jid == jid)
|
||||
return &jobs[i];
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* pid2jid - Map process ID to job ID */
|
||||
int pid2jid(pid_t pid)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (pid < 1)
|
||||
return 0;
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].pid == pid) {
|
||||
return jobs[i].jid;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* listjobs - Print the job list */
|
||||
void listjobs(struct job_t *jobs)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < MAXJOBS; i++) {
|
||||
if (jobs[i].pid != 0) {
|
||||
printf("[%d] (%d) ", jobs[i].jid, jobs[i].pid);
|
||||
switch (jobs[i].state) {
|
||||
case BG:
|
||||
printf("Running ");
|
||||
break;
|
||||
case FG:
|
||||
printf("Foreground ");
|
||||
break;
|
||||
case ST:
|
||||
printf("Stopped ");
|
||||
break;
|
||||
default:
|
||||
printf("listjobs: Internal error: job[%d].state=%d ",
|
||||
i, jobs[i].state);
|
||||
}
|
||||
printf("%s", jobs[i].cmdline);
|
||||
}
|
||||
}
|
||||
}
|
||||
/******************************
|
||||
* end job list helper routines
|
||||
******************************/
|
||||
|
||||
|
||||
/***********************
|
||||
* Other helper routines
|
||||
***********************/
|
||||
|
||||
/*
|
||||
* usage - print a help message
|
||||
*/
|
||||
void usage(void)
|
||||
{
|
||||
printf("Usage: shell [-hvp]\n");
|
||||
printf(" -h print this message\n");
|
||||
printf(" -v print additional diagnostic information\n");
|
||||
printf(" -p do not emit a command prompt\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/*
|
||||
* unix_error - unix-style error routine
|
||||
*/
|
||||
void unix_error(char *msg)
|
||||
{
|
||||
fprintf(stdout, "%s: %s\n", msg, strerror(errno));
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/*
|
||||
* app_error - application-style error routine
|
||||
*/
|
||||
void app_error(char *msg)
|
||||
{
|
||||
fprintf(stdout, "%s\n", msg);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Signal - wrapper for the sigaction function
|
||||
*/
|
||||
handler_t *Signal(int signum, handler_t *handler)
|
||||
{
|
||||
struct sigaction action, old_action;
|
||||
|
||||
action.sa_handler = handler;
|
||||
sigemptyset(&action.sa_mask); /* block sigs of type being handled */
|
||||
action.sa_flags = SA_RESTART; /* restart syscalls if possible */
|
||||
|
||||
if (sigaction(signum, &action, &old_action) < 0)
|
||||
unix_error("Signal error");
|
||||
return (old_action.sa_handler);
|
||||
}
|
||||
|
||||
/*
|
||||
* sigquit_handler - The driver program can gracefully terminate the
|
||||
* child shell by sending it a SIGQUIT signal.
|
||||
*/
|
||||
void sigquit_handler(int sig)
|
||||
{
|
||||
printf("Terminating after receipt of SIGQUIT signal\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
|
||||
|
||||
Binary file not shown.
|
|
@ -0,0 +1,220 @@
|
|||
make[1]: Entering directory `/afs/cs.cmu.edu/project/ics/im/labs/shlab/src'
|
||||
./sdriver.pl -t trace01.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace01.txt - Properly terminate on EOF.
|
||||
#
|
||||
./sdriver.pl -t trace02.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace02.txt - Process builtin quit command.
|
||||
#
|
||||
./sdriver.pl -t trace03.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace03.txt - Run a foreground job.
|
||||
#
|
||||
tsh> quit
|
||||
./sdriver.pl -t trace04.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace04.txt - Run a background job.
|
||||
#
|
||||
tsh> ./myspin 1 &
|
||||
[1] (26252) ./myspin 1 &
|
||||
./sdriver.pl -t trace05.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace05.txt - Process jobs builtin command.
|
||||
#
|
||||
tsh> ./myspin 2 &
|
||||
[1] (26256) ./myspin 2 &
|
||||
tsh> ./myspin 3 &
|
||||
[2] (26258) ./myspin 3 &
|
||||
tsh> jobs
|
||||
[1] (26256) Running ./myspin 2 &
|
||||
[2] (26258) Running ./myspin 3 &
|
||||
./sdriver.pl -t trace06.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace06.txt - Forward SIGINT to foreground job.
|
||||
#
|
||||
tsh> ./myspin 4
|
||||
Job [1] (26263) terminated by signal 2
|
||||
./sdriver.pl -t trace07.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace07.txt - Forward SIGINT only to foreground job.
|
||||
#
|
||||
tsh> ./myspin 4 &
|
||||
[1] (26267) ./myspin 4 &
|
||||
tsh> ./myspin 5
|
||||
Job [2] (26269) terminated by signal 2
|
||||
tsh> jobs
|
||||
[1] (26267) Running ./myspin 4 &
|
||||
./sdriver.pl -t trace08.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace08.txt - Forward SIGTSTP only to foreground job.
|
||||
#
|
||||
tsh> ./myspin 4 &
|
||||
[1] (26274) ./myspin 4 &
|
||||
tsh> ./myspin 5
|
||||
Job [2] (26276) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26274) Running ./myspin 4 &
|
||||
[2] (26276) Stopped ./myspin 5
|
||||
./sdriver.pl -t trace09.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace09.txt - Process bg builtin command
|
||||
#
|
||||
tsh> ./myspin 4 &
|
||||
[1] (26281) ./myspin 4 &
|
||||
tsh> ./myspin 5
|
||||
Job [2] (26283) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26281) Running ./myspin 4 &
|
||||
[2] (26283) Stopped ./myspin 5
|
||||
tsh> bg %2
|
||||
[2] (26283) ./myspin 5
|
||||
tsh> jobs
|
||||
[1] (26281) Running ./myspin 4 &
|
||||
[2] (26283) Running ./myspin 5
|
||||
./sdriver.pl -t trace10.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace10.txt - Process fg builtin command.
|
||||
#
|
||||
tsh> ./myspin 4 &
|
||||
[1] (26290) ./myspin 4 &
|
||||
tsh> fg %1
|
||||
Job [1] (26290) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26290) Stopped ./myspin 4 &
|
||||
tsh> fg %1
|
||||
tsh> jobs
|
||||
./sdriver.pl -t trace11.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace11.txt - Forward SIGINT to every process in foreground process group
|
||||
#
|
||||
tsh> ./mysplit 4
|
||||
Job [1] (26298) terminated by signal 2
|
||||
tsh> /bin/ps a
|
||||
PID TTY STAT TIME COMMAND
|
||||
25181 pts/3 S 0:00 -usr/local/bin/tcsh -i
|
||||
26239 pts/3 S 0:00 make tshrefout
|
||||
26240 pts/3 S 0:00 /bin/sh -c make tests > tshref.out 2>&1
|
||||
26241 pts/3 S 0:00 make tests
|
||||
26295 pts/3 S 0:00 perl ./sdriver.pl -t trace11.txt -s ./tsh -a -p
|
||||
26296 pts/3 S 0:00 ./tsh -p
|
||||
26301 pts/3 R 0:00 /bin/ps a
|
||||
./sdriver.pl -t trace12.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace12.txt - Forward SIGTSTP to every process in foreground process group
|
||||
#
|
||||
tsh> ./mysplit 4
|
||||
Job [1] (26305) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26305) Stopped ./mysplit 4
|
||||
tsh> /bin/ps a
|
||||
PID TTY STAT TIME COMMAND
|
||||
25181 pts/3 S 0:00 -usr/local/bin/tcsh -i
|
||||
26239 pts/3 S 0:00 make tshrefout
|
||||
26240 pts/3 S 0:00 /bin/sh -c make tests > tshref.out 2>&1
|
||||
26241 pts/3 S 0:00 make tests
|
||||
26302 pts/3 S 0:00 perl ./sdriver.pl -t trace12.txt -s ./tsh -a -p
|
||||
26303 pts/3 S 0:00 ./tsh -p
|
||||
26305 pts/3 T 0:00 ./mysplit 4
|
||||
26306 pts/3 T 0:00 ./mysplit 4
|
||||
26309 pts/3 R 0:00 /bin/ps a
|
||||
./sdriver.pl -t trace13.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace13.txt - Restart every stopped process in process group
|
||||
#
|
||||
tsh> ./mysplit 4
|
||||
Job [1] (26313) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26313) Stopped ./mysplit 4
|
||||
tsh> /bin/ps a
|
||||
PID TTY STAT TIME COMMAND
|
||||
25181 pts/3 S 0:00 -usr/local/bin/tcsh -i
|
||||
26239 pts/3 S 0:00 make tshrefout
|
||||
26240 pts/3 S 0:00 /bin/sh -c make tests > tshref.out 2>&1
|
||||
26241 pts/3 S 0:00 make tests
|
||||
26310 pts/3 S 0:00 perl ./sdriver.pl -t trace13.txt -s ./tsh -a -p
|
||||
26311 pts/3 S 0:00 ./tsh -p
|
||||
26313 pts/3 T 0:00 ./mysplit 4
|
||||
26314 pts/3 T 0:00 ./mysplit 4
|
||||
26317 pts/3 R 0:00 /bin/ps a
|
||||
tsh> fg %1
|
||||
tsh> /bin/ps a
|
||||
PID TTY STAT TIME COMMAND
|
||||
25181 pts/3 S 0:00 -usr/local/bin/tcsh -i
|
||||
26239 pts/3 S 0:00 make tshrefout
|
||||
26240 pts/3 S 0:00 /bin/sh -c make tests > tshref.out 2>&1
|
||||
26241 pts/3 S 0:00 make tests
|
||||
26310 pts/3 S 0:00 perl ./sdriver.pl -t trace13.txt -s ./tsh -a -p
|
||||
26311 pts/3 S 0:00 ./tsh -p
|
||||
26320 pts/3 R 0:00 /bin/ps a
|
||||
./sdriver.pl -t trace14.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace14.txt - Simple error handling
|
||||
#
|
||||
tsh> ./bogus
|
||||
./bogus: Command not found
|
||||
tsh> ./myspin 4 &
|
||||
[1] (26326) ./myspin 4 &
|
||||
tsh> fg
|
||||
fg command requires PID or %jobid argument
|
||||
tsh> bg
|
||||
bg command requires PID or %jobid argument
|
||||
tsh> fg a
|
||||
fg: argument must be a PID or %jobid
|
||||
tsh> bg a
|
||||
bg: argument must be a PID or %jobid
|
||||
tsh> fg 9999999
|
||||
(9999999): No such process
|
||||
tsh> bg 9999999
|
||||
(9999999): No such process
|
||||
tsh> fg %2
|
||||
%2: No such job
|
||||
tsh> fg %1
|
||||
Job [1] (26326) stopped by signal 20
|
||||
tsh> bg %2
|
||||
%2: No such job
|
||||
tsh> bg %1
|
||||
[1] (26326) ./myspin 4 &
|
||||
tsh> jobs
|
||||
[1] (26326) Running ./myspin 4 &
|
||||
./sdriver.pl -t trace15.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace15.txt - Putting it all together
|
||||
#
|
||||
tsh> ./bogus
|
||||
./bogus: Command not found
|
||||
tsh> ./myspin 10
|
||||
Job [1] (26343) terminated by signal 2
|
||||
tsh> ./myspin 3 &
|
||||
[1] (26345) ./myspin 3 &
|
||||
tsh> ./myspin 4 &
|
||||
[2] (26347) ./myspin 4 &
|
||||
tsh> jobs
|
||||
[1] (26345) Running ./myspin 3 &
|
||||
[2] (26347) Running ./myspin 4 &
|
||||
tsh> fg %1
|
||||
Job [1] (26345) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26345) Stopped ./myspin 3 &
|
||||
[2] (26347) Running ./myspin 4 &
|
||||
tsh> bg %3
|
||||
%3: No such job
|
||||
tsh> bg %1
|
||||
[1] (26345) ./myspin 3 &
|
||||
tsh> jobs
|
||||
[1] (26345) Running ./myspin 3 &
|
||||
[2] (26347) Running ./myspin 4 &
|
||||
tsh> fg %1
|
||||
tsh> quit
|
||||
./sdriver.pl -t trace16.txt -s ./tsh -a "-p"
|
||||
#
|
||||
# trace16.txt - Tests whether the shell can handle SIGTSTP and SIGINT
|
||||
# signals that come from other processes instead of the terminal.
|
||||
#
|
||||
tsh> ./mystop 2
|
||||
Job [1] (26359) stopped by signal 20
|
||||
tsh> jobs
|
||||
[1] (26359) Stopped ./mystop 2
|
||||
tsh> ./myint 2
|
||||
Job [2] (26362) terminated by signal 2
|
||||
make[1]: Leaving directory `/afs/cs.cmu.edu/project/ics/im/labs/shlab/src'
|
||||
Loading…
Reference in New Issue