Tasks till trace03 and added todo.org
TuDatTr
parent
cf88f9601d
commit
1540d090d7
3
Makefile
3
Makefile
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@ -7,7 +7,8 @@ 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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# CFLAGS = -Wall -O2
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CFLAGS = -Wall -O0 -g3
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FILES = $(TSH) ./myspin ./mysplit ./mystop ./myint
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all: $(FILES)
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@ -0,0 +1,17 @@
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Testcases:
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- [x] trace01.txt - Properly terminate on EOF.
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- [x] trace02.txt - Process builtin quit command.
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- [x] trace03.txt - Run a foreground job.
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- [ ] trace04.txt - Run a background job.
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- [ ] trace05.txt - Process jobs builtin command.
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- [ ] trace06.txt - Forward SIGINT to foreground job.
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- [ ] trace07.txt - Forward SIGINT only to foreground job.
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- [ ] trace08.txt - Forward SIGTSTP only to foreground job.
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- [ ] trace09.txt - Process bg builtin command
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- [ ] trace10.txt - Process fg builtin command.
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- [ ] trace11.txt - Forward SIGINT to every process in foreground process group
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- [ ] trace12.txt - Forward SIGTSTP to every process in foreground process group
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- [ ] trace13.txt - Restart every stopped process in process group
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- [ ] trace14.txt - Simple error handling
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- [ ] trace15.txt - Putting it all together
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473
tsh.c
473
tsh.c
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@ -43,10 +43,10 @@ int nextjid = 1; /* next job ID to allocate */
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char sbuf[MAXLINE]; /* for composing sprintf messages */
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struct job_t { /* The job struct */
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pid_t pid; /* job PID */
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int jid; /* job ID [1, 2, ...] */
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int state; /* UNDEF, BG, FG, or ST */
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char cmdline[MAXLINE]; /* command line */
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pid_t pid; /* job PID */
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int jid; /* job ID [1, 2, ...] */
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int state; /* UNDEF, BG, FG, or ST */
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char cmdline[MAXLINE]; /* command line */
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};
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struct job_t jobs[MAXJOBS]; /* The job list */
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/* End global variables */
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@ -90,66 +90,66 @@ handler_t *Signal(int signum, handler_t *handler);
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*/
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int main(int argc, char **argv)
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{
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char c;
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char cmdline[MAXLINE];
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int emit_prompt = 1; /* emit prompt (default) */
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char c;
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char cmdline[MAXLINE];
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int emit_prompt = 1; /* emit prompt (default) */
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/* Redirect stderr to stdout (so that driver will get all output
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* on the pipe connected to stdout) */
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dup2(1, 2);
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/* Redirect stderr to stdout (so that driver will get all output
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* on the pipe connected to stdout) */
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dup2(1, 2);
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/* Parse the command line */
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while ((c = getopt(argc, argv, "hvp")) != EOF) {
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switch (c) {
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case 'h': /* print help message */
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usage();
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break;
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case 'v': /* emit additional diagnostic info */
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verbose = 1;
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break;
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case 'p': /* don't print a prompt */
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emit_prompt = 0; /* handy for automatic testing */
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break;
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default:
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usage();
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}
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/* Parse the command line */
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while ((c = getopt(argc, argv, "hvp")) != EOF) {
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switch (c) {
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case 'h': /* print help message */
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usage();
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break;
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case 'v': /* emit additional diagnostic info */
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verbose = 1;
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break;
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case 'p': /* don't print a prompt */
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emit_prompt = 0; /* handy for automatic testing */
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break;
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default:
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usage();
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}
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}
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/* Install the signal handlers */
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/* These are the ones you will need to implement */
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Signal(SIGINT, sigint_handler); /* ctrl-c */
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Signal(SIGTSTP, sigtstp_handler); /* ctrl-z */
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Signal(SIGCHLD, sigchld_handler); /* Terminated or stopped child */
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/* This one provides a clean way to kill the shell */
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Signal(SIGQUIT, sigquit_handler);
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/* Initialize the job list */
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initjobs(jobs);
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/* Execute the shell's read/eval loop */
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while (1) {
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/* Read command line */
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if (emit_prompt) {
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printf("%s", prompt);
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fflush(stdout);
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}
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if ((fgets(cmdline, MAXLINE, stdin) == NULL) && ferror(stdin))
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app_error("fgets error");
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if (feof(stdin)) { /* End of file (ctrl-d) */
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fflush(stdout);
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exit(0);
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}
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/* Install the signal handlers */
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/* Evaluate the command line */
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eval(cmdline);
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fflush(stdout);
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fflush(stdout);
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}
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/* These are the ones you will need to implement */
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Signal(SIGINT, sigint_handler); /* ctrl-c */
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Signal(SIGTSTP, sigtstp_handler); /* ctrl-z */
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Signal(SIGCHLD, sigchld_handler); /* Terminated or stopped child */
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/* This one provides a clean way to kill the shell */
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Signal(SIGQUIT, sigquit_handler);
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/* Initialize the job list */
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initjobs(jobs);
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/* Execute the shell's read/eval loop */
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while (1) {
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/* Read command line */
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if (emit_prompt) {
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printf("%s", prompt);
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fflush(stdout);
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}
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if ((fgets(cmdline, MAXLINE, stdin) == NULL) && ferror(stdin))
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app_error("fgets error");
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if (feof(stdin)) { /* End of file (ctrl-d) */
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fflush(stdout);
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exit(0);
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}
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/* Evaluate the command line */
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eval(cmdline);
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fflush(stdout);
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fflush(stdout);
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}
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exit(0); /* control never reaches here */
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exit(0); /* control never reaches here */
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}
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/*
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@ -162,10 +162,32 @@ int main(int argc, char **argv)
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* each child process must have a unique process group ID so that our
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* background children don't receive SIGINT (SIGTSTP) from the kernel
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* when we type ctrl-c (ctrl-z) at the keyboard.
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*/
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*/
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void eval(char *cmdline)
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{
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return;
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char *argv[MAXARGS]; // Save flags for process
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int bg = parseline(cmdline, argv); // See whether cmd is back or foreground and parse cmdline
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struct job_t *job;
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if (!builtin_cmd(argv)) { // if cmdline is not a builtin
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int pid = fork(); // fork process
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if (pid == 0) { // Child Process
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if (execve(argv[0], argv, environ) != 0) { // if exec failed
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printf("Command not found.\n");
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exit(0);
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}
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exit(0);
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} else { // Parent Process
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wait(NULL);
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if (bg) {
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addjob(jobs, pid, BG, cmdline);
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job = getjobpid(jobs, pid);
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printf("[%d] (%d) %s", job->jid, pid, cmdline);
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} else {
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addjob(jobs, pid, FG, cmdline);
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}
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}
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}
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return;
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}
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/*
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@ -177,52 +199,52 @@ void eval(char *cmdline)
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*/
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int parseline(const char *cmdline, char **argv)
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{
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static char array[MAXLINE]; /* holds local copy of command line */
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char *buf = array; /* ptr that traverses command line */
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char *delim; /* points to first space delimiter */
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int argc; /* number of args */
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int bg; /* background job? */
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static char array[MAXLINE]; /* holds local copy of command line */
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char *buf = array; /* ptr that traverses command line */
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char *delim; /* points to first space delimiter */
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int argc; /* number of args */
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int bg; /* background job? */
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strcpy(buf, cmdline);
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buf[strlen(buf)-1] = ' '; /* replace trailing '\n' with space */
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while (*buf && (*buf == ' ')) /* ignore leading spaces */
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buf++;
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strcpy(buf, cmdline);
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buf[strlen(buf)-1] = ' '; /* replace trailing '\n' with space */
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while (*buf && (*buf == ' ')) /* ignore leading spaces */
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buf++;
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/* Build the argv list */
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argc = 0;
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if (*buf == '\'') {
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buf++;
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delim = strchr(buf, '\'');
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}
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else {
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delim = strchr(buf, ' ');
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}
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while (delim) {
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argv[argc++] = buf;
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*delim = '\0';
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buf = delim + 1;
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while (*buf && (*buf == ' ')) /* ignore spaces */
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buf++;
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/* Build the argv list */
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argc = 0;
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if (*buf == '\'') {
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buf++;
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delim = strchr(buf, '\'');
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buf++;
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delim = strchr(buf, '\'');
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}
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else {
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delim = strchr(buf, ' ');
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delim = strchr(buf, ' ');
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}
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while (delim) {
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argv[argc++] = buf;
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*delim = '\0';
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buf = delim + 1;
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while (*buf && (*buf == ' ')) /* ignore spaces */
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buf++;
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if (*buf == '\'') {
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buf++;
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delim = strchr(buf, '\'');
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}
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else {
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delim = strchr(buf, ' ');
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}
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}
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argv[argc] = NULL;
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}
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argv[argc] = NULL;
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if (argc == 0) /* ignore blank line */
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return 1;
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if (argc == 0) /* ignore blank line */
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return 1;
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/* should the job run in the background? */
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if ((bg = (*argv[argc-1] == '&')) != 0) {
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argv[--argc] = NULL;
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}
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return bg;
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/* should the job run in the background? */
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if ((bg = (*argv[argc-1] == '&')) != 0) {
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argv[--argc] = NULL;
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}
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return bg;
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}
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/*
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@ -231,7 +253,16 @@ int parseline(const char *cmdline, char **argv)
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*/
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int builtin_cmd(char **argv)
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{
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return 0; /* not a builtin command */
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if (!strcmp(argv[0], "quit")) {
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exit(0);
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} else if (!strcmp(argv[0], "jobs")) {
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listjobs(jobs);
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return 1;
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} else if (!strcmp(argv[0], "bg") || !strcmp(argv[0], "fg")) {
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do_bgfg(argv);
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return 1;
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}
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return 0; /* not a builtin command */
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}
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/*
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@ -239,7 +270,27 @@ int builtin_cmd(char **argv)
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*/
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void do_bgfg(char **argv)
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{
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return;
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// struct job_t* job;
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// if (argv[1][0] == '%') { // if job is chosing via jid
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// printf("jid: %s", &argv[1][1]);
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// job = getjobjid(jobs, atoi(&argv[1][1]));
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// } else { // if job is chosing via pid
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// printf("pid: %s", argv[1]);
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// job = getjobpid(jobs, atoi(argv[1]));
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// }
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// if (job != NULL) {
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// if (!strcmp(argv[0], "bg")) { // Do this if bg
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// if (job->state == ST) {
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// job->state = BG;
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// }
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// } else { // Do this if fg
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// if (job->state == ST || job->state == BG) {
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// job->state = FG;
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// }
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// }
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// }
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return;
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}
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/*
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@ -247,7 +298,10 @@ void do_bgfg(char **argv)
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*/
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void waitfg(pid_t pid)
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{
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return;
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// while (pid == fgpid(jobs)) {
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// sleep(1);
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// }
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return;
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}
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/*****************
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@ -263,7 +317,8 @@ void waitfg(pid_t pid)
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*/
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void sigchld_handler(int sig)
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{
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return;
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deletejob(jobs, fgpid(jobs));
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return;
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}
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/*
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@ -273,7 +328,7 @@ void sigchld_handler(int sig)
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*/
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void sigint_handler(int sig)
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{
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return;
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return;
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}
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/*
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@ -283,7 +338,7 @@ void sigint_handler(int sig)
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*/
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void sigtstp_handler(int sig)
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{
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return;
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return;
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}
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/*********************
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@ -296,149 +351,149 @@ void sigtstp_handler(int sig)
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/* clearjob - Clear the entries in a job struct */
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void clearjob(struct job_t *job) {
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job->pid = 0;
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job->jid = 0;
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job->state = UNDEF;
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job->cmdline[0] = '\0';
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job->pid = 0;
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job->jid = 0;
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job->state = UNDEF;
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job->cmdline[0] = '\0';
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}
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/* initjobs - Initialize the job list */
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void initjobs(struct job_t *jobs) {
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int i;
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int i;
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for (i = 0; i < MAXJOBS; i++)
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clearjob(&jobs[i]);
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for (i = 0; i < MAXJOBS; i++)
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clearjob(&jobs[i]);
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}
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/* maxjid - Returns largest allocated job ID */
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int maxjid(struct job_t *jobs)
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{
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int i, max=0;
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int i, max=0;
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for (i = 0; i < MAXJOBS; i++)
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if (jobs[i].jid > max)
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max = jobs[i].jid;
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return max;
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for (i = 0; i < MAXJOBS; i++)
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if (jobs[i].jid > max)
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max = jobs[i].jid;
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return max;
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}
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/* addjob - Add a job to the job list */
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int addjob(struct job_t *jobs, pid_t pid, int state, char *cmdline)
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{
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int i;
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int i;
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if (pid < 1)
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return 0;
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for (i = 0; i < MAXJOBS; i++) {
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if (jobs[i].pid == 0) {
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jobs[i].pid = pid;
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jobs[i].state = state;
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jobs[i].jid = nextjid++;
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if (nextjid > MAXJOBS)
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nextjid = 1;
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strcpy(jobs[i].cmdline, cmdline);
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if(verbose){
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printf("Added job [%d] %d %s\n", jobs[i].jid, jobs[i].pid, jobs[i].cmdline);
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}
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return 1;
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}
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}
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printf("Tried to create too many jobs\n");
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if (pid < 1)
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return 0;
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for (i = 0; i < MAXJOBS; i++) {
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if (jobs[i].pid == 0) {
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jobs[i].pid = pid;
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jobs[i].state = state;
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jobs[i].jid = nextjid++;
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if (nextjid > MAXJOBS)
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nextjid = 1;
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strcpy(jobs[i].cmdline, cmdline);
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if(verbose){
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printf("Added job [%d] %d %s\n", jobs[i].jid, jobs[i].pid, jobs[i].cmdline);
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}
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return 1;
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}
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}
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printf("Tried to create too many jobs\n");
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return 0;
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}
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/* deletejob - Delete a job whose PID=pid from the job list */
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int deletejob(struct job_t *jobs, pid_t pid)
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{
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int i;
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int i;
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if (pid < 1)
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return 0;
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for (i = 0; i < MAXJOBS; i++) {
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if (jobs[i].pid == pid) {
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clearjob(&jobs[i]);
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nextjid = maxjid(jobs)+1;
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return 1;
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}
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}
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if (pid < 1)
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return 0;
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for (i = 0; i < MAXJOBS; i++) {
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if (jobs[i].pid == pid) {
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clearjob(&jobs[i]);
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nextjid = maxjid(jobs)+1;
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return 1;
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}
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}
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return 0;
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}
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/* fgpid - Return PID of current foreground job, 0 if no such job */
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pid_t fgpid(struct job_t *jobs) {
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int i;
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int i;
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for (i = 0; i < MAXJOBS; i++)
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if (jobs[i].state == FG)
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return jobs[i].pid;
|
||||
return 0;
|
||||
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;
|
||||
int i;
|
||||
|
||||
if (pid < 1)
|
||||
return NULL;
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].pid == pid)
|
||||
return &jobs[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;
|
||||
int i;
|
||||
|
||||
if (jid < 1)
|
||||
return NULL;
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].jid == jid)
|
||||
return &jobs[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;
|
||||
int i;
|
||||
|
||||
if (pid < 1)
|
||||
return 0;
|
||||
for (i = 0; i < MAXJOBS; i++)
|
||||
if (jobs[i].pid == pid) {
|
||||
return jobs[i].jid;
|
||||
}
|
||||
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;
|
||||
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);
|
||||
}
|
||||
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
|
||||
|
|
@ -454,11 +509,11 @@ void listjobs(struct job_t *jobs)
|
|||
*/
|
||||
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);
|
||||
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);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -466,8 +521,8 @@ void usage(void)
|
|||
*/
|
||||
void unix_error(char *msg)
|
||||
{
|
||||
fprintf(stdout, "%s: %s\n", msg, strerror(errno));
|
||||
exit(1);
|
||||
fprintf(stdout, "%s: %s\n", msg, strerror(errno));
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -475,8 +530,8 @@ void unix_error(char *msg)
|
|||
*/
|
||||
void app_error(char *msg)
|
||||
{
|
||||
fprintf(stdout, "%s\n", msg);
|
||||
exit(1);
|
||||
fprintf(stdout, "%s\n", msg);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -484,15 +539,15 @@ void app_error(char *msg)
|
|||
*/
|
||||
handler_t *Signal(int signum, handler_t *handler)
|
||||
{
|
||||
struct sigaction action, old_action;
|
||||
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 */
|
||||
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);
|
||||
if (sigaction(signum, &action, &old_action) < 0)
|
||||
unix_error("Signal error");
|
||||
return (old_action.sa_handler);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -501,8 +556,8 @@ handler_t *Signal(int signum, handler_t *handler)
|
|||
*/
|
||||
void sigquit_handler(int sig)
|
||||
{
|
||||
printf("Terminating after receipt of SIGQUIT signal\n");
|
||||
exit(1);
|
||||
printf("Terminating after receipt of SIGQUIT signal\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue