const char* disque::addjob(const char* name, const void* job, size_t job_len,
int timeout, const disque_cond* cond)
{
if (cond == NULL)
return addjob(name, job, job_len, timeout);
std::map<string, int> args;
int n = cond->get_replicate();
if (n > 0)
args["REPLICATE"] = n;
n = cond->get_delay();
if (n >= 0)
args["DELAY"] = n;
n = cond->get_retry();
if (n > 0)
args["RETRY"] = n;
n = cond->get_ttl();
if (n > 0)
args["TTL"] = n;
n = cond->get_maxlen();
if (n > 0)
args["MAXLEN"] = n;
if (cond->is_async())
args["ASYNC"] = 1;
return addjob(name, job, job_len, timeout, &args);
}
/*
* * 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 h
* * ave 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)
{
char *argv[MAXARGS];
int bg = parseline(cmdline, argv);
pid_t pid;
struct job_t *jb;
sigset_t mask;
if (argv[0] == NULL) return; //Ignoring the empty lines
if (!builtin_cmd(argv)) {
sigprocmask(SIG_BLOCK,&mask, NULL);
if((pid = fork()) == 0) {
sigprocmask(SIG_UNBLOCK,&mask,NULL);
setpgid(0,0);
if(execv(argv[0],argv)<0){
printf("%s : Command not found!! \n" , argv[0]);
exit(0);
}
}
if(!bg) {
addjob(jobs,pid,FG,cmdline);
sigprocmask(SIG_UNBLOCK,&mask,NULL);
waitfg(pid);
}
else{
addjob(jobs,pid,BG,cmdline);
sigprocmask(SIG_UNBLOCK,&mask,NULL);
jb = getjobpid(jobs,pid);
printf("[%d] (%d) %s", jb->jid, jb->pid,jb->cmdline);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
int isBG = parseline(cmdline, argv);
if (argv[0] == NULL) return;
if (builtin_cmd(argv)) return;
sigset_t allset;
sigfillset(&allset);
sigprocmask(SIG_BLOCK, &allset, NULL);
pid_t childpid = fork();
if (childpid == -1) unix_error("fork failed");
if (childpid == 0) {
sigprocmask(SIG_UNBLOCK, &allset, NULL);
if (setpgid(0, 0) == -1) unix_error("setpgrp failed");
if (execv(argv[0], argv) == -1) unix_error("execv failed");
}
if (isBG) {
addjob(jobs, childpid, BG, cmdline);
printjob(jobs, childpid);
sigprocmask(SIG_UNBLOCK, &allset, NULL);
} else {
addjob(jobs, childpid, FG, cmdline);
sigprocmask(SIG_UNBLOCK, &allset, NULL);
waitfg(childpid);
}
return;
}
/*
* 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)
{
// Kyung and Jung drove here
/* Outline taken from Bryant & O'Hall page 735 */
/* variables*/
char *argv[MAXARGS];
char buf[MAXLINE];
int bg;
pid_t pid;
struct job_t *addedjob;
sigset_t mask; /* for signals */
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
strcpy(buf,cmdline); /* parse command line */
bg = parseline(buf,argv);
/**************************
* evaluates command line
**************************/
if(argv[0] == NULL)
return;
if(!builtin_cmd(argv))
{ /* built-in command */
sigprocmask(SIG_BLOCK, &mask, NULL);
pid = fork();
if(pid < 0) { /* fork error handling */
unix_error("Fork error");
}
else if(pid==0) { /* child */
setpgid(0, 0);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
if(execve(argv[0], argv,environ) < 0) {
printf("%s: Command not found\n", argv[0]);
exit(1);
}
}
else { /* parent - not a build-in command */
if(bg) { /* run in background */
sigprocmask(SIG_UNBLOCK, &mask, NULL);
addjob(jobs, pid, BG, cmdline);
addedjob = getjobpid(jobs,pid);
printf("[%d] (%d) %s", addedjob->jid, addedjob->pid, addedjob->cmdline);
}
else { /* run in foreground */
sigprocmask(SIG_UNBLOCK, &mask, NULL);
addjob(jobs, pid, FG, cmdline);
waitfg(pid);
}
}
}
return;
/* done with code excerpt/outline */
// end of Kyung and Jung driving
}
/*
* 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.
*
* Requires:
* "cmdline" is a NUL ('\0') terminated string with a trailing
* '\n' character. "cmdline" must contain less than MAXARGS
* arguments.
*
* Effects:
* A built-in command is executed immediately. Otherwise, it attempts
* to fork a child process and execute the job. If necessary, the
* executable program is searched through the directories of the
* search path. If not found, an error is thrown. If the job is
* running as a foreground job, it waits until completion.
*/
static void
eval(const char *cmdline)
{
char *argv[MAXARGS];
int bg = parseline(cmdline, argv);
pid_t pid;
sigset_t mask;
// Checks command line is not empty.
if (!argv[0]) {
return;
}
// Checks that the command is not a built-in command.
if(!builtin_cmd(argv)){
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL);
// A child is forked.
pid = fork();
if (pid == 0) {
// Put child in new group whose ID is identical to child’s PID.
setpgid(0, 0);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
if (execve(argv[0], argv, environ) == -1) {
int index = 0;
// Run through directories in search path to execute program.
while (argv[0][0] != '.' && index < directoryCount) {
if (execve(strcat(directories[index],argv[0]), argv, environ) != -1) {
break;
}
index++;
}
// Command not found.
char *print;
asprintf(&print, "%s: Command not found\n", argv[0]);
sio_error(print);
}
}
if (bg == 0) {
addjob(jobs,pid,FG,cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
// Wait for foreground jobs to complete.
waitfg(pid);
}
else {
addjob(jobs,pid,BG,cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
printf("[%d] (%d) %s", pid2jid(pid), pid, cmdline);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
char buf[MAXLINE];
int bg;
sigset_t mask;
pid_t pid;
strcpy(buf, cmdline);
bg = parseline(buf, argv);
if(argv[0] == NULL)
return;
if(!builtin_cmd(argv)){
//block signal
if(sigemptyset(&mask) < 0)
unix_error("sigemptyset error");
if(sigaddset(&mask, SIGCHLD) < 0)
unix_error("sigaddset error");
if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
unix_error("sigprocmask error");
if((pid = fork()) == 0){
//set pid group to be the same as the current pid
if(setpgid(0,0) < 0)
unix_error("eval: set pid group error");
//unblock siganl
if(sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0)
unix_error("sigprocmask error");
//execute program
if(execve(argv[0], argv, environ)<0){
printf("%s: Command not found.\n", argv[0]);
exit(1);
}
}
if(!bg){
addjob(jobs, pid, FG, cmdline);
//unblock siganl
if(sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0)
unix_error("sigprocmask error");
waitfg(pid);
}else{
addjob(jobs, pid, BG, cmdline);
//unblock siganl
if(sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0)
unix_error("sigprocmask error");
printf("[%d] (%d) %s", pid2jid(pid), pid, cmdline);
}
}
return;
}
/*
* 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)
{
char* argvTask[MAXARGS]; // holds arguments for other calls
pid_t npid; // new pid temp var
sigset_t mask;
parseline(cmdline, argvTask);
if(builtin_cmd(argvTask)){} // check for a built in and runs immediately
else // reaches for non-built in
{
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL); // enable mask for parent
if(parseline(cmdline, argvTask)) //checking if BG
{
if(( npid = fork()) == 0) // child run in bg
{
sigprocmask(SIG_UNBLOCK, &mask, NULL); // unblock mask for child
setpgid(0,0);
if(execve(argvTask[0], argvTask, environ) < 0)
{
//unix_error( argvTask[0]);
printf("%s: Command not found \n",argvTask[0]);
exit(0);
}
}
else // parent
{
addjob(jobs, npid,BG, cmdline); // add bg job to list and parent does not wait
printf( "[%d] (%d) %s", maxjid(jobs) , npid , cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL); // unblock the parent
}
}
else // runs if FG
{
if(( npid = fork()) == 0) // child run in fg
{
sigprocmask(SIG_UNBLOCK, &mask, NULL); // unblock child
setpgid(0,0);
if(execve(argvTask[0], argvTask, environ) < 0) // use exec call and check for error
{
printf("%s: Command not found \n",argvTask[0]);
exit(0);
}
}
else // parent
{
addjob(jobs, npid,FG,cmdline); // adding the fg job to jobs list
sigprocmask(SIG_UNBLOCK, &mask, NULL); // unblock the parent
waitfg(npid); //waiting for fg process to finish
}
}
}
return;
}
/*
* 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)
{
char * argv[MAXARGS];
int bg = parseline(cmdline, argv);
int rbic = builtin_cmd(argv);
if (!rbic)
{
pid_t child = fork();
//printf("forked\n");
if (child)
{
//PARENT
if (bg)
{
int ret = addjob(jobs, child, BG, cmdline); //returns an int
if (ret)
{
int jid = pid2jid(child);
printf("[%d] (%d) %s", jobs[jid-1].jid, jobs[jid-1].pid, jobs[jid-1].cmdline);
}
else
{
printf("addjobfailed\n");
}
}
else
{
int ret = addjob(jobs, child, FG, cmdline); //returns an int
if (!ret)
{
printf("addjobfailed\n");
}
waitfg(child);
}
}
else if( child < 0 )
{
//ERROR
exit(1);
}
else
{
//CHILDS
setpgid( 0, 0 );
int rc = execv( argv[0], argv );
if (rc == -1)
{
printf( "execv error %d\n", errno);
exit(1);
}
}
}
return;
}
/*
* Exec
*
* arguments:
* commandT *cmd: the command to be run
* bool forceFork: whether to fork
*
* returns: none
*
* Executes a command.
*/
static void
Exec(char *abspath, commandT* cmd, bool forceFork)
{
if (!forceFork) {
if (execv(abspath, cmd->argv) < 0)
printf("%s not found", cmd->argv[0]);
return;
}
sigset_t mask;
pid_t pid;
bool bg;
struct job_t *curr;
char buf[MAXLINE];
int i = 1;
int status;
if (sigemptyset(&mask) != 0) {
perror("sigemptyset error");
}
if (sigaddset(&mask, SIGCHLD) != 0) {
perror("sigaddset error");
}
if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0) {
perror("sigprocmask error");
}
strncpy(buf, cmd->argv[0], MAXLINE);
if (*cmd->argv[cmd->argc - 1] == '&') {
cmd->argv[--cmd->argc] = NULL;
bg = 1;
} else
bg = 0;
jobListToString(cmd->argv, 0, cmd->argc, buf);
if ((pid = fork()) < 0) {
perror("fork error");
} else if (pid == 0) {
if (sigprocmask(SIG_UNBLOCK, &mask, NULL) != 0) {
perror("sigprocmask error");
}
if (setpgid(0, 0) < 0) {
perror("setpgid error");
}
if (execv(abspath, cmd->argv) < 0)
printf("%s not found", cmd->argv[0]);
} else {
if (sigprocmask(SIG_UNBLOCK, &mask, NULL) != 0) {
perror("sigprocmask error");
}
if (bg)
addjob(jobs, pid, BG, buf);
else {
addjob(jobs, pid, FG, buf);
waitpid(pid, &status, WUNTRACED);
if (!WIFSTOPPED(status))
deletejob(jobs, pid);
}
}
} /* Exec */
/*
* 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)
{
// Get memory for our parsed input
char temp[MAXLINE];
char** argv = (char**)temp;
// Return if only newline
if (strcmp(cmdline, "\n") == 0) {
return;
}
// Parse the input
int background = parseline(cmdline, argv);
// Check if built in command
if (builtin_cmd(argv) == 0) {
// Not a built in command
char* programName = argv[0];
// Block sigchild signal
sigset_t mask;
Sigemptyset(&mask);
Sigaddset(&mask, SIGCHLD);
Sigprocmask(SIG_BLOCK, &mask, NULL);
// Create a child process
pid_t pid = Fork();
// Unblock sichild signal
Sigprocmask(SIG_UNBLOCK, &mask, NULL);
if (pid == 0) {
// Child
// Assign it a new process group id
setpgid(0,0);
// Run the external program
Execve(programName, argv, environ);
}
else {
// Parent
if (background == 0) {
// Add it to the list
addjob(jobs, pid, FG, cmdline);
// Make the shell wait for the process in the fg
waitfg(pid);
}
else {
// Add it to the list
addjob(jobs, pid, BG, cmdline);
// Get the job id
int jid = pid2jid(pid);
// Print info on background job
printf("[%d] (%d) %s", jid, pid, cmdline);
}
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS]; //args for execvp
pid_t pid;
sigset_t sSet;
int stat;
if (*cmdline == 10)
return;
else{
stat= parseline(cmdline, argv);
if (argv[0] == NULL)
return; /* ignore empty lines */
if(!builtin_cmd(argv)){ //If it is not a user command
sigemptyset(&sSet);
sigaddset(&sSet,SIGCHLD);
sigprocmask(SIG_BLOCK, &sSet,NULL);
if((pid = fork()) == 0) { /*Child runs user job*/
setpgrp();
sigprocmask(SIG_UNBLOCK, &sSet,NULL); /*Unblocked after setpgrp() because childpid should be set as group pid first without any interruption */
int stat1=execvp(argv[0], argv); //prints a message if execvp fails.
if(stat1 < 0) { //If the command doesnot exists
stat1=0;
printf("%s: Command not found.\n",argv[0]);//prints a message if execvp fails.
exit(0); /*In case execvp fails then exit will get called.*/
}
}
if(stat) {
addjob(jobs, pid, BG, cmdline); /* request for background job then job is added with BG state*/
sigprocmask(SIG_UNBLOCK,&sSet,NULL); /*unblocks signal after adding all jobs without any type of signal*/
printf("[%d] (%d) %s",pid2jid(pid),pid,cmdline);
}
else
{
addjob(jobs, pid, FG, cmdline) ;
sigprocmask(SIG_UNBLOCK,&sSet,NULL);/*unblocks signal after adding all jobs without any type of signal*/
waitfg(pid);/*parent waits*/
}
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
//int to record for bg
int bg;
pid_t pid;
sigset_t mask;
// parse the line
bg = parseline(cmdline, argv);
//check if valid builtin_cmd
if(!builtin_cmd(argv)) {
// blocking first
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL);
// forking
if((pid = fork()) < 0){
unix_error("forking error");
}
// child
else if(pid == 0) {
sigprocmask(SIG_UNBLOCK, &mask, NULL);
setpgid(0, 0);
//check if command is there
if(execvp(argv[0], argv) < 0) {
printf("%s: Command not found\n", argv[0]);
exit(1);
}
}
// parent add job first
else {
if(!bg){
addjob(jobs, pid, FG, cmdline);
}
else {
addjob(jobs, pid, BG, cmdline);
}
sigprocmask(SIG_UNBLOCK, &mask, NULL);
//if bg/fg
if (!bg){
//wait for fg
waitfg(pid);
}
else {
//print for bg
printf("[%d] (%d) %s", pid2jid(pid), pid, cmdline);
}
}
}
}
/*
* 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)
{
char *argv[MAXARGS];
int bg;
pid_t pid;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
bg=parseline(cmdline, argv);
if(!builtin_cmd(argv)){
sigprocmask(SIG_BLOCK, &mask, 0);
/* Fork */
if((pid=fork())<0){
unix_error("fork error");
return;
}
/* Child process */
else if(pid==0){
if(setpgid(0,0)<0) unix_error("setpgid error");
if (execvp(argv[0], argv) < 0) {
printf("%s: Command not found. \n", argv[0]);
exit(0);
}
}
/* Parent process */
else{
if(bg==1){
addjob(jobs, pid, BG, cmdline);
sigprocmask(SIG_UNBLOCK, &mask, 0);
printf("[&d] (%d) %s", pid2jid(pid), pid, cmdline);
}
else{
addjob(jobs, pid, FG, cmdline);
sigprocmask(SIG_UNBLOCK, &mask, 0);
waitfg(pid);
}
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
char buf[MAXLINE];
int bg;
pid_t pid;
sigset_t mask;
strcpy(buf,cmdline);
bg = parseline(buf,argv);
if (argv[0] == NULL)
return;
if (!builtin_cmd(argv))
{
sigemptyset(&mask);
sigaddset(&mask,SIGCHLD);
sigprocmask(SIG_BLOCK,&mask,NULL);
if ((pid = fork()) < 0)
{
perror("fork");
exit(0);
}
else if (pid == 0)
{
sigprocmask(SIG_UNBLOCK,&mask,NULL);
if (execvp(argv[0], argv) < 0)
{
printf("%s : Command not found.\n", argv[0]);
exit(0);
}
}
if (bg)
addjob(jobs,pid,BG,buf);
else
addjob(jobs,pid,FG,buf);
sigprocmask(SIG_UNBLOCK,&mask,NULL);
if (!bg)
{
waitfg(pid);
}
else
{
printf("%d %s",(int)pid, cmdline);
}
}
return;
}
/*
* 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)
{
/* the following code demonstrates how to use parseline --- you'll
* want to replace most of it (at least the print statements). */
int i, bg, job_loc;
char *argv[MAXARGS];
bg = parseline(cmdline, argv);
if (bg) {
// printf("background job requested\n");
}
for (i=0; argv[i] != NULL; i++) {
// printf("argv[%d]=%s%s", i, argv[i], (argv[i+1]==NULL)?"\n":", ");
}
if (builtin_cmd(&argv[0]) == 0){
return;
}else{
int pid;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL);
if((pid=fork())==0){
setpgid(0, 0);
if(execvp(argv[0], argv)< 0){
printf("Command not found\n");
deletejob(jobs, pid);
exit(0);
}
}
if (!bg){
job_loc=addjob(jobs,pid,FG,cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
waitfg(pid);
}
else{
job_loc=addjob(jobs,pid,BG,cmdline);
printf("[%d] (%d) %s",job_loc, pid, cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
}
return;
}
}
void eval(char *cmdline)
{
char *argv[MAXARGS];
int argc = 0;
int bg = parseline(cmdline, argv, &argc);
pid_t pid = -1;
sigprocmask(SIG_BLOCK,&maskchld,NULL);
if(builtin_cmd(argv,argc)) return;
if(bg)
{
pid = Fork();
if(pid==0) {
setpgid(0,0);
sigprocmask(SIG_UNBLOCK,&maskchld,NULL);
Signal(SIGINT, SIG_DFL);
Signal(SIGTSTP, SIG_DFL);
if(execv(argv[0], argv) < 0) {
printf("%s: Command not found\n",argv[0]);
exit(0);
}
return;
}
addjob(jobs,pid,BG,cmdline);
struct job_t* job = getjobpid(jobs,pid);
printf("[%d] (%d) ", job->jid, job->pid);
printf("%s", job->cmdline);
sigprocmask(SIG_UNBLOCK,&maskchld,NULL);
}
else {
pid=Fork();
if(pid==0){
setpgid(0,0);
sigprocmask(SIG_UNBLOCK,&maskchld,NULL);
Signal(SIGTSTP,SIG_DFL);
Signal(SIGINT,SIG_DFL);
if(execv(argv[0],argv) < 0){
printf("%s: Command not found\n",argv[0]);
exit(0);
}
}
addjob(jobs,pid,FG,cmdline);
sigprocmask(SIG_UNBLOCK,&maskchld,NULL);
waitfg(pid);
return;
}
return;
}
/*
* 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)
{
int bg; /* should the job run in bg or fg? */
struct cmdline_tokens tok;
struct job_t *jobinfo;
pid_t pid;
sigset_t wait;
/* Parse command line */
bg = parseline(cmdline, &tok);
if (bg == -1) /* parsing error */
return;
if (tok.argv[0] == NULL) /* ignore empty lines */
return;
if(!buildinCmd(&tok)){
blockAllSignal();
if((pid = fork()) == 0){
//child
if(setpgid(0, 0) < 0){
unix_error("process set prcess group error\n");
}
IORedirect(&tok);
unblockAllSignal();
if(execve(tok.argv[0], tok.argv, environ) == -1){
printf("%s, command not found\n", tok.argv[0]);
exit(0);
}
}else{
//parent
if(!bg){
addjob(job_list, pid, FG, cmdline);
sigemptyset(&wait);
sigsuspend(&wait);
unblockAllSignal();
while(fgpid(job_list) != 0)
{
sigsuspend(&wait);
}
}else{
addjob(job_list, pid, BG, cmdline);
jobinfo = getjobpid(job_list, pid);
printf("[%d] (%d) %s\n", jobinfo->jid, jobinfo->pid, jobinfo->cmdline);
unblockAllSignal();
}
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
int bg=parseline(cmdline,argv);
int p=builtin_cmd(&argv[0]);
int childpid;
bg++; //because the background process is defined as 2 and foreground as 1
sigset_t set;
sigemptyset(&set);
sigaddset(&set,SIGCHLD);
sigaddset(&set,SIGINT);
sigaddset(&set,SIGTSTP);
if(!p)
{
if((childpid=fork())==0)
{
setpgid(0,0); //Changing group id
execve(argv[0], argv, NULL);
printf("Command not found\n");//If incase there is no command
exit(0);
}
else
{
sigprocmask(SIG_BLOCK,&set,NULL); //masking if incase child executes first
addjob(jobs,childpid,bg,cmdline);
sigprocmask(SIG_UNBLOCK,&set,NULL);//remove mask
if(bg==1)
waitfg(childpid);
else
printf("[%d] (%d) %s",pid2jid(childpid),childpid,cmdline);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS]; /* argv for execve() */
int bg;
pid_t pid;
bg = parseline(cmdline, argv);
if(argv[0] == NULL) return; /* ignore empty lines */
if(!builtin_cmd(argv))
{
if((pid = fork()) < 0) unix_error("eval(): fork() error");
if(pid == 0) /* child runs user job */
{
if(setpgid(0,0) < 0) unix_error("eval(): setpgid() error");
if(execve(argv[0], argv, environ) < 0)
{
printf("%s: Command not found.\n", argv[0]);
exit(0);
}
}
addjob(jobs,pid,(bg == 1 ? BG : FG),cmdline);
sigprocmask(SIG_UNBLOCK,&mask,NULL);
if(!bg) waitfg(pid);
else printf("[%d] (%d) %s",pid2jid(pid),pid,cmdline);
}
return;
}
/*function used to run user command using execvp*/
void run(char *input,char *usrcmdargs[],int is_background){
int pid1;
pid1=fork();
struct job_t *tempjob_list;
if(pid1 == 0){
close(fdin);
close(fdout);
//execvp return -1 if command do not exist, if it is successful, it do not return any value
err=execvp(usrcmdargs[0],usrcmdargs);
printf("errno is %d\n", errno);
if(err == -1){
printf("command do not exist\n");
exit(EXIT_FAILURE);
}
exit(0);
}
else if(is_background != 0){
addjob(job_list,pid1,BKG,input);
tempjob_list=getjob(job_list,pid1);
printf("[%d] %d running in background\n",tempjob_list->jid,pid1);
}
else{
//addjob(job_list,pid1,FRG,input);
waitpid(pid1,&status, 0);
}
}
/*
* handle the parent process
*/
void
handle_parent_process(struct cmdline_tokens* toks, int bg,
pid_t pid, sigset_t* oldset, char* cmdline)
{
sigset_t emptyset;
if(!addjob(job_list, pid, bg?BG:FG, cmdline)){
unix_error("error in addjob");
}
struct job_t* job = getjobpid(job_list, pid);
if(!bg){
if(sigprocmask(SIG_SETMASK, oldset, NULL)){
unix_error("error in parent process's sigprocmask");
}
if(sigemptyset(&emptyset)){
unix_error("set is not empty");
}
while(fgpid(job_list) && job -> state == FG)
sigsuspend(&emptyset);
} else {
printf("[%d] (%d) %s\n", job->jid,
job->pid, job->cmdline);
if(sigprocmask(SIG_SETMASK, oldset, NULL)){
unix_error("error in parent process's sigprocmask");
}
}
}
/*
* 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)
{
char *argv[MAXARGS];
/* int ground = parseline(cmdline, (char **)&argv); */
char buf[MAXLINE]; // Holds modified command line
strcpy(buf, cmdline);
int ground = parseline(buf, argv);
if (argv[0] == NULL) return;
if (!builtin_cmd((char **)&argv)) {
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL);
pid_t pid = __fork();
if (pid != 0) {
addjob(jobs, pid, ground ? BG : FG, cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
if (!ground) waitfg(pid);
else printf("[%d] (%d) %s", pid2jid(pid), pid, cmdline);
} else {
__setpgid(0, 0);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
if (execve(argv[0], argv, environ) < 0) {
printf("%s: Command not found\n", argv[0]);
exit(0);
}
}
}
return;
}
int main(int argc, char **argv)
{
int pid;
sigset_t mask;
Signal(SIGCHLD, handler);
initjobs(); /* Initialize the job list */
while (1) {
Sigemptyset(&mask);
Sigaddset(&mask, SIGCHLD);
Sigprocmask(SIG_BLOCK, &mask, NULL); /* Block SIGCHLD */
/* Child process */
if ((pid = Fork()) == 0) {
Sigprocmask(SIG_UNBLOCK, &mask, NULL); /* Unblock SIGCHLD */
Execve("/bin/ls", argv, NULL);
}
/* Parent process */
addjob(pid); /* Add the child to the job list */
Sigprocmask(SIG_UNBLOCK, &mask, NULL); /* Unblock SIGCHLD */
}
exit(0);
}
/*
* 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)
{
char *argv[MAXARGS];
char buf[MAXLINE];
int bg = 0;
pid_t pid;
int status = 0;
strcpy(buf, cmdline);
bg = parseline(buf, argv);
if(argv[0] == NULL){
return ;
}
#ifdef DEBUG_MSG_EVAL
printf("cmdline is %s\n",cmdline);
fflush(stdout);
#endif
if(!builtin_cmd(argv)){
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, NULL);
if((pid = fork()) == 0){
sigprocmask(SIG_UNBLOCK, &mask, NULL);
setpgid(0,0);
if(execve(argv[0], argv, environ) < 0){
printf("%s: Command not found\n", argv[0]);
exit(0);
}
}
if(!bg){
status = FG;
addjob(jobs,pid,status, cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
waitfg(pid);
}else{
status = BG;
addjob(jobs,pid,status, cmdline);
printf("[%d] (%d) %s", getjobpid(jobs, pid)->jid, pid, cmdline);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
// Parse command line.
int isbg = parseline(cmdline, argv);
pid_t pid;
struct job_t *tmpjob;
// Set sigset_t.
sigset_t sig;
sigemptyset(&sig);
sigaddset(&sig, SIGCHLD);
if( argv[0] == NULL ) // If input has no string, then return.
return;
if(!builtin_cmd(argv)) { // When cmdline is not builtin command.
sigprocmask(SIG_BLOCK, &sig, NULL); // block SIGCHLD
if( (pid = fork()) < 0) // When fork error occurs.
return;
else if( pid == 0 ) { //Child
setpgid(0, 0);
sigprocmask(SIG_UNBLOCK, &sig, NULL); // unblock SIGCHLD
if(execve(argv[0], argv, environ) < 0) { // If command not found.
printf("%s: Command not found\n", argv[0]);
exit(0);
}
}
else { // Parent
if(isbg) { // When background
addjob(jobs, pid, BG, cmdline); // Add to joblist(with state: BG)
tmpjob = getjobpid(jobs, pid);
printf("[%d] (%d) %s", tmpjob->jid, tmpjob->pid, tmpjob->cmdline);
sigprocmask(SIG_UNBLOCK, &sig, NULL); // unblock SIGCHLD.
}
else { // foreground
addjob(jobs, pid, FG, cmdline); // Add to joblist with state is FG.
sigprocmask(SIG_UNBLOCK, &sig, NULL); // unblock SIGCHLD
waitfg(pid); // wait foreground job.
}
}
}
return;
}
/*
* 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.
* 70 lines
*/
void eval(char *cmdline)
{
char * argv[MAXARGS];
char buf[MAXLINE];
int bg = 0;
sigset_t mask;
pid_t pid = 0;
strcpy(buf, cmdline);
bg = parseline(buf,argv);
if(argv[0] == NULL) return; // ignore empty line
if(!builtin_cmd(argv))
{
if(sigemptyset(&mask) <0) unix_error("sigemptyset error");
if(sigaddset(&mask, SIGCHLD) <0) unix_error("sigaddset error");
if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0) unix_error("sigprocmask error block");
pid = fork();
if (pid < 0) unix_error("fork error");
else if((pid == 0))//child process
{
if(setpgid(0,0) < 0)
unix_error("setpgid error");
if(sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0) unix_error("sigprocmask error unblock");
if(execve(argv[0],argv,environ) < 0)//run task
{
printf("%s: Command not found\n", argv[0]);
exit(0);
}
}
if(bg)
{
printf("[%d] (%d) %s",nextjid, pid, cmdline);
addjob(jobs,pid,BG,cmdline);
}
else addjob(jobs,pid,FG,cmdline);
if(sigprocmask(SIG_UNBLOCK, &mask, NULL)<0) unix_error("sigprocmask error unblock");
if(!bg)
{
waitfg(pid);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
memset(argv, 0, sizeof(void*) * MAXARGS);
int bg = parseline(cmdline, argv);
if(!argv[0]) return;
if(builtin_cmd(argv)) return;
//printf("%s\n", argv[0]);
sigset_t mask,mask_all,prev_mask;
sigemptyset(&mask);
sigfillset(&mask_all);
sigaddset(&mask,SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, &prev_mask);
pid_t pid = fork();
//Run the job in child process
if(pid == 0)
{
setpgid(pid,pid);
sigprocmask(SIG_SETMASK, &prev_mask, NULL);
int result = execve(argv[0],argv,environ);
if(result)
{
fprintf(stderr,"%s: Command not found\n", argv[0]);
exit(0);
}
}
//Parent process
else
{
sigprocmask(SIG_BLOCK, &mask_all, NULL);
if(bg)
{
addjob(jobs,pid,BG,cmdline);
printf("[%d] (%d) %s", jobs->jid, pid, cmdline);
sigprocmask(SIG_SETMASK, &prev_mask,NULL);
}
else{
addjob(jobs,pid,FG,cmdline);
sigprocmask(SIG_SETMASK, &prev_mask, NULL);
waitfg(pid);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];//argv will hold all of the parsed args
pid_t pid;
sigset_t mask;
int background_job = parseline(cmdline, argv); //returns 1 if bg
if(argv[0] == NULL){//no input
return;
}
int builtin_job = builtin_cmd(argv); //returns 0 if not built in
if(!builtin_job){
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK,&mask,NULL);
pid = fork();
if(pid == 0){ //child
setpgid(0,0);
sigprocmask(SIG_UNBLOCK,&mask,NULL);
if(execvp(argv[0], argv) < 0){
printf("%s: Command not found.\n", argv[0]);
exit(0);
}
}
else{//parent
if(background_job){
addjob(jobs, pid, BG, cmdline);
printf("[%d] (%d) %s", pid2jid(pid), pid, cmdline);
}
else{
addjob(jobs, pid, FG, cmdline);
}
sigprocmask(SIG_UNBLOCK,&mask,NULL);
if(!background_job){//wait until job is done
waitfg(pid); //stuck
}
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
char buf[MAXLINE];
int bg;
pid_t pid;
strcpy(buf,cmdline);
bg=parseline(buf,argv);
if(argv[0]==NULL)
return;
if(!builtin_cmd(argv))
{
sigset_t mask;
sigemptyset(&mask);
sigprocmask(SIG_BLOCK,&mask,NULL);
if((pid=fork())==0)
{
sigprocmask(SIG_UNBLOCK,&mask,NULL);
if(execve(argv[0],argv,NULL)<0){
printf("%s: Command not found\n",argv[0]);
exit(0);
}
}
if(!bg)
{
if(setpgid(pid,pid)<0)
unix_error("setpgid: setpgid error");
if(!addjob(jobs,pid,FG,buf))
app_error("addjob: addjob error");
sigprocmask(SIG_UNBLOCK,&mask,NULL);
waitfg(pid);
}
else
{
if(setpgid(pid,pid)<0)
unix_error("setpgid: setpgid error");
if(!addjob(jobs,pid,BG,buf))
app_error("addjob: addjob error");
sigprocmask(SIG_UNBLOCK,&mask,NULL);
printf("[%d] (%d) %s",getjobpid(jobs,pid)->jid,pid,cmdline);
}
}
return;
}
/*
* 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)
{
char *argv[MAXARGS];
int bg;
pid_t pid;
sigset_t signals;
bg = parseline(cmdline, argv);
if (argv[0] == NULL)
return;
if (bg != -1 && !builtin_cmd(argv))
{
sigemptyset(&signals);
sigaddset(&signals, SIGCHLD);
sigprocmask(SIG_BLOCK, &signals, NULL);
if ((pid = fork()) == 0)
{
if (setpgid(0, 0) < 0)
unix_error("setpgid failed");
if (execve(argv[0], argv, environ) < 0)
{
printf("%s: Command not found\n", argv[0]);
exit(0);
}
}
if (!bg)
addjob(jobs, pid, FG, cmdline);
else
addjob(jobs, pid, BG, cmdline);
sigprocmask(SIG_UNBLOCK, &signals, NULL);
if (!bg)
waitfg(pid);
else
printf("[%d] (%d) %s", pid2jid(pid), pid, cmdline);
}
return;
}
