/*
* CheckJobs
*
* arguments: none
*
* returns: none
*
* Checks the status of running jobs.
*/
void
CheckJobs()
{
bgjobL* temp = donejobs; // grab header
if (temp == NULL) // no one in list
return;
do
{
temp->commands[strlen(temp->commands)] = 0;
temp->commands[strlen(temp->commands) - 1] = 0; // rid the ampersand
printf("[%d] Done %s\n", temp->status, temp->commands); //status doubling as index
fflush(stdout);
temp = temp->next;
} while (temp != NULL);
temp = donejobs;
do
{
removejob(temp, _DONELIST, 0);
temp = donejobs;
}
while (temp != NULL);
donejobs = NULL;
} /* CheckJobs */
void printjobs(struct job ** head) {
int i = 0;
int status;
struct job * current = *head;
// check if any job need to be printed
if (current == NULL) {
printf("No job in background.\n");
}
else{
printf("Jobs PID\tStatus\t\tJobs\n----------------------------------------------------------\n");
}
while (current != NULL) {
// print pid
printf("%i\t\t", current->pid);
// print status
int pid = current->pid;
waitpid(pid, &status, WNOHANG);
if(waitpid(pid, &status, WNOHANG) == -1){
printf("Done\t\t");
}
else {
printf("Working\t\t");
}
// print cmd
int j = 0;
while(current->args[j] != NULL){
printf("%s\t", current->args[j]);
j++;
}
printf("\n");
// check if the process is terminated
// if it is it is removed from the jobs list
current = current->next;
if(waitpid(pid, &status, WNOHANG) == -1){
removejob(head, pid);
}
}
}
/*
* RunBuiltInCmd
*
* arguments:
* commandT *cmd: the command to be run
*
* returns: none
*
* Runs a built-in command.
*/
static void
RunBuiltInCmd(commandT* cmd)
{
if (strcmp(cmd->argv[0], "pwd") == 0)
{
if (cmd->argc != 1) //something other than just pwd entered
PrintPError("The command pwd takes no arguments.");
else
Print(currentdir);
}
if (strcmp(cmd->argv[0], "cd") == 0) //cd needs to account for no argument, absolutes, and ..
{
// use cmd->argc (number or args including command cd) to switch between cases
if (cmd->argc >= 3) // too many args
PrintPError("The command cd takes one argument.");
else if (cmd->argc == 1) // no arguments given, chdir to HOME directory
{
if (chdir(getenv("HOME")) < 0)
PrintPError("Could not change directory.");
}
else
if (*cmd->argv[1] == '/') // absolute path
{
if (chdir(cmd->argv[1]) < 0)
PrintPError("Could not change directory.");
}
else if (*cmd->argv[1] == '.' && cmd->argv[1][1] == '.') // go back directories
{
char* tempPtr;
tempPtr = cmd->argv[1]; // ptr to walk over argument counting how many directories to go back
while (*tempPtr != '\0') // kind of a weak way to count, since we assume the user is putting periods
{
if (*tempPtr == '/') // skip the slashes
tempPtr++;
else
{
tempPtr += 2;
if (chdir("..") < 0) //go back one directory
PrintPError("Could not change directory.");
}
}
}
else // argument without . or / so chdir to currentdir + it
{
char* temp = (char*)malloc(500*sizeof(char));
strcpy(temp, currentdir);
strcat(temp, "/");
strcat(temp, cmd->argv[1]);
if (chdir(temp) < 0)
PrintPError("Could not change directory.");
free(temp);
}
}
if (strcmp(cmd->argv[0], "jobs") == 0)
{
bgjobL* temp = bgjobs;
while (temp != NULL)
{
if (temp->status) // running
{
char* commands = (char*)malloc(500*sizeof(char));
strcpy(commands, temp->commands);
if (commands[strlen(commands) - 1] != '&')
strcat(commands, " &");
printf("[%d] Running %s\n", temp->index, commands);
fflush(stdout);
free(commands);
}
else
{
//char* commands = (char*)malloc(500*sizeof(char));
//strcpy(commands, temp->commands);
printf("[%d] Stopped %s\n", temp->index, temp->commands);
fflush(stdout);
//free(commands);
}
temp = temp->next;
}
}
if (strcmp(cmd->argv[0], "bg") == 0)
{
if (cmd->argc > 2) // too many args
{
PrintPError("bg takes one or no arguments");
return;
}
//sigset_t chldsigset; // Initialize and set sigset for procmask
//sigemptyset(&chldsigset);
//sigaddset(&chldsigset, SIGCHLD);
//sigprocmask(SIG_BLOCK, &chldsigset, NULL); // mask SIGCHLDs
if (bgjobs != NULL)
{
bgjobL* temp;
if (cmd->argc == 1) // default
temp = getmostrecentjob();
else if (findjobindex(atoi(cmd->argv[1])))
temp = findjobindex( atoi(cmd->argv[1]) );
else
{
PrintPError("Index outside of job bounds");
return;
}
pid_t pid = temp->pid;
kill(-pid, SIGCONT); // Send SIGCONT to the job and all processes
temp->status = _RUNNING; // Set status to running
//sigprocmask(SIG_UNBLOCK, &chldsigset, NULL); //unmask
}
}
if (strcmp(cmd->argv[0], "fg") == 0)
{
if (cmd->argc > 2) // too many args
{
PrintPError("fg takes one or no arguments");
return;
}
//sigset_t chldsigset; // Initialize and set sigset for procmask
//sigemptyset(&chldsigset);
//sigaddset(&chldsigset, SIGCHLD);
//sigprocmask(SIG_BLOCK, &chldsigset, NULL); // mask SIGCHLDs
if (bgjobs != NULL)
{
bgjobL* temp;
if (cmd->argc == 1) // default
temp = getmostrecentjob();
else if (findjobindex(atoi(cmd->argv[1])))
temp = findjobindex( atoi(cmd->argv[1]) );
else
{
PrintPError("Index outside of job bounds");
return;
}
fgpid = temp->pid; // set fg to pid of job
strcpy(fgcommands, temp->commands); // copy commands to fgcommands
fgcommands[strlen(fgcommands) - 1] = 0;
if (temp->status == _STOPPED) // if stopped, SIGCONT it to get it running again
kill(-fgpid, SIGCONT);
// remove from job list
if ( !removejob(temp, _JOBLIST, 1) )
PrintPError("Not a job");
//sigprocmask(SIG_UNBLOCK, &chldsigset, NULL); //unmask
fgstatus = _RUNNING;
// Now wait on it with a busy loop
while (fgstatus)
{
sleep(1);
}
}
}
if (strcmp(cmd->argv[0], "alias") == 0){
aliasL* temp=aliaslist;
aliasL* previousalias=aliaslist;
if(cmd->argc==1)/* show all the alias */
{
if (temp == NULL) // start of list
{
;
}
else // something at start of list
{
while (TRUE)
{
if(temp!=NULL){
int i;
for( i = 0; temp->aliascmdline[i] != 0; ++i)
{
if(i==0)printf("alias ");
putchar(temp->aliascmdline[i]);
if(temp->aliascmdline[i]=='=')putchar('\'');
if(temp->aliascmdline[i+1]==0)puts("\'");
}
//printf("alias %s\n",temp->aliascmdline);
}
if (temp->next == NULL)
{
break;
}
temp = temp->next;
}
}
}
else{
aliasL* newalias = malloc(sizeof(aliasL)); // malloc memory for new alias
if (newalias == NULL){
PrintPError("Error in allocating memory for alias");
return;
}
// Initialize new alias
newalias->aliascmdline = (char*)malloc(strlen(cmd->argv[1]+1));
if (newalias->aliascmdline == NULL){
PrintPError("Error in allocating memory for alias");
return;
}
strcpy(newalias->aliascmdline, cmd->argv[1]);
newalias->next = NULL;
if (temp == NULL) // start of list
{
aliaslist=newalias;
}
else // something at start of list
{
while (TRUE)
{
if(strcmp(cmd->argv[1],temp->aliascmdline)<=0)//we find the small one, so insert it
{
if( previousalias!=aliaslist)previousalias->next=newalias;
newalias->next=temp;
if( previousalias==aliaslist)aliaslist=newalias;
break;
}
else if (temp->next == NULL)
{
temp->next = newalias;
break;
}
previousalias = temp;
temp = temp->next;
}
}
}
}
if (strcmp(cmd->argv[0], "unalias") == 0){
aliasL* temp=aliaslist;
aliasL* previousalias=aliaslist;
if(cmd->argc==1)// do nothing
{
;
}
else
{
while (TRUE)
{
if( ( temp != NULL ) && (strncmp(cmd->argv[1],temp->aliascmdline,strlen(cmd->argv[1]))==0) )// we find the alias, so unalias it
{
previousalias->next = temp->next;
if(temp==aliaslist)aliaslist=temp->next;
free(temp->aliascmdline);
free(temp);
break;
}
if ( ( temp == NULL ) || (temp->next == NULL) )
{
printf("%s: unalias: %s: not found\n",SHELLNAME,cmd->argv[1]);
//PrintPError(cmd->argv[1]);
break;
}
previousalias = temp;
temp = temp->next;
}
}
}
} /* RunBuiltInCmd */
