void freeCommand(Command* c)
{
if (c->_com) free(c->_com);
if (c->_input) free(c->_input);
if (c->_output) free(c->_output);
for(int i=0;i < c->_nba;i++)
if (c->_args[i]) free(c->_args[i]);
free(c->_args);
for(int j=0;j<c->_nbs;j++)
freeStage(c->_stages[j]);
if (c->_stages) free(c->_stages);
free(c);
}
/** The main thing.
* @param argc count of command-line tokens.
* @param argv array of command-line tokens.
* @return 0 on success, 1-255 on failure.
*/
int main(int argc, char* argv[]){
struct stat stattemp;
int fd;
bool done = FALSE;
char* commandLine;
int* status;
stageStruct** pStages;
int** pipefd = NULL;
numOfPid = 0;
pid = NULL;
running = NULL;
status = NULL;
struct sigaction my_act; //new signal response
struct sigaction old_act; //old signal response
//signal stuff
if(sigemptyset(&(my_act.sa_mask)) == -1){
fprintf(stderr, "mush: sigemptyset\n");
_exit(EXIT_FAILURE);
}
/*behavior modification of signals*/
my_act.sa_flags = 0;
my_act.sa_handler = sighandler;
if(sigaction(SIGINT, &my_act, &old_act) == -1){
fprintf(stderr, "mush: sigaction\n");
_exit(EXIT_FAILURE);
}
//handles arguments
if(argc >= 3){
fprintf(stderr, "Usage: mush [file]\n");
}
else if(argc == 2){
fd = open(argv[1], O_RDONLY);
if(fd == -1){
fprintf(stderr,"error on open(%s, O_RDONLY)\n",argv[1]);
}
if(dup2(fd, STDIN_FILENO) == -1){
fprintf(stderr,"error on dup2(fd, STDIN_FILENO)\n");
_exit(EXIT_FAILURE);
}
close(fd);
}
//THE while loop
while(!done){
//prompt
if(isatty(fileno(stdin)) && isatty(fileno(stdout))){
printf("8-P ");
fflush(stdout);
}
//get the command
commandLine = getLine(stdin);
//exit if EOF is sent
if(feof(stdin)){
break;
}
if((commandLine == NULL) || (strlen(commandLine) == 0)){
continue;
}
//parse the command into stage structs
pStages = parseline(commandLine);
if(pStages == NULL){
continue;
}
//checking to see if it's a cd command
if(strcmp(pStages[0]->argvv[0], "cd") == 0){
if(pStages[0]->argcc == 1){
if(chdir(getenv("HOME")) == -1){
fprintf(stderr,"chdir failed (chdir(HOME))\n");
}
}
else{
if(chdir(pStages[0]->argvv[1]) == -1){
fprintf(stderr,"chdir failed\n");
}
}
freeStage(pStages,NULL);
continue;
}
//copy the number of stages
numOfPid = pStages[0]->totalStageNumber;
//start mallocing everything
pid = (pid_t*)malloc(sizeof(pid_t)*numOfPid);
running = (bool*)malloc(sizeof(bool)*numOfPid);
status = (int*)malloc(sizeof(int)*numOfPid);
pipefd = (int**)malloc(sizeof(int*)*(numOfPid));
//mallocing each file descriptors, in and out
for(int i = 0; i < numOfPid; i++){
pipefd[i] = (int*)malloc(sizeof(int)*2);
}
//setting each of the running state to false
for(int i = 0; i < numOfPid; i++){
running[i] = FALSE;
}
for(int i = 0; i < numOfPid; i++){
if(pipe(pipefd[i]) == -1){
fprintf(stderr,"mush: pipe errer");
close(pipefd[i][0]);
close(pipefd[i][1]);
continue;
}
}
//special case for first pipe in
if(pStages[0]->input != NULL){
pipefd[0][0] = open(pStages[0]->input, O_RDONLY);
fprintf(stderr,"pipefd[0][0] == %d\n",pipefd[0][0]);
if(pipefd[0][0] == -1){
fprintf(stderr,"mush: %s: No such file or directory\n",pStages[0]->input);
freeStuff(status,pipefd,running,pid,numOfPid);
freeStage(pStages,NULL);
continue;
}
}
else{
pipefd[0][0] = STDIN_FILENO;
}
//special case for last pipe for out
if(pStages[numOfPid-1]->output != NULL){
if((stat(pStages[numOfPid-1]->output, &stattemp) == 0 && !(S_ISDIR(stattemp.st_mode))) || errno == ENOENT){
pipefd[numOfPid-1][1] = open(pStages[numOfPid-1]->output, (O_WRONLY|O_CREAT|O_TRUNC), S_IRUSR|S_IWUSR);
fprintf(stderr,"pipefd[numOfPid-1][1] == %d\n",pipefd[numOfPid-1][1]);
if(pipefd[numOfPid-1][1] == -1){
fprintf(stderr,"file open failed with : %s",pStages[numOfPid-1]->output);
close(pipefd[numOfPid-1][0]);
freeStuff(status,pipefd,running,pid,numOfPid);
freeStage(pStages,NULL);
continue;
}
}
else{
//file is a directory
fprintf(stderr,"This is a directory\n");
close(pipefd[numOfPid-1][0]);
freeStuff(status,pipefd,running,pid,numOfPid);
freeStage(pStages,NULL);
continue;
}
}
else{
pipefd[numOfPid-1][1] = STDOUT_FILENO;
}
for(int i = 0; i < numOfPid; i++){
//now start duping and closing the file descriptors
running[i] = TRUE;
pid[i] = fork();
//something went wrong
if(pid[i] == -1){
fprintf(stderr,"mush: fork error\n");
close(pipefd[i][0]);
close(pipefd[i][1]);
freeStuff(status,pipefd,running,pid,numOfPid);
freeStage(pStages,NULL);
continue;
}
//this is the child
else if(pid[i] == 0){
//make mushit killable by SIGINT
if(sigaction(SIGINT, &old_act, NULL) == -1){
}
if(i == 0 && numOfPid == 1){
}
if(numOfPid != 1){
dup2(pipefd[i][1],STDIN_FILENO);
if(i == (numOfPid-1)){
//fprintf(stderr,"STDOUT_FILENO=%d\n",STDOUT_FILENO);
//dup2(1,STDOUT_FILENO);
}
else{
dup2(pipefd[i+1][0],STDOUT_FILENO);
}
}
if(execvp(pStages[i]->argvv[0], pStages[i]->argvv) == -1){
fprintf(stderr,"execvp failed with : %s\n",pStages[i]->argvv[0]);
freeStuff(status,pipefd,running,pid,numOfPid);
freeStage(pStages,NULL);
_exit(EXIT_FAILURE);
}
fprintf(stderr,"------------------\n");
}
//close if not std
if(i != 0){
close(pipefd[i][0]);
}
if(i != numOfPid-1){
close(pipefd[i][1]);
}
}
//end of the for loop
//and now we wait for all the child to come back
for(int i = 0; i < numOfPid; i++){
if(waitpid(pid[i], &status[i], 0) == -1){
if(WIFSIGNALED(status[i])){
if(WTERMSIG(status[i]) != SIGINT){
//fprintf(stderr, "mush: waitpid signaled error %d\n", WTERMSIG(status[i]));
}
}
}
running[i] = FALSE;
}
freeStage(pStages,NULL);
freeStuff(status,pipefd,running,pid,numOfPid);
}
//the very long while loop ends here
free(commandLine);
fprintf(stdout,"Good Bye.\n");
return EXIT_SUCCESS;
}