int
main(void)
{
char* cmdLine;
while(1){
printf("JXYShell$ -");
cmdLine = readline("> ");
history(cmdLine);
//scanf("%s", cmdLine);
//printf("%s",cmdLine);
//int num = piping(cmdLine);
//printf("NUM:%d ", num);
//parse(cmdLine);
executeCommand(piping(cmdLine));
//if (!strcmp(cmdLine, "exit")){
// exit(SUCCESS);
//}
/*if (cmdLine != NULL){
history(cmdLine);
executeCommand(cmdLine);
}else{*/
//}
}
return SUCCESS;
}
/* Fork and execute _args[cmds[z]] */
int fexec(int z, int* oldPipe, int* newPipe){
pid = fork();
piping(pid, oldPipe, newPipe);
if(!pid) {
/* In child */
execvp(_args[cmds[z]], &_args[cmds[z]]);
fprintf(stderr, "Child: Execution of %s failed.\n", _args[cmds[z]]);
switch(errno){
case ENOTDIR:
fprintf(stderr, "\tA component of the path prefix is not a directory.\n"); break;
case ENOENT:
fprintf(stderr, "\tThe process file does not exist.\n"); break;
case EFAULT:
fprintf(stderr, "\tBad path, argv or envp.\n"); break;
case E2BIG:
fprintf(stderr, "\tArg list is too long.\n"); break;
case ENOMEM:
fprintf(stderr, "\tOut of memory.\n"); break;
case EIO:
fprintf(stderr, "\tIO error.\n"); break;
case EACCES:
fprintf(stderr, "\tPermission error or file is not +x.\n"); break;
default:
fprintf(stderr, "\tMisc error.\n"); break;
} exit(1);
}
return pid;
}
void exec_cmdline(struct command *L){
int i, in, out, status;
pid_t pid;
if (L->pipe == 1)
piping(L);
else {
pid = fork();
if (pid == 0){
if (L->infile || L->outfile)
io_redirect(L);
i = execvp(L->cmd, L->argv);
printf("errno is %d\n", errno);
if (i < 0){
printf("%s: command not found\n", L->cmd);
exit(1);
}
}
else if (pid < 0){
printf("fork failed\n");
exit(1);
}
else {
//pid of child
if (L->pid == 0)
L->pid = pid;
//printf("pid: %d\n", L->pid);
if (L->pcpu > 0){
LALARM = L;
alarm(5);
//efficiency_enforcement(L, pid);
}
if (L->background == 0)
wait(NULL);
}
}
}
void runshell(){
int flag, inp_flag, out_flag, ifd, ofd, stdin_copy, stdout_copy;
char pth[BUFFER];
char fileIn[BUFFER], fileOut[BUFFER];
strcpy(pth,"");
while(1){
printf("myshell@%s> ", getcwd(line,BUFFER));
line[0] = '\0';
fgets(line, BUFFER, stdin);
clearTabs(line);
removeLastEnter(line);
// printf("\nLINE = {%s}\n",line);
int pipeCount = isPipingNeeded(line);
// printf("\npipeCount = %d\n",pipeCount);
if(pipeCount>0){
piping(line,pipeCount);
continue;
}
/************ NO PIPING IS REQUIRED ***********/
inp_flag = extractWord(line, '<' ,fileIn);
out_flag = extractWord(line,'>', fileOut);
if(inp_flag != -1 && out_flag != -1){
if(inp_flag == 1){
stdin_copy = dup(0);
close(0);
ifd = open(fileIn, O_RDONLY);
if (ifd < 0) {
fprintf(stderr, "Unable to open input file in read mode...\n");
continue;
}
}
if(out_flag == 1){
stdout_copy = dup(1);
close(1);
ofd = open(fileOut, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (ofd < 0) {
fprintf(stderr, "Unable to open output file in write mode...\n");
continue;
}
}
}
if(feof(stdin)){
printf("\n");
exit(0);
}
separateWord(line);
//printf("%s",words[0]);
if(!strcmp(words[0],"cd")){
strcpy(pth,"");
strcat(pth,getcwd(line,BUFFER));
//if(words[1][0] != '/')
strcat(pth,"/");
strcat(pth,words[1]);
flag = chdir(pth);
if(flag == -1){
flag = chdir(words[1]);
if(flag == -1) printf("\nNo Such file or directory !!\n");
// runProg(words[0],"",words[1]);
}
}
else if(!strcmp(words[0],"pwd")){
printf("%s\n",getcwd(line,BUFFER));
}
else if(!strcmp(words[0],"mkdir")){
strcpy(pth,"");
strcat(pth,getcwd(line,BUFFER));
strcat(pth,"/");
strcat(pth,words[1]);
flag = mkdir(pth,0777);
if(flag == -1){
flag = mkdir(words[1],0777);
if(flag == -1)
runProg(words[0],"",words[1],0);
}
}
else if(!strcmp(words[0],"rmdir")){
strcpy(pth,"");
strcat(pth,getcwd(line,BUFFER));
strcat(pth,"/");
strcat(pth,words[1]);
flag = rmdir(pth);
if(flag == -1){
flag = rmdir(words[1]);
if(flag == -1)
runProg(words[0],"",words[1],0);
}
}
else if(!strcmp(words[0],"ls") && !(words[1][0] == '-' && words[1][1] == 'l')){
DIR *dp;
struct dirent *ep;
dp = opendir ("./");
if (dp != NULL)
{
while (ep = readdir (dp))
puts (ep->d_name);
(void) closedir (dp);
}
else
puts ("Couldn't open the directory.");
}
else if(!strcmp(words[0],"ls") && words[1][0] == '-' && words[1][1] == 'l'){
DIR *d;
struct dirent *de;
struct stat buf;
int i,j;
char P[10]="rwxrwxrwx",AP[10]=" ";
struct passwd *p;
struct group *g;
struct tm *t;
char time[26];
d=opendir(".");
readdir(d);
readdir(d);
while((de=readdir(d))!=NULL)
{
stat(de->d_name,&buf);
// File Type
if(S_ISDIR(buf.st_mode))
printf("d");
else if(S_ISREG(buf.st_mode))
printf("-");
else if(S_ISCHR(buf.st_mode))
printf("c");
else if(S_ISBLK(buf.st_mode))
printf("b");
else if(S_ISLNK(buf.st_mode))
printf("l");
else if(S_ISFIFO(buf.st_mode))
printf("p");
else if(S_ISSOCK(buf.st_mode))
printf("s");
//File Permissions P-Full Permissions AP-Actual Permissions
for(i=0,j=(1<<8);i<9;i++,j>>=1)
AP[i]= (buf.st_mode & j ) ? P[i] : '-' ;
printf("%s",AP);
//No. of Hard Links
printf("%lu",buf.st_nlink);
//User Name
p=getpwuid(buf.st_uid);
printf(" %.8s",p->pw_name);
//Group Name
g=getgrgid(buf.st_gid);
printf(" %-8.8s",g->gr_name);
//File Size
printf(" %lu",buf.st_size);
//Date and Time of modification
t=localtime(&buf.st_mtime);
strftime(time,sizeof(time),"%b %d %H:%M",t);
printf(" %s",time);
//File Name
printf(" %s\n",de->d_name);
}
}
else if(!strcmp(words[0],"exit")){
