// Our shell main loop
void sh_loop(void)
{
char * line;
char ** args;
int status;
do
{
char hostname[HOST_NAME_MAX + 1];
char pathname[PATH_MAX + 1];
struct passwd * p = getpwuid(getuid());
if(p == NULL) // If we can't get the user_id we should quit.
{
fprintf(stderr, "Could not get username.\n");
exit(EXIT_FAILURE);
}
// Set process effective ID to user ID.
setreuid(getuid(), getuid());
gethostname(hostname, sizeof(hostname)); // Get the hostname.
char * username = p->pw_name;
char * current_dir = getcwd(pathname, sizeof(pathname));
/* Print prompt in the format:
* [username@hostname current_working_directory] %
*/
// If the current working directory is the user's home directory
// we should just print ~ to let them know they are home.
if(strcmp(current_dir, p->pw_dir) == 0)
{
print_userhost(username, hostname, "~");
}
else { print_userhost(username, hostname, current_dir); }
line = sh_get_cmd();
args = sh_tokenize_cmd(line);
status = sh_launch(args);
// Free the memory we used.
free(line);
free(args);
} while(status);
}
int main(void)
{
/* print PIDs */
print_pid("P0");
/* User/Hostname */
print_userhost();
/* Time */
print_time();
/* CWD */
print_cwd("P0");
/* Create ENV Var */
putenv(env_var); // to change env variable, change actual character pointer
handle_processes();
return 0;
}
