void execute(char *cmd)
{
/* Arguments:
*cmd --- the program to run
Purpose:
this function takes a string and forks off
a new process with the global args array
this will first check to see if aliases exist for
the command. check_alias will deal with
changing arg[0] if an alias exists, so always
call execvp with arg[0] (instead of cmd arg) in
case check_alias changes the cmd
it will then check to see if the cmd is a built in
command. if it is, then this doesnt fork any process
*/
int i;
check_alias(cmd);
i = check_builtin(args[0]);
if(!i) { return;} //cmd was a built in (like "cd")
if(fork() == 0) {
//now in child process
check_redir(); //check for redirections
i = execvp(args[0], args); //using execvp to avoid PATH crap
if(i < 0) {
printf("-fash: %s: command not found\n", cmd); //error, we'll just say not found
exit(1);
}
}
else { handleSig = 1; wait(NULL); }
handleSig = 0;
}
void pipe_execute(char *cmd, int readWrite)
{
/* Arguments:
*cmd --- the program to run
*fds --- array of two file descriptors for pipe
readWrite --- 0 = read, 1 = write, 2 = both
Purpose:
this function takes a string and forks off
a new process with the global args array
this will first check to see if aliases exist for
the command. check_alias will deal with
changing arg[0] if an alias exists, so always
call execvp with arg[0] (instead of cmd arg) in
case check_alias changes the cmd
it will then check to see if the cmd is a built in
command. if it is, then this doesnt fork any process
*/
int i;
check_alias(cmd);
i = check_builtin(args[0]);
if(!i) { return;} //cmd was a built in (like "cd")
if(fork() == 0) {
//in child
check_redir();
int newfd, readfd, writefd;
if(readWrite == 2){ //this is a middle command, no closing, dup both stdin and stdout
readfd = open("pipe", O_RDONLY);
writefd = open("pipe_middle", O_WRONLY | O_CREAT, S_IRWXU | S_IRGRP | S_IROTH);
close(0);
dup(readfd);
close(1);
dup(writefd);
}else if (readWrite == 1){ //first command, purely writing
newfd = open("pipe", O_WRONLY | O_CREAT, S_IRWXU | S_IRGRP | S_IROTH);
dup2(newfd,1);
close(newfd);
}else{ //last command, purely reading
newfd = open("pipe", O_RDONLY);
close(0);
dup(newfd);
close(newfd);
}
i = execvp(args[0], args);
if(i < 0) {
printf("-fash: %s: command not found\n", cmd); //error, we'll just say not found
exit(1);
}
if(readWrite == 0){ close(0);close(newfd);}
else if(readWrite ==1){close(1);close(newfd);}
else{ close(0);close(1);close(readfd);close(writefd);system("mv pipe_middle pipe");}
} else {wait(NULL);} //wait for everyone
}
int main(void)
{
char line[MAXLINE];
int i;
char ** arglist;
struct sigaction act;
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTSTP, SIG_IGN);
act.sa_handler = child_handler;
sigfillset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGCHLD,&act,NULL);
fputs("minishell> ",stdout);
while(fgets(line,MAXLINE,stdin))
{
if(!strncmp(line,"exit",4))
{
exit(0);
}
if(arglist=command_parse(line))
{
if(!check_builtin(arglist))
{
// for(i=0;arglist[i];i++)
// {
// printf("[%d] : %s\n", i,arglist[i]);
exec_command(arglist);
// }
}
command_freelist(arglist);
}
fputs("minishell> ",stdout);
}
return 0;
}
int main(int argc, char *argv[])
{
read_history(history_file);
char* line_read = (char *)NULL;
while (true) {
const std::string prompt = "$ ";
if (line_read) {
free(line_read);
line_read = (char *)NULL;
}
line_read = readline(prompt.c_str());
if (line_read && *line_read)
add_history(line_read);
std::string command(line_read);
clear_line(command);
int result = check_builtin(command);
if (result == 0) {
break;
} else if (result == -1) { /* command is not builtin */
pid_t pid = fork();
/* code of parent process */
if (pid != 0) {
int status = 0;
waitpid(pid, &status, 0);
/* code of child process */
} else {
if (command.find('|') != std::string::npos) {
make_pipe(command);
} else {
Command cmd(command);
execvp(cmd.cmd, cmd.params);
}
}
}
}
write_history(history_file);
free(line_read);
return 0;
}
int why_im_stupid(char **ftab, char **env)
{
char **tab;
int i;
i = 0;
while (ftab[i])
{
if ((check_redirection(ftab[i], env) == 0))
{
if (ftab[i + 1] != NULL)
i++;
else
return (0);
}
tab = str_to_word_tab(ftab[i], ' ');
if ((check_builtin(tab, env)) == 1)
if ((cmd(tab, env)) == 1)
return (0);
i++;
}
return (0);
}
