void eval (char *cmdline)
{
char *argv[MAXARGS];
char buf[MAXLINE];
bool bg;
pid_t pid;
strcpy (buf, cmdline);
bg = parseline (buf, argv);
if (argv[0] == NULL)
{
return;
}
if (!buildin_command (argv))
{
if ((pid = wp_fork()) == 0)
{
if (execvp (argv[0], argv) < 0)
{
wp_error ("%s: Command not found.\n", argv[0]);
}
}
}
if (!bg)
{
int status;
wp_waitpid (pid, &status, 0);
}
else
{
printf ("%d %s", pid, cmdline);
}
return;
}
int main()
{
char command[MAX_COMMAND_LEN];
char *parameters[MAX_PAR_CNT];
int status;
int out_fd, in_fd;
pid_t child_id1, child_id2;
while(TRUE) {
int pipe_id[2];
type_promt();
int cnt = read_command(command, parameters);
struct command_info info;
parsing(parameters, cnt, &info);
if(buildin_command(command, parameters))
continue;
if(info.flag & IS_PIPED) {
pipe(pipe_id);
}
if((child_id1 = fork()) != 0) { //shell
if(info.flag & IS_PIPED) {
if((child_id2 = fork()) != 0) { //shell
close(pipe_id[0]);
close(pipe_id[1]);
waitpid(child_id2, NULL, 0);//wait command2
}
else { //command2
close(pipe_id[1]);
close(fileno(stdin));
dup2(pipe_id[0], fileno(stdin));
close(pipe_id[0]);
execvp(info.command2, info.parameters2);
}
}
waitpid(child_id1, NULL, 0);//wait command1
}
else { //command1
if(info.flag & OUT_REDIRECT) {
out_fd = open(info.out_file, O_WRONLY|O_CREAT|O_TRUNC, 0666);
close(fileno(stdout));
dup2(out_fd, fileno(stdout));
close(out_fd);
}
if(info.flag & OUT_REDIRECT_APPEND) {
out_fd = open(info.out_file, O_WRONLY|O_APPEND, 0666);
close(fileno(stdout));
dup2(out_fd, fileno(stdout));
close(out_fd);
}
if(info.flag & IN_REDIRECT) {
in_fd = open(info.in_file, O_RDONLY, 0666);
close(fileno(stdin));
dup2(in_fd, fileno(stdin));
close(in_fd);
}
if(info.flag & IS_PIPED) {
close(pipe_id[0]);
close(fileno(stdout));
dup2(pipe_id[1], fileno(stdout));
close(pipe_id[1]);
}
execvp(command, parameters);
}
}
return 0;
}
