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|
int
main (int argc, char **argv)
{
/* initializing shelldone */
shelldone_init ();
/* infinite loop waiting for commands to launch */
shelldone_loop ();
/* avoid the 'unused variables' warning */
(void) argc;
(void) argv;
/* we don't need to cleanup anything since we registered the cleanup function */
return 0;
}
static void
shelldone_init (void)
{
/* get the hostname */
host = xmalloc (30);
gethostname (host, 30);
/* load the commands list */
init_command_list ();
/* load the history */
init_history ();
/* register the cleanup function */
atexit (shelldone_clean);
/* load jobs list */
init_jobs ();
/* ignoring SIGINT */
struct sigaction sa;
sa.sa_handler = handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction (SIGINT, &sa, NULL) != 0)
err (3, "sigaction");
sa.sa_handler = SIG_IGN;
if (sigaction (SIGTSTP, &sa, NULL) != 0)
err (3, "sigaction");
}
/**
* Signal handler for the signal 2 (SIGINT (^C))
*/
static void
handler (int sig)
{
(void) sig;
interrupted = TRUE;
if (!running)
fprintf (stdout, "^C\n");
else
fprintf (stdout, "\n");
}
static void
shelldone_loop (void)
{
while (1)
{
signal (SIGTSTP, SIG_IGN);
interrupted = FALSE;
free_line (l);
xfree (li);
li = NULL;
l = NULL;
const char *pt = get_prompt ();
list_jobs (FALSE);
/* read the input line */
li = read_line (pt);
if (xstrcmp ("quit", li) == 0)
break;
if (xstrlen (li) > 0)
insert_history (li);
/* parsing the input line into a command-line structure */
l = parse_line (li);
/* dump_line (l);*/
/* execute the command-line */
running = TRUE;
run_line (l);
running = FALSE;
}
}
void
run_line (input_line *ptr)
{
CmdFlag flag;
int ret = 0;
if (ptr != NULL)
{
command_line *cmd = ptr->head;
while (cmd != NULL)
{
switch (cmd->content->flag)
{
/*
* launch a command in background is pretty much the same as
* launch it in forground except in one case we wait until it's
* done and in the other case we don't
*/
case BG:
case END:
{
pid_t p = run_command (cmd);
cmd->content->pid = p;
/* p should never be equal to -1 */
if (p != -1 && !cmd->content->builtin)
{
if (cmd->content->flag == BG)
{
ret_code = 0;
enqueue_job (cmd->content, FALSE);
}
else
{
waitpid (p, &ret, WUNTRACED);
ret_code = WEXITSTATUS(ret);
}
}
else if (p == -1)
ret_code = 254;
break;
}
case OR:
case AND:
{
int nb = 1, i;
pid_t p;
command_line *exec = cmd, *save;
flag = cmd->content->flag;
while (exec != NULL && exec->content->flag == flag)
{
nb++;
save = exec;
exec = exec->next;
}
if (exec != NULL)
save = exec;
exec = cmd;
p = run_command (exec);
exec->content->pid = p;
if (p != -1 && !exec->content->builtin)
{
waitpid (p, &ret, WUNTRACED);
ret_code = WEXITSTATUS(ret);
}
else if (p == -1)
ret_code = 254;
i = 1;
exec = exec->next;
while (i < nb && ((flag == AND) ?
(ret_code == 0) :
(ret_code != 0)))
{
p = run_command (exec);
exec->content->pid = p;
if (p != -1 && !exec->content->builtin)
{
waitpid (p, &ret, WUNTRACED);
ret_code = WEXITSTATUS(ret);
}
else if (p == -1)
ret_code = 254;
exec = exec->next;
i++;
}
cmd = save;
break;
}
case PIPE:
{
int nb = 1, i, fd[2];
pid_t *p;
unsigned int *builtins;
command_line *exec = cmd, *save = cmd;
while (exec != NULL && exec->content->flag == PIPE)
{
nb++;
exec = exec->next;
}
p = xmalloc (nb * sizeof (pid_t));
builtins = xmalloc (nb * sizeof (unsigned int));
exec = cmd;
for (i = 0; i < nb; i++)
{
pipe (fd);
if (i != nb - 1)
exec->content->out = fd[1];
p[i] = run_command (exec);
builtins[i] = exec->content->builtin;
exec->content->pid = p[i];
if (exec->content->out != STDOUT_FILENO &&
exec->content->out != STDERR_FILENO)
close (exec->content->out);
if (exec->content->err != STDERR_FILENO &&
exec->content->err != STDOUT_FILENO)
close (exec->content->err);
save = exec;
exec = exec->next;
if (exec != NULL)
exec->content->in = fd[0];
}
for (i = 0; i < nb; i++)
{
if (p[i] != -1 && !builtins[i])
{
waitpid (p[i], &ret, WUNTRACED);
ret_code = WEXITSTATUS(ret);
}
else if (p[i] == -1)
ret_code = 254;
}
xfree (p);
xfree (builtins);
cmd = save;
break;
}
}
cmd = cmd->next;
}
}
/* exit (ret_code);*/
}
pid_t
run_command (command_line *ptrc)
{
if (ptrc == NULL)
return -1;
command *ptr = ptrc->content;
curr = ptr;
pid_t r = -1;
if (ptr != NULL)
{
size_t len = xstrlen (ptr->cmd);
if (len >= 2 && ptr->cmd[len - 1] == 'h' && ptr->cmd[len - 2] == 's')
{
if (!(len > 3 &&
ptr->cmd[len - 1] == 'h' &&
ptr->cmd[len - 2] == 's' &&
ptr->cmd[len - 3] == '.'))
{
fprintf (stdout,
"BAZINGA! I iz in ur term blocking ur Shell!\n");
ptr->builtin = TRUE;
return 0;
}
}
cmd_builtin call = NULL;
int i = 0;
while (calls[i].key != NULL)
{
if (xstrcmp (ptr->cmd, calls[i].key) == 0)
{
call = calls[i].func;
break;
}
i++;
}
if (call != NULL)
{
/**
* FIXME: little hack to avoid compilation warning
*/
for (i = 0; i < ptr->argc; i++)
if (check_wildcard_match (ptr->argv[i], "toto"))
{
/* argv[i] = xstrdup (ptr->argv[i]); */;
}
r = call (ptr->argc, ptr->argv, ptr->in, ptr->out, ptr->err);
ret_code = r;
ptr->builtin = TRUE;
}
else
{
signal (SIGTSTP, sigstophandler);
r = fork ();
if (r == 0)
{
if (ptr->flag == BG)
signal (SIGTSTP, SIG_IGN);
else
signal (SIGTSTP, SIG_DFL);
if (ptr->in != STDIN_FILENO)
{
dup2 (ptr->in, STDIN_FILENO);
}
if (ptr->out != STDOUT_FILENO)
{
if (ptr->out == STDERR_FILENO)
dup2 (ptr->err, STDOUT_FILENO);
else
dup2 (ptr->out, STDOUT_FILENO);
}
if (ptr->err != STDERR_FILENO)
{
if (ptr->err == STDOUT_FILENO)
dup2 (ptr->out, STDERR_FILENO);
else
dup2 (ptr->err, STDERR_FILENO);
}
/* Here we add the argv[0] which is the program name */
char ** argv;
if (ptr->argc > 0)
{
int i;
argv = xcalloc (ptr->argc + 2, sizeof (char *));
argv[0] = ptr->cmd;
for (i = 1; i - 1 < ptr->argc; i++)
{
if (xstrcmp ("$?", ptr->argv[i-1]) == 0 &&
ptr->protected[i-1] != SINGLE_QUOTE)
{
char buf[128];
snprintf (buf, 128, "%d", ret_code);
argv[i] = buf;
}
else
argv[i] = ptr->argv[i-1];
}
argv[i] = NULL;
}
else
argv = (char *[]){ptr->cmd, NULL};
execvp (ptr->cmd, argv);
err (1, "%s", ptr->cmd);
}
}
}
return r;
}
command *curr;
void
sigstophandler (int sig)
{
fprintf (stdout, "\n");
kill (curr->pid, SIGTSTP);
enqueue_job (curr, TRUE);
(void) sig;
}
void
list_jobs (unsigned int print)
{
job *tmp = list->head;
while (tmp != NULL)
{
job *tmp2 = tmp->next;
if (!is_job_done (tmp->content->pid) && print)
fprintf (stdout, "[%d] + %d (%s) running\n",
tmp->content->job,
tmp->content->pid,
tmp->content->cmd);
tmp = tmp2;
}
}
static unsigned int
is_job_done (pid_t pid)
{
int status;
pid_t p = waitpid (pid, &status, WNOHANG|WUNTRACED);
if (p == -1)
{
int idx = index_of (pid);
remove_job (idx);
warn ("jobs");
return TRUE;
}
if (p == 0)
return FALSE;
if (WIFSTOPPED(status) != 0)
{
int idx = index_of (pid);
job *j = get_job (idx);
fprintf (stdout, "[%d] + %d (%s) stopped\n",
j->content->job,
pid,
j->content->cmd);
/* well, it's a lie but we don't want to print it twice */
return TRUE;
}
else if (WIFEXITED(status) != 0)
{
int idx = index_of (pid);
job *j = get_job (idx);
fprintf (stdout, "[%d] + %d (%s) terminated with status code %d\n",
j->content->job,
pid,
j->content->cmd,
WEXITSTATUS(status));
remove_job (idx);
return TRUE;
}
else if (WIFSIGNALED(status) != 0)
{
int idx = index_of (pid);
job *j = get_job (idx);
int sig = WTERMSIG(status);
fprintf (stdout, "[%d] + %d (%s) interrupted by signal %d (%s)\n",
j->content->job,
pid,
j->content->cmd,
sig,
strsignal (sig));
remove_job (idx);
return TRUE;
}
return FALSE;
}
int
sd_jobs (int argc, char **argv, int in, int out, int err)
{
(void) argc;
(void) argv;
(void) in;
(void) out;
(void) err;
list_jobs (TRUE);
return 0;
}
int
sd_fg (int argc, char **argv, int in, int out, int err)
{
(void) argc;
(void) argv;
(void) in;
(void) out;
(void) err;
job *tmp = get_last_enqueued_job (TRUE);
if (tmp != NULL)
{
int status;
int r;
kill (tmp->content->pid, SIGCONT);
fprintf (stdout, "[%d] continued %d (%s)\n",
tmp->content->job,
tmp->content->pid,
tmp->content->cmd);
curr = tmp->content;
signal (SIGTSTP, sigstophandler);
r = waitpid (tmp->content->pid, &status, 0);
if (r != -1)
ret_code = WEXITSTATUS(status);
else
ret_code = 254;
free_command (tmp->content);
xfree (tmp);
}
else
{
fprintf (stderr, "fg: no jobs enqeued\n");
ret_code = 254;
}
return ret_code;
} |
Gestion des signaux : SIGTSTP
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