void
init_subshell (void)
{
/* This must be remembered across calls to init_subshell() */
static char pty_name[BUF_SMALL];
char precmd[BUF_SMALL];
switch (check_sid ())
{
case 1:
mc_global.tty.use_subshell = FALSE;
return;
case 2:
mc_global.tty.use_subshell = FALSE;
mc_global.midnight_shutdown = TRUE;
return;
}
/* Take the current (hopefully pristine) tty mode and make */
/* a raw mode based on it now, before we do anything else with it */
init_raw_mode ();
if (mc_global.tty.subshell_pty == 0)
{ /* First time through */
/* Find out what type of shell we have */
if (strstr (mc_global.tty.shell, "/zsh") || getenv ("ZSH_VERSION"))
subshell_type = ZSH;
else if (strstr (mc_global.tty.shell, "/tcsh"))
subshell_type = TCSH;
else if (strstr (mc_global.tty.shell, "/csh"))
subshell_type = TCSH;
else if (strstr (mc_global.tty.shell, "/bash") || getenv ("BASH"))
subshell_type = BASH;
else if (strstr (mc_global.tty.shell, "/fish"))
subshell_type = FISH;
else
{
mc_global.tty.use_subshell = FALSE;
return;
}
/* Open a pty for talking to the subshell */
/* FIXME: We may need to open a fresh pty each time on SVR4 */
mc_global.tty.subshell_pty = pty_open_master (pty_name);
if (mc_global.tty.subshell_pty == -1)
{
fprintf (stderr, "Cannot open master side of pty: %s\r\n", unix_error_string (errno));
mc_global.tty.use_subshell = FALSE;
return;
}
subshell_pty_slave = pty_open_slave (pty_name);
if (subshell_pty_slave == -1)
{
fprintf (stderr, "Cannot open slave side of pty %s: %s\r\n",
pty_name, unix_error_string (errno));
mc_global.tty.use_subshell = FALSE;
return;
}
/* Create a pipe for receiving the subshell's CWD */
if (subshell_type == TCSH)
{
g_snprintf (tcsh_fifo, sizeof (tcsh_fifo), "%s/mc.pipe.%d",
mc_tmpdir (), (int) getpid ());
if (mkfifo (tcsh_fifo, 0600) == -1)
{
fprintf (stderr, "mkfifo(%s) failed: %s\r\n", tcsh_fifo, unix_error_string (errno));
mc_global.tty.use_subshell = FALSE;
return;
}
/* Opening the FIFO as O_RDONLY or O_WRONLY causes deadlock */
if ((subshell_pipe[READ] = open (tcsh_fifo, O_RDWR)) == -1
|| (subshell_pipe[WRITE] = open (tcsh_fifo, O_RDWR)) == -1)
{
fprintf (stderr, _("Cannot open named pipe %s\n"), tcsh_fifo);
perror (__FILE__ ": open");
mc_global.tty.use_subshell = FALSE;
return;
}
}
else /* subshell_type is BASH or ZSH */ if (pipe (subshell_pipe))
{
perror (__FILE__ ": couldn't create pipe");
mc_global.tty.use_subshell = FALSE;
return;
}
}
/* Fork the subshell */
subshell_alive = TRUE;
subshell_stopped = FALSE;
subshell_pid = fork ();
if (subshell_pid == -1)
{
fprintf (stderr, "Cannot spawn the subshell process: %s\r\n", unix_error_string (errno));
/* We exit here because, if the process table is full, the */
/* other method of running user commands won't work either */
exit (EXIT_FAILURE);
}
if (subshell_pid == 0)
{
/* We are in the child process */
init_subshell_child (pty_name);
}
/* Set up 'precmd' or equivalent for reading the subshell's CWD */
switch (subshell_type)
{
case BASH:
g_snprintf (precmd, sizeof (precmd),
" PROMPT_COMMAND='pwd>&%d;kill -STOP $$'\n", subshell_pipe[WRITE]);
break;
case ZSH:
g_snprintf (precmd, sizeof (precmd),
" precmd(){ pwd>&%d;kill -STOP $$ }\n", subshell_pipe[WRITE]);
break;
case TCSH:
g_snprintf (precmd, sizeof (precmd),
"set echo_style=both;"
"alias precmd 'echo $cwd:q >>%s;kill -STOP $$'\n", tcsh_fifo);
break;
case FISH:
g_snprintf (precmd, sizeof (precmd),
"function fish_prompt ; pwd>&%d;kill -STOP %%self; end\n",
subshell_pipe[WRITE]);
break;
}
write_all (mc_global.tty.subshell_pty, precmd, strlen (precmd));
/* Wait until the subshell has started up and processed the command */
subshell_state = RUNNING_COMMAND;
tty_enable_interrupt_key ();
if (!feed_subshell (QUIETLY, TRUE))
{
mc_global.tty.use_subshell = FALSE;
}
tty_disable_interrupt_key ();
if (!subshell_alive)
mc_global.tty.use_subshell = FALSE; /* Subshell died instantly, so don't use it */
}
void
init_subshell (void)
{
/* This must be remembered across calls to init_subshell() */
static char pty_name[BUF_SMALL];
/* Must be considerably longer than BUF_SMALL (128) to support fancy shell prompts */
char precmd[BUF_MEDIUM];
switch (check_sid ())
{
case 1:
mc_global.tty.use_subshell = FALSE;
return;
case 2:
mc_global.tty.use_subshell = FALSE;
mc_global.midnight_shutdown = TRUE;
return;
default:
break;
}
/* Take the current (hopefully pristine) tty mode and make */
/* a raw mode based on it now, before we do anything else with it */
init_raw_mode ();
if (mc_global.tty.subshell_pty == 0)
{ /* First time through */
if (mc_global.shell->type == SHELL_NONE)
return;
/* Open a pty for talking to the subshell */
/* FIXME: We may need to open a fresh pty each time on SVR4 */
mc_global.tty.subshell_pty = pty_open_master (pty_name);
if (mc_global.tty.subshell_pty == -1)
{
fprintf (stderr, "Cannot open master side of pty: %s\r\n", unix_error_string (errno));
mc_global.tty.use_subshell = FALSE;
return;
}
subshell_pty_slave = pty_open_slave (pty_name);
if (subshell_pty_slave == -1)
{
fprintf (stderr, "Cannot open slave side of pty %s: %s\r\n",
pty_name, unix_error_string (errno));
mc_global.tty.use_subshell = FALSE;
return;
}
/* Create a pipe for receiving the subshell's CWD */
if (mc_global.shell->type == SHELL_TCSH)
{
g_snprintf (tcsh_fifo, sizeof (tcsh_fifo), "%s/mc.pipe.%d",
mc_tmpdir (), (int) getpid ());
if (mkfifo (tcsh_fifo, 0600) == -1)
{
fprintf (stderr, "mkfifo(%s) failed: %s\r\n", tcsh_fifo, unix_error_string (errno));
mc_global.tty.use_subshell = FALSE;
return;
}
/* Opening the FIFO as O_RDONLY or O_WRONLY causes deadlock */
if ((subshell_pipe[READ] = open (tcsh_fifo, O_RDWR)) == -1
|| (subshell_pipe[WRITE] = open (tcsh_fifo, O_RDWR)) == -1)
{
fprintf (stderr, _("Cannot open named pipe %s\n"), tcsh_fifo);
perror (__FILE__ ": open");
mc_global.tty.use_subshell = FALSE;
return;
}
}
else if (pipe (subshell_pipe)) /* subshell_type is BASH, ASH_BUSYBOX, DASH or ZSH */
{
perror (__FILE__ ": couldn't create pipe");
mc_global.tty.use_subshell = FALSE;
return;
}
}
/* Fork the subshell */
subshell_alive = TRUE;
subshell_stopped = FALSE;
subshell_pid = fork ();
if (subshell_pid == -1)
{
fprintf (stderr, "Cannot spawn the subshell process: %s\r\n", unix_error_string (errno));
/* We exit here because, if the process table is full, the */
/* other method of running user commands won't work either */
exit (EXIT_FAILURE);
}
if (subshell_pid == 0)
{
/* We are in the child process */
init_subshell_child (pty_name);
}
init_subshell_precmd (precmd, BUF_MEDIUM);
write_all (mc_global.tty.subshell_pty, precmd, strlen (precmd));
/* Wait until the subshell has started up and processed the command */
subshell_state = RUNNING_COMMAND;
tty_enable_interrupt_key ();
if (!feed_subshell (QUIETLY, TRUE))
{
mc_global.tty.use_subshell = FALSE;
}
tty_disable_interrupt_key ();
if (!subshell_alive)
mc_global.tty.use_subshell = FALSE; /* Subshell died instantly, so don't use it */
}
