static enum cmd_retval
cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
{
struct args *args = self->args;
struct client *c = cmd_find_client(item, NULL, 1);
struct window_pane *wp = item->target.wp;
struct session *s = item->target.s;
struct winlink *wl = item->target.wl;
char *cmd;
int old_fd, pipe_fd[2], null_fd, in, out;
struct format_tree *ft;
sigset_t set, oldset;
/* Destroy the old pipe. */
old_fd = wp->pipe_fd;
if (wp->pipe_fd != -1) {
bufferevent_free(wp->pipe_event);
close(wp->pipe_fd);
wp->pipe_fd = -1;
if (window_pane_destroy_ready(wp)) {
server_destroy_pane(wp, 1);
return (CMD_RETURN_NORMAL);
}
}
/* If no pipe command, that is enough. */
if (args->argc == 0 || *args->argv[0] == '\0')
return (CMD_RETURN_NORMAL);
/*
* With -o, only open the new pipe if there was no previous one. This
* allows a pipe to be toggled with a single key, for example:
*
* bind ^p pipep -o 'cat >>~/output'
*/
if (args_has(self->args, 'o') && old_fd != -1)
return (CMD_RETURN_NORMAL);
/* What do we want to do? Neither -I or -O is -O. */
if (args_has(self->args, 'I')) {
in = 1;
out = args_has(self->args, 'O');
} else {
in = 0;
out = 1;
}
/* Open the new pipe. */
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
cmdq_error(item, "socketpair error: %s", strerror(errno));
return (CMD_RETURN_ERROR);
}
/* Expand the command. */
ft = format_create(item->client, item, FORMAT_NONE, 0);
format_defaults(ft, c, s, wl, wp);
cmd = format_expand_time(ft, args->argv[0]);
format_free(ft);
/* Fork the child. */
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, &oldset);
switch (fork()) {
case -1:
sigprocmask(SIG_SETMASK, &oldset, NULL);
cmdq_error(item, "fork error: %s", strerror(errno));
free(cmd);
return (CMD_RETURN_ERROR);
case 0:
/* Child process. */
proc_clear_signals(server_proc, 1);
sigprocmask(SIG_SETMASK, &oldset, NULL);
close(pipe_fd[0]);
null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
if (out) {
if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
_exit(1);
} else {
if (dup2(null_fd, STDIN_FILENO) == -1)
_exit(1);
}
if (in) {
if (dup2(pipe_fd[1], STDOUT_FILENO) == -1)
_exit(1);
if (pipe_fd[1] != STDOUT_FILENO)
close(pipe_fd[1]);
} else {
if (dup2(null_fd, STDOUT_FILENO) == -1)
_exit(1);
}
if (dup2(null_fd, STDERR_FILENO) == -1)
_exit(1);
closefrom(STDERR_FILENO + 1);
execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
_exit(1);
default:
/* Parent process. */
sigprocmask(SIG_SETMASK, &oldset, NULL);
close(pipe_fd[1]);
wp->pipe_fd = pipe_fd[0];
if (wp->fd != -1)
wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
else
wp->pipe_off = 0;
setblocking(wp->pipe_fd, 0);
wp->pipe_event = bufferevent_new(wp->pipe_fd,
cmd_pipe_pane_read_callback,
cmd_pipe_pane_write_callback,
cmd_pipe_pane_error_callback,
wp);
if (wp->pipe_event == NULL)
fatalx("out of memory");
if (out)
bufferevent_enable(wp->pipe_event, EV_WRITE);
if (in)
bufferevent_enable(wp->pipe_event, EV_READ);
free(cmd);
return (CMD_RETURN_NORMAL);
}
}
/* Start a job running, if it isn't already. */
struct job *
job_run(const char *cmd, struct session *s, const char *cwd,
job_update_cb updatecb, job_complete_cb completecb, job_free_cb freecb,
void *data, int flags)
{
struct job *job;
struct environ *env;
pid_t pid;
int nullfd, out[2];
const char *home;
sigset_t set, oldset;
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, out) != 0)
return (NULL);
/*
* Do not set TERM during .tmux.conf, it is nice to be able to use
* if-shell to decide on default-terminal based on outside TERM.
*/
env = environ_for_session(s, !cfg_finished);
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, &oldset);
switch (pid = fork()) {
case -1:
sigprocmask(SIG_SETMASK, &oldset, NULL);
environ_free(env);
close(out[0]);
close(out[1]);
return (NULL);
case 0:
proc_clear_signals(server_proc, 1);
sigprocmask(SIG_SETMASK, &oldset, NULL);
if (cwd == NULL || chdir(cwd) != 0) {
if ((home = find_home()) == NULL || chdir(home) != 0)
chdir("/");
}
environ_push(env);
environ_free(env);
if (dup2(out[1], STDIN_FILENO) == -1)
fatal("dup2 failed");
if (dup2(out[1], STDOUT_FILENO) == -1)
fatal("dup2 failed");
if (out[1] != STDIN_FILENO && out[1] != STDOUT_FILENO)
close(out[1]);
close(out[0]);
nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
if (nullfd < 0)
fatal("open failed");
if (dup2(nullfd, STDERR_FILENO) == -1)
fatal("dup2 failed");
if (nullfd != STDERR_FILENO)
close(nullfd);
closefrom(STDERR_FILENO + 1);
execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
fatal("execl failed");
}
sigprocmask(SIG_SETMASK, &oldset, NULL);
environ_free(env);
close(out[1]);
job = xmalloc(sizeof *job);
job->state = JOB_RUNNING;
job->flags = flags;
job->cmd = xstrdup(cmd);
job->pid = pid;
job->status = 0;
LIST_INSERT_HEAD(&all_jobs, job, entry);
job->updatecb = updatecb;
job->completecb = completecb;
job->freecb = freecb;
job->data = data;
job->fd = out[0];
setblocking(job->fd, 0);
job->event = bufferevent_new(job->fd, job_read_callback,
job_write_callback, job_error_callback, job);
bufferevent_enable(job->event, EV_READ|EV_WRITE);
log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
return (job);
}
