/src/tmux/spawn.c

Source
/* $OpenBSD: spawn.c,v 1.50 2026/07/23 09:38:27 nicm Exp $ */

/*
 * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/wait.h>

#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Set up the environment and create a new window and pane or a new pane.
 *
 * We need to set up the following items:
 *
 * - history limit, comes from the session;
 *
 * - base index, comes from the session;
 *
 * - current working directory, may be specified - if it isn't it comes from
 *   either the client or the session;
 *
 * - PATH variable, comes from the client if any, otherwise from the session
 *   environment;
 *
 * - shell, comes from default-shell;
 *
 * - termios, comes from the session;
 *
 * - remaining environment, comes from the session.
 */

static void
spawn_log(const char *from, struct spawn_context *sc)
{
  struct session    *s = sc->s;
  struct winlink    *wl = sc->wl;
  struct window_pane  *wp0 = sc->wp0;
  const char    *name = (sc->name == NULL ? "none" : sc->name);
  char       tmp[128];

  log_debug("%s: name=%s, flags=%#x", from, name, sc->flags);
  if (wl != NULL && wp0 != NULL)
    xsnprintf(tmp, sizeof tmp, "wl=%d wp0=%%%u", wl->idx, wp0->id);
  else if (wl != NULL)
    xsnprintf(tmp, sizeof tmp, "wl=%d wp0=none", wl->idx);
  else if (wp0 != NULL)
    xsnprintf(tmp, sizeof tmp, "wl=none wp0=%%%u", wp0->id);
  else
    xsnprintf(tmp, sizeof tmp, "wl=none wp0=none");
  log_debug("%s: s=$%u %s idx=%d", from, s->id, tmp, sc->idx);
}

static void
spawn_fire_pane_created(struct spawn_context *sc, struct window_pane *wp)
{
  struct event_payload  *ep;
  struct cmd_find_state  fs;
  char      *cmd = NULL;
  const char    *cwd = wp->cwd;

  ep = event_payload_create();
  cmd_find_from_winlink_pane(&fs, sc->wl, wp, 0);
  event_payload_set_target(ep, &fs);
  event_payload_set_session(ep, "session", sc->s);
  event_payload_set_window(ep, "window", wp->window);
  event_payload_set_int(ep, "window_index", sc->wl->idx);
  event_payload_set_pane(ep, "pane", wp);

  if (wp->argc != 0)
    cmd = cmd_stringify_argv(wp->argc, wp->argv);
  if (cmd != NULL && *cmd != '\0')
    event_payload_set_string(ep, "pane_command", "%s", cmd);
  else if (wp->shell != NULL)
    event_payload_set_string(ep, "pane_command", "%s", wp->shell);
  free(cmd);

  if (cwd != NULL)
    event_payload_set_string(ep, "pane_current_path", "%s", cwd);

  if (sc->flags & SPAWN_EMPTY)
    event_payload_set_int(ep, "created_empty", 1);
  else
    event_payload_set_int(ep, "created_empty", 0);
  if (sc->flags & SPAWN_RESPAWN)
    event_payload_set_int(ep, "created_respawn", 1);
  else
    event_payload_set_int(ep, "created_respawn", 0);

  events_fire("pane-created", ep);
}

struct winlink *
spawn_window(struct spawn_context *sc, char **cause)
{
  struct session    *s = sc->s;
  struct window   *w;
  struct window_pane  *wp;
  struct winlink    *wl;
  int      idx = sc->idx;
  u_int      sx, sy, xpixel, ypixel;

  spawn_log(__func__, sc);

  /*
   * If the window already exists, we are respawning, so destroy all the
   * panes except one.
   */
  if (sc->flags & SPAWN_RESPAWN) {
    w = sc->wl->window;
    if (~sc->flags & SPAWN_KILL) {
      TAILQ_FOREACH(wp, &w->panes, entry) {
        if (wp->fd != -1)
          break;
      }
      if (wp != NULL) {
        xasprintf(cause, "window %s:%d still active",
            s->name, sc->wl->idx);
        return (NULL);
      }
    }

    sc->wp0 = TAILQ_FIRST(&w->panes);
    TAILQ_REMOVE(&w->panes, sc->wp0, entry);

    layout_free(w, 0);
    window_destroy_panes(w);

    TAILQ_INSERT_HEAD(&w->panes, sc->wp0, entry);
    window_pane_resize(sc->wp0, w->sx, w->sy);

    layout_init(w, sc->wp0);
    w->active = NULL;
    window_set_active_pane(w, sc->wp0, 0);
  }

  /*
   * Otherwise we have no window so we will need to create one. First
   * check if the given index already exists and destroy it if so.
   */
  if ((~sc->flags & SPAWN_RESPAWN) && idx != -1) {
    wl = winlink_find_by_index(&s->windows, idx);
    if (wl != NULL && (~sc->flags & SPAWN_KILL)) {
      xasprintf(cause, "index %d in use", idx);
      return (NULL);
    }
    if (wl != NULL) {
      /*
       * Can't use session_detach as it will destroy session
       * if this makes it empty.
       */
      wl->flags &= ~WINLINK_ALERTFLAGS;
      events_fire_winlink("window-unlinked", wl);
      winlink_stack_remove(&s->lastw, wl);
      winlink_remove(&s->windows, wl);

      if (s->curw == wl) {
        s->curw = NULL;
        sc->flags &= ~SPAWN_DETACHED;
      }
    }
  }

  /* Then create a window if needed. */
  if (~sc->flags & SPAWN_RESPAWN) {
    if (idx == -1)
      idx = -1 - options_get_number(s->options, "base-index");
    if ((sc->wl = winlink_add(&s->windows, idx)) == NULL) {
      xasprintf(cause, "couldn't add window %d", idx);
      return (NULL);
    }
    default_window_size(sc->tc, s, NULL, &sx, &sy, &xpixel, &ypixel,
        -1);
    if ((w = window_create(sx, sy, xpixel, ypixel)) == NULL) {
      winlink_remove(&s->windows, sc->wl);
      xasprintf(cause, "couldn't create window %d", idx);
      return (NULL);
    }
    if (s->curw == NULL)
      s->curw = sc->wl;
    sc->wl->session = s;
    w->latest = sc->tc;
    winlink_set_window(sc->wl, w);
  } else
    w = NULL;
  sc->flags |= SPAWN_NONOTIFY;

  /* Spawn the pane. */
  wp = spawn_pane(sc, cause);
  if (wp == NULL) {
    if (~sc->flags & SPAWN_RESPAWN)
      winlink_remove(&s->windows, sc->wl);
    return (NULL);
  }

  /* Set the name of the new window. */
  if (~sc->flags & SPAWN_RESPAWN) {
    free(w->name);
    if (sc->name == NULL)
      w->name = default_window_name(w);
    else {
      w->name = xstrdup(sc->name);
      options_set_number(w->options, "automatic-rename", 0);
    }
    window_set_fill_cells(w);
  }

  /* Switch to the new window if required. */
  if (~sc->flags & SPAWN_DETACHED)
    session_select(s, sc->wl->idx);

  /* Fire notification if new window. */
  if (~sc->flags & SPAWN_RESPAWN) {
    events_fire_window("window-created", w);
    events_fire_winlink("window-linked", sc->wl);
  }

  session_group_synchronize_from(s);
  return (sc->wl);
}

struct window_pane *
spawn_pane(struct spawn_context *sc, char **cause)
{
  struct cmdq_item   *item = sc->item;
  struct client    *c;
  struct session     *s = sc->s;
  struct session     *ts;
  struct window    *w = sc->wl->window;
  struct window_pane   *new_wp;
  struct environ     *child;
  struct environ_entry   *ee;
  char      **argv, *cp, **argvp, *argv0, *cwd, *new_cwd;
  char        path[PATH_MAX];
  const char     *cmd, *tmp, *home = find_home();
  const char     *actual_cwd = NULL;
  int       argc;
  u_int       idx;
  struct termios      now;
  u_int       hlimit;
  struct winsize      ws;
  sigset_t      set, oldset;
  key_code      key;

  if (item != NULL) {
    ts = cmdq_get_target(item)->s;
    c = cmdq_get_client(item);
  } else {
    ts = s;
    c = sc->tc;
  }

  spawn_log(__func__, sc);

  if (sc->flags & SPAWN_MODAL) {
    if (~sc->flags & SPAWN_FLOATING) {
      xasprintf(cause, "modal pane must be floating");
      return (NULL);
    }
    if (w->modal != NULL) {
      xasprintf(cause, "window already has a modal pane");
      return (NULL);
    }
  }

  /*
   * Work out the current working directory. If respawning, use
   * the pane's stored one unless specified.
   */
  if (sc->cwd != NULL) {
    if (item != NULL)
      cwd = format_single(item, sc->cwd, c, ts, NULL, NULL);
    else
      cwd = xstrdup(sc->cwd);
    if (*cwd != '/') {
      xasprintf(&new_cwd, "%s%s%s",
          server_client_get_cwd(c, ts),
          *cwd != '\0' ? "/" : "", cwd);
      free(cwd);
      cwd = new_cwd;
    }
  } else if (~sc->flags & SPAWN_RESPAWN)
    cwd = xstrdup(server_client_get_cwd(c, ts));
  else
    cwd = NULL;

  /*
   * If we are respawning then get rid of the old process. Otherwise
   * either create a new cell or assign to the one we are given.
   */
  hlimit = options_get_number(s->options, "history-limit");
  if (sc->flags & SPAWN_RESPAWN) {
    if (sc->wp0->fd != -1 && (~sc->flags & SPAWN_KILL)) {
      window_pane_index(sc->wp0, &idx);
      xasprintf(cause, "pane %s:%d.%u still active",
          s->name, sc->wl->idx, idx);
      free(cwd);
      return (NULL);
    }
    if (sc->wp0->event != NULL) {
      bufferevent_free(sc->wp0->event);
      sc->wp0->event = NULL;
    }
    if (sc->wp0->fd != -1) {
      close(sc->wp0->fd);
      sc->wp0->fd = -1;
    }
    window_pane_reset_mode_all(sc->wp0);
    screen_reinit(&sc->wp0->base, 0);
    if (sc->wp0->ictx != NULL) {
      input_free(sc->wp0->ictx);
      sc->wp0->ictx = NULL;
    }
    new_wp = sc->wp0;
    new_wp->flags &= ~(PANE_STATUSREADY|PANE_STATUSDRAWN);
  } else {
    if (sc->lc == NULL) {
      new_wp = window_add_pane(w, NULL, hlimit, sc->flags);
      layout_init(w, new_wp);
    } else {
      new_wp = window_add_pane(w, sc->wp0, hlimit, sc->flags);
      if (sc->flags & SPAWN_ZOOM)
        layout_assign_pane(sc->lc, new_wp, 1);
      else
        layout_assign_pane(sc->lc, new_wp, 0);
    }
    if (sc->flags & SPAWN_FLOATING)
      new_wp->layout_cell->flags |= LAYOUT_CELL_FLOATING;

    /*
     * If window currently zoomed, window_set_active_pane calls
     * window_unzoom which it copies back the saved_layout_cell.
     */
    if (w->flags & WINDOW_ZOOMED)
      new_wp->saved_layout_cell = new_wp->layout_cell;
  }

  /*
   * Now we have a pane with nothing running in it ready for the new
   * process. Work out the command and arguments and store the working
   * directory.
   */
  if (sc->argc == 0 && (~sc->flags & SPAWN_RESPAWN)) {
    cmd = options_get_string(s->options, "default-command");
    if (cmd != NULL && *cmd != '\0') {
      argc = 1;
      argv = (char **)&cmd;
    } else {
      argc = 0;
      argv = NULL;
    }
  } else {
    argc = sc->argc;
    argv = sc->argv;
  }
  if (cwd != NULL) {
    free(new_wp->cwd);
    new_wp->cwd = cwd;
  }

  /*
   * Replace the stored arguments if there are new ones. If not, the
   * existing ones will be used (they will only exist for respawn).
   */
  if (argc > 0) {
    cmd_free_argv(new_wp->argc, new_wp->argv);
    new_wp->argc = argc;
    new_wp->argv = cmd_copy_argv(argc, argv);
  }

  /* Create an environment for this pane. */
  child = environ_for_session(s, 0);
  if (sc->environ != NULL)
    environ_copy(sc->environ, child);
  environ_set(child, "TMUX_PANE", 0, "%%%u", new_wp->id);

  /*
   * Then the PATH environment variable. The session one is replaced from
   * the client if there is one because otherwise running "tmux new
   * myprogram" wouldn't work if myprogram isn't in the session's path.
   */
  if (c != NULL && c->session == NULL) { /* only unattached clients */
    ee = environ_find(c->environ, "PATH");
    if (ee != NULL)
      environ_set(child, "PATH", 0, "%s", ee->value);
  }
  if (environ_find(child, "PATH") == NULL)
    environ_set(child, "PATH", 0, "%s", _PATH_DEFPATH);

  /* Then the shell. If respawning, use the old one. */
  if (~sc->flags & SPAWN_RESPAWN) {
    tmp = options_get_string(s->options, "default-shell");
    if (!checkshell(tmp))
      tmp = _PATH_BSHELL;
    free(new_wp->shell);
    new_wp->shell = xstrdup(tmp);
  }
  environ_set(child, "SHELL", 0, "%s", new_wp->shell);

  /* Log the arguments we are going to use. */
  log_debug("%s: shell=%s", __func__, new_wp->shell);
  if (new_wp->argc != 0) {
    cp = cmd_stringify_argv(new_wp->argc, new_wp->argv);
    log_debug("%s: cmd=%s", __func__, cp);
    free(cp);
  }
  log_debug("%s: cwd=%s", __func__, new_wp->cwd);
  cmd_log_argv(new_wp->argc, new_wp->argv, "%s", __func__);
  environ_log(child, "%s: environment ", __func__);

  /* Initialize the window size. */
  memset(&ws, 0, sizeof ws);
  ws.ws_col = screen_size_x(&new_wp->base);
  ws.ws_row = screen_size_y(&new_wp->base);
  ws.ws_xpixel = w->xpixel * ws.ws_col;
  ws.ws_ypixel = w->ypixel * ws.ws_row;

  /* Block signals until fork has completed. */
  sigfillset(&set);
  sigprocmask(SIG_BLOCK, &set, &oldset);

  /* If the command is empty, don't fork a child process. */
  if (sc->flags & SPAWN_EMPTY) {
    new_wp->flags |= PANE_EMPTY;
    new_wp->base.mode &= ~MODE_CURSOR;
    new_wp->base.mode |= MODE_CRLF;
    goto complete;
  }
  new_wp->flags &= ~PANE_EMPTY;

  /* Store current working directory and change to new one. */
  if (getcwd(path, sizeof path) != NULL) {
    if (chdir(new_wp->cwd) == 0)
      actual_cwd = new_wp->cwd;
    else if (home != NULL && chdir(home) == 0)
      actual_cwd = home;
    else if (chdir("/") == 0)
      actual_cwd = "/";
  }

  /* Fork the new process. */
  new_wp->pid = fdforkpty(ptm_fd, &new_wp->fd, new_wp->tty, NULL, &ws);
  if (new_wp->pid == -1) {
    xasprintf(cause, "fork failed: %s", strerror(errno));
    new_wp->fd = -1;
    if (~sc->flags & SPAWN_RESPAWN) {
      server_client_remove_pane(new_wp);
      layout_close_pane(new_wp);
      window_remove_pane(w, new_wp);
    }
    sigprocmask(SIG_SETMASK, &oldset, NULL);
    environ_free(child);
    return (NULL);
  }

  /*
   * In the parent process, everything is done now. Change the working
   * directory back.
   */
  if (new_wp->pid != 0) {
    if (actual_cwd != NULL &&
        chdir(path) != 0 &&
        (home == NULL || chdir(home) != 0))
      chdir("/");
    goto complete;
  }

#if defined(HAVE_SYSTEMD) && defined(ENABLE_CGROUPS)
  /*
   * Move the child process into a new cgroup for systemd-oomd isolation.
   */
  if (systemd_move_to_new_cgroup(cause) < 0) {
    log_debug("%s: moving pane to new cgroup failed: %s",
        __func__, *cause);
    free (*cause);
  }
#endif
  /*
   * Child process. Set PWD to the working directory.
   */
  if (actual_cwd != NULL)
    environ_set(child, "PWD", 0, "%s", actual_cwd);

  /*
   * Update terminal escape characters from the session if available and
   * force VERASE to tmux's backspace.
   */
  if (tcgetattr(STDIN_FILENO, &now) != 0)
    _exit(1);
  if (s->tio != NULL)
    memcpy(now.c_cc, s->tio->c_cc, sizeof now.c_cc);
  key = options_get_number(global_options, "backspace");
  if (key >= 0x7f)
    now.c_cc[VERASE] = '\177';
  else
    now.c_cc[VERASE] = key;
#ifdef IUTF8
  now.c_iflag |= IUTF8;
#endif
  if (tcsetattr(STDIN_FILENO, TCSANOW, &now) != 0)
    _exit(1);

  /* Clean up file descriptors and signals and update the environment. */
  proc_clear_signals(server_proc, 1);
  closefrom(STDERR_FILENO + 1);
  sigprocmask(SIG_SETMASK, &oldset, NULL);
  log_close();
  environ_push(child);

  /*
   * If given multiple arguments, use execvp(). Copy the arguments to
   * ensure they end in a NULL.
   */
  if (new_wp->argc != 0 && new_wp->argc != 1) {
    argvp = cmd_copy_argv(new_wp->argc, new_wp->argv);
    execvp(argvp[0], argvp);
    _exit(1);
  }

  /*
   * If one argument, pass it to $SHELL -c. Otherwise create a login
   * shell.
   */
  cp = strrchr(new_wp->shell, '/');
  if (new_wp->argc == 1) {
    tmp = new_wp->argv[0];
    if (cp != NULL && cp[1] != '\0')
      xasprintf(&argv0, "%s", cp + 1);
    else
      xasprintf(&argv0, "%s", new_wp->shell);
    execl(new_wp->shell, argv0, "-c", tmp, (char *)NULL);
    _exit(1);
  }
  if (cp != NULL && cp[1] != '\0')
    xasprintf(&argv0, "-%s", cp + 1);
  else
    xasprintf(&argv0, "-%s", new_wp->shell);
  execl(new_wp->shell, argv0, (char *)NULL);
  _exit(1);

complete:
#ifdef HAVE_UTEMPTER
  if (~new_wp->flags & PANE_EMPTY) {
    xasprintf(&cp, "tmux(%lu).%%%u", (long)getpid(), new_wp->id);
    utempter_add_record(new_wp->fd, cp);
    kill(getpid(), SIGCHLD);
    free(cp);
  }
#endif

  new_wp->flags &= ~PANE_EXITED;

  sigprocmask(SIG_SETMASK, &oldset, NULL);
  window_pane_set_event(new_wp);
  environ_free(child);
  spawn_fire_pane_created(sc, new_wp);

  if (sc->flags & SPAWN_RESPAWN)
    return (new_wp);
  if (sc->flags & SPAWN_MODAL) {
    w->modal_last = w->active;
    w->modal = new_wp;
    window_redraw_active_switch(w, new_wp);
    if (sc->flags & SPAWN_NONOTIFY)
      window_set_active_pane(w, new_wp, 0);
    else
      window_set_active_pane(w, new_wp, 1);
  } else if (((~sc->flags & SPAWN_DETACHED) || w->active == NULL) &&
      w->modal == NULL) {
    if (sc->flags & SPAWN_NONOTIFY)
      window_set_active_pane(w, new_wp, 0);
    else
      window_set_active_pane(w, new_wp, 1);
  }
  if (~sc->flags & SPAWN_NONOTIFY)
    events_fire_window("window-layout-changed", w);
  return (new_wp);
}

struct spawn_editor_state {
  char      *path;
  pid_t      pid;
  spawn_finish_edit_cb   cb;
  void      *arg;
};

static void
spawn_editor_free(struct spawn_editor_state *es)
{
  unlink(es->path);
  free(es->path);
  free(es);
}

void
spawn_cancel_editor(struct spawn_editor_state *es)
{
  if (es == NULL)
    return;
  es->cb = NULL;
  es->arg = NULL;
}

pid_t
spawn_get_editor_pid(struct spawn_editor_state *es)
{
  if (es == NULL)
    return (-1);
  return (es->pid);
}

void
spawn_editor_finish(struct window_pane *wp)
{
  struct spawn_editor_state *es = wp->editor;
  FILE        *f;
  char        *buf = NULL;
  off_t        len = 0;
  int        status = 128 + SIGHUP;

  if (es == NULL)
    return;
  wp->editor = NULL;

  if (wp->flags & PANE_STATUSREADY) {
    if (WIFEXITED(wp->status))
      status = WEXITSTATUS(wp->status);
    else if (WIFSIGNALED(wp->status))
      status = WTERMSIG(wp->status) + 128;
  }

  if (es->cb == NULL) {
    spawn_editor_free(es);
    return;
  }
  if (status != 0) {
    es->cb(NULL, 0, es->arg);
    spawn_editor_free(es);
    return;
  }

  f = fopen(es->path, "r");
  if (f != NULL) {
    if (fseeko(f, 0, SEEK_END) == 0) {
      len = ftello(f);
      if (len > 0 && (uintmax_t)len <= (uintmax_t)SIZE_MAX) {
        if (fseeko(f, 0, SEEK_SET) == 0) {
          buf = malloc(len);
          if (buf != NULL &&
              fread(buf, len, 1, f) != 1) {
            free(buf);
            buf = NULL;
            len = 0;
          }
        }
      } else
        len = 0;
    }
    fclose(f);
  }

  es->cb(buf, len, es->arg);
  spawn_editor_free(es);
}

struct spawn_editor_state *
spawn_editor(struct client *c, const char *buf, size_t len,
    spawn_finish_edit_cb cb, void *arg)
{
  struct spawn_editor_state *es;
  struct spawn_context     sc = { 0 };
  struct session      *s = c->session;
  struct winlink      *wl = s->curw;
  struct window     *w = wl->window;
  struct window_pane    *wp;
  struct layout_cell    *lc;
  struct layout_geometry     lg;
  struct environ      *env;
  FILE        *f;
  char        *cmd, *cause = NULL;
  char         path[] = _PATH_TMP "tmux.XXXXXXXX";
  const char      *editor;
  int        fd;

  if (w->modal != NULL)
    return (NULL);

  editor = options_get_string(global_options, "editor");
  fd = mkstemp(path);
  if (fd == -1)
    return (NULL);
  f = fdopen(fd, "w");
  if (f == NULL) {
    close(fd);
    unlink(path);
    return (NULL);
  }
  if (fwrite(buf, len, 1, f) != 1) {
    fclose(f);
    unlink(path);
    return (NULL);
  }
  fclose(f);

  es = xcalloc(1, sizeof *es);
  es->path = xstrdup(path);
  es->cb = cb;
  es->arg = arg;

  lg.sx = w->sx * 9 / 10;
  lg.sy = w->sy * 9 / 10;
  lg.xoff = w->sx / 2 - lg.sx / 2;
  lg.yoff = w->sy / 2 - lg.sy / 2;
  window_push_modal_zoom(w);
  lc = layout_floating_pane(w, NULL, &lg);
  if (lc == NULL) {
    window_pop_modal_zoom(w);
    spawn_editor_free(es);
    return (NULL);
  }

  xasprintf(&cmd, "%s %s", editor, path);
  env = environ_create();
  sc.s = s;
  sc.wl = wl;
  sc.tc = c;
  sc.wp0 = w->active;
  sc.lc = lc;
  sc.argc = 1;
  sc.argv = &cmd;
  sc.environ = env;
  sc.idx = -1;
  sc.cwd = _PATH_TMP;
  sc.flags = SPAWN_FLOATING|SPAWN_MODAL;

  wp = spawn_pane(&sc, &cause);
  free(cmd);
  environ_free(env);
  if (wp == NULL) {
    free(cause);
    window_pop_modal_zoom(w);
    spawn_editor_free(es);
    return (NULL);
  }
  options_set_number(wp->options, "remain-on-exit", 0);
  es->pid = wp->pid;
  wp->editor = es;
  return (es);
}

Coverage Report

Created: 2026-08-13 06:07