text: /*
   * mish_capture_select.c
   *
   * Copyright (C) 2020 Michel Pollet <buserror@gmail.com>
   *
   * SPDX-License-Identifier: Apache-2.0
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <errno.h>
  #include "mish_priv.h"
  #include "mish.h"
  
  /*
   * This is a select() based capture thread, it's not /ideal/ in terms of
   * performances, but it's portable and should work on OSX/BSD Linux etc.
   */
  void *
  _mish_capture_select(
  		void *param)
  {
  	mish_p m = param;
  
  	while (!(m->flags & MISH_QUIT)) {
  		mish_client_p c;
  		/*
  		 * Call each client state machine, handle new output,
  		 * new input, draw prompts etc etc.
  		 * Also allow clients to tweak their 'output request' flag here
  		 */
  		TAILQ_FOREACH(c, &m->clients, self)
  			c->cr.process(m, c);
  
  		fd_set r = m->select.read;
  		fd_set w = m->select.write;
  		struct timeval tv = { .tv_sec = 1 };
  		int max = select(m->select.max, &r, &w, NULL, &tv);
  		if (max == 0)
  			continue;
  		if (max == -1) {
  			if (errno == EINTR || errno == EAGAIN)
  				continue;
  			// real error here?
  			continue;
  		}
  		/* check the telnet listen socket */
  		mish_telnet_in_check(m, &r);
  		/*
  		 * Get any input from the original terminals, it has been split
  		 * into lines already and queue all into the main backlog.
  		 */
  		for (int i = 0; i < 1 + !(m->flags & MISH_CAP_NO_STDERR); i++) {
  			_mish_input_read(m, &r, &m->origin[i]);
  
  			mish_line_p l;
  			while ((l = TAILQ_FIRST(&m->origin[i].backlog)) != NULL) {
  				l->err = i == 1;	// mark stderr as such
  				TAILQ_REMOVE(&m->origin[i].backlog, l, self);
  				TAILQ_INSERT_TAIL(&m->backlog.log, l, self);
  				m->backlog.size++;
  				m->backlog.alloc += sizeof(*l) + l->size;
  			}
  		}
  		mish_client_p safe;
  		// check if any client has input, or was closed down, and remove them
  		TAILQ_FOREACH_SAFE(c, &m->clients, self, safe) {
  			_mish_input_read(m, &r, &c->input);
  			if (c->input.fd == -1 || (c->flags & MISH_CLIENT_DELETE))
  				mish_client_delete(m, c);
  		}
  	}
  	if ((m->flags & MISH_CONSOLE_TTY) &&
  			tcsetattr(0, TCSAFLUSH, &m->orig_termios))
  		perror("thread tcsetattr");
  	/*
  	 * Try to be nice and tell all clients to cleanup
  	 */
  	mish_client_p c;
  	while ((c = TAILQ_FIRST(&m->clients)) != NULL)
  		mish_client_delete(m, c);
  	m->flags &= ~MISH_QUIT;
  	m->capture = 0;	// mark the thread done
  	exit(0);	// this calls mish_terminate, on main thread
  //	return NULL;
  }
  