ipc.c

minicom的源码,linux下常用的串口程序.

/*
 * ipc.c	talk to the keyserv process.
 *
 *		Entry point:
 *
 *		keyserv(command, arg)
 *		command can be KINSTALL, KUNINSTALL, or a command for keyserv.
 *		arg is a 1 byte argument.
 *
 *		This file is part of the minicom communications package,
 *		Copyright 1991-1995 Miquel van Smoorenburg.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "rcsid.h"
RCSID("$Id: ipc.c,v 1.9 2005/10/31 10:31:38 al-guest Exp $")

#include <strings.h>

#include "port.h"
#include "minicom.h"
#include "intl.h"

/* Check if there is IO pending. */
int check_io(int fd1, int fd2, int tmout, char *buf, int *buflen)
{
  int n = 0, i;
  struct timeval tv;
  fd_set fds;

  tv.tv_sec = tmout / 1000;
  tv.tv_usec = (tmout % 1000) * 1000L;

  i = fd1;
  if (fd2 > fd1)
    i = fd2;

  FD_ZERO(&fds);
  if (fd1 >= 0)
    FD_SET(fd1, &fds); else fd1 = 0;
  if (fd2 >= 0)
    FD_SET(fd2, &fds); else fd2 = 0;

  if (fd2 == 0 && io_pending)
    n = 2;
  else if (select(i+1, &fds, NULL, NULL, &tv) > 0)
    n = 1 * (FD_ISSET(fd1, &fds) > 0) + 2 * (FD_ISSET(fd2, &fds) > 0);

  /* If there is data put it in the buffer. */
  if (buf) {
    i = 0;
    if ((n & 1) == 1) {
      i = read(fd1, buf, 127);
#ifdef USE_SOCKET
      if (!i && portfd_is_socket && portfd == fd1)
        term_socket_close();
#endif /* USE_SOCKET */
    }
    buf[i > 0 ? i : 0] = 0;
    if (buflen)
      *buflen = i;
  }

  return(n);
}

int keyboard(int cmd, int arg)
{
  switch (cmd) {
    case KSTART:
    case KSTOP:
      break;
    case KSIGIO:
      break;
    case KGETKEY:
      return wxgetch();
    case KSETESC:
      escape = arg;
      break;
    case KSETBS:
      vt_set(-1, -1, NULL, -1, arg, -1, -1, -1);
      break;
    case KCURST:
      vt_set(-1, -1, NULL, -1, -1, -1, NORMAL, -1);
      break;
    case KCURAPP:
      vt_set(-1, -1, NULL, -1, -1, -1, APPL, -1);
      break;
    default:
      /* The rest is only meaningful if a keyserv runs. */
      break;
  }
  return 0;
}