send_exit.c

来自「OTP是开放电信平台的简称」· C语言 代码 · 共 101 行

/* ``The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved via the world wide web at http://www.erlang.org/.
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Original Code is Ericsson Utvecklings AB.
 * Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
 * AB. All Rights Reserved.''
 * 
 *     $Id$
 */
#ifdef __WIN32__
# include <winsock2.h>
# include <windows.h>
# include <winbase.h>
#else /* Unix/VxWorks */
#include <unistd.h>
#endif

#include <string.h>
#include <stdlib.h>
#include "eidef.h"
#include "eiext.h"
#include "eisend.h"
#include "ei_connect_int.h"
#include "ei_trace.h"
#include "ei_internal.h"
#include "putget.h"
#include "ei_portio.h"
#include "show_msg.h"

/* use this to break a link */
int ei_send_exit(int fd, const erlang_pid *from, 
		 const erlang_pid *to, const char *reason)
{
    return ei_send_exit_tmo(fd,from,to,reason,0);
}


int ei_send_exit_tmo(int fd, const erlang_pid *from, const erlang_pid *to,
		     const char *reason, unsigned ms)
{
  char sbuf[EISMALLBUF];
  erlang_trace *token = NULL;
  char *dbuf = NULL;
  char *msgbuf;
  char *s;
  int index = 0;
  int len = strlen(reason) + 1080; /* see below */

  if (len > EISMALLBUF)
    if (!(dbuf = malloc(index)))
      return -1;
  msgbuf = (dbuf ? dbuf : sbuf);


  /* are we tracing? */
  /* check that he can receive trace tokens first */
  if (ei_distversion(fd) > 0) token = ei_trace(0,NULL);

  index = 5;                                     /* max sizes: */
  ei_encode_version(msgbuf,&index);                     /*   1 */
  if (token) {
    ei_encode_tuple_header(msgbuf,&index,5);            /*   2 */
    ei_encode_long(msgbuf,&index,ERL_EXIT_TT);          /*   2 */
  }
  else {
    ei_encode_tuple_header(msgbuf,&index,4);
    ei_encode_long(msgbuf,&index,ERL_EXIT);
  }
  ei_encode_pid(msgbuf,&index,from);                    /* 268 */
  ei_encode_pid(msgbuf,&index,to);                      /* 268 */

  if (token) ei_encode_trace(msgbuf,&index,token);      /* 534 */

  /* Reason */
  ei_encode_string(msgbuf,&index,reason);               /* len */

  /* 5 byte header missing */
  s = msgbuf;
  put32be(s, index - 4);                                /*   4 */
  put8(s, ERL_PASS_THROUGH);                                /*   1 */
                                          /*** sum: len + 1080 */
  /* FIXME incorrect level */
  if (ei_tracelevel > 1)
      ei_show_sendmsg(stderr,msgbuf,NULL);

  ei_write_fill_t(fd,msgbuf,index,ms); 
  /* FIXME ignore timeout etc? erl_errno?! */

  if (dbuf) free(dbuf);
  return 0;
}