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atomicio.c

/* Modified for use in Yafc by Martin Hedenfalk <mhe@stacken.kth.se>
 */

/*
 * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*#include "includes.h"*/
/*RCSID("$OpenBSD: atomicio.c,v 1.9 2001/03/02 18:54:30 deraadt Exp $");*/

#include "syshdr.h"
/*#include "xmalloc.h"*/
#include "atomicio.h"

/*
 * ensure all of data on socket comes through. f==read || f==write
 */
ssize_t
atomicio(f, fd, _s, n)
      ssize_t (*f) ();
      int fd;
      void *_s;
      size_t n;
{
      char *s = _s;
      ssize_t res, pos = 0;

      while (n > pos) {
            res = (f) (fd, s + pos, n - pos);
            switch (res) {
            case -1:
                  if (errno == EINTR || errno == EAGAIN)
                        continue;
            case 0:
                  return (res);
            default:
                  pos += res;
            }
      }
      return (pos);
}

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