03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk/* $OpenBSD: atomicio.c,v 1.9 2007/09/07 14:50:44 tobias Exp $ */
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk/*
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * Copyright (c) 2006 Damien Miller. All rights reserved.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * All rights reserved.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk *
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * Redistribution and use in source and binary forms, with or without
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * modification, are permitted provided that the following conditions
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * are met:
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * 1. Redistributions of source code must retain the above copyright
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * notice, this list of conditions and the following disclaimer.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * 2. Redistributions in binary form must reproduce the above copyright
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * notice, this list of conditions and the following disclaimer in the
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * documentation and/or other materials provided with the distribution.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk *
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk */
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk#pragma ident "%Z%%M% %I% %E% SMI"
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk#include <sys/param.h>
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk#include <errno.h>
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk#include <poll.h>
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk#include <unistd.h>
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk#include "atomicio.h"
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk/*
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk * ensure all of data on socket comes through. f==read || f==vwrite
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk */
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vksize_t
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vkatomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk{
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk char *s = _s;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk size_t pos = 0;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk ssize_t res;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk struct pollfd pfd;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk pfd.fd = fd;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk pfd.events = f == read ? POLLIN : POLLOUT;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk while (n > pos) {
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk res = (f) (fd, s + pos, n - pos);
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk switch (res) {
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk case -1:
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk if (errno == EINTR)
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk continue;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk if (errno == EAGAIN) {
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk (void) poll(&pfd, 1, -1);
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk continue;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk }
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk return (0);
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk case 0:
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk errno = EPIPE;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk return (pos);
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk default:
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk pos += (size_t)res;
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk }
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk }
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk return (pos);
03100a6332bd4edc7a53091fcf7c9a7131bcdaa7vk}