1295367Sdes/* $OpenBSD: atomicio.c,v 1.27 2015/01/16 06:40:12 deraadt Exp $ */ 257429Smarkm/* 3162852Sdes * Copyright (c) 2006 Damien Miller. All rights reserved. 4149749Sdes * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. 576259Sgreen * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. 657429Smarkm * All rights reserved. 757429Smarkm * 857429Smarkm * Redistribution and use in source and binary forms, with or without 957429Smarkm * modification, are permitted provided that the following conditions 1057429Smarkm * are met: 1157429Smarkm * 1. Redistributions of source code must retain the above copyright 1257429Smarkm * notice, this list of conditions and the following disclaimer. 1357429Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1457429Smarkm * notice, this list of conditions and the following disclaimer in the 1557429Smarkm * documentation and/or other materials provided with the distribution. 1657429Smarkm * 1757429Smarkm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1857429Smarkm * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1957429Smarkm * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2057429Smarkm * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2157429Smarkm * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2257429Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2357429Smarkm * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2457429Smarkm * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2557429Smarkm * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2657429Smarkm * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2757429Smarkm */ 2857429Smarkm 2957429Smarkm#include "includes.h" 3057429Smarkm 31162852Sdes#include <sys/param.h> 32162852Sdes#include <sys/uio.h> 33162852Sdes 34162852Sdes#include <errno.h> 35181111Sdes#ifdef HAVE_POLL_H 36181111Sdes#include <poll.h> 37181111Sdes#else 38181111Sdes# ifdef HAVE_SYS_POLL_H 39181111Sdes# include <sys/poll.h> 40181111Sdes# endif 41181111Sdes#endif 42162852Sdes#include <string.h> 43181111Sdes#include <unistd.h> 44295367Sdes#include <limits.h> 45162852Sdes 4676259Sgreen#include "atomicio.h" 4757429Smarkm 4857429Smarkm/* 49124208Sdes * ensure all of data on socket comes through. f==read || f==vwrite 5057429Smarkm */ 51149749Sdessize_t 52221420Sdesatomicio6(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n, 53221420Sdes int (*cb)(void *, size_t), void *cb_arg) 5457429Smarkm{ 5558582Skris char *s = _s; 56149749Sdes size_t pos = 0; 57149749Sdes ssize_t res; 58181111Sdes struct pollfd pfd; 5957429Smarkm 60262566Sdes#ifndef BROKEN_READ_COMPARISON 61181111Sdes pfd.fd = fd; 62181111Sdes pfd.events = f == read ? POLLIN : POLLOUT; 63262566Sdes#endif 6457429Smarkm while (n > pos) { 6557429Smarkm res = (f) (fd, s + pos, n - pos); 6657429Smarkm switch (res) { 6757429Smarkm case -1: 68181111Sdes if (errno == EINTR) 6957429Smarkm continue; 70181111Sdes if (errno == EAGAIN || errno == EWOULDBLOCK) { 71262566Sdes#ifndef BROKEN_READ_COMPARISON 72181111Sdes (void)poll(&pfd, 1, -1); 73262566Sdes#endif 74181111Sdes continue; 75181111Sdes } 76149749Sdes return 0; 7757429Smarkm case 0: 78149749Sdes errno = EPIPE; 79149749Sdes return pos; 8057429Smarkm default: 81162852Sdes pos += (size_t)res; 82221420Sdes if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { 83221420Sdes errno = EINTR; 84221420Sdes return pos; 85221420Sdes } 8657429Smarkm } 8757429Smarkm } 88221420Sdes return pos; 8957429Smarkm} 90162852Sdes 91221420Sdessize_t 92221420Sdesatomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) 93221420Sdes{ 94221420Sdes return atomicio6(f, fd, _s, n, NULL, NULL); 95221420Sdes} 96221420Sdes 97162852Sdes/* 98162852Sdes * ensure all of data on socket comes through. f==readv || f==writev 99162852Sdes */ 100162852Sdessize_t 101221420Sdesatomiciov6(ssize_t (*f) (int, const struct iovec *, int), int fd, 102221420Sdes const struct iovec *_iov, int iovcnt, 103221420Sdes int (*cb)(void *, size_t), void *cb_arg) 104162852Sdes{ 105162852Sdes size_t pos = 0, rem; 106162852Sdes ssize_t res; 107162852Sdes struct iovec iov_array[IOV_MAX], *iov = iov_array; 108181111Sdes struct pollfd pfd; 109162852Sdes 110162852Sdes if (iovcnt > IOV_MAX) { 111162852Sdes errno = EINVAL; 112162852Sdes return 0; 113162852Sdes } 114162852Sdes /* Make a copy of the iov array because we may modify it below */ 115162852Sdes memcpy(iov, _iov, iovcnt * sizeof(*_iov)); 116162852Sdes 117181111Sdes#ifndef BROKEN_READV_COMPARISON 118181111Sdes pfd.fd = fd; 119181111Sdes pfd.events = f == readv ? POLLIN : POLLOUT; 120181111Sdes#endif 121162852Sdes for (; iovcnt > 0 && iov[0].iov_len > 0;) { 122162852Sdes res = (f) (fd, iov, iovcnt); 123162852Sdes switch (res) { 124162852Sdes case -1: 125181111Sdes if (errno == EINTR) 126162852Sdes continue; 127181111Sdes if (errno == EAGAIN || errno == EWOULDBLOCK) { 128181111Sdes#ifndef BROKEN_READV_COMPARISON 129181111Sdes (void)poll(&pfd, 1, -1); 130181111Sdes#endif 131181111Sdes continue; 132181111Sdes } 133162852Sdes return 0; 134162852Sdes case 0: 135162852Sdes errno = EPIPE; 136162852Sdes return pos; 137162852Sdes default: 138162852Sdes rem = (size_t)res; 139162852Sdes pos += rem; 140162852Sdes /* skip completed iov entries */ 141162852Sdes while (iovcnt > 0 && rem >= iov[0].iov_len) { 142162852Sdes rem -= iov[0].iov_len; 143162852Sdes iov++; 144162852Sdes iovcnt--; 145162852Sdes } 146162852Sdes /* This shouldn't happen... */ 147162852Sdes if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) { 148162852Sdes errno = EFAULT; 149162852Sdes return 0; 150162852Sdes } 151162852Sdes if (iovcnt == 0) 152162852Sdes break; 153162852Sdes /* update pointer in partially complete iov */ 154162852Sdes iov[0].iov_base = ((char *)iov[0].iov_base) + rem; 155162852Sdes iov[0].iov_len -= rem; 156162852Sdes } 157221420Sdes if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { 158221420Sdes errno = EINTR; 159221420Sdes return pos; 160221420Sdes } 161162852Sdes } 162162852Sdes return pos; 163162852Sdes} 164221420Sdes 165221420Sdessize_t 166221420Sdesatomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd, 167221420Sdes const struct iovec *_iov, int iovcnt) 168221420Sdes{ 169221420Sdes return atomiciov6(f, fd, _iov, iovcnt, NULL, NULL); 170221420Sdes} 171