1221420Sdes/* $OpenBSD: atomicio.c,v 1.26 2010/09/22 22:58:51 djm 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> 44162852Sdes 4576259Sgreen#include "atomicio.h" 4657429Smarkm 4757429Smarkm/* 48124208Sdes * ensure all of data on socket comes through. f==read || f==vwrite 4957429Smarkm */ 50149749Sdessize_t 51221420Sdesatomicio6(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n, 52221420Sdes int (*cb)(void *, size_t), void *cb_arg) 5357429Smarkm{ 5458582Skris char *s = _s; 55149749Sdes size_t pos = 0; 56149749Sdes ssize_t res; 57181111Sdes struct pollfd pfd; 5857429Smarkm 59181111Sdes pfd.fd = fd; 60181111Sdes pfd.events = f == read ? POLLIN : POLLOUT; 6157429Smarkm while (n > pos) { 6257429Smarkm res = (f) (fd, s + pos, n - pos); 6357429Smarkm switch (res) { 6457429Smarkm case -1: 65181111Sdes if (errno == EINTR) 6657429Smarkm continue; 67181111Sdes if (errno == EAGAIN || errno == EWOULDBLOCK) { 68181111Sdes (void)poll(&pfd, 1, -1); 69181111Sdes continue; 70181111Sdes } 71149749Sdes return 0; 7257429Smarkm case 0: 73149749Sdes errno = EPIPE; 74149749Sdes return pos; 7557429Smarkm default: 76162852Sdes pos += (size_t)res; 77221420Sdes if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { 78221420Sdes errno = EINTR; 79221420Sdes return pos; 80221420Sdes } 8157429Smarkm } 8257429Smarkm } 83221420Sdes return pos; 8457429Smarkm} 85162852Sdes 86221420Sdessize_t 87221420Sdesatomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) 88221420Sdes{ 89221420Sdes return atomicio6(f, fd, _s, n, NULL, NULL); 90221420Sdes} 91221420Sdes 92162852Sdes/* 93162852Sdes * ensure all of data on socket comes through. f==readv || f==writev 94162852Sdes */ 95162852Sdessize_t 96221420Sdesatomiciov6(ssize_t (*f) (int, const struct iovec *, int), int fd, 97221420Sdes const struct iovec *_iov, int iovcnt, 98221420Sdes int (*cb)(void *, size_t), void *cb_arg) 99162852Sdes{ 100162852Sdes size_t pos = 0, rem; 101162852Sdes ssize_t res; 102162852Sdes struct iovec iov_array[IOV_MAX], *iov = iov_array; 103181111Sdes struct pollfd pfd; 104162852Sdes 105162852Sdes if (iovcnt > IOV_MAX) { 106162852Sdes errno = EINVAL; 107162852Sdes return 0; 108162852Sdes } 109162852Sdes /* Make a copy of the iov array because we may modify it below */ 110162852Sdes memcpy(iov, _iov, iovcnt * sizeof(*_iov)); 111162852Sdes 112181111Sdes#ifndef BROKEN_READV_COMPARISON 113181111Sdes pfd.fd = fd; 114181111Sdes pfd.events = f == readv ? POLLIN : POLLOUT; 115181111Sdes#endif 116162852Sdes for (; iovcnt > 0 && iov[0].iov_len > 0;) { 117162852Sdes res = (f) (fd, iov, iovcnt); 118162852Sdes switch (res) { 119162852Sdes case -1: 120181111Sdes if (errno == EINTR) 121162852Sdes continue; 122181111Sdes if (errno == EAGAIN || errno == EWOULDBLOCK) { 123181111Sdes#ifndef BROKEN_READV_COMPARISON 124181111Sdes (void)poll(&pfd, 1, -1); 125181111Sdes#endif 126181111Sdes continue; 127181111Sdes } 128162852Sdes return 0; 129162852Sdes case 0: 130162852Sdes errno = EPIPE; 131162852Sdes return pos; 132162852Sdes default: 133162852Sdes rem = (size_t)res; 134162852Sdes pos += rem; 135162852Sdes /* skip completed iov entries */ 136162852Sdes while (iovcnt > 0 && rem >= iov[0].iov_len) { 137162852Sdes rem -= iov[0].iov_len; 138162852Sdes iov++; 139162852Sdes iovcnt--; 140162852Sdes } 141162852Sdes /* This shouldn't happen... */ 142162852Sdes if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) { 143162852Sdes errno = EFAULT; 144162852Sdes return 0; 145162852Sdes } 146162852Sdes if (iovcnt == 0) 147162852Sdes break; 148162852Sdes /* update pointer in partially complete iov */ 149162852Sdes iov[0].iov_base = ((char *)iov[0].iov_base) + rem; 150162852Sdes iov[0].iov_len -= rem; 151162852Sdes } 152221420Sdes if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { 153221420Sdes errno = EINTR; 154221420Sdes return pos; 155221420Sdes } 156162852Sdes } 157162852Sdes return pos; 158162852Sdes} 159221420Sdes 160221420Sdessize_t 161221420Sdesatomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd, 162221420Sdes const struct iovec *_iov, int iovcnt) 163221420Sdes{ 164221420Sdes return atomiciov6(f, fd, _iov, iovcnt, NULL, NULL); 165221420Sdes} 166