| /* $OpenBSD: atomicio.c,v 1.27 2015/01/16 06:40:12 deraadt Exp $ */ |
| /* |
| * Copyright (c) 2006 Damien Miller. All rights reserved. |
| * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. |
| * 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" |
| |
| #include <sys/param.h> |
| #include <sys/uio.h> |
| |
| #include <errno.h> |
| #ifdef HAVE_POLL_H |
| #include <poll.h> |
| #else |
| # ifdef HAVE_SYS_POLL_H |
| # include <sys/poll.h> |
| # endif |
| #endif |
| #include <string.h> |
| #include <unistd.h> |
| #include <limits.h> |
| |
| #include "atomicio.h" |
| |
| /* |
| * ensure all of data on socket comes through. f==read || f==vwrite |
| */ |
| size_t |
| atomicio6(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n, |
| int (*cb)(void *, size_t), void *cb_arg) |
| { |
| char *s = _s; |
| size_t pos = 0; |
| ssize_t res; |
| struct pollfd pfd; |
| |
| #ifndef BROKEN_READ_COMPARISON |
| pfd.fd = fd; |
| pfd.events = f == read ? POLLIN : POLLOUT; |
| #endif |
| while (n > pos) { |
| res = (f) (fd, s + pos, n - pos); |
| switch (res) { |
| case -1: |
| if (errno == EINTR) |
| continue; |
| if (errno == EAGAIN || errno == EWOULDBLOCK) { |
| #ifndef BROKEN_READ_COMPARISON |
| (void)poll(&pfd, 1, -1); |
| #endif |
| continue; |
| } |
| return 0; |
| case 0: |
| errno = EPIPE; |
| return pos; |
| default: |
| pos += (size_t)res; |
| if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { |
| errno = EINTR; |
| return pos; |
| } |
| } |
| } |
| return pos; |
| } |
| |
| size_t |
| atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) |
| { |
| return atomicio6(f, fd, _s, n, NULL, NULL); |
| } |
| |
| /* |
| * ensure all of data on socket comes through. f==readv || f==writev |
| */ |
| size_t |
| atomiciov6(ssize_t (*f) (int, const struct iovec *, int), int fd, |
| const struct iovec *_iov, int iovcnt, |
| int (*cb)(void *, size_t), void *cb_arg) |
| { |
| size_t pos = 0, rem; |
| ssize_t res; |
| struct iovec iov_array[IOV_MAX], *iov = iov_array; |
| struct pollfd pfd; |
| |
| if (iovcnt > IOV_MAX) { |
| errno = EINVAL; |
| return 0; |
| } |
| /* Make a copy of the iov array because we may modify it below */ |
| memcpy(iov, _iov, iovcnt * sizeof(*_iov)); |
| |
| #ifndef BROKEN_READV_COMPARISON |
| pfd.fd = fd; |
| pfd.events = f == readv ? POLLIN : POLLOUT; |
| #endif |
| for (; iovcnt > 0 && iov[0].iov_len > 0;) { |
| res = (f) (fd, iov, iovcnt); |
| switch (res) { |
| case -1: |
| if (errno == EINTR) |
| continue; |
| if (errno == EAGAIN || errno == EWOULDBLOCK) { |
| #ifndef BROKEN_READV_COMPARISON |
| (void)poll(&pfd, 1, -1); |
| #endif |
| continue; |
| } |
| return 0; |
| case 0: |
| errno = EPIPE; |
| return pos; |
| default: |
| rem = (size_t)res; |
| pos += rem; |
| /* skip completed iov entries */ |
| while (iovcnt > 0 && rem >= iov[0].iov_len) { |
| rem -= iov[0].iov_len; |
| iov++; |
| iovcnt--; |
| } |
| /* This shouldn't happen... */ |
| if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) { |
| errno = EFAULT; |
| return 0; |
| } |
| if (iovcnt == 0) |
| break; |
| /* update pointer in partially complete iov */ |
| iov[0].iov_base = ((char *)iov[0].iov_base) + rem; |
| iov[0].iov_len -= rem; |
| } |
| if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { |
| errno = EINTR; |
| return pos; |
| } |
| } |
| return pos; |
| } |
| |
| size_t |
| atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd, |
| const struct iovec *_iov, int iovcnt) |
| { |
| return atomiciov6(f, fd, _iov, iovcnt, NULL, NULL); |
| } |