| /* |
| * Copyright (c) 2002 Marius Aamodt Eriksen <marius@monkey.org> |
| * 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 <sys/types.h> |
| #include <unistd.h> |
| #include <errno.h> |
| |
| /* |
| * ensure all of data on socket comes through. f==read || f==write |
| */ |
| ssize_t atomicio(ssize_t(*f) (int, void *, size_t), int fd, void *_s, size_t n) |
| { |
| char *s = _s; |
| ssize_t res, pos = 0; |
| |
| while ((ssize_t)n > pos) { |
| res = (f) (fd, s + pos, n - pos); |
| switch (res) { |
| case -1: |
| if (errno == EINTR || errno == EAGAIN) |
| continue; |
| case 0: |
| if (pos != 0) |
| return pos; |
| return res; |
| default: |
| pos += res; |
| } |
| } |
| return pos; |
| } |
