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Annotation of src/usr.bin/cvs/atomicio.c, Revision 1.1

1.1     ! tobias      1: /* $OpenBSD$ */
        !             2: /*
        !             3:  * Copyright (c) 2006 Damien Miller. All rights reserved.
        !             4:  * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
        !             5:  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            18:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            19:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            20:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            21:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            22:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            23:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            24:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            25:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            26:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            27:  */
        !            28:
        !            29: #include <sys/param.h>
        !            30:
        !            31: #include <errno.h>
        !            32: #include <poll.h>
        !            33: #include <unistd.h>
        !            34:
        !            35: #include "atomicio.h"
        !            36:
        !            37: /*
        !            38:  * ensure all of data on socket comes through. f==read || f==vwrite
        !            39:  */
        !            40: size_t
        !            41: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
        !            42: {
        !            43:        char *s = _s;
        !            44:        size_t pos = 0;
        !            45:        ssize_t res;
        !            46:        struct pollfd pfd;
        !            47:
        !            48:        pfd.fd = fd;
        !            49:        pfd.events = f == read ? POLLIN : POLLOUT;
        !            50:        while (n > pos) {
        !            51:                res = (f) (fd, s + pos, n - pos);
        !            52:                switch (res) {
        !            53:                case -1:
        !            54:                        if (errno == EINTR)
        !            55:                                continue;
        !            56:                        if (errno == EAGAIN) {
        !            57:                                (void)poll(&pfd, 1, -1);
        !            58:                                continue;
        !            59:                        }
        !            60:                        return 0;
        !            61:                case 0:
        !            62:                        errno = EPIPE;
        !            63:                        return pos;
        !            64:                default:
        !            65:                        pos += (size_t)res;
        !            66:                }
        !            67:        }
        !            68:        return (pos);
        !            69: }