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Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.18

1.18    ! djm         1: /* $OpenBSD: atomicio.c,v 1.17 2006/04/01 05:51:34 djm Exp $ */
1.1       deraadt     2: /*
1.18    ! djm         3:  * Copyright (c) 2006 Damien Miller. All rights reserved.
1.13      avsm        4:  * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
1.9       deraadt     5:  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
1.1       deraadt     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 "includes.h"
                     30:
1.8       markus     31: #include "atomicio.h"
1.1       deraadt    32:
                     33: /*
1.12      avsm       34:  * ensure all of data on socket comes through. f==read || f==vwrite
1.1       deraadt    35:  */
1.13      avsm       36: size_t
1.17      djm        37: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1       deraadt    38: {
1.3       markus     39:        char *s = _s;
1.13      avsm       40:        size_t pos = 0;
                     41:        ssize_t res;
1.1       deraadt    42:
                     43:        while (n > pos) {
                     44:                res = (f) (fd, s + pos, n - pos);
                     45:                switch (res) {
                     46:                case -1:
                     47:                        if (errno == EINTR || errno == EAGAIN)
                     48:                                continue;
1.13      avsm       49:                        return 0;
1.1       deraadt    50:                case 0:
1.13      avsm       51:                        errno = EPIPE;
                     52:                        return pos;
1.1       deraadt    53:                default:
1.14      otto       54:                        pos += (size_t)res;
1.1       deraadt    55:                }
                     56:        }
                     57:        return (pos);
1.18    ! djm        58: }
        !            59:
        !            60: /*
        !            61:  * ensure all of data on socket comes through. f==readv || f==writev
        !            62:  */
        !            63: size_t
        !            64: atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
        !            65:     const struct iovec *_iov, int iovcnt)
        !            66: {
        !            67:        size_t pos = 0, rem;
        !            68:        ssize_t res;
        !            69:        struct iovec iov_array[IOV_MAX], *iov = iov_array;
        !            70:
        !            71:        if (iovcnt > IOV_MAX) {
        !            72:                errno = EINVAL;
        !            73:                return 0;
        !            74:        }
        !            75:        /* Make a copy of the iov array because we may modify it below */
        !            76:        memcpy(iov, _iov, iovcnt * sizeof(*_iov));
        !            77:
        !            78:        for (; iovcnt > 0 && iov[0].iov_len > 0;) {
        !            79:                res = (f) (fd, iov, iovcnt);
        !            80:                switch (res) {
        !            81:                case -1:
        !            82:                        if (errno == EINTR || errno == EAGAIN)
        !            83:                                continue;
        !            84:                        return 0;
        !            85:                case 0:
        !            86:                        errno = EPIPE;
        !            87:                        return pos;
        !            88:                default:
        !            89:                        rem = (size_t)res;
        !            90:                        pos += rem;
        !            91:                        /* skip completed iov entries */
        !            92:                        while (iovcnt > 0 && rem >= iov[0].iov_len) {
        !            93:                                rem -= iov[0].iov_len;
        !            94:                                iov++;
        !            95:                                iovcnt--;
        !            96:                        }
        !            97:                        /* This shouldn't happen... */
        !            98:                        if (rem > iov[0].iov_len || (rem > 0 && iovcnt <= 0)) {
        !            99:                                errno = EFAULT;
        !           100:                                return 0;
        !           101:                        }
        !           102:                        if (iovcnt == 0)
        !           103:                                break;
        !           104:                        /* update pointer in partially complete iov */
        !           105:                        iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
        !           106:                        iov[0].iov_len -= rem;
        !           107:                }
        !           108:        }
        !           109:        return pos;
1.1       deraadt   110: }