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Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.23

1.23    ! deraadt     1: /* $OpenBSD: atomicio.c,v 1.22 2006/07/26 02:35:17 stevesk 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:
1.22      stevesk    29: #include <sys/param.h>
1.23    ! deraadt    30: #include <sys/uio.h>
1.20      stevesk    31:
                     32: #include <errno.h>
1.21      stevesk    33: #include <string.h>
1.1       deraadt    34:
1.8       markus     35: #include "atomicio.h"
1.1       deraadt    36:
                     37: /*
1.12      avsm       38:  * ensure all of data on socket comes through. f==read || f==vwrite
1.1       deraadt    39:  */
1.13      avsm       40: size_t
1.17      djm        41: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1       deraadt    42: {
1.3       markus     43:        char *s = _s;
1.13      avsm       44:        size_t pos = 0;
                     45:        ssize_t res;
1.1       deraadt    46:
                     47:        while (n > pos) {
                     48:                res = (f) (fd, s + pos, n - pos);
                     49:                switch (res) {
                     50:                case -1:
                     51:                        if (errno == EINTR || errno == EAGAIN)
                     52:                                continue;
1.13      avsm       53:                        return 0;
1.1       deraadt    54:                case 0:
1.13      avsm       55:                        errno = EPIPE;
                     56:                        return pos;
1.1       deraadt    57:                default:
1.14      otto       58:                        pos += (size_t)res;
1.1       deraadt    59:                }
                     60:        }
                     61:        return (pos);
1.18      djm        62: }
                     63:
                     64: /*
                     65:  * ensure all of data on socket comes through. f==readv || f==writev
                     66:  */
                     67: size_t
                     68: atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
                     69:     const struct iovec *_iov, int iovcnt)
                     70: {
                     71:        size_t pos = 0, rem;
                     72:        ssize_t res;
                     73:        struct iovec iov_array[IOV_MAX], *iov = iov_array;
                     74:
                     75:        if (iovcnt > IOV_MAX) {
                     76:                errno = EINVAL;
                     77:                return 0;
                     78:        }
                     79:        /* Make a copy of the iov array because we may modify it below */
                     80:        memcpy(iov, _iov, iovcnt * sizeof(*_iov));
                     81:
                     82:        for (; iovcnt > 0 && iov[0].iov_len > 0;) {
                     83:                res = (f) (fd, iov, iovcnt);
                     84:                switch (res) {
                     85:                case -1:
                     86:                        if (errno == EINTR || errno == EAGAIN)
                     87:                                continue;
                     88:                        return 0;
                     89:                case 0:
                     90:                        errno = EPIPE;
                     91:                        return pos;
                     92:                default:
                     93:                        rem = (size_t)res;
                     94:                        pos += rem;
                     95:                        /* skip completed iov entries */
                     96:                        while (iovcnt > 0 && rem >= iov[0].iov_len) {
                     97:                                rem -= iov[0].iov_len;
                     98:                                iov++;
                     99:                                iovcnt--;
                    100:                        }
                    101:                        /* This shouldn't happen... */
1.19      djm       102:                        if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
1.18      djm       103:                                errno = EFAULT;
                    104:                                return 0;
                    105:                        }
                    106:                        if (iovcnt == 0)
                    107:                                break;
                    108:                        /* update pointer in partially complete iov */
                    109:                        iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
                    110:                        iov[0].iov_len -= rem;
                    111:                }
                    112:        }
                    113:        return pos;
1.1       deraadt   114: }