Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.13.2.1
1.13.2.1! brad 1: /* $OpenBSD: atomicio.c,v 1.23 2006/08/03 03:34:41 deraadt Exp $ */
1.1 deraadt 2: /*
1.13.2.1! brad 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:
1.13.2.1! brad 29: #include <sys/param.h>
! 30: #include <sys/uio.h>
! 31:
! 32: #include <errno.h>
! 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
1.13.2.1! brad 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:
1.13.2.1! brad 58: pos += (size_t)res;
1.1 deraadt 59: }
60: }
61: return (pos);
1.13.2.1! brad 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... */
! 102: if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
! 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: }