version 1.14.2.1, 2006/09/30 04:06:50 |
version 1.15, 2006/03/19 18:51:18 |
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/* $OpenBSD$ */ |
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/* |
/* |
* Copyright (c) 2006 Damien Miller. All rights reserved. |
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* Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. |
* Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. |
* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. |
* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. |
* All rights reserved. |
* All rights reserved. |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
*/ |
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#include <sys/param.h> |
#include "includes.h" |
#include <sys/uio.h> |
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#include <errno.h> |
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#include <string.h> |
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#include "atomicio.h" |
#include "atomicio.h" |
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/* |
/* |
* ensure all of data on socket comes through. f==read || f==vwrite |
* ensure all of data on socket comes through. f==read || f==vwrite |
*/ |
*/ |
size_t |
size_t |
atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) |
atomicio(f, fd, _s, n) |
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ssize_t (*f) (int, void *, size_t); |
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int fd; |
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void *_s; |
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size_t n; |
{ |
{ |
char *s = _s; |
char *s = _s; |
size_t pos = 0; |
size_t pos = 0; |
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} |
} |
} |
} |
return (pos); |
return (pos); |
} |
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/* |
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* ensure all of data on socket comes through. f==readv || f==writev |
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*/ |
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size_t |
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atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd, |
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const struct iovec *_iov, int iovcnt) |
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{ |
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size_t pos = 0, rem; |
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ssize_t res; |
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struct iovec iov_array[IOV_MAX], *iov = iov_array; |
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if (iovcnt > IOV_MAX) { |
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errno = EINVAL; |
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return 0; |
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} |
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/* Make a copy of the iov array because we may modify it below */ |
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memcpy(iov, _iov, iovcnt * sizeof(*_iov)); |
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for (; iovcnt > 0 && iov[0].iov_len > 0;) { |
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res = (f) (fd, iov, iovcnt); |
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switch (res) { |
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case -1: |
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if (errno == EINTR || errno == EAGAIN) |
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continue; |
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return 0; |
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case 0: |
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errno = EPIPE; |
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return pos; |
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default: |
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rem = (size_t)res; |
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pos += rem; |
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/* skip completed iov entries */ |
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while (iovcnt > 0 && rem >= iov[0].iov_len) { |
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rem -= iov[0].iov_len; |
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iov++; |
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iovcnt--; |
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} |
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/* This shouldn't happen... */ |
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if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) { |
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errno = EFAULT; |
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return 0; |
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} |
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if (iovcnt == 0) |
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break; |
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/* update pointer in partially complete iov */ |
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iov[0].iov_base = ((char *)iov[0].iov_base) + rem; |
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iov[0].iov_len -= rem; |
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} |
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} |
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return pos; |
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} |
} |