version 1.17, 2006/04/01 05:51:34 |
version 1.18, 2006/04/16 00:52:55 |
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/* $OpenBSD$ */ |
/* $OpenBSD$ */ |
/* |
/* |
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* Copyright (c) 2006 Damien Miller. All rights reserved. |
* 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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} |
} |
} |
} |
return (pos); |
return (pos); |
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} |
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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 > iov[0].iov_len || (rem > 0 && iovcnt <= 0)) { |
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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; |
} |
} |