| 1 | /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, write to the Free |
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| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 17 | 02111-1307 USA. */ |
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| 18 | |
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| 19 | #ifndef _SYS_UIO_H |
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| 20 | # error "Never include <bits/uio.h> directly; use <sys/uio.h> instead." |
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| 21 | #endif |
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| 22 | |
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| 23 | |
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| 24 | #include <sys/types.h> |
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| 25 | |
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| 26 | |
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| 27 | /* We should normally use the Linux kernel header file to define this |
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| 28 | type and macros but this calls for trouble because of the header |
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| 29 | includes other kernel headers. */ |
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| 30 | |
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| 31 | /* Size of object which can be written atomically. |
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| 32 | |
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| 33 | This macro has different values in different kernel versions. The |
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| 34 | latest versions of ther kernel use 1024 and this is good choice. Since |
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| 35 | the C library implementation of readv/writev is able to emulate the |
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| 36 | functionality even if the currently running kernel does not support |
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| 37 | this large value the readv/writev call will not fail because of this. */ |
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| 38 | #define UIO_MAXIOV 1024 |
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| 39 | |
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| 40 | |
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| 41 | /* Structure for scatter/gather I/O. */ |
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| 42 | struct iovec |
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| 43 | { |
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| 44 | void *iov_base; /* Pointer to data. */ |
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| 45 | size_t iov_len; /* Length of data. */ |
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| 46 | }; |
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