| 1 | .\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved. |
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| 2 | .\" |
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| 3 | .\" Redistribution and use in source and binary forms, with or without |
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| 4 | .\" modification, are permitted provided that the following conditions |
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| 5 | .\" are met: |
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| 6 | .\" 1. Redistributions of source code must retain the above copyright |
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| 7 | .\" notice, this list of conditions and the following disclaimer. |
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| 8 | .\" 2. Redistributions in binary form must reproduce the above copyright |
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| 9 | .\" notice, this list of conditions and the following disclaimer in the |
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| 10 | .\" documentation and/or other materials provided with the distribution. |
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| 11 | .\" |
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| 12 | .\" This software is provided by Joseph Koshy ``as is'' and |
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| 13 | .\" any express or implied warranties, including, but not limited to, the |
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| 14 | .\" implied warranties of merchantability and fitness for a particular purpose |
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| 15 | .\" are disclaimed. in no event shall Joseph Koshy be liable |
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| 16 | .\" for any direct, indirect, incidental, special, exemplary, or consequential |
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| 17 | .\" damages (including, but not limited to, procurement of substitute goods |
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| 18 | .\" or services; loss of use, data, or profits; or business interruption) |
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| 19 | .\" however caused and on any theory of liability, whether in contract, strict |
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| 20 | .\" liability, or tort (including negligence or otherwise) arising in any way |
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| 21 | .\" out of the use of this software, even if advised of the possibility of |
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| 22 | .\" such damage. |
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| 23 | .\" |
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| 24 | .\" $Id: elf_hash.3 189 2008-07-20 10:38:08Z jkoshy $ |
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| 25 | .\" |
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| 26 | .Dd August 15, 2006 |
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| 27 | .Os |
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| 28 | .Dt ELF_HASH 3 |
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| 29 | .Sh NAME |
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| 30 | .Nm elf_hash |
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| 31 | .Nd compute a hash value for a string |
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| 32 | .Sh LIBRARY |
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| 33 | .Lb libelf |
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| 34 | .Sh SYNOPSIS |
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| 35 | .In libelf.h |
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| 36 | .Ft "unsigned long" |
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| 37 | .Fn elf_hash "const char *name" |
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| 38 | .Sh DESCRIPTION |
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| 39 | Function |
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| 40 | .Fn elf_hash |
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| 41 | computes a portable hash value for the null terminated string |
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| 42 | pointed to by argument |
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| 43 | .Ar name . |
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| 44 | .Pp |
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| 45 | The hash value returned is will be identical across |
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| 46 | machines of different architectures. |
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| 47 | This allows hash tables to be built on one machine and |
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| 48 | correctly used on another of a different architecture. |
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| 49 | The hash value returned is also guaranteed |
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| 50 | .Em not |
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| 51 | to be the bit pattern of all ones (~0UL). |
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| 52 | .Sh IMPLEMENTATION NOTES |
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| 53 | The library internally uses unsigned 32 bit arithmetic to compute |
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| 54 | the hash value. |
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| 55 | .Sh SEE ALSO |
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| 56 | .Xr elf 3 , |
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| 57 | .Xr gelf 3 |
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