47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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/****************************************************************
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* *
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* Copyright 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#define STRUCT_STAT_HAS_ST_GEN defined(__osf__) || defined(_AIX)
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#include "mdef.h"
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#include "gtm_ipc.h"
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#include "mmrhash.h"
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#include <sys/types.h>
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#include <gtm_stat.h>
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#include <eintr_wrappers.h>
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key_t
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gtm_ftok(const char *path, int id)
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{
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int rc;
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struct stat statbuf;
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uint32_t key = 0;
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STAT_FILE(path, &statbuf, rc);
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if (rc < 0)
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{
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return (key_t)-1;
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}
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MurmurHash3_x86_32(&statbuf.st_dev, sizeof statbuf.st_dev, key, &key);
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MurmurHash3_x86_32(&statbuf.st_ino, sizeof statbuf.st_ino, key, &key);
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#if STRUCT_STAT_HAS_ST_GEN
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MurmurHash3_x86_32(&statbuf.st_gen, sizeof statbuf.st_gen, key, &key);
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#endif
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/* substitute the id for the top 8 bits of the hash */
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key &= 0x00ffffff;
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key |= (id & 0xff) << 24;
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return (key_t)key;
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}
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