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HP-UX Reference > Eelf_hash(3E)HP-UX 11i Version 2: December 2007 Update |
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NAMEelf_hash — compute hash value SYNOPSIScc [flag... ] file... -lelf [library] ... #include <libelf.h> unsigned long elf_hash(const char *name); DESCRIPTIONelf_hash computes a hash value, given a null terminated string, name. The returned hash value, h, can be used as a bucket index, typically after computing h mod x to ensure appropriate bounds. Hash tables may be built on one machine and used on another because elf_hash uses unsigned arithmetic to avoid possible differences in various machines' signed arithmetic. Although name is shown as char* above, elf_hash treats it as unsigned char* to avoid sign extension differences. Using char* eliminates type conflicts with expressions such as elf_hash ("name"). ELF files' symbol hash tables are computed using this function (see elf_getdata(3E) and elf_xlate(3E)). The hash value returned is guaranteed not to be the bit pattern of all ones (~0UL). |
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