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elf_rand(ELF)


elf_rand -- random archive member access

Synopsis

   cc [flag . . . ] file . . . -lelf [library] . . .
   

#include <libelf.h>

size_t elf_rand(Elf *elf, size_t offset);

Description

elf_rand, elf_next, and elf_begin manipulate simple object files and archives. elf is an ELF descriptor previously returned from elf_begin.

elf_rand provides random archive processing, preparing elf to access an arbitrary archive member. elf must be a descriptor for the archive itself, not a member within the archive. offset gives the byte offset from the beginning of the archive to the archive header of the desired member. See elf_getarsym(ELF) for more information about archive member offsets. When elf_rand works, it returns offset. Otherwise it returns 0, because an error occurred, elf was null, or the file was not an archive (no archive member can have a zero offset). A program may mix random and sequential archive processing.

Examples

An archive starts with a ``magic string'' that has SARMAG bytes; the initial archive member follows immediately. An application could thus provide the following function to rewind an archive (the function returns -1 for errors and 0 otherwise).

#include <ar.h> #include <libelf.h>

int rewindelf(Elf *elf) { if (elf_rand(elf, (size_t)SARMAG) == SARMAG) return 0; return -1; }

References

ar(F), Intro(ELF), elf_begin(ELF), elf_getarsym(ELF), elf_next(ELF)
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