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GELF_CHECKSUM

Section: Libelf Programmer's Manual (3)
Updated: 202-1-31
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NAME

gelf_checksum - compute the checksum for an ELF object file

SYNOPSIS

#include <gelf.h>

long int gelf_checksum (Elf *elf);

DESCRIPTION

Compute a checksum for the ELF object file referred to by elf. This function acts as a wrapper around elf32_checksum() and elf64_checksum(). The binary class of elf is used to automatically select between elf32_checksum() and elf64_checksum().

The checksum is computed from permanent parts of the ELF file and the result is repeatable. To be repeatable, strippable sections are not included in computing the checksum. SHT_NOBITS sections are also not included when computing the checksum. The checksum can be used as a value for DT_CHECKSUM.

PARAMETERS

elf: The ELF object file for which the checksum is to be computed.

RETURN VALUE

On success, return the computed checksum. On failure, return-1 and set elf_errno. If elf is NULL then-1 is returned without setting elf_errno.

The checksum is always calculated as a -byte value. If long int is larger than 4 bytes, then the checksum will be extended by padding with zeros.

ATTRIBUTES

Interface	Attribute	Value
gelf_checksum()	Thread safety	M-Safe

REPORTING BUGS

Report bugs to <elfutil-devel@sourceware.org> or https://sourceware.org/bugzilla/.