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$FreeBSD$
.Dd August 29, 2006 .Dt GELF_CHECKSUM 3 .Os .Sh NAME .Nm elf32_checksum , .Nm elf64_checksum , .Nm gelf_checksum .Nd return the checksum of an ELF object .Sh LIBRARY .Lb libelf .Sh SYNOPSIS n libelf.h .Ft long .Fn elf32_checksum "Elf *elf" .Ft long .Fn elf64_checksum "Elf *elf" n gelf.h .Ft long .Fn gelf_checksum "Elf *elf" .Sh DESCRIPTION These functions return a simple checksum of the ELF object described by their argument .Ar elf . The checksum is computed in way that allows its value to remain unchanged in presence of modifications to the ELF object by utilities like .Xr strip 1 .
p Function .Fn elf32_checksum returns a checksum for an ELF descriptor .Ar elf of class .Dv ELFCLASS32 .
p Function .Fn elf64_checksum returns a checksum for an ELF descriptor .Ar elf of class .Dv ELFCLASS64 .
p Function .Fn gelf_checksum provides a class-independent way retrieving the checksum for ELF object .Ar elf . .Sh RETURN VALUES These functions return the checksum of the ELF object, or zero in case an error was encountered. .Sh ERRORS These functions may fail with the following errors: l -tag -width "[ELF_E_RESOURCE]" t Bq Er ELF_E_ARGUMENT Argument .Ar elf was NULL. t Bq Er ELF_E_ARGUMENT Argument .Ar elf was not a descriptor for an ELF file. t Bq Er ELF_E_ARGUMENT The ELF descriptor .Ar elf was not opened for reading or updating. t Bq Er ELF_E_CLASS For functions .Fn elf32_checksum and .Fn elf64_checksum , ELF descriptor .Ar elf did not match the class of the called function. t Bq Er ELF_E_HEADER The ELF object specified by argument .Ar elf had a malformed executable header. t Bq Er ELF_E_RESOURCE An out of memory condition was detected during processing. t Bq Er ELF_E_SECTION The ELF object specified by argument .Ar elf contained a section with a malformed section header. t Bq Er ELF_E_VERSION The ELF object was of an unsupported version. .El .Sh SEE ALSO .Xr strip 1 , .Xr elf 3 , .Xr gelf 3