GELF_UPDATE_AUXV(3) Libelf Programmer's Manual GELF_UPDATE_AUXV(3) NAME gelf_update_auxv - Update information in the auxiliary vector at the given index SYNOPSIS #include int gelf_update_auxv (Elf_Data *data, int ndx, GElf_auxv_t *src); DESCRIPTION Copy a class-independent auxiliary vector entry from src into the NT_AUXV note associated with data at index ndx. See getauxval(3) for more information regarding the auxiliary vector. PARAMETERS data Pointer to an Elf_Data associated with an NT_AUXV ELF note. data->d_type should be ELF_T_AUXV. NT_AUXV notes are normally found in core files. The auxiliary vector can also be read directly from /proc/PID/auxv of a live process, in which case this function does not write back to data itself. ndx Zero-based index of the auxiliary vector entry to be updated within data. src Pointer to a caller-provided auxiliary vector entry. For ELFCLASS32 binaries, a_type and a_val must fit within unsigned 32-bit values. src must not be NULL. RETURN VALUE On success, this function returns a non-zero value, updates the auxiliary vector entry at index ndx in data, and marks the section or segment associated with data with ELF_F_DIRTY. On failure, zero is returned and elf_errno is set. If data is NULL, then zero is returned without setting elf_errno. SEE ALSO gelf_getauxv(3), getauxval(3), libelf(3), elf(5) ATTRIBUTES +--------------------------------------------+---------------+---------+ |Interface | Attribute | Value | +--------------------------------------------+---------------+---------+ |gelf_update_auxv () | Thread safety | MT-Safe | +--------------------------------------------+---------------+---------+ REPORTING BUGS Report bugs to or https://sourceware.org/bugzilla/. HISTORY Libelf 2025-12-31 GELF_UPDATE_AUXV(3)