01-07-2010
Dynamic Downloading and executing of ELF files
Dear Group,
I want to prepare an ELF file which can be downloaded dynamically to any address in the moemory and executes as a new task/thread/process.
1) for this what are all the compileation, linker options while building the ELF file?
2) which parts of ELF file has to modified while loading?(what setions or offset)
3) please suggest me how the Dynamic download loader should be to achieve this.
Thanks,
Ravinder
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LEARN ABOUT NETBSD
elf_cntl
ELF_CNTL(3) BSD Library Functions Manual ELF_CNTL(3)
NAME
elf_cntl -- control an elf file descriptor
LIBRARY
ELF Access Library (libelf, -lelf)
SYNOPSIS
#include <libelf.h>
int
elf_cntl(Elf *elf, Elf_Cmd cmd);
DESCRIPTION
Function elf_cntl() controls the ELF library's subsequent use of the file descriptor used to create ELF descriptor elf.
Argument cmd informs the library of the action to be taken:
ELF_C_FDDONE This value instructs the ELF library not to perform any further I/O on the file descriptor associated with argument elf. For
ELF descriptors opened with mode ELF_C_WRITE or ELF_C_RDWR subsequent elf_update() operations on the descriptor will fail.
ELF_C_FDREAD This value instructs the ELF library to read in all necessary data associated with ELF descriptor elf into memory so that the
underlying file descriptor can be safely closed with command ELF_C_FDDONE.
Argument elf must be an ELF descriptor associated with a file system object (e.g., an ar(1) archive, an ELF file, or other data file).
IMPLEMENTATION NOTES
Due to use of mmap(2) internally, this function is a no-op for for ELF objects opened in ELF_C_READ mode.
RETURN VALUES
Function elf_cntl() returns 0 on success, or -1 if an error was detected.
ERRORS
[ELF_E_ARCHIVE] Argument elf is a descriptor for an archive member.
[ELF_E_ARGUMENT] Argument elf was NULL.
[ELF_E_ARGUMENT] Argument cmd was not recognized.
[ELF_E_MODE] An ELF_C_FDREAD operation was requested on an ELF descriptor opened for writing.
SEE ALSO
elf(3), elf_begin(3), elf_end(3), elf_next(3), elf_update(3), gelf(3)
BSD
August 9, 2006 BSD