elf_cntl
— control
an elf file descriptor
ELF Access Library (libelf, -lelf)
#include
<libelf.h>
int
elf_cntl
(Elf
*elf, Elf_Cmd
cmd);
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).
Due to use of
mmap(2)
internally, this function is a no-op for ELF objects opened in
ELF_C_READ
mode.
Function elf_cntl
() returns 0 on success,
or -1 if an error was detected.