The
dl_iterate_phdr()
function iterates over all ELF objects loaded into a process's
address space, calling
callback
for each object, passing it information about the object's
program headers and the
data
argument.
The iteration is aborted when all objects are passed, or when the next
callback
call returns non-zero value.
The information about the program headers is passed in a structure
that is defined as:
struct dl_phdr_info {
Elf_Addr dlpi_addr;
const char *dlpi_name;
const Elf_Phdr *dlpi_phdr;
Elf_Half dlpi_phnum;
unsigned long long int dlpi_adds;
unsigned long long int dlpi_subs;
size_t dlpi_tls_modid;
void *dlpi_tls_data;
};
The members of
struct dl_phdr_info
have the following meaning:
|
| dlpi_addr
|
| |
The base address at which the object is mapped into the address
space of the calling process.
|
| dlpi_name
|
| |
The pathname of the ELF object.
|
| dlpi_phdr
|
| |
A pointer to the object's program headers.
|
| dlpi_phnum
|
| |
The number of program headers in the object.
|
| dlpi_adds
|
| |
The counter of the object loads performed by the dynamic linker.
|
| dlpi_subs
|
| |
The counter of the object unloads performed by the dynamic linker.
|
| dlpi_tls_modid
|
| |
The TLS index of the object.
|
| dlpi_tls_data
|
| |
A pointer to the initialization data for the object TLS segment.
|
|
Future versions of
FreeBSD
might add more members to this structure.
To make it possible for programs to check whether any new members have
been added, the size of the structure is passed as an second argument to
callback.
The third argument to callback is the
data
value passed to the call to
dl_iterate_phdr(),
allowing the
callback
to have a context.
