NAME
dlget() — retrieve information about a loaded module (program or shared library)
SYNOPSIS
cc
[flag]...
file...
-ldl
[library]...
#include <dlfcn.h>
void *dlget(int index,
struct load_module_desc *desc,
size_t desc_size);
Multithread Usage
This routine is thread-safe.
DESCRIPTION
dlget()
is one of a family of routines that give the user
direct access to the dynamic linking facilities.
dlget()
returns information about a loaded module for a process.
retrieves information about a load module from an
index
specifying the placement of the load module in the dynamic
loader's search list. An
index
of
-1
requests information about the dynamic loader. An
index
of
-2
requests information about the program file itself.
If successful,
dlget()
returns a handle for the shared library as defined by the return value from
dlopen().
desc
must be preallocated by the user. The structure members are filled in by
the dynamic loader with information about the requested shared library.
A
load_module_desc
structure has the following members:
struct load_module_desc {
unsigned long text_base;
unsigned long text_size;
unsigned long data_base;
unsigned long data_size;
unsigned long unwind_base;
unsigned long linkage_ptr;
unsigned long phdr_base;
unsigned long tls_size;
unsigned long tls_start_addr;
}
desc_size
specifies the size in bytes of the
load_module_desc
structure sent in by the user.
If a call to
dlget()
is unsuccessful, a NULL
pointer is returned and
desc
remains unchanged.
ERRORS
If
dlget()
fails, a subsequent call to
dlerrno()
returns one of the following values:
- RTLD_ERR_CANT_APPLY_RELOC
Cannot apply relocation in library.
- RTLD_ERR_INV_BUFFER_ARGUMENT
Invalid descriptor argument.
- RTLD_ERR_INV_DESC_VERSION
Invalid descriptor version.
- RTLD_ERR_INV_LIB_INDEX
Invalid load module index.
- RTLD_ERR_NO_MEMORY
Out of memory.
- RTLD_ERR_SETCANCELSTATE_FAILED
__thread_setcancelstate
failed on entry to or exit from
dlget().
- RTLD_ERR_SIGENABLE_FAILED
sigenable
failed on exit from
dlget().
- RTLD_ERR_SIGINHIBIT_FAILED
siginhibit
failed on entry to
dlget().
AUTHOR
dlget()
was developed by HP.
SEE ALSO
Miscellaneous
- a.out(4)
Assembler, compiler, and linker output.
- dlclose(3C)
Unloads a shared library previously loaded by
dlopen().
- dlerror(3C)
Prints the last error message recorded by
dld.
- dlerrno(3C)
Returns an error code for the last error recorded by
dld.
- dlgetname(3C)
Returns the name of the storage containing a load module.
- dlmodinfo(3C)
Returns information about a loaded module.
- dlopen(3C)
Loads a shared library.
- dlsym(3C)
Gets the address of a symbol in a shared library.
Texts and Tutorials
- HP-UX Linker and Libraries Online User Guide
(See the
+help
option)
- HP-UX Linker and Libraries User's Guide
(See
manuals(5)
for ordering information)
Printable version
