Shared Library Management Routines

The shl_load Shared Library Management Routines

Description

To obtain information on currently loaded libraries, use the shl_get function. If you are programming in a threaded environment, use the thread-safe version shl_get_r which is the same as shl_get in all other respects. (See Programming with Threads on HP-UXfor more information about threads.)

Other than obtaining interesting information, this routine is of little use to most programmers. A typical use might be to display the names and starting/ending address of all shared libraries in a process's virtual memory address space.

Example

The function show_loaded_libs shown below displays the name and start and end address of the text and data/bss segments the library occupies in a process's virtual address space.

show_loaded_libs — Display Library Information

#include

<stdio.h>

/* contains standard I/O defs

*/

#include

<dl.h>

/* contains shared library type defs

*/

void

show_loaded_libs(void)

 

 

{

 

 

 

int

idx;

 

 

struct

shl_descriptor *desc;

 

 

printf(“SUMMARY of currently loaded libraries:\n”); printf(“%-25s %10s %10s %10s %10s\n”,

“___library___”, “_tstart_”, “__tend__”, “_dstart_”, “__dend__”);

idx = 0;

for (idx = 0; shl_get(idx, &desc) != -1; idx++) printf(“%-25s %#10lx %#10lx %#10lx %#10lx\n”,

desc->filename, desc->tstart, desc->tend, desc->dstart, desc->dend);

}

Calling this function from a C program compiled with shared libc and libdld produced the following output:

SUMMARY

of currently loaded libraries:

 

 

___library___

_tstart_

__tend__

_dstart_

__dend__

./a.out

 

0x1000

0x1918

0x40000000

0x40000200

/usr/lib/libdld.sl

0x800ac800

0x800ad000

0x6df62800

0x6df63000

/usr/lib/libc.sl

0x80003800

0x80091000

0x6df63000

0x6df85000

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Kenwood HP 9000 manual Example, Showloadedlibs Display Library Information

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