HP UX Software Transition Kit (STK) manual Dlsetlibpath Routine, Synopsis

{
void* handle;	handle = dlopen("./lib1.so", RTLD_GLOBAL RTLD_LAZY);

if (handle == NULL) { printf("Cannot load library\n");

}

}

The following example illustrates the use of dlopene to load a shared library with an explicit data segment address. For simplicity, error checking has been omitted:

#include <dlfcn.h> #include <sys/mman.h>

int main() {

struct dlfileinfo info; void *handle;

struct dlopen_opts opts; int status;

memset(&info, 0, sizeof(info)); memset(&opts, 0, sizeof(opts));

/* Get file info */

status = dlgetfileinfo("libfoo.so", sizeof(info), &info); opts.flags = RTLD_EXT_DATA_ADDR;

/* allocate memory for the data segment */ opts.data_addr = (char*) mmap(0, info.data_size,

PROT_READPROT_WRITE, MAP_SHAREDMAP_ANONYMOUS, -1, 0);

/* call dlopene */

handle = dlopene("libfoo.so", RTLD_NOWRTLD_GLOBAL, &opts); /* Insert user code to use library */

/* close library */ status = dlclose(handle); /* free memory */ munmap(opts.data_addr, info.data_size);

}

The dlsetlibpath Routine

The dlsetlibpath routine sets the dynamic search path to locate shared libraries.

Synopsis

cc[flag ... ] file ... -ldl [library] ...

#include <dlfcn.h>

int dlsetlibpath(const char *libpath, int flags)

Description

The dlsetlibpath routine is one of a family of routines that give the user direct access to the dynamic linking facilities (using the -ldloption on the compiler of ld command line). The dlsetlibpath routine sets the dynamic search path used by dlopen, dlopene, and dlgetfileinfo to locate shared libraries.

The libpath is the dynamic search path. It is a list of one or more path names separated by colons (:).

When searching for a library, the dynamic loader uses search paths in the following default order:

1.The dynamic search path specified in a call to dlsetlibpath.

2.The LD_LIBRARY_PATH environment variable.

3.The SHLIB_PATH environment variable.

The dlopen Shared Library Management Routines 153