HP-UX Reference (11i v1 05/09) - 3 Library Functions A-M (vol 6)

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dlopen(3C) dlopen(3C)

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_READ|PROT_WRITE,

MAP_SHARED|MAP_ANONYMOUS,

-1, 0);

/* call dlopene */

handle = dlopene("libfoo.so", RTLD_NOW|RTLD_GLOBAL, &opts);

/* Insert user code to use library */

/* close library */

status = dlclose(handle);

/* free memory */

munmap(opts.data_addr, info.data_size);

}

WARNINGS

In 64-bit mode, the environment variable LD_LIBRARY_PATH

and SHLIB_PATH should contain a

colon-separated list of directories, in the same format as the

PATH variable (see sh(1)).

LD_LIBRARY_PATH and

SHLIB_PATH are ignored if the process’ real user id is different from its

effective user id or its real group id is different from its effective group id (see exec(2)).

In 64-bit mode, with the

+compat option speciﬁed, LD_LIBRARY_PATH

and +b embedded path are

ignored while searching for dependent libraries.

Use caution when building shared libraries with external library dependencies. Any library that contains

Thread Local Storage (TLS) should not be used as a dependency. If a dependent library contains TLS, and

it is not loaded during program startup (that is, not linked against the executable), the dynamic loader fails

to perform the operation.