compile error while using dlopen Post: 102135

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Top Forums Programming compile error while using dlopen Post 102135 by shriashishpatil on Thursday 16th of March 2006 12:22:54 AM

03-16-2006

Registered User

I have made few changes in test program. Added errorno and dlerror() just for error checking

Quote:

$
$ cat testjvm2.c
#include <stdio.h>
#include <errno.h>
#include <dlfcn.h>

void main(void)
{

void *handle;

handle = dlopen("libjvm.so", RTLD_LAZY);
if( handle == NULL )
{
printf("errno[%d], errmsg[%s]\n", errno, dlerror());
return;
}
else
{
printf("\nJVM loaded successfully");
}
dlclose(handle);

}
$

when I compile the program I get error

Quote:

$ cc -o testjvm2 testjvm2.c
Undefined first referenced
symbol in file
dlopen testjvm2.o (symbol belongs to implicit dependency /usr/lib/libdl.so.1)
dlclose testjvm2.o (symbol belongs to implicit dependency /usr/lib/libdl.so.1)
dlerror testjvm2.o (symbol belongs to implicit dependency /usr/lib/libdl.so.1)
ld: fatal: Symbol referencing errors. No output written to testjvm2
$

Quote:

$ uname -a
SunOS snvi003 5.8 Generic_117350-20 sun4u sparc SUNW,Sun-Fire-V240
$

any pointers why the linking error?

-Ashish

shriashishpatil

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LEARN ABOUT PLAN9

dlerror

DLERROR(3)						     Linux Programmer's Manual							DLERROR(3)

NAME

       dlerror - obtain error diagnostic for functions in the dlopen API

SYNOPSIS

       #include <dlfcn.h>

       char *dlerror(void);

       Link with -ldl.

DESCRIPTION

       The  dlerror()  function returns a human-readable, null-terminated string describing the most recent error that occurred from a call to one
       of the functions in the dlopen API since the last call to dlerror().  The returned string does not include a trailing newline.

       dlerror() returns NULL if no errors have occurred since initialization or since it was last called.

VERSIONS

       dlerror() is present in glibc 2.0 and later.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |dlerror() | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO

       POSIX.1-2001.

NOTES

       The message returned by dlerror() may reside in a statically allocated buffer that is overwritten by subsequent dlerror() calls.

   History
       This function is part of the dlopen API, derived from SunOS.

EXAMPLE

       See dlopen(3).

SEE ALSO

       dladdr(3), dlinfo(3), dlopen(3), dlsym(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15								DLERROR(3)

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dlerror