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Full Discussion: dlopen failed!
Top Forums Programming dlopen failed! Post 87724 by virmin on Thursday 27th of October 2005 05:53:28 AM
Old 10-27-2005
dlopen failed!
I can open my so file successfully by calling dlopen directly in my main function. But if I fork a child process, and call dlopen in child process, it failed!
I don't know why. Following is my code:
#include <stdio.h>
#include <errno.h>
#include <dlfcn.h>
void childFunc(void)
{
void *handle;

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

void main(void)
{
int ret;
/* childFunc(); call directly, dlopen will success.*/

ret = fork();
if( ret == 0 )
{
childFunc(); /* dlopen will fail */
return;
}
else if( ret == -1 )
{
perror("fork");
retrun;
}
else
{
waitpid(ret);
}
}

Can anyone tell me why this happened? Is that a bug of Aix5.2 or there is anything wrong with my so file??The errmsg is "Bad address", the errno is 14.
 

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LEARN ABOUT X11R4

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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