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Full Discussion: Specifying dynamic library path to linker at compile time
Top Forums Programming Specifying dynamic library path to linker at compile time Post 302882013 by waavman on Friday 3rd of January 2014 02:11:33 PM
Old 01-03-2014
Specifying dynamic library path to linker at compile time
I would like to compile a binary that doesnot depend on LD_LIBRARY_PATH as this binary will be setuid to owner and used by other users and since setuid doesnot support LD_LIBRARY_PATH making it independent of LD_LIBRARY_PATH would be great.

But I am not able to specify the path of the shared libraries to the linker at compile time. I am using gcc compiler 4.1.2 and on Linux OS Red Hat 5.8. I am using the following compile command where /aaa/bbb/lib is the path of the shared library that is used by the binary waitdb.ORACLE called within the binary simple:

Code:
gcc simple.c -Wl,-rpath=/aaa/bbb/lib -o simple

simple.c has nothing but an execvp call to another binary 'waitdb.ORACLE' which uses libuidata.so that is located in /aaa/bbb/lib directory
Contents of simple.c are as follows:

Code:
#include <stdio.h>
int main(int argc, char* argv[])
{
        char* args[3];
        args[0]="/aaa/bbb/bin/waitdb.ORACLE";
        args[1]=NULL;
        printf ("before executing execvp\n");
        execvp (args[0],args);
        printf ("after executing execvp\n");
}

But when I run the executable 'simple' I get the following error

Code:
[acdev2@hostname tmp]$ ./simple
before executing execvp
/aaa/bbb/bin/waitdb.ORACLE: error while loading shared libraries: libuidata.so: cannot open shared object file: No such file or directory

On the other hand if I run at the commandline, the export LD_LIBRARY_PATH command before calling the binary it works FINE.

Code:
[acdev2@hostname tmp]$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/aaa/bbb/lib
[acdev2@hostname1 tmp]$ ./simple
before executing execvp
+++INFO+++ 20140103_13:54:32 @(#)waitdb[6.2/$Revision: 5538 $]: RDBMS DNYASC01 is accepting connections

Please advise how I can specify the /aaa/bbb/lib path to the linker at compile time of binary 'simple' so that when 'simple' binary tries to execvp another c binary 'waitdb.ORACLE' binary within it the linker knows where to find the libuidata.so shared library file that waitdb.ORACLE uses (without using the LD_LIBRARY_PATH variable) ?

thanks
Last edited by bartus11; 01-03-2014 at 03:32 PM.. Reason: Please use code tags
 

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LEARN ABOUT CENTOS

uselib

USELIB(2)						     Linux Programmer's Manual							 USELIB(2)

NAME

       uselib - load shared library

SYNOPSIS

       #include <unistd.h>

       int uselib(const char *library);

DESCRIPTION

       The  system call uselib() serves to load a shared library to be used by the calling process.  It is given a pathname.  The address where to
       load is found in the library itself.  The library can have any recognized binary format.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       In addition to all of the error codes returned by open(2) and mmap(2), the following may also be returned:

       EACCES The library specified by library does not have read or execute permission, or the caller does not have search permission for one	of
	      the directories in the path prefix.  (See also path_resolution(7).)

       ENFILE The system limit on the total number of open files has been reached.

       ENOEXEC
	      The file specified by library is not an executable of known type, e.g., does not have the correct magic numbers.

CONFORMING TO

       uselib() is Linux-specific, and should not be used in programs intended to be portable.

NOTES

       uselib() was used by early libc startup code to load the shared libraries with names found in an array of names in the binary.

       Since  libc 4.3.2, startup code tries to prefix these names with "/usr/lib", "/lib" and "" before giving up.  In libc 4.3.4 and later these
       names are looked for in the directories found in LD_LIBRARY_PATH, and if not found there, prefixes "/usr/lib", "/lib" and "/" are tried.

       From libc 4.4.4 on only the library "/lib/ld.so" is loaded, so that this dynamic library can load the  remaining  libraries  needed  (again
       using this call).  This is also the state of affairs in libc5.

       glibc2 does not use this call.

SEE ALSO

       ar(1), gcc(1), ld(1), ldd(1), mmap(2), open(2), dlopen(3), capabilities(7), ld.so(8)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2005-01-09								 USELIB(2)
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