: Check the VxWorks shell command show to list environment variables. If LD_PATH appears, it is likely custom application-specific, not a system loader variable. For dynamic module loading, refer to your VxWorks documentation for loadModule() , unldLib , and module search path configuration.
If you have two versions of a module (e.g., a debug version and a release version) with the same name in different directories, the loader will load the one found in the directory listed first in LD_PATH . Always order your paths from most specific to least specific. vxworks ld_path environment variable
: If your application uses third-party libraries (like RTI Connext DDS ), those paths must be added to LD_LIBRARY_PATH alongside the path to the VxWorks libc.so . Summary Review Table Description Standard Variable LD_LIBRARY_PATH Application Type User-space Real-Time Processes (RTP) Common Path Often points to /romfs/lib or external storage like /sd0 Separators Semicolon ( ; ) or comma ( , ) in many VxWorks versions LD_LIBRARY_PATH – or: How to get yourself into trouble! : Check the VxWorks shell command show to
The LD_PATH environment variable is in VxWorks. You might be confusing it with other operating systems (like Linux, where LD_LIBRARY_PATH affects the dynamic linker). If you have two versions of a module (e
In Wind River’s VxWorks real-time operating system (RTOS), managing how executables resolve dependencies requires precise use of environment variables. The environment variable (often referenced alongside legacy or custom platform variants like LD_PATH ) is the foundational mechanism used by the VxWorks runtime linker to locate and bind shared libraries ( .so files) within Real-Time Processes (RTPs). Architectural Context: Memory Models & RTPs VxWorks architecture is split into two runtime models:
Downloadable Kernel Modules share a flat, single address space with the kernel. They resolve symbols directly via the kernel system symbol table upon loading, completely bypassing environment variables.
For developers building complex applications on VxWorks, mastering LD_PATH is not just a convenience—it is a necessity for robust system architecture.
