The docs for syslink (2.10.06.28) ProcMgr_attach() state " If the user does not wish to make any change in the default parameters, the application can simply call ProcMgr_attach() with NULL parameters. The default parameters would get automatically used, " however on linux, I get ProcMgr_E_OSFAILURE. Using default parameters created with ProcMgr_getAttachParams does work.