HP UX Software Transition Kit (STK) Dynamic Path Searching for Shared Libraries, Symbol names

Table 19 Symbol names

Symbol	Definition
__SYSTEM_ID	Largest architecture revision level used by any compilation unit
_FPU_STATUS	Initial value of FPU status register.
_end	Address of first byte following the end of the main program's data segment; identifies the beginning
	of the heap segment.
__TLS_SIZE	Size of the Thread Local Storage segment required by the program. This symbol is not reserved
	in PA32 (SOM).
__text_start	Beginning of the text segment.
_etext	End of the text segment.
__data_start	Beginning of the data segment.
_edata	End of initialized data.
__gp	Global pointer value. This symbol is not reserved in PA32 (SOM).
__init_start	Beginning of the .init section.
__init_end	End of the .init section.
__fini_start	Beginning of the .fini section.
__fini_end	End of the .fini section.
__unwind_start	Beginning of the unwind table. This symbol is not reserved in PA32 (SOM).
__unwind_end	End of the unwind table. This symbol is not reserved in PA32 (SOM).

Dynamic Path Searching for Shared Libraries

Dynamic path searching is the process that enables you to specify the location of shared libraries at run time. In PA-32 mode, you can enable run-time dynamic path searching of shared libraries in the following ways:

•By linking the program with +s, enabling the program to use the path list defined by the SHLIB_PATH environment variable at run time.

•By storing a directory path list in the program with the linker option +b path_list.

If +s or +b path_list is enabled, all shared libraries specified with the -llibrary or -l:librarylinker options are subject to a dynamic path lookup at run time.

In IPF, the dynamic path searching behavior has changed (same as PA-64 mode):

•The +s dynamic path searching option is enabled by default. It is not enabled by default in PA-32 mode.

•The LD_LIBRARY_PATH environment variable is available in addition to the SHLIB_PATH environment variable.

•An embedded run-time path list called RUNPATH may be stored in the executable. If +b path_list is specified at link time, these directories are added to RUNPATH. If +b path_list is not specified, the linker creates a default RUNPATH consisting of:

1.directories in the -Loption (if specified), followed by

2.directories in the LPATH environment variable (if specified).

•By default, the linker ignores the ordering of the +b path_list and +s options.

•At run time, the dynamic loader searches directory paths in the following order:

1.dynamic path (if set using dlsetlibpath())

2.LD_LIBRARY_PATH (if set)

Dynamic Path Searching for Shared Libraries 83