dynamic loading | An SVR4 term for a shared library. |
library |
|
dynamic search | The process that allows the location of shared libraries to be specified at runtime. |
path |
|
entry point | The location at which a program starts running after |
| is defined by the symbol $START$ in crt0.o. |
explicit loading | The process of using the shl_load(3X) function to load a shared library into a running program. |
export stub | A short code segment generated by the linker for a global definition in a shared library. External |
| calls to shared library procedures go through the export stub. See also import stub. |
export symbol | A symbol definition that may be referenced outside the library. |
exporting a | Making a symbol visible to code outside the module in which the symbol was defined. This is |
symbol | usually done with the +e or |
external reference | A reference to a symbol defined outside an object file. |
An optimization technique wherein procedures are relocated in a program, based on profiling | |
positioning | data obtained from running the program. |
| performed during |
file descriptor | A file descriptor is returned by the open(2), creat(2), and dup(2) system calls. The file descriptor |
| is used by other system calls (for example, read(2), write(2), and close(2)) to refer to a the file. |
filters | Programs that accept input data and modify it in some way before passing it on. For example, |
| the pr command is a filter. |
flush | The process of emptying a buffer's contents and resetting its internal data structures. |
global definition | A definition of a procedure, function, or data item that can be accessed by code in another object |
| file. |
header string | A string, !<arch>\n, which identifies a file as an archive created by ar (\n represents the newline |
| character). |
hiding a symbol | Making a symbol invisible to code outside the module in which the symbol was defined. |
| Accomplished with the |
Intermediate | |
| optimization. |
immediate binding | By default, the dynamic loader attempts to bind all symbols in a shared library when a program |
| starts up - known as immediate binding. Compare with deferred binding. |
implicit address | Writing code that relies on the linker to locate a symbol in a particular location or in a particular |
dependency | order in relation to other symbols. |
implicit loading | Occurs when the dynamic loader automatically loads any required libraries when a program |
| starts execution. Compare with explicit loading. |
import stub | A short code segment generated by the linker for external references to shared library routines. |
| See also export stub. |
import symbol | An external reference made from a library. |
incomplete | An executable (a.out) file that uses shared libraries. It is incomplete because it does not actually |
executable | contain the shared library code that it uses; instead, the shared library code is attached when |
| the program runs. Compare with complete executable. |
indirect addressing | The process of accessing a memory location through a memory address that is stored in memory |
| or a register. |
initializer | An initialization routine that is called when a shared library is loaded or unloaded. |
intermediate code | A representation of object code that is at a lower level than the source code, but at a higher level |
| than the object code. |
library | A file containing object code for subroutines and data that can be used by programs. |
link order | The order in which object files and libraries are specified on the linker command line. |
The compilation phase in which the compiler calls the linker to create an executable (a.out) file | |
| from object modules and libraries. |
226 Glossary