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Here is an overview of the contents of the remaining chapters of
section Error Reporting, describes how errors detected by the library
section C Language Facilities in the Library, contains information about library support for
standard parts of the C language, including things like the
operator and the symbolic constant
NULL, how to write functions
accepting variable numbers of arguments, and constants describing the
ranges and other properties of the numerical types. There is also a simple
debugging mechanism which allows you to put assertions in your code, and
have diagnostic messages printed if the tests fail.
section Memory Allocation, describes the GNU library's facilities for
dynamic allocation of storage. If you do not know in advance how much
storage your program needs, you can allocate it dynamically instead,
and manipulate it via pointers.
section Character Handling, contains information about character
classification functions (such as
isspace) and functions for
performing case conversion.
section String and Array Utilities, has descriptions of functions for
manipulating strings (null-terminated character arrays) and general
byte arrays, including operations such as copying and comparison.
section Input/Output Overview, gives an overall look at the input and output
facilities in the library, and contains information about basic concepts
such as file names.
section Input/Output on Streams, describes I/O operations involving streams (or
FILE * objects). These are the normal C library functions
section Low-Level Input/Output, contains information about I/O operations
on file descriptors. File descriptors are a lower-level mechanism
specific to the Unix family of operating systems.
section File System Interface, has descriptions of operations on entire
files, such as functions for deleting and renaming them and for creating
new directories. This chapter also contains information about how you
can access the attributes of a file, such as its owner and file protection
section Pipes and FIFOs, contains information about simple interprocess
communication mechanisms. Pipes allow communication between two related
processes (such as between a parent and child), while FIFOs allow
communication between processes sharing a common file system on the same
section Sockets, describes a more complicated interprocess communication
mechanism that allows processes running on different machines to
communicate over a network. This chapter also contains information about
Internet host addressing and how to use the system network databases.
section Low-Level Terminal Interface, describes how you can change the
attributes of a terminal device. If you want to disable echo of
characters typed by the user, for example, read this chapter.
section Mathematics, contains information about the math library
functions. These include things like random-number generators and
remainder functions on integers as well as the usual trigonometric and
exponential functions on floating-point numbers.
section Low-Level Arithmetic Functions, describes functions
for simple arithmetic, analysis of floating-point values, and reading
numbers from strings.
section Searching and Sorting, contains information about functions
for searching and sorting arrays. You can use these functions on any
kind of array by providing an appropriate comparison function.
section Pattern Matching, presents functions for matching regular expressions
and shell file name patterns, and for expanding words as the shell does.
section Date and Time, describes functions for measuring both calendar time
and CPU time, as well as functions for setting alarms and timers.
section Extended Characters, contains information about manipulating
characters and strings using character sets larger than will fit in
char data type.
section Locales and Internationalization, describes how selecting a particular country
or language affects the behavior of the library. For example, the locale
affects collation sequences for strings and how monetary values are
section Non-Local Exits, contains descriptions of the
longjmp functions. These functions provide a facility for
goto-like jumps which can jump from one function to another.
section Signal Handling, tells you all about signals--what they are,
how to establish a handler that is called when a particular kind of
signal is delivered, and how to prevent signals from arriving during
critical sections of your program.
section Process Startup and Termination, tells how your programs can access their
command-line arguments and environment variables.
section Processes, contains information about how to start new processes
and run programs.
section Job Control, describes functions for manipulating process groups
and the controlling terminal. This material is probably only of
interest if you are writing a shell or other program which handles job
section System Databases and Name Service Switch, describes the services which are available
for looking up names in the system databases, how to determine which
service is used for which database, and how these services are
implemented so that contributors can design their own services.
section User Database, and section Group Database, tell you how to access
the system user and group databases.
section System Information, describes functions for getting information
about the hardware and software configuration your program is executing
section System Configuration Parameters, tells you how you can get information about
various operating system limits. Most of these parameters are provided for
compatibility with POSIX.
section Summary of Library Facilities, gives a summary of all the functions, variables, and
macros in the library, with complete data types and function prototypes,
and says what standard or system each is derived from.
section Library Maintenance, explains how to build and install the GNU C library on
your system, how to report any bugs you might find, and how to add new
functions or port the library to a new system.
If you already know the name of the facility you are interested in, you
can look it up in section Summary of Library Facilities. This gives you a summary of
its syntax and a pointer to where you can find a more detailed
description. This appendix is particularly useful if you just want to
verify the order and type of arguments to a function, for example. It
also tells you what standard or system each function, variable, or macro
is derived from.
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