1/* 2 * Copyright 2019-2024 Haiku, Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Adrien Destugues, pulkomandy@pulkomandy.tk 7 */ 8 9/*! 10\page libroot C, POSIX, GNU and BSD functions 11 12Haiku implements a standard library containing the standard functions from C 13(https://www.iso.org/standard/29237.html) and POSIX 14(https://pubs.opengroup.org/onlinepubs/9699919799/). These functions are 15available in libroot, which is linked in by default. 16 17For convenience and POSIX compatibility, empty "m" and "pthread" libraries are 18also provided, but the math and thread functions are also defined in libroot. However, this is 19currently not the case for "rt" and "trace" (both also part of the standard libraries required 20in POSIX). 21 22The C library also contains a number of GNU and BSD extensions to the C and 23POSIX standards. The BSD extensions are enabled by default unless a specific 24version of the C standard is requested from the compiler command line (for 25example by using the --std=c99 switch). In case you want to set the compiler 26to strict C99 but still use these extensions, you need to define _DEFAULT_SOURCE 27(with a \#define preprocessor directive, or from the command line). 28 29The GNU extensions are not enabled by default, but can be enabled by defining 30_GNU_SOURCE. 31 32The GNU and BSD extensions are in a separate library, so the -lbsd linker flag 33may be needed to use them. 34 35On the other hand, network socket functions (socket, connect, bind, accept, ...) are provided in 36a separate library, libnetwork.so. To use these functions you will need to use the -lnetwork 37linker command line switch (instead of the POSIX specified -lxnet). 38 39*/ 40