June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Looking at the components of the C library
The C library is not a single library file. It is composed of four main parts that together implement the POSIX API:
- libc: The main C library that contains the well-known POSIX functions such as printf, open, close, read, write, and so on
- libm: Contains maths functions such as cos, exp, and log
- libpthread: Contains all the POSIX thread functions with names beginning with pthread_
- librt: Has the real-time extensions to POSIX, including shared memory and asynchronous I/O
The first one, libc, is always linked in but the others have to be explicitly linked with the -l option. The parameter to -l is the library name with lib stripped off. For example, a program that calculates a sine function by calling ...
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