QNX Neutrino Programmer's Guide [6.5.0 SP1] - QNX Software ...

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Making your code more portable © 2012, QNX Software Systems Limited Conforming to standards The header files supplied with the C library provide the proper declarations for the functions and for the number and types of arguments used with them. Constant values used in conjunction with the functions are also declared. The files can usually be included in any order, although individual function descriptions show the preferred order for specific headers. When you use the -ansi option, qcc compiles strict ANSI code. Use this option when you’re creating an application that must conform to the ANSI standard. The effect on the inclusion of ANSI- and POSIX-defined header files is that certain portions of the header files are omitted: • for ANSI header files, these are the portions that go beyond the ANSI standard • for POSIX header files, these are the portions that go beyond the POSIX standard You can then use the qcc -D option to define feature-test macros to select those portions that are omitted. Here are the most commonly used feature-test macros: _POSIX_C_SOURCE=199506 Include those portions of the header files that relate to the POSIX standard (IEEE Standard Portable Operating System Interface for Computer Environments - POSIX 1003.1, 1996) _FILE_OFFSET_BITS=64 Make the libraries use 64-bit file offsets. _LARGEFILE64_SOURCE Include declarations for the functions that support large files (those whose names end with 64). _QNX_SOURCE Include everything defined in the header files. This is the default. Feature-test macros may be defined on the command line, or in the source file before any header files are included. The latter is illustrated in the following example, in which an ANSI- and POSIX-conforming application is being developed. #define _POSIX_C_SOURCE=199506 #include #include . #if defined(_QNX_SOURCE) #include "non_POSIX_header1.h" #include "non_POSIX_header2.h" #include "non_POSIX_header3.h" #endif You’d then compile the source code using the -ansi option. The following ANSI header files are affected by the _POSIX_C_SOURCE feature-test macro: 4 Chapter 1 • Compiling and Debugging June 14, 2012
© 2012, QNX Software Systems Limited Making your code more portable • • • • • • The following ANSI and POSIX header files are affected by the _QNX_SOURCE feature-test macro: Header file Type ANSI POSIX ANSI ANSI ANSI extension to POSIX ANSI ANSI POSIX ANSI ANSI ANSI POSIX ANSI POSIX POSIX You can also set the POSIXLY_CORRECT environment variable to 1. This environment variable is used by Unix-style operating systems to alter behavior to comply with POSIX where it’s different from the OS’s default behavior. For example, if POSIXLY_CORRECT is set, functions that check the length of a pathname do so before removing any redundant . and .. components. If POSIXLY_CORRECT isn’t set, the functions check the length after removing any redundant components. June 14, 2012 Chapter 1 • Compiling and Debugging 5
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Page 18 and 19: Recommended reading © 2012, QNX So
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Page 26 and 27: Header files in /usr/include © 201
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Page 34 and 35: Linking your modules © 2012, QNX S
Page 36 and 37: Optimizing the runtime linker © 20
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Page 50 and 51: A simple debug session © 2012, QNX
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Chapter 4 Tick, Tock: Understanding
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Oversleeping: errors in delays © 2
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Another hiccup with hardware timers
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What time is it? © 2012, QNX Softw
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Chapter 5 Transparent Distributed P
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Benefits of Qnet © 2012, QNX Softw
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How does it work? © 2012, QNX Soft
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Locating services using GNS © 2012
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Quality of Service (QoS) and multip
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Designing a system using Qnet © 20
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Designing a system using Qnet © 20
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Autodiscovery vs static © 2012, QN
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When should you use Qnet, TCP/IP, o
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Drivers for Qnet © 2012, QNX Softw
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Chapter 7 Heap Analysis: Making Mem
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Dynamic memory management © 2012,
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Dynamic memory management © 2012,
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Heap corruption © 2012, QNX Softwa
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Heap corruption © 2012, QNX Softwa
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Detecting and reporting errors © 2
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Memory leaks © 2012, QNX Software
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Compiler support © 2012, QNX Softw
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Compiler support © 2012, QNX Softw
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Chapter 9 Conventions for Recursive
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Structure of a multiplatform source
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Structure of a multiplatform source
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Specifying options © 2012, QNX Sof
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Using the standard macros and inclu
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Advanced topics © 2012, QNX Softwa
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Advanced topics © 2012, QNX Softwa
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Examples of creating Makefiles © 2
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Appendix B Using GDB In this append
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GDB commands © 2012, QNX Software
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GDB commands © 2012, QNX Software
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Running programs under GDB © 2012,
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Stopping and continuing © 2012, QN
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Examining the stack © 2012, QNX So
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Examining the stack © 2012, QNX So
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Examining source files © 2012, QNX
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Examining data © 2012, QNX Softwar
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Examining the symbol table © 2012,
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Altering execution © 2012, QNX Sof
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Altering execution © 2012, QNX Sof
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Appendix C ARM Memory Management In
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ARM-specific restrictions and issue
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ARM-specific features © 2012, QNX
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ARM-specific features © 2012, QNX
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Index © 2012, QNX Software Systems
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