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Top Forums Programming Linux System C headers puzzling Post 302390141 by Loic Domaigne on Wednesday 27th of January 2010 03:39:45 AM
Old 01-27-2010
Hi,

those functions qualifiers are simply compiler directives to tell gcc: this function does not throw any exception, and the first pointer must be non NULL. With this information, the compiler can better optimize the code around the call to chmod(), especially if you're calling chmod() from a C++ code.

These macro can be found in /usr/include/sys/cdefs.h by the way.

HTH,
Loïc.
 

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FAUCC(1)																  FAUCC(1)

NAME
faucc - C compiler generating Intel code for 16 bit/32 bit CPUs. SYNOPSIS
faucc [ -B path ] [ -D MACRO [=def]] [ -E ] [ -I path ] [ -L path ] [ -MD ] [-MF file ] [ -MP ] [ -MT target ] [ -O level ] [ -S ] [ -T script ] [ -U macro ] [ -Wl,arg ] [ -Xlinker arg ] [ -b arch ] [ -c ] [ -f arg ] [ -m arch ] [ -nostdlib ] [ -o output ] [ -print-lib-faucc-file-name ] [ --freestanding ] [ --no-stack-protector ] { file ...} DESCRIPTION
faucc is a C compiler, that can generate Intel 16 bit or 32 bit Code. OPTIONS
faucc tries to mimic the options of gcc. A number of options will be passed to the C preprocessor cpp or to the linker (done via a call to the c-compiler gcc) in unmodified form. -B path Override the directory prefix where cc1 is looked up with path. -D MACRO, -D MACRO=def Define MACRO with the optional initial definition def. If def is omitted, it defaults to 1. -E Only perform preprocessing, but do not run the compiler. -I path Add path to the include path in which header files are searched. -L path Add path to the library search path, in which the linker will look for libraries. -MD Output dependency information while preprocessing. -MF, file Output dependency information while preprocessing to file. -MP, When the preprocessor should output dependency information, it will generate PHONY targets for each dependency. -MT target When the preprocessor should output dependency information, use target as the dependency rule target. -O level Currently ignored. -S Output assembly code. -T script Use script as linker script. -U macro Undefine a previously defined macro. -Wl,arg, -Xlinker arg Pass arg to the linker. -b arch Generate code for arch (either i286 or i386) -c Perform compilation, but do not link. -f arg Pass code generation argument arg to the compiler. See the cc1 man page for possible arguments. -m arch Currently ignored. -nostdlib With this option, the linker will only search for libraries that are passed as command line arguments. -o file Write output to file. -print-libfaucc-file-name Print the full path of the internal compiler library libfaucc.a. -static Perform static linking. --freestanding, --no-stack-protector Currently ignored. EXAMPLES
faucc -c hello-world.c -o hello-world.o Compile the program hello-world.c and output the object as hello-wolrd.o. faucc -S -b i286 -o test.s test.c Compile the program test.c to 16 bit code and output the assembly listing to test.s, but do not assemble or link the result yet. SEE ALSO
cc1(1) , cpp(1) , gcc(1) , ld(1) CONTACT
Please report all bugs to FAUcc Team <info@faumachine.org>. FAUcc Homepage [1]. AUTHOR
FAUcc Team COPYRIGHT
Copyright (C) 2009 FAUcc Team. Developed at Friedrich Alexander University Erlangen-Nuremberg. FAUcc comes with ABSOLUTELY NO WARRANTY. FAUcc is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See COPYING for details. NOTES
1. FAUcc Homepage http://www.faumachine.org FAUcc Team 03/08/2009 FAUCC(1)
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