[CLUE-Tech] C programming question

[Keith Hellman]

I would do something like this - many variations exist however, for instance keeping beep() as a
static inline within myincludes.h - then you don't have an extra .c module.

CAVEATS:  Most of this is from memory, but I think it works.  I am assuming that gcc sets DEBUG if
-g option is provided; if thats not the case you would use 'gcc -DDEBUG -g ...'

HTH

myincludes.h =================================================================
#ifdef DEBUG
void beep( void );
#else
static inline void beep( void ) {}
#endif

mylib.c ======================================================================
#ifdef DEBUG
void beep( void )
{
	int c;
	char* beep_args[2] = { "/myhome/bin/beep", NULL };
	switch( c = fork()) {
		case	0	:	/* child */
			execv( beep_args[0], beep_args );
			_exit(0)
			break;
		case	-1	:	/*  yikes! */
			break;
		default		:	/*  need to wait for execution to complete? */
			{
				int ec, again;
				do {
					again = 0;
					ec = wait(c);
					if(( ec == -1 ) && ( errno == EINTR )) again = 1;
				} while( again );
				return ec;
			}
			break;
	}

	return -1;
}
#endif

yourapp.c =======================================================================
#include <myincludes.h>
int main( int argc, char* argv[] )
{
	/*  Debug test */
	beep();
	return 0;
}

COMPILE LINES ===================================================================
# This line won't make noise
gcc -o yourapp yourapp.c mylib.c; ./yourapp 
# This line will
gcc -g noisy yourapp.c mylib.c; ./noisy

--- Dave Price <davep at kinaole.org> wrote:
> I am trying to learn a bit more about C, and have a silly question for
> which i cannot find an answer.
> 
> My PC does not have a speaker, so \a (terminal bell or alert) does
> nothing.  I have written a simple stand alone program that beeps the
> soundcard with a short .wav file instead.
> 
> Question:  What is the 'right' way to setup this program so that i can
> have a single function beep() which i can import into other programs
> when desired?
> 
> aloha (& TIA),
> dave
> _______________________________________________
> CLUE-Tech mailing list
> CLUE-Tech at clue.denver.co.us
> http://clue.denver.co.us/mailman/listinfo/clue-tech


=====
Keith E. Hellman
kehellman at yahoo.com

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