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Top Forums Programming mysterious #define Post 302118997 by frequency8 on Friday 25th of May 2007 10:43:40 PM
Old 05-25-2007
That response reminds me of the day I decided I wasn't cut out to be a Math Major. In my Linear Algebra class, my Professor said "There is something in the vector space. That something is nothingness."

Okay, so now, let me get this right.

When I go
#define SOMETHING

Something is being defined, but we aren't too sure what that something is? And then later on, when I see

#ifdef JOB_CONTROL
signal(SIGTSTP,(RETSIGTYPE (*)())susp);
#endif /*JOB_CONTROL*/

We can use that something, which aren't too sure of what it is, to test to see if the shell supports job control?
 

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assert.h(3HEAD) 						      Headers							   assert.h(3HEAD)

NAME
assert.h, assert - verify program assertion SYNOPSIS
#include <assert.h> DESCRIPTION
The <assert.h> header defines the assert() macro. It refers to the macro NDEBUG which is not defined in the header. If NDEBUG is defined as a macro name before the inclusion of this header, the assert() macro is defined simply as: #define assert(ignore)((void) 0) Otherwise, the macro behaves as described in assert(3C). The assert() macro is redefined according to the current state of NDEBUG each time <assert.h> is included. The assert() macro is implemented as a macro, not as a function. If the macro definition is suppressed in order to access an actual func- tion, the behavior is undefined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
assert(3C), attributes(5), standards(5) SunOS 5.11 10 Sep 2004 assert.h(3HEAD)
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