Get the size of the thread's guard area
#include <pthread.h> int pthread_attr_getguardsize( const pthread_attr_t* attr, size_t* guardsize );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The pthread_attr_getguardsize() function gets the value of the thread guardsize attribute from the attribute structure attr.
POSIX 1003.1 XSI
Processes and Threads chapter of Getting Started with QNX Neutrino