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Sample Application to implement timed read
#include <sys/time.h>

int main()
{
fd_set fdset;
struct timeval timeout;
int rc;
int val;

timeout.tv_sec = 6; /* wait for 6...

see non blocking read() help, you can do with that

Are you including that header file in any other header file.
If Yes, that may due to multiple inclusion of that header file, may be included indirectly from some other header file.

Between mmap and shared memory which is the best method of sharing data between multiple applications, interms of speed?

Thanks for the reply, I will post in c programming category also, thanks again

Between mmap and shared memory which is the best method of sharing data between multiple applications, interms of speed?