C, error of compilation during using “usleep” function

Question

I use Ubuntu Linux. When I try use \"usleep\" function, I get information about \"implicit declaration of function usleep\". Below is the error code:

muteks.         


        

Answer 1

#include <unistd.h>

See the man usleep

Answer 2

usleep() is declared in the standard header unistd.h which you haven't included. Include it:

#include <unistd.h>

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On a relevant note: usleep() has been removed since POSIX-2008 and recommends to use nanosleep() instead.