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Test the getpid() function
#include <stdio.h>
#include <sys/types.h>
int main(void){
pid_t this_process;
this_process = getpid();
printf("this process value is %d and hex value if 0x%x\n", this_process,this_process);

it gives me a warning:

getpid.c:6:17: warning: implicit declaration of function 'getpid' is invalid in
C99 [-Wimplicit-function-declaration]
this_process = getpid();
1 warning generated.

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