getpid, getppid − get process identification

#include <sys/types.h>
#include <unistd.h>

pid_t getpid(void);
pid_t getppid(void);

getpid returns the process ID of the current process. (This is often used by routines that generate unique temporary file names.)

getppid returns the process ID of the parent of the current process.

POSIX, BSD 4.3, SVID

exec(3), fork(2), kill(2), mkstemp(3), tmpnam(3), tempnam(3), tmpfile(3)