| GETPID(2) | System Calls Manual | GETPID(2) | 
getpid, getppid —
#include <unistd.h>
pid_t
  
  getpid(void);
pid_t
  
  getppid(void);
getpid() returns the process ID of the calling process.
  The ID is guaranteed to be unique and is useful for constructing temporary
  file names.
getppid() returns the process ID of the
    parent of the calling process.
getpid() and getppid()
  functions are always successful, and no return value is reserved to indicate
  an error.
getpid() and getppid() conform
  to IEEE Std 1003.1-1990 (“POSIX.1”).
getpid() function appeared in
  Version 5 AT&T UNIX.
| April 3, 2010 | NetBSD 10.0 |