The GNU C Library - Process Identification

Process Identification

The pid_t data type represents process IDs. You can get the process ID of a process by calling getpid . The function getppid returns the process ID of the parent of the current process (this is also known as the parent process ID). Your program should include the header files `unistd.h' and `sys/types.h' to use these functions.

Data Type pid_t

The pid_t data type is a signed integer type which is capable of representing a process ID. In the GNU library, this is an int .

Function pid_t getpid (void)

The getpid function returns the process ID of the current process.

Function pid_t getppid (void)

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