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(libc.info)Process Identification

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Process Identification
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   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.