NAME

getpid, getpgrp, getppid − Get the process ID, process group ID, or parent process ID

SYNOPSIS

#include <unistd.h>
pid_t getpid
        void ); pid_t getpgrp
        void ); pid_t getppid
        void );

Application developers might want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being developed for multiple platforms. The additional #include statement is not required on Tru64 UNIX systems or by ISO or X/Open standards, but might be required on other vendors’ systems that conform to these standards. 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

getpid(), getpgrp(), getppid():  POSIX.1, XSH4.0, XSH4.2, XSH5.0

Refer to the standards(5) reference page for more information about industry standards and associated tags. 

DESCRIPTION

The getpid() function returns the process ID of the calling process. 

The getpgrp() function returns the process group ID of the calling process. 

The getppid() function returns the parent process ID of the calling process. When a process is created, its parent process ID is the process ID of its parent process. If a parent process exits, the parent process IDs of its child processes are changed to the process ID of the init program. 

SEE ALSO

Functions: fork(2), kill(2), setpgid(2), setsid(2), wait(2)

Commands: init(8)

Standards: standards(5)