getpid(2)getpid(2)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 stan‐
dards.
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards 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)getpid(2)
