getpid, getpgrp, getppid - Get the process ID, process
group ID, or parent process ID
void ); pid_t getpgrp
void ); pid_t getppid
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
Interfaces documented on this reference page conform to
industry standards as follows:
getpid(), getpgrp(), getppid(): POSIX.1, XSH4.0, XSH4.2,
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
The getpid() function returns the process ID of the calling
The getpgrp() function returns the process group ID of the
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.
Functions: fork(2), kill(2), setpgid(2), setsid(2),
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