Manual page for getpid(2)
getpid, getpgrp, getppid, getpgid - get process, process group, and parent process IDs
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
pid_t getpid(void);
pid_t getpgrp(void);
pid_t getppid(void);
pid_t getpgid(pid_t pid);
MT-LEVEL
Async-Signal-Safe
DESCRIPTION
getpid()
returns the process
ID
of the calling process.
getpgrp()
returns the process group
ID
of the calling process.
getppid()
returns the parent process
ID
of the calling process.
getpgid()
returns the process group
ID
of the process whose process ID is equal to
pid,
or the process group
ID
of the calling process, if
pid
is equal to zero.
RETURN VALUES
Upon successful completion,
all
return the process group
ID.
On failure,
getpgid() returns a value of
(pid_t) -1 and sets
errno to indicate the error.
ERRORS
getpgid()
will fail if one or more of the following is true:
- EPERM
-
The process whose process
ID
is equal to
pid
is not in the same session as the calling process, and
the implementation does not allow access to the process group
ID
of that process from the calling process.
- ESRCH
-
There is no process with a process
ID
equal to pid.
SEE ALSO
intro.2
exec.2
fork.2
getsid.2
setpgid.2
setpgrp.2
signal.3c
Created by unroff & hp-tools.
© by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97
