getpgrp(2)
NAME
getpid, getpgrp, getppid, getpgid - get process, process
group, and parent process IDs
SYNOPSIS
#include <unistd.h>
pid_t getpid(void);
pid_t getpgrp(void);
pid_t getppid(void);
pid_t getpgid(pid_t pid);
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.
The getpgid() function 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 0.
RETURN VALUES
Upon successful completion, these functions return the pro-
cess group ID. Otherwise, getpgid() returns (pid_t)-1 and
sets errno to indicate the error.
ERRORS
The getpgid() function will fail if:
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.
The getpgid() function may fail if:
EINVAL
The value of the pid argument is invalid.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| MT-Level | Async-Signal-Safe |
|_____________________________|_____________________________|
SEE ALSO
intro(2), exec(2), fork(2), getsid(2), setpgid(2),
setpgrp(2), setsid (2), signal(3C), attributes(5)
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