SETPGID(2) System Calls SETPGID(2)

NAME

setpgid - set process group ID

SYNOPSIS

#include <sys/types.h>
#include <unistd.h>

int setpgid(pid_t pid, pid_t pgid);

DESCRIPTION

The setpgid() function sets the process group ID of the process with ID
pid to pgid.


If pgid is equal to pid, the process becomes a process group leader. See
Intro(2) for more information on session leaders and process group
leaders.


If pgid is not equal to pid, the process becomes a member of an existing
process group.


If pid is equal to 0, the process ID of the calling process is used. If
pgid is equal to 0, the process specified by pid becomes a process group
leader.

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned and
errno is set to indicate the error.

ERRORS

The setpgid() function will fail if:

EACCES
The pid argument matches the process ID of a child process of
the calling process and the child process has successfully
executed one of the exec family of functions (see exec(2)).


EINVAL
The pgid argument is less than (pid_t) 0 or greater than or
equal to PID_MAX, or the calling process has a controlling
terminal that does not support job control.


EPERM
The process indicated by the pid argument is a session leader.


EPERM
The pid argument matches the process ID of a child process of
the calling process and the child process is not in the same
session as the calling process.


EPERM
The pgid argument does not match the process ID of the process
indicated by the pid argument, and there is no process with a
process group ID that matches pgid in the same session as the
calling process.


ESRCH
The pid argument does not match the process ID of the calling
process or of a child process of the calling process.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Standard |
+--------------------+-------------------+
|MT-Level | Async-Signal-Safe |
+--------------------+-------------------+

SEE ALSO

Intro(2), exec(2), exit(2), fork(2), getpid(2), getsid(2), attributes(7),
standards(7)

December 28, 1996 SETPGID(2)