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)