#include <unistd.h> int
setpgid (pid_t pid pid_t pgrp); int
setpgrp (pid_t pid pid_t pgrp);
DESCRIPTION
The
setpgid ();
system call
sets the process group of the specified process
Fa pid
to the specified
Fa pgrp .
If
Fa pid
is zero, then the call applies to the current process.
If the affected process is not the invoking process, then it must be a
child of the invoking process, it must not have performed an
exec(3)
operation, and both processes must be in the same session.
The requested process group ID must already exist in the session of
the caller, or it must be equal to the target process ID.
RETURN VALUES
Rv -std setpgid
COMPATIBILITY
The
setpgrp ();
system call
is identical to
setpgid (,);
and is retained for calling convention compatibility with historical
versions of
BSD .
ERRORS
The
setpgid ();
system call
will fail and the process group will not be altered if:
Bq Er EINVAL
The requested process group ID is not legal.
Bq Er ESRCH
The requested process does not exist.
Bq Er ESRCH
The target process is not the calling process or
a child of the calling process.
Bq Er EACCES
The requested process is a child of the calling process,
but it has performed an
exec(3)
operation.
Bq Er EPERM
The target process is a session leader.
Bq Er EPERM
The requested process group ID is not in the session of the caller,
and it is not equal to the process ID of the target process.
