.It Er 36 EINPROGRESS Em "Operation now in progress" .
An operation that takes a long time to complete (such as
a
.It Er 36 EINPROGRESS Em "Operation now in progress" .
An operation that takes a long time to complete (such as
a
The parent process ID of a process is initially the process ID of its creator.
If the creating process exits,
the parent process ID of each child is set to the ID of a system process,
The parent process ID of a process is initially the process ID of its creator.
If the creating process exits,
the parent process ID of each child is set to the ID of a system process,
.It Process Group
Each active process is a member of a process group that is identified by
a non-negative integer called the process group ID. This is the process
.It Process Group
Each active process is a member of a process group that is identified by
a non-negative integer called the process group ID. This is the process
but is in a different process group.
Note that when a process exits, the parent process for its children
is changed to be
but is in a different process group.
Note that when a process exits, the parent process for its children
is changed to be
which is in a separate session.
Not all members of an orphaned process group are necessarily orphaned
processes (those whose creating process has exited).
which is in a separate session.
Not all members of an orphaned process group are necessarily orphaned
processes (those whose creating process has exited).
.It Special Processes
The processes with process IDs of 0, 1, and 2 are special.
Process 0 is the scheduler. Process 1 is the initialization process
.It Special Processes
The processes with process IDs of 0, 1, and 2 are special.
Process 0 is the scheduler. Process 1 is the initialization process
and is the ancestor of every other process in the system.
It is used to control the process structure.
Process 2 is the paging daemon.
and is the ancestor of every other process in the system.
It is used to control the process structure.
Process 2 is the paging daemon.