vxworks programmer's guide.pdf - DAQ Plone Site

VxWorks 5.4
Programmer’s Guide
The Network Task: tNetTask
The tNetTask daemon handles the task-level functions required by the VxWorks
network.
The Target Agent Task: tWdbTask
The target agent task, tWdbTask, is created if the target agent is set to run in task
mode; see 8.6.1 Scaling Down VxWorks, p.344. It services requests from the Tornado
target server; for information on this server, see the Tornado User’s Guide: Overview.
Tasks for Optional Components
The following VxWorks system tasks are created if their associated configuration
constants are defined; for more information, see 8.5 Configuring VxWorks, p.337.
tShell
If you have included the target shell in the VxWorks configuration, it is
spawned as this task. Any routine or task that is invoked from the target shell,
rather than spawned, runs in the tShell context. For more information, see
9. Target Shell.
tRlogind
If you have included the target shell and the rlogin facility in the VxWorks
configuration, this daemon allows remote users to log in to VxWorks. It
accepts a remote login request from another VxWorks or host system and
spawns tRlogInTask and tRlogOutTask. These tasks exist as long as the
remote user is logged on. During the remote session, the shell’s (and any other
task’s) input and output are redirected to the remote user. A tty-like interface
is provided to the remote user through the use of the VxWorks pseudoterminal
driver, ptyDrv. For more information, see 3.7.1 Serial I/O Devices
(Terminal and Pseudo-Terminal Devices), p.118 and the reference entry for
ptyDrv.
tTelnetd
If you have included the target shell and the telnet facility in the VxWorks
configuration, this daemon allows remote users to log in to VxWorks with
telnet. It accepts a remote login request from another VxWorks or host system
and spawns the input task tTelnetInTask and output task tTelnetOutTask.
These tasks exist as long as the remote user is logged on. During the remote
session, the shell’s (and any other task’s) input and output are redirected to the
remote user. A tty-like interface is provided to the remote user through the use
of the VxWorks pseudo-terminal driver, ptyDrv. See 3.7.1 Serial I/O Devices
(Terminal and Pseudo-Terminal Devices), p.118 and the reference entry for
ptyDrv for further explanation.
44