path: root/doc
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1 files changed, 29 insertions, 0 deletions
diff --git a/doc/networking/driver.t b/doc/networking/driver.t
index d27f3ef1ee..c6e62043a0 100644
--- a/doc/networking/driver.t
+++ b/doc/networking/driver.t
@@ -110,6 +110,35 @@ The value returned is the value returned by the @code{rtems_event_receive}.
@end itemize
+@section Network Driver Makefile
+Network drivers are considered part of the BSD network package and as such
+are to be compiled with the appropriate flags.
+@end example
+Defining these macros tells the network header files that the driver
+is to be compiled with extended visibility into the network stack. This
+is in sharp contrast to applications that simply use the network stack.
+Applications do not require this level of visibility and should stick
+to the portable application level API.
+As a direct result of being logically internal to the network stack,
+network drivers use the BSD memory allocation routines This means,
+for example, that malloc takes three arguments. See the SONIC
+device driver (@code{c/src/lib/libchip/network/sonic.c}) for an example
+of this. Because of this, network drivers should not include
+@code{<stdlib.h>}. Doing so will result in conflicting definitions
+of @code{malloc()}.
+@b{Application level} code including network servers such as the FTP
+daemon are @b{not} part of the BSD network package and should not be
+compiled with the BSD network flags. They should include
+@code{<stdlib.h>} and not define the network stack visibility
@section Write the Driver Attach Function
The driver attach function is responsible for configuring the driver
and making the connection between the network stack