DS200TCRAG1ABC communication module

DS200TCRAG1ABC communication module

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In RTEMS 5.1, the list of free file descriptors has a LIFO ordering in contrast to previous versions
where it was a FIFO. This means if an application regularly opens and closes files (or sockets)
it sees the whole range of file descriptors. The reason for this change was to increase the time
before file descriptors are reused to more likely catch a file descriptor use after close.
This change may surface application issues. If the configured file descriptor maximum
is greater than the DS200TCRAG1ABC defined by Newlib to
64, then calls to select() are undefined behaviour and may corrupt the thread stack. In particular,DS200TCRAG1ABC may result in an out of bounds access. It is possible to define a custom DS200TCRAG1ABC
The application must ensure that the custom DS200TCRAG1ABCis defined beforeDS200TCRAG1ABC in all modules used by the application, for example via a global compiler command
line define. This applies also to all third-party libraries used by the application.
13.1.4 Networking
The following code samples provides a simple way to initialise and start networking with the
BSD Library’s (libbsd) networking stack. The simplest method to configure the networking
stack is to provide a /etc/rc,conf file on your target. If your target has no non-volatile media
for a file system create the rc.conf file each time your application starts.
The rc.conf support in libbsd provides a number of needed support settings. We recommend
you search for FreeBSD and rc.conf to view the available online documentation that FreeBSD
providesThe tool suite for RTEMS 6 uses at least GCC 10. GCC 10 and later enable -fno-common by
default. Code bases which never used this option before may observe now multiple definition
linker errors. For example, if global variables are declared and defined in header files (usually
a missing extern in the header file).

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