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Moving pending signals to task group; Logic to recover some MQ resources on pthread_cacancel or task_delete; Now obeys rules for delivering signals to a process with threads

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Misc clean; mark assertions as non-returning; allow toolchain prefix to be overriden from make command line

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Add support for a login script (in addition to the init script); Add logic so that a USB console session can connect and reconnect to the USB serial device

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The USB monitor now works with the stm32f4discover/nsh configuration (but not with the usbnsh configuration)

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Add a start hook that can be setup to call a function in the context of a new thread before the new threads main() has been called.

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Fix some compilation errors when child status disabled; new waitpid logic not encoding/decoding status properly

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Fix some missing logic and inconsistencies in child status logic; Fix a bug introduced into sigaction()

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Yet another repair for the previouis botched recvfrom() fix; Fix telnet driver: It needs to break out of the read loop if 0 (meaning not conneced) of a value < 0 (an error) is encountered.

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Add internal API task_reparent(), used in posix_spawn().  Move libc/spawn/lib_ps.c to sched/task_posixspawn.c; Move libc/spawn/spawn.h to include/nuttx/spawn.h

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NSH will now run files from the file system; Add logic to unload and clean-up after running a task from a file system; Extensions to builtin apps from Mike Smith

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Change the way thread priority is handled in binfmt/ to better match the way that priority is set up for the builtin tasks

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Rename apps/include/apps.h to builtin.h.  Move parts of apps/builtins/exec_builtin.c to binfmt/libbuiltin/libbuiltin_utils.c

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