forked from Archive/PX4-Autopilot
48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
lib
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===
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This directory contains numerous, small functions typically associated with
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what you would expect to find in a standard C library. The sub-directories
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in this directory contain standard interface that can be executed by user-
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mode programs.
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Normally, NuttX is built with no protection and all threads running in kerne-
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mode. In that model, there is no real architectural distinction between
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what is a kernel-mode program and what is a user-mode program; the system is
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more like on multi-threaded program that all runs in kernel-mode.
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But if the CONFIG_NUTTX_KERNEL option is selected, NuttX will be built into
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distinct user-mode and kernel-mode sections. In that case, most of the
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code in the nuttx/ directory will run in kernel-mode with with exceptions
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of (1) the user-mode "proxies" found in syscall/proxies, and (2) the
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standard C library functions found in this directory. In this build model,
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it is critical to separate the user-mode OS interfaces in this way.
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Sub-Directories
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===============
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The files in the lib/ directory are organized (mostly) according which file
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in the include/ directory provides the prototype for library functions. So
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we have:
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libgen - libgen.h
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math - math.h and fixedmath.h
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mqueue - pthread.h
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net - Various network-related header files: netinet/ether.h, arpa/inet.h
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pthread - pthread.h
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queue - queue.h
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sched - sched.h
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semaphore - semaphore.h
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stdio - stdio.h
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stdlib - stdlib.h
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string - string.h
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time - time.h
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unistd - unistd.h
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There is also a misc/ subdirectory that contains various internal functions
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and interfaces from header files that are too few to warrant their own sub-
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directory:
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misc - Nonstandard "glue" logic, debug.h, crc32.h, dirent.h
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