311f42bbac
Replace the pipe() macro definition with a proper function implementation to improve POSIX compliance and debugging capabilities. The new pipe() function serves as a wrapper around pipe2() with flags set to 0. Changes include: - Convert pipe() from macro to function declaration in unistd.h - Add lib_pipe.c implementation file with proper function documentation - Update build system files (CMakeLists.txt and Make.defs) to include the new source file when CONFIG_PIPES is enabled - Add pipe() entry to libc.csv for symbol tracking This change allows for better debugging, proper symbol resolution, and follows NuttX coding standards for library function implementations. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
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