modified: components/libc/posix/signal/posix_signal.c Add comments to the sigqueue function, although it does not have an internal implementation
modified: components/libc/posix/signal/posix_signal.h Added detailed explanation to all members of the rt_signal_value enumeration
* [add] the function realization of signal for posix.
* [update] the posix support for armclang.
* [add] the new macro "RT_USING_POSIX_TIMER".
* [modify] select "RT_USING_SOFT_TIMER" when use posix'timer.
* [bug] optimize the logic for the "time_xxx" functions.
* [modify] use "RT_USING_POSIX_TIMER" to protect the macro definition.
* [modify] error code when except happened.
* [delete] the "environ" is useless at this time.
Troy
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Huang Xilong
XzcUbuntu
Meco Man
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