SIGUNUSED
From Wikipedia, the free encyclopedia
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SA_SIGINFO macros
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On some Unix-like platforms, SIGUNUSED is a signal that has no purpose at present but is intended for future use. The symbolic constant for SIGUNUSED is defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms.
[edit] Etymology
SIG is a common prefix for signal names. UNUSED is the word unused.
[edit] Usage
In Linux 2.6 on the x86, PowerPC and SuperH architectures, signal 31 is designated for future use as SIGSYS; since SIGSYS is currently unimplemented, the signal number is temporarily assigned to SIGUNUSED instead.
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