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[musl]
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sigisemptyset.c
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#define _GNU_SOURCE
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#include <signal.h>
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#include <string.h>
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int sigisemptyset(const sigset_t *set)
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{
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static const unsigned long zeroset[_NSIG/8/sizeof(long)];
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return !memcmp(set, &zeroset, _NSIG/8);
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}