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use restrict everywhere it's required by c99 and/or posix 2008
to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
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@ -3,7 +3,7 @@
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#include <pthread.h>
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#include "syscall.h"
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int pthread_sigmask(int how, const sigset_t *set, sigset_t *old)
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int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict old)
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{
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int ret;
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if ((unsigned)how - SIG_BLOCK > 2U) return EINVAL;
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