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#include "lib.h"
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#include <signal.h>
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#include <errno.h>
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sigset_t _psigblocked;
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int
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sigprocmask(int how, sigset_t *set, sigset_t *oset)
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{
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	if(oset)
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		*oset = _psigblocked;
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	if(how==SIG_BLOCK)
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		_psigblocked |= *set;
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	else if(how==SIG_UNBLOCK)
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		_psigblocked &= ~*set;
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	else if(how==SIG_SETMASK)
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		_psigblocked = *set;
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	else{
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		errno = EINVAL;
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		return -1;
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	}
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	return 0;
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}