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#include <u.h>
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#include <libc.h>
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void
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perror(char *s)
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{
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	char buf[ERRMAX];
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	buf[0] = '\0';
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	errstr(buf, sizeof buf);
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	if(s && *s)
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		fprint(2, "%s: %s\n", s, buf);
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	else
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		fprint(2, "%s\n", buf);
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}