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#include <u.h>
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#include <libc.h>
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char*
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mktemp(char *as)
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{
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	char *s;
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	unsigned pid;
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	int i;
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	char err[ERRMAX];
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	pid = getpid();
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	s = as;
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	while(*s++)
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		;
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	s--;
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	while(*--s == 'X') {
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		*s = pid % 10 + '0';
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		pid = pid/10;
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	}
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	s++;
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	i = 'a';
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	while(access(as, 0) != -1) {
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		if (i == 'z')
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			return "/";
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		*s = i++;
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	}
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	err[0] = '\0';
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	errstr(err, sizeof err);	/* clear the error */
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	return as;
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}