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#include <u.h>
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#include <libc.h>
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/*
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 * Format:
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  3 r  M    4 (0000000000457def 11 00)   8192      512 /rc/lib/rcmain
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 */
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int
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iounit(int fd)
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{
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	int i, cfd;
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	char buf[128], *args[10];
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	snprint(buf, sizeof buf, "#d/%dctl", fd);
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	cfd = open(buf, OREAD);
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	if(cfd < 0)
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		return 0;
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	i = read(cfd, buf, sizeof buf-1);
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	close(cfd);
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	if(i <= 0)
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		return 0;
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	buf[i] = '\0';
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	if(tokenize(buf, args, nelem(args)) != nelem(args))
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		return 0;
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	return atoi(args[7]);
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}