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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include "sys9.h"
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pid_t
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getppid(void)
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{
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	int n, f;
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	char ppidbuf[15];
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	f = open("#c/ppid", 0);
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	n = read(f, ppidbuf, sizeof ppidbuf);
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	if(n < 0)
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		errno = EINVAL;
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	else
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		n = atoi(ppidbuf);
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	close(f);
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	return n;
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}