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#include "lib.h"
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include "sys9.h"
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int
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setpgid(pid_t pid, pid_t pgid)
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{
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	int n, f;
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	char buf[50], fname[30];
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	if(pid == 0)
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		pid = getpid();
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	if(pgid == 0)
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		pgid = getpgrp();
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	sprintf(fname, "/proc/%d/noteid", pid);
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	f = open(fname, 1);
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	if(f < 0) {
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		errno = ESRCH;
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		return -1;
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	}
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	n = sprintf(buf, "%d", pgid);
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	n = write(f, buf, n);
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	if(n < 0)
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		_syserrno();
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	else
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		n = 0;
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	close(f);
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	return n;
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}