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#include "lib.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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static int
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note(int pid, char *msg, char *fmt)
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{
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	int f;
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	char pname[50];
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	sprintf(pname, fmt, pid);
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	f = open(pname, O_WRONLY);
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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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	if(msg != 0 && write(f, msg, strlen(msg)) < 0){
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		close(f);
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		errno = EPERM;
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		return -1;
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	}
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	close(f);
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	return 0;
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}
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int
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kill(pid_t pid, int sig)
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{
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	char *msg;
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	int sid, r, mpid;
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	if(sig == 0)
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		msg = 0;
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	else {
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		msg = _sigstring(sig);
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		if(msg == 0) {
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			errno = EINVAL;
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			return -1;
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		}
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	}
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	if(pid < 0) {
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		sid = getpgrp();
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		mpid = getpid();
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		if(setpgid(mpid, -pid) == 0) {
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			r = note(mpid, msg, "/proc/%d/notepg");
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			setpgid(mpid, sid);
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		} else {
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			r = -1;
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		}
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	} else if(pid == 0)
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		r = note(getpid(), msg, "/proc/%d/notepg");
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	else
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		r = note(pid, msg, "/proc/%d/note");
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	return r;
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}