ref: 445fc8e5a7ab20dc0613a6b1faedfe7f5183e7a9
dir: /sys/src/ape/lib/ap/plan9/setsid.c/
#include "lib.h"
#include <unistd.h>
#include "sys9.h"
pid_t
setsid(void)
{
if(_RFORK(RFNAMEG|RFNOTEG) < 0){
_syserrno();
return -1;
}
_sessleader = 1;
return getpgrp();
}