/* * This file is part of Jehanne. * * Copyright (C) 2016 Giacomo Tesio * * Jehanne is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2 of the License. * * Jehanne is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Jehanne. If not, see . */ #include #include int getppid(void) { char buf[20]; int ppid; ppid = open("#c/ppid", OREAD); if(ppid < 0){ // probably rfork(RFNOMNT) ppid = open("/dev/ppid", OREAD); if(ppid < 0){ werrstr("getppid: cannot open neither #c/ppid nor /dev/ppid"); return -1; // probably rfork(RFNOMNT|RFCNAMEG) } } memset(buf, 0, sizeof(buf)); assert(read(ppid, buf, sizeof(buf)) > 0); close(ppid); return atol(buf); }