131 lines
2.6 KiB
C
131 lines
2.6 KiB
C
/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, version 3 of the License.
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*
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* Jehanne is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <u.h>
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#include <lib9.h>
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int r1;
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int r2;
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#define CHILD_READY(pid) ((long)rendezvous(&r1, (void*)(~(pid))))
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//#define C2P_READY(pid) ((long)rendezvous(&r2, (void*)(~(pid))))
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int *__target_pid;
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static void
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forwarding_note_handler(void *ureg, char *note)
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{
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postnote(PNPROC, *__target_pid, note);
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noted(NDFLT);
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}
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static void
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donothing(void)
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{
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int i = 0;
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while(++i < 100)
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sleep(3000);
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exits(nil);
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}
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static int
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crazy_fork(void)
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{
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int father = getpid();
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int p2c;
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long c2p = -1, child = -1;
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switch(p2c = rfork(RFPROC|RFMEM)){
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case -1:
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return -1;
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case 0:
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switch(c2p = rfork(RFPROC|RFMEM)){
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case -1:
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exits("rfork (c2p)");
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case 0:
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switch(child = fork()){
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case -1:
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exits("rfork (child)");
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case 0:
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return 0;
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default:
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while(CHILD_READY(child) == -1)
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;
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*__target_pid = father;
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notify(forwarding_note_handler);
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donothing();
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}
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default:
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while((child = CHILD_READY(-3)) == -1)
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;
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child = ~child;
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*__target_pid = child;
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notify(forwarding_note_handler);
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donothing();
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}
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default:
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break;
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}
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return p2c;
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}
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int
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pass_on_die(void *v, char *s)
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{
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if(strncmp(s, "die", 4) == 0){
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print("PASS\n");
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exits("PASS");
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}
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return 0;
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}
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void
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main(void)
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{
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int c, target_pid = 0;
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__target_pid = &target_pid;
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if (!atnotify(pass_on_die, 1)){
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fprint(2, "%r\n");
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exits("atnotify fails");
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}
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c = crazy_fork();
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switch(c){
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case -1:
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print("FAIL: fork\n");
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exits("FAIL");
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case 0:
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print("child is %d; child's parent is %d\n", getpid(), getppid());
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*__target_pid = getppid();
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notify(forwarding_note_handler);
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/* wait to be killed */
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donothing();
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break;
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default:
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print("father is %d; forked child is %d\n", getpid(), c);
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sleep(1000); /* give children time to notify() */
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print("starting note chain\n");
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postnote(PNPROC, c, "die");
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/* wait to be killed by the chain */
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sleep(30000);
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}
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print("FAIL\n");
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exits("FAIL");
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}
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