jehanne/qa/kern/wait_note.c

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/*
* This file is part of Jehanne.
*
* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <u.h>
#include <lib9.h>
int
ignore_note(void *v, char *s)
{
print("%d: note received: %s\n", getpid(), s);
return 1;
}
void
main(void)
{
Waitmsg *w;
int i = 0, cpid;
if (!atnotify(ignore_note, 1)){
fprint(2, "%r\n");
exits("atnotify fails");
}
switch(cpid = fork()){
case -1:
print("FAIL: fork\n");
exits("FAIL");
case 0:
print("%d: child: waiting 3 sec\n", getpid());
sleep(3000);
print("%d: child: sending note to parent\n", getpid());
postnote(PNPROC, getppid(), "test");
exits(0);
default:
break;
}
print("%d: start waiting for child to complete\n", getpid());
InterruptedByNote:
w = wait();
if(w == nil){
if(i==0){
++i;
print("%d: wait interrupted by note, try again once\n", getpid());
goto InterruptedByNote;
}
print("FAIL: no wait msg\n");
exits("FAIL");
}
if(cpid != w->pid){
print("FAIL: wrong Waitmsg: pid = %d instead of expected %d\n", w->pid, cpid);
exits("FAIL");
}
print("Got Waitmsg for child %d\n", w->pid);
print("PASS\n");
exits("PASS");
}