xv6/usertests.c
rtm 8b4e2a08fe swtch saves callee-saved registers
swtch idles on per-CPU stack, not on calling process's stack
fix pipe bugs
usertest.c tests pipes, fork, exit, close
2006-07-01 21:26:01 +00:00

56 lines
910 B
C

// simple fork and pipe read/write
char buf[2048];
void
pipe1()
{
int fds[2], pid;
int seq = 0, i, n, cc, total;
pipe(fds);
pid = fork();
if(pid == 0){
close(fds[0]);
for(n = 0; n < 5; n++){
for(i = 0; i < 1033; i++)
buf[i] = seq++;
if(write(fds[1], buf, 1033) != 1033){
puts("pipe1 oops 1\n");
exit(1);
}
}
exit(0);
} else {
close(fds[1]);
total = 0;
cc = 1;
while(1){
n = read(fds[0], buf, cc);
if(n < 1)
break;
for(i = 0; i < n; i++){
if((buf[i] & 0xff) != (seq++ & 0xff)){
puts("pipe1 oops 2\n");
return;
}
}
total += n;
cc = cc * 2;
if(cc > sizeof(buf))
cc = sizeof(buf);
}
if(total != 5 * 1033)
puts("pipe1 oops 3\n");
close(fds[0]);
}
puts("pipe1 ok\n");
}
main()
{
pipe1();
while(1)
;
}