[Minios-devel] [C stubdom] printf to console not complete

[Lele Ma <lelema.zh@xxxxxxxxx>]

Dear all, 

This is Lele Ma, a graduate student from The College of William and Mary. I have a quick question about printings  in MiniOS using printf. 

It seems that if I print many lines of strings consecutively, many lines would got cut at the tail.

Here is an example code I tested in C stubdom:

// file /stubdom/c/main.c

int main(void) {  

  int i = 0;

  for (i=0; i< 1000; i++){

    printf("print %d \n", i);

  }

  return 0;

}

After build and run, the output got cut in the middle and only the first ~400 lines got printed, as following:

------------- output begin --------------------- 

root@xen-4.9.1: c # xl create -c ../../extras/mini-os/domain_config

Parsing config from ../../extras/mini-os/domain_config

...               

print 427    <---looks good

print 428 

print 429 

print 430 

print 431 

print 432 

print 433 

print 434   <--- prints got cut here (should print consecutively until 999), and different times of executions are got cut at different lines. 

root@xen-4.9.1: c #

------------ output end -----------------------

However, if I use sleep(1) after every printf, it could print all lines. 

Could anyone give any hints about what is happening here? And where need to be fixed to get all printings properly with printf?

Best,

Lele

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