[luke0016]

> 1. printf may malloc so don't use it in an out of memory situation. Though I think this problem is vanishingly unlikely these days.

You can avoid this by doing something like:

  setvbuf(stdout, NULL, _IONBF, 0);

[saagarjha]

You sure about that? This seems to suggest otherwise: https://sourceware.org/git/?p=glibc.git;a=blob;f=stdio-commo...

[crististm]

It will allocate a buffer on the stack:

https://sourceware.org/git/?p=glibc.git;a=blob;f=stdio-commo...