Operator new and bad_alloc on linux

On Linux, malloc doesn't necessarily return a null pointer if you're out of memory. You might get back a pointer and then have the OOM ki开发者_开发问答ller start eating processes if you're really out of memory. Is the same true for c++'s operator new or will you get the bad_alloc exception?

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It's a kernel function rather than a language function - and you can control it with the vm.overcommit_memory and vm.overcommit_ratio sysctls.

They're visible in the proc filesystem at /proc/sys/vm/overcommit_memory and /proc/sys/vm/overcommit_ratio.

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The same is true for operator new, alas :^(