PTYs aren’t free in the kernel. Each UNIX 98 pseudoterminal pair consumes non-swappable kernel memory, so Linux enforces a limit to protect system stability. On older kernels, this was controlled by CONFIG_UNIX98_PTYS, with a default of 256 PTYs. Lightweight in user space. Real cost in the kernel. #unix #linux #software #computerscience | Command & Code | Facebook
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