Lib.rs

› Operating systems › Unix APIs › Deno
#deno #os-api #unix #host-name #family #system-information #syscalls #os-kernel #loadavg #mem-info

deno_os

OS specific APIs for Deno

by Bartek Iwańczuk, David Sherret, denobot and 96 contributors

53 breaking releases

Uses new Rust 2024

new 0.54.0 Mar 5, 2026
0.52.0 Mar 3, 2026
0.42.0 Dec 20, 2025
0.38.0 Oct 30, 2025
0.14.0 Mar 28, 2025

#383 in Unix APIs

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7,267 downloads per month
Used in 15 crates (3 directly)

MIT license

2MB
51K SLoC

deno_os

This crate implements OS specific APIs for Deno

loadavg

Target family Syscall Description
Linux sysinfo -
Windows - Returns DEFAULT_LOADAVG. There is no concept of loadavg on Windows
macOS, BSD getloadavg https://www.freebsd.org/cgi/man.cgi?query=getloadavg

os_release

Target family Syscall Description
Linux /proc/sys/kernel/osrelease -
Windows RtlGetVersion dwMajorVersion . dwMinorVersion . dwBuildNumber
macOS sysctl([CTL_KERN, KERN_OSRELEASE]) -

hostname

Target family Syscall Description
Unix gethostname(sysconf(_SC_HOST_NAME_MAX)) -
Windows GetHostNameW -

mem_info

Target family Syscall Description
Linux sysinfo and /proc/meminfo -
Windows sysinfoapi::GlobalMemoryStatusEx -
macOS 
 sysctl([CTL_HW, HW_MEMSIZE]); 
 sysctl([CTL_VM, VM_SWAPUSAGE]); 
 host_statistics64(mach_host_self(), HOST_VM_INFO64)
-

cpu_usage

Target family Syscall Description
Linux getrusage -
Windows processthreadsapi::GetProcessTimes -
macOS getrusage -

Dependencies

~107MB
~2M SLoC