os.File.Fd
standard libraryThe 512th most-called standard-library method by production calls. Called 1,904 times across 326 modules; 1,619 of those run outside tests and generated code.
0% in production calls vs 2026-W39 (1,612 → 1,619)
- prod calls
- 1,619
- non-test, non-generated
- all calls
- 1,904
- total callsites
- modules
- 326
- distinct callers
- in loop
- 7%
- of prod calls
- in tests
- 15%
- 285 calls
- resolved
- 100%
- to a known target
resolution mix
How each call resolves
How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →
- Concrete method100%A method on a value whose type is known exactly.
- Embedded method<1%Reached through an embedded type.
who calls this
Notable callers
Production calls into File.Fd from notable Go projects. Open one on the map to see what else it hammers.
- containerd 75 5%
- Kubernetes 36 2%
- etcd 28 2%
- Cilium 21 1%
- Tailscale 19 1%
where it's called
Callsites in the wild
12 representative callsites of 1,904, prioritizing in-loop and non-test usage. We link to source, never display it.
-
argoproj/argo-cd @v1.8.6
in loop - in loop
- in loop
-
moby/moby @v28.5.2+incompatible
in loop -
go.etcd.io/bbolt @v1.5.0
tests/dmflakey/loopback.go:47
in loop -
DNSCrypt/dnscrypt-proxy @v0.0.0-20260907210843-47ce24df6e86
in loop -
boltdb/bolt @v1.3.1
in loop - in loop
-
canopy-network/canopy @v0.1.29-0.20260925213558-8c2976334ef5
in loop - in loop
-
coder/coder @v0.27.3
in loop - in loop
top callers
The modules that reach for it
The modules that call File.Fd most in this snapshot.
- github.com/google/gvisor885%
- github.com/u-root/u-root824%
- github.com/opencontainers/runc734%
- github.com/siderolabs/talos483%
- github.com/containerd/containerd/v2442%
siblings
More from os
The other most-called members in this package. See all →