File Descriptor Limits

• glibc

  45 1,213 9.8 C

  Unofficial mirror of sourceware glibc repository. Updated daily. (by bminor)

  

If you read the man page bugs section: https://man7.org/linux/man-pages/man2/select.2.html

"The Linux kernel imposes no fixed limit, but the glibc implementation makes fd_set a fixed-size type, with FD_SETSIZE defined as 1024"

Everyone using select, with very few exceptions, is using glibc.

That limitation does appear to exist in glibc if you look at the source code. The source code requires you to pass a glibc defined 'fd_set' type https://man7.org/linux/man-pages/man2/select.2.html

That struct is defined here: https://github.com/bminor/glibc/blob/595c22ecd8e87a27fd19270...

It does seem to have the limits described by the blogpost.

• cqueues

  2 236 0.0 C

  Continuation Queues: Embeddable asynchronous networking, threading, and notification framework for Lua on Unix.

At this point I believe ppoll has been added to every mainstream Unix except macOS.

For many years pselect on macOS didn't actually fix the race condition, notwithstanding its UNIX03 certification. pselect was just a naive wrapper around select that didn't atomically block signals. So I ended up having to create a kqueue-based implementation for use on macOS and stragglers like OpenBSD which at that time lacked pselect entirely. See https://github.com/wahern/cqueues/blob/87f14f9/src/cqueues.c... I can't remember if pselect has been fixed on macOS.

• InfluxDB

  www.influxdata.com featured

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• libkqueue

  1 233 5.9 C

  kqueue(2) compatibility library

• wepoll

  1 872 0.0 C

  wepoll: fast epoll for windows⁧ 🎭

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