How do I get amount of queued data for UDP socket?

by

FWIW, I did some experiments to map out the behavior of FIONREAD on different platforms.

Platforms where FIONREAD returns all the data pending in a SOCK_DGRAM socket:

Mac OS X, NetBSD, FreeBSD, Solaris, HP-UX, AIX, Windows

Platforms where FIONREAD returns only the bytes for the first pending datagram:

Linux

It might also be worth noting that some implementations include headers or other overhead bytes in the count, while others only count the payload bytes. Linux appears to return the payload size, not including IP headers.

More Related Contents:

  1. Specifying UDP receive buffer size at runtime in Linux
  2. How do SO_REUSEADDR and SO_REUSEPORT differ?
  3. What is the meaning of SO_REUSEADDR (setsockopt option) – Linux? [duplicate]
  4. How many socket connections possible?
  5. Get destination address of a received UDP packet
  6. Can I open a socket and pass it to another process in Linux
  7. IPC performance: Named Pipe vs Socket
  8. Linux and I/O completion ports?
  9. UDP-Broadcast on all interfaces
  10. How to find the socket buffer size of linux
  11. How to handle OpenSSL SSL_ERROR_WANT_READ / WANT_WRITE on non-blocking sockets
  12. How to monitor Linux UDP buffer available space?
  13. Problems with SO_BINDTODEVICE Linux socket option
  14. ICMP sockets (linux)
  15. Simple Socket Server in Bash?
  16. When should I use TCP_NODELAY and when TCP_CORK?
  17. Will read() ever block after select()?
  18. How do I remove a CLOSE_WAIT socket connection
  19. Maximum number of concurrent connections on a single port (socket) of Server
  20. Sending UDP packets from the Linux Kernel
  21. Is there a way for non-root processes to bind to “privileged” ports on Linux?
  22. Are there any standard exit status codes in Linux?
  23. Is it possible to use “/” in a filename?
  24. How to start Solr automatically?
  25. How to search and replace using grep
  26. What is the proper way to use inotify?
  27. kernel symbol marked with “T” in /proc/kallsyms is not exported
  28. Replace whitespace with a comma in a text file in Linux
  29. I need a list of Async-Signal-Safe Functions from glibc
  30. Using “$RANDOM” to generate a random string in Bash

Leave a Comment