---

10.461 ioctl

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/ioctl.html

LSB specification:

• https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-ioctl-2.html
• https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-ttyio-2.html
• https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-sockio-2.html

Gnulib module: ioctl

Portability problems fixed by Gnulib:

• On Windows platforms (excluding Cygwin), ioctl is called ioctlsocket, and error codes from this function are not placed in errno, and WSAGetLastError must be used instead.
• The second parameter is of type unsigned long rather than int on some platforms: glibc 2.26, macOS 11.1, FreeBSD 14.0, NetBSD 9.0, OpenBSD 6.7, Haiku 2017.

Portability problems not fixed by Gnulib:

• Most ioctl requests are platform and hardware specific.