emomaxd commented on PR #19501:
URL: https://github.com/apache/nuttx/pull/19501#issuecomment-5042956181

   These implementations are unconditional stubs and do not inspect request. 
POSIX describes ENOSYS as indicating that the interface function is not 
supported at all, whereas NuttX documents ENOTTY for an ioctl() command that is 
not recognized. Since host_ioctl() is entirely unimplemented on these backends, 
wouldn’t -ENOSYS be more accurate here?
   
   https://nuttx.apache.org/docs/latest/implementation/ioctl.html
   https://pubs.opengroup.org/onlinepubs/009696899/xrat/xsh_chap02.html
   https://pubs.opengroup.org/onlinepubs/9699919799.orig/basedefs/errno.h.html


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