diff options
author | Gregory Nutt <gnutt@nuttx.org> | 2014-11-29 10:53:22 -0600 |
---|---|---|
committer | Gregory Nutt <gnutt@nuttx.org> | 2014-11-29 10:53:22 -0600 |
commit | 6fa66b5a77300b73f40dbaae2bb831d92eaa8fe6 (patch) | |
tree | 64046c058f5f6e86d9f59dee44f9b6faba15d4cf /nuttx/TODO | |
parent | 7773304d911066ca3345eb295a944d949fd220c4 (diff) | |
download | px4-nuttx-6fa66b5a77300b73f40dbaae2bb831d92eaa8fe6.tar.gz px4-nuttx-6fa66b5a77300b73f40dbaae2bb831d92eaa8fe6.tar.bz2 px4-nuttx-6fa66b5a77300b73f40dbaae2bb831d92eaa8fe6.zip |
Add support for a variadic ioctl() function. The ioctl() interface is a non-standard, Unix interface. NuttX has always used the older, three-parameter version. Most contemporary systems now, however, use a variadic form of the ioctl() function. Added an option to insert a shim layer to adapt the three-parameter ioctl() to use the variadic interface form. Internally, the ioctl handling is the same three-parameter logic. The only real complexity to the shim is in how the system calls must be handled.
Diffstat (limited to 'nuttx/TODO')
-rw-r--r-- | nuttx/TODO | 42 |
1 files changed, 2 insertions, 40 deletions
diff --git a/nuttx/TODO b/nuttx/TODO index 56f555da3..8ec8533ef 100644 --- a/nuttx/TODO +++ b/nuttx/TODO @@ -1,4 +1,4 @@ -NuttX TODO List (Last updated November 27, 2014) +NuttX TODO List (Last updated November 29, 2014) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This file summarizes known NuttX bugs, limitations, inconsistencies with @@ -18,7 +18,7 @@ nuttx/ (13) Network (net/, drivers/net) (4) USB (drivers/usbdev, drivers/usbhost) (10) Libraries (libc/, ) - (12) File system/Generic drivers (fs/, drivers/) + (11) File system/Generic drivers (fs/, drivers/) (8) Graphics subystem (graphics/) (1) Pascal add-on (pcode/) (1) Documentation (Documentation/) @@ -1172,44 +1172,6 @@ o File system / Generic drivers (fs/, drivers/) Status: Open Priority: Medium - Title: IOCTL() IS NO LONGER STANDARD - Description: The function prototype for ioctl() is no longer standard. It - was more-or-less standard at one time. The NuttX ioctl is the - historic System 7 Unix, three-parameter version. - - int ioctl(int fd, int req, unsigned long arg); - - Current definitions now allow for the third parameter to be - optional (and, I suppose, could accept additional arguments). - For example, OpenGroup - (http://pubs.opengroup.org/onlinepubs/009695399/functions/ioctl.html): - - int ioctl(int fildes, int request, ... /* arg */); - - Linux man page: - - int ioctl(int d, unsigned long request, ...); - - FreeBSD: - - int ioctl(int fd, unsigned long request, ...); - - I imagine that making the thread argument variadic, the logic - is rescued for the case with modern 64-bit computers where - sizeof(long) < sizeof(pointer). - - Since NuttX relies on OpenGroup for interface definitions, the - current NuttX definition is incompatible with the standard in - any event. - - Unfortunately, the change would be very extensive. If the - type of the argument depends on the 'request', then the third - argument would have to be decoded by every device device - driver. That would be an enormous job and will not happen soon. - Status: Open - Priority: Very low until I run into a machine with sizeof(long) < - sizeof(pointer) - o Graphics subsystem (graphics/) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |