Aksal/nuttx
3
1
Fork 1
mirror of https://github.com/apache/nuttx.git synced 2026-08-01 20:28:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

move readv/writev to the kernel

Browse source 
currently, nuttx implements readv/writev on the top of read/write.
while it might work for the simplest cases, it's broken by design.
for example, it's impossible to make it work correctly for files
which need to preserve data boundaries without allocating a single
contiguous buffer. (udp socket, some character devices, etc)

this change is a start of the migration to a better design.
that is, implement read/write on the top of readv/writev.

to avoid a single huge change, following things will NOT be done in
this commit:

* fix actual bugs caused by the original readv-based-on-read design.
  (cf. https://github.com/apache/nuttx/pull/12674)

* adapt filesystems/drivers to actually benefit from the new interface.
  (except a few trivial examples)

* eventually retire the old interface.

* retire read/write syscalls. implement them in libc instead.

* pread/pwrite/preadv/pwritev (except the introduction of struct uio,
  which is a preparation to back these variations with the new
  interface.)
This commit is contained in:
YAMAMOTO Takashi 2024-09-17 15:23:07 +09:00 • committed by Xiang Xiao
parent e3d7d23618
commit 761ee81956
68 changed files with 836 additions and 452 deletions
Download patch file Download diff file Expand all files Collapse all files

2
syscall/syscall.csv
View file

@ -128,6 +128,7 @@
"putenv","stdlib.h","!defined(CONFIG_DISABLE_ENVIRON)","int","FAR const char *"
"pwrite","unistd.h","","ssize_t","int","FAR const void *","size_t","off_t"
"read","unistd.h","","ssize_t","int","FAR void *","size_t"
"readv","sys/uio.h","","ssize_t","int","FAR const struct iovec *","int"
"readlink","unistd.h","defined(CONFIG_PSEUDOFS_SOFTLINKS)","ssize_t","FAR const char *","FAR char *","size_t"
"recv","sys/socket.h","defined(CONFIG_NET)","ssize_t","int","FAR void *","size_t","int"
"recvfrom","sys/socket.h","defined(CONFIG_NET)","ssize_t","int","FAR void*","size_t","int","FAR struct sockaddr*","FAR socklen_t*"
@ -208,3 +209,4 @@
"waitid","sys/wait.h","defined(CONFIG_SCHED_WAITPID) && defined(CONFIG_SCHED_HAVE_PARENT)","int","idtype_t","id_t"," FAR siginfo_t *","int"
"waitpid","sys/wait.h","defined(CONFIG_SCHED_WAITPID)","pid_t","pid_t","FAR int *","int"
"write","unistd.h","","ssize_t","int","FAR const void *","size_t"
"writev","sys/uio.h","","ssize_t","int","FAR const struct iovec *","int"

Can't render this file because it has a wrong number of fields in line 2.