man/io_uring_enter.2: update notes about direct open/accept
Reflect recent changes in the man, i.e. direct open/accept now would try
to remove a file from the fixed file table if the slot they target is
already taken.
Link:
@@ -517,10 +517,12 @@ field is set to a positive number, the file won't be installed into the
normal file table as usual but will be placed into the fixed file table at index
.I file_index - 1.
In this case, instead of returning a file descriptor, the result will contain
-either 0 on success or an error. If there is already a file registered at this
-index, the request will fail with
-.B -EBADF.
-Only io_uring has access to such files and no other syscall can use them. See
+either 0 on success or an error. If the index points to a valid empty slot, the
+installation is guaranteed to not fail. If there is already a file in the slot,
+it will be replaced, similar to
+.B IORING_OP_FILES_UPDATE.
+Please note that only io_uring has access to such files and no other syscall
+can use them. See
.B IOSQE_FIXED_FILE
and
.B IORING_REGISTER_FILES.
@@ -656,10 +658,12 @@ field is set to a positive number, the file won't be installed into the
normal file table as usual but will be placed into the fixed file table at index
.I file_index - 1.
In this case, instead of returning a file descriptor, the result will contain
-either 0 on success or an error. If there is already a file registered at this
-index, the request will fail with
-.B -EBADF.
-Only io_uring has access to such files and no other syscall can use them. See
+either 0 on success or an error. If the index points to a valid empty slot, the
+installation is guaranteed to not fail. If there is already a file in the slot,
+it will be replaced, similar to
+.B IORING_OP_FILES_UPDATE.
+Please note that only io_uring has access to such files and no other syscall
+can use them. See
.B IOSQE_FIXED_FILE
and
.B IORING_REGISTER_FILES.
@@ -692,10 +696,12 @@ field is set to a positive number, the file won't be installed into the
normal file table as usual but will be placed into the fixed file table at index
.I file_index - 1.
In this case, instead of returning a file descriptor, the result will contain
-either 0 on success or an error. If there is already a file registered at this
-index, the request will fail with
-.B -EBADF.
-Only io_uring has access to such files and no other syscall can use them. See
+either 0 on success or an error. If the index points to a valid empty slot, the
+installation is guaranteed to not fail. If there is already a file in the slot,
+it will be replaced, similar to
+.B IORING_OP_FILES_UPDATE.
+Please note that only io_uring has access to such files and no other syscall
+can use them. See
.B IOSQE_FIXED_FILE
and
.B IORING_REGISTER_FILES.
