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man/io_uring_enter.2: clarify io_uring_enter(2) return values

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With the recent change to ensure that submission side errors that
happen on behalf of an sqe are returned in the form of a cqe rather
than -1/errno from the system call, make sure that the man page
reflects that.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-05-01 15:54:29 -06:00
parent 60b330558f
commit ff73ac71a1
1 changed files with 6 additions and 4 deletions
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10
man/io_uring_enter.2
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@@ -305,13 +305,15 @@ description of the opcodes above.
.PP
.SH RETURN VALUE
.BR io_uring_enter ()
returns the number of I/Os successfully submitted. This can be zero
returns the number of I/Os successfully consumed. This can be zero
if
.I to_submit
was zero, if there were invalid entries in the submission queue, or if
the submission queue was empty.
was zero or if the submission queue was empty. The errors below that refer to
an error in a submission queue entry will be returned though a completion queue
entry, rather than through the system call itself.
On error, -1 is returned and
Errors that occur not on behalf of a submission queue entry are returned via the
system call directly. On such an error, -1 is returned and
.I errno
is set appropriately.
.PP