When calling msgrcv with MSG_COPY flag on 3.8 or new kernel, it will report EINVAL error even we have disabled CONFIG_CHECKPOINT_RESTORE. It also needs to specify IPC_NOWAIT flag. Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx> --- man2/msgop.2 | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/man2/msgop.2 b/man2/msgop.2 index 373e53aa7..e559097a7 100644 --- a/man2/msgop.2 +++ b/man2/msgop.2 @@ -467,7 +467,9 @@ and the queue contains less than messages. .TP .BR ENOSYS " (since Linux 3.8)" -.I MSG_COPY +.B IPC_NOWAIT +and +.B MSG_COPY was specified in .IR msgflg , and this kernel was configured without -- 2.23.0
