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DM: mevent_add/del refine for Linux

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Unlike kqueue/kevent of BSD, the epoll of Linux could be
add/del by using different API on the fly.

This patch drops the notify used by mevent_add/del and
call epoll_ctl to add/delete target fd. Only keeps
global_head to track mevent added and makes the code
logic in mevent_dispatch() a littel bit simpler.

Another thing is related with epoll_ctl. If the target
fd is regular fd which doesn't support epoll, epoll_ctl
will return -1. When DM is start by systemd, the STDIO
is not mapped to terminal, epoll_ctl on STDIO could
return -1. Which block UOS boot. We only call mevent_add
after confirm STDIO is mapped to terminal.

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Yin Fengwei
2018-04-10 17:26:39 +08:00
committed by Jack Ren
parent db46df940e
commit c6bf67543c
3 changed files with 54 additions and 137 deletions
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7
devicemodel/hw/platform/uart_core.c
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@@ -267,8 +267,11 @@ static void
uart_opentty(struct uart_vdev *uart)
{
ttyopen(&uart->tty);
uart->mev = mevent_add(uart->tty.fd, EVF_READ, uart_drain, uart);
assert(uart->mev != NULL);
if (isatty(uart->tty.fd)) {
uart->mev = mevent_add(uart->tty.fd, EVF_READ,
uart_drain, uart);
assert(uart->mev != NULL);
}
}
static uint8_t