github/acrn-hypervisor
1
0
Fork 0
mirror of https://github.com/projectacrn/acrn-hypervisor.git synced 2025-06-22 13:37:10 +00:00
Code Issues Projects Releases Wiki Activity

dm: uart: use mevent_add only when it is a tty

Browse Source 
When acrn-dm is started by acrnd as a background process, STDIN is
redirected to journal. In this case mevent_add cannot be called on
the fd of STDIN.

Tracked-On: #2998
Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Jian Jun Chen 2019-04-23 09:39:45 +08:00 committed by wenlingz
parent 49563b2a11
commit fb9bd2a19a
1 changed files with 27 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
devicemodel/hw/uart_core.c
View File

@ -790,11 +790,13 @@ uart_reset_backend(struct uart_backend *be)
break;
}
if (evp) {
error = mevent_enable(evp);
if (error) {
WPRINTF(("mevent_enable error\n"));
return -1;
}
}
return 0;
}
@ -821,6 +823,7 @@ uart_enable_backend(struct uart_backend *be, bool enable)
return -1;
}
if (evp) {
if (enable)
error = mevent_enable(evp);
else
@ -829,6 +832,7 @@ uart_enable_backend(struct uart_backend *be, bool enable)
WPRINTF(("mevent %s error\n", enable ? "enable" : "disable"));
return -1;
}
}
return 0;
}
@ -909,12 +913,19 @@ uart_config_backend(struct uart_vdev *uart, struct uart_backend *be, long port)
atexit(uart_reset_stdio);
}
be->opened = true;
/*
* When acrn-dm is started by acrnd as a background process,
* STDIO is redirected to journal log file. In this case epoll
* cannot be used on a regular file.
*/
if (isatty(fd)) {
be->evp = mevent_add(fd, EVF_READ, uart_drain, uart,
uart_mevent_teardown, uart);
if (!be->evp) {
WPRINTF(("uart: mevent_add failed\n"));
return -1;
}
}
break;
case UART_BE_SOCK:
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&opt,