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Ignore non-existant serial8250 ports on Linux.

This commit is contained in:
Martin Ling 2013-10-27 12:51:55 +00:00 committed by Uwe Hermann
parent 08fe0bdbdb
commit 4b97c9fc26
1 changed files with 20 additions and 0 deletions
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20
serialport.c
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@ -39,6 +39,7 @@
#endif
#ifdef __linux__
#include "libudev.h"
#include "linux/serial.h"
#endif
#include "serialport.h"
@ -178,6 +179,9 @@ out_release:
const char *path;
struct udev_device *ud_dev, *ud_parent;
const char *name;
const char *driver;
int fd, ioctl_result;
struct serial_struct serial_info;
ud = udev_new();
ud_enumerate = udev_enumerate_new(ud);
@ -198,7 +202,23 @@ out_release:
continue;
}
name = udev_device_get_devnode(ud_dev);
/* The serial8250 driver has a hardcoded number of ports.
* The only way to tell which actually exist on a given system
* is to try to open them and make an ioctl call. */
driver = udev_device_get_driver(ud_parent);
if (driver && !strcmp(driver, "serial8250"))
{
if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0)
goto skip;
ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
close(fd);
if (ioctl_result != 0)
goto skip;
if (serial_info.type == PORT_UNKNOWN)
goto skip;
}
list = sp_list_append(list, (void *)name, strlen(name) + 1);
skip:
udev_device_unref(ud_dev);
if (!list)
goto out;