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Enable exclusive access mode.

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With exclusive access mode, no further open() operations on the terminal
are permitted, except for a process with root priviliges. Non-root
processes will fail with EBUSY. This change will prevent other processes
from accidentally messing up the communication. It also makes the
behaviour similar to Windows, where serial ports are always opened with
exclusive access.
This commit is contained in:
Jef Driesen 2011-02-15 21:40:24 +01:00
parent cd31ff9dff
commit 6cb4bc6a06
1 changed files with 8 additions and 0 deletions
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8
src/serial_posix.c
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@ -103,6 +103,14 @@ serial_open (serial_t **out, dc_context_t *context, const char* name)
return -1; // Error during open call.
}
// Enable exclusive access mode.
if (ioctl (device->fd, TIOCEXCL, NULL) != 0) {
SYSERROR (context, errno);
close (device->fd);
free (device);
return -1;
}
// Retrieve the current terminal attributes, to
// be able to restore them when closing the device.
// It is also used to check if the obtained