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dmx: example code should set a good example 

Resolves warning from Oracle Parfait static analyser:

Error: Unchecked result
   Unchecked result [unchecked-result-call-X]:
      Unchecked return value from call to XOpenDisplay. Value display must be ch
ecked to ensure this function was successful.
        at line 73 of hw/dmx/examples/xbell.c in function 'main'.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
This commit is contained in:
Alan Coopersmith 2020-11-01 13:55:59 -08:00
parent d00594ebc7
commit 034e792662
1 changed files with 8 additions and 1 deletions
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9
hw/dmx/examples/xbell.c
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@ -70,7 +70,7 @@ pks(XKeyboardState * ks)
int
main(int argc, char **argv)
{
Display *display = XOpenDisplay(NULL);
Display *display;
XKeyboardControl kc;
XKeyboardState ks;
unsigned long vm;
@ -86,6 +86,13 @@ main(int argc, char **argv)
kc.bell_pitch = atoi(argv[3]);
kc.bell_duration = atoi(argv[4]);
display = XOpenDisplay(NULL);
if (display == NULL) {
fprintf (stderr, "%s: unable to open display \"%s\".\n",
argv[0], XDisplayName (NULL));
exit(1);
}
printf("Setting:\n");
pkc(&kc, vm);
XChangeKeyboardControl(display, vm, &kc);