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ui/input-linux: Do not ignore ioctl() return value 

Fix warnings reported by Clang static code analyzer:

    CC      ui/input-linux.o
      ui/input-linux.c:343:9: warning: Value stored to 'rc' is never read
          rc = ioctl(il->fd, EVIOCGBIT(EV_REL, sizeof(relmap)), &relmap);
          ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      ui/input-linux.c:351:9: warning: Value stored to 'rc' is never read
          rc = ioctl(il->fd, EVIOCGBIT(EV_ABS, sizeof(absmap)), &absmap);
          ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      ui/input-linux.c:354:13: warning: Value stored to 'rc' is never read
              rc = ioctl(il->fd, EVIOCGABS(ABS_X), &absinfo);
              ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      ui/input-linux.c:357:13: warning: Value stored to 'rc' is never read
              rc = ioctl(il->fd, EVIOCGABS(ABS_Y), &absinfo);
              ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      ui/input-linux.c:365:9: warning: Value stored to 'rc' is never read
          rc = ioctl(il->fd, EVIOCGBIT(EV_KEY, sizeof(keymap)), keymap);
          ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      ui/input-linux.c:366:9: warning: Value stored to 'rc' is never read
          rc = ioctl(il->fd, EVIOCGKEY(sizeof(keystate)), keystate);
          ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported-by: Clang Static Analyzer
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-id: 20200322161219.17757-1-philmd@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-03-22 17:12:19 +01:00 committed by Gerd Hoffmann
parent 736cf607e4
commit 112c37a6a6
1 changed files with 27 additions and 2 deletions
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29
ui/input-linux.c
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@ -334,13 +334,15 @@ static void input_linux_complete(UserCreatable *uc, Error **errp)
rc = ioctl(il->fd, EVIOCGBIT(0, sizeof(evtmap)), &evtmap);
if (rc < 0) {
error_setg(errp, "%s: failed to read event bits", il->evdev);
goto err_close;
goto err_read_event_bits;
}
if (evtmap & (1 << EV_REL)) {
relmap = 0;
rc = ioctl(il->fd, EVIOCGBIT(EV_REL, sizeof(relmap)), &relmap);
if (rc < 0) {
goto err_read_event_bits;
}
if (relmap & (1 << REL_X)) {
il->has_rel_x = true;
}
@ -349,12 +351,25 @@ static void input_linux_complete(UserCreatable *uc, Error **errp)
if (evtmap & (1 << EV_ABS)) {
absmap = 0;
rc = ioctl(il->fd, EVIOCGBIT(EV_ABS, sizeof(absmap)), &absmap);
if (rc < 0) {
goto err_read_event_bits;
}
if (absmap & (1 << ABS_X)) {
il->has_abs_x = true;
rc = ioctl(il->fd, EVIOCGABS(ABS_X), &absinfo);
if (rc < 0) {
error_setg(errp, "%s: failed to get get absolute X value",
il->evdev);
goto err_close;
}
il->abs_x_min = absinfo.minimum;
il->abs_x_max = absinfo.maximum;
rc = ioctl(il->fd, EVIOCGABS(ABS_Y), &absinfo);
if (rc < 0) {
error_setg(errp, "%s: failed to get get absolute Y value",
il->evdev);
goto err_close;
}
il->abs_y_min = absinfo.minimum;
il->abs_y_max = absinfo.maximum;
}
@ -363,7 +378,14 @@ static void input_linux_complete(UserCreatable *uc, Error **errp)
if (evtmap & (1 << EV_KEY)) {
memset(keymap, 0, sizeof(keymap));
rc = ioctl(il->fd, EVIOCGBIT(EV_KEY, sizeof(keymap)), keymap);
if (rc < 0) {
goto err_read_event_bits;
}
rc = ioctl(il->fd, EVIOCGKEY(sizeof(keystate)), keystate);
if (rc < 0) {
error_setg(errp, "%s: failed to get global key state", il->evdev);
goto err_close;
}
for (i = 0; i < KEY_CNT; i++) {
if (keymap[i / 8] & (1 << (i % 8))) {
if (linux_is_button(i)) {
@ -390,6 +412,9 @@ static void input_linux_complete(UserCreatable *uc, Error **errp)
il->initialized = true;
return;
err_read_event_bits:
error_setg(errp, "%s: failed to read event bits", il->evdev);
err_close:
close(il->fd);
return;