diff options
| -rw-r--r-- | evtest.c | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -598,6 +598,23 @@ static int print_events(int fd) } } +/** + * Grab and immediately ungrab the device. + * + * Returns 0 if the grab was successful, or 1 otherwise. + */ +static int test_grab(int fd) +{ + int rc; + + rc = ioctl(fd, EVIOCGRAB, (void*)1); + + if (!rc) + ioctl(fd, EVIOCGRAB, (void*)0); + + return rc; +} + int main (int argc, char **argv) { int fd; @@ -620,5 +637,17 @@ int main (int argc, char **argv) printf("Testing ... (interrupt to exit)\n"); + if (test_grab(fd)) + { + printf("***********************************************\n"); + printf(" This device is grabbed by another process.\n"); + printf(" No events are available to evtest while the\n" + " other grab is active.\n"); + printf(" In most cases, this is caused by an X driver,\n" + " try VT-switching and re-run evtest again.\n"); + printf("***********************************************\n"); + } + + return print_events(fd); } |