fd = open(chrdev_name, 0);
if (fd == -1) {
ret = -errno;
- fprintf(stderr, "Failed to open %s\n", chrdev_name);
+ fprintf(stderr, "Failed to open %s, %s\n",
+ chrdev_name, strerror(errno));
goto exit_close_error;
}
ret = ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
if (ret == -1) {
ret = -errno;
- fprintf(stderr, "Failed to issue GET LINEHANDLE IOCTL (%d)\n",
- ret);
+ fprintf(stderr, "Failed to issue %s (%d), %s\n",
+ "GPIO_GET_LINEHANDLE_IOCTL", ret, strerror(errno));
}
exit_close_error:
ret = ioctl(fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, data);
if (ret == -1) {
ret = -errno;
- fprintf(stderr, "Failed to issue %s (%d)\n",
- "GPIOHANDLE_SET_LINE_VALUES_IOCTL", ret);
+ fprintf(stderr, "Failed to issue %s (%d), %s\n",
+ "GPIOHANDLE_SET_LINE_VALUES_IOCTL", ret,
+ strerror(errno));
}
return ret;
ret = ioctl(fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, data);
if (ret == -1) {
ret = -errno;
- fprintf(stderr, "Failed to issue %s (%d)\n",
- "GPIOHANDLE_GET_LINE_VALUES_IOCTL", ret);
+ fprintf(stderr, "Failed to issue %s (%d), %s\n",
+ "GPIOHANDLE_GET_LINE_VALUES_IOCTL", ret,
+ strerror(errno));
}
return ret;