tools/usb/usbip/src/usbip_detach.c

Source file repositories/reference/linux-study-clean/tools/usb/usbip/src/usbip_detach.c

File Facts

System
Linux kernel
Corpus path
tools/usb/usbip/src/usbip_detach.c
Extension
.c
Size
2354 bytes
Lines
126
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!isdigit(port[i])) {
			err("invalid port %s", port);
			return -1;
		}

	portnum = atoi(port);

	ret = usbip_vhci_driver_open();
	if (ret < 0) {
		err("open vhci_driver (is vhci_hcd loaded?)");
		return -1;
	}

	/* check for invalid port */
	for (i = 0; i < vhci_driver->nports; i++) {
		idev = &vhci_driver->idev[i];

		if (idev->port == portnum) {
			found = 1;
			if (idev->status != VDEV_ST_NULL)
				break;
			info("Port %d is already detached!\n", idev->port);
			goto call_driver_close;
		}
	}

	if (!found) {
		ret = -1;
		err("Invalid port %s > maxports %d",
			port, vhci_driver->nports);
		goto call_driver_close;
	}

	/* remove the port state file */
	snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", portnum);

	remove(path);
	rmdir(VHCI_STATE_PATH);

	ret = usbip_vhci_detach_device(portnum);
	if (ret < 0) {
		ret = -1;
		err("Port %d detach request failed!\n", portnum);
		goto call_driver_close;
	}
	info("Port %d is now detached!\n", portnum);

call_driver_close:
	usbip_vhci_driver_close();

	return ret;
}

int usbip_detach(int argc, char *argv[])
{
	static const struct option opts[] = {
		{ "port", required_argument, NULL, 'p' },
		{ NULL, 0, NULL, 0 }
	};
	int opt;
	int ret = -1;

	for (;;) {
		opt = getopt_long(argc, argv, "p:", opts, NULL);

		if (opt == -1)
			break;

		switch (opt) {
		case 'p':
			ret = detach_port(optarg);
			goto out;
		default:
			goto err_out;
		}
	}

err_out:
	usbip_detach_usage();
out:
	return ret;
}

Annotation

Implementation Notes