[v2,5/5] kernel/uevent: Add uevent03

This time we create a virtual input device, a mouse, and validate the result.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 runtest/uevent                      |   1 +
 testcases/kernel/uevents/.gitignore |   1 +
 testcases/kernel/uevents/Makefile   |   4 +
 testcases/kernel/uevents/uevent03.c | 240 ++++++++++++++++++++++++++++
 4 files changed, 246 insertions(+)
 create mode 100644 testcases/kernel/uevents/uevent03.c

Hi Cyril,
works nice, just minor thing and a question.

On Tue, 2019-08-20 at 17:18 +0200, Cyril Hrubis wrote:
> This time we create a virtual input device, a mouse, and validate the
> result.
> 
> Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
> ---
>  runtest/uevent                      |   1 +
>  testcases/kernel/uevents/.gitignore |   1 +
>  testcases/kernel/uevents/Makefile   |   4 +
>  testcases/kernel/uevents/uevent03.c | 240
> ++++++++++++++++++++++++++++
>  4 files changed, 246 insertions(+)
>  create mode 100644 testcases/kernel/uevents/uevent03.c
> 
> diff --git a/runtest/uevent b/runtest/uevent
> index 30b1114a4..0b59c8723 100644
> --- a/runtest/uevent
> +++ b/runtest/uevent
> @@ -1,2 +1,3 @@
>  uevent01 uevent01
>  uevent02 uevent02
> +uevent03 uevent03
> diff --git a/testcases/kernel/uevents/.gitignore
> b/testcases/kernel/uevents/.gitignore
> index 0afc95534..7818f7308 100644
> --- a/testcases/kernel/uevents/.gitignore
> +++ b/testcases/kernel/uevents/.gitignore
> @@ -1,2 +1,3 @@
>  uevent01
>  uevent02
> +uevent03
> diff --git a/testcases/kernel/uevents/Makefile
> b/testcases/kernel/uevents/Makefile
> index cba769739..d5ceb0719 100644
> --- a/testcases/kernel/uevents/Makefile
> +++ b/testcases/kernel/uevents/Makefile
> @@ -2,5 +2,9 @@
>  
>  top_srcdir			?= ../../..
>  
> +LTPLIBS = ltpuinput
> +
> +uevent03: LDLIBS += -lltpuinput
> +
>  include $(top_srcdir)/include/mk/testcases.mk
>  include $(top_srcdir)/include/mk/generic_leaf_target.mk
> diff --git a/testcases/kernel/uevents/uevent03.c
> b/testcases/kernel/uevents/uevent03.c
> new file mode 100644
> index 000000000..26790967c
> --- /dev/null
> +++ b/testcases/kernel/uevents/uevent03.c
> @@ -0,0 +1,240 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2019 Cyril Hrubis <chrubis@suse.cz>
> + */
> +
> +/*
> + * Very simple uevent netlink socket test.
> + *
> + * We fork a child that listens for a kernel events while parents
> creates and
> + * removes a virtual mouse which produces add and remove event for
> the device
> + * itself and for two event handlers called eventX and mouseY.
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <sys/wait.h>
> +#include <sys/sysmacros.h>
> +
> +#include <linux/uinput.h>
> +
> +#include "tst_test.h"
> +#include "tst_uinput.h"
> +#include "uevent.h"
> +
> +static int mouse_fd;
> +
> +static void create_uinput_mouse(void)
> +{
> +	mouse_fd = open_uinput();
> +	setup_mouse_events(mouse_fd);
> +	create_input_device(mouse_fd);
> +}
> +
> +static void destroy_uinput_mouse(void)
> +{
> +	destroy_input_device(mouse_fd);
> +}
> +
> +static void get_minor_major(char *device, char *minor, char *major,
> size_t buf_sizes)
> +{
> +	char path[1024];
> +	struct stat stbuf;
> +
> +	snprintf(path, sizeof(path), "/dev/input/%s", device);
> +
> +	SAFE_STAT(path, &stbuf);
> +
> +	snprintf(major, buf_sizes, "MAJOR=%i",
> major(stbuf.st_rdev));
> +	snprintf(minor, buf_sizes, "MINOR=%i",
> minor(stbuf.st_rdev));
> +}
> +
> +#define MINOR_MAJOR_SIZE 32
> +
> +static void verify_uevent(void)
> +{
> +	int pid, fd;
> +	char sysname[64];
> +	char add_msg[1024];
> +	char rem_msg[1024];
> +	char dev_path[1024];
> +	char add_msg_event1[1024];
> +	char rem_msg_event1[1024];
> +	char dev_path_event1[1024];
> +	char add_msg_event2[1024];
> +	char rem_msg_event2[1024];
> +	char dev_path_event2[1024];
> +	char dev_name1[1024];
> +	char dev_name2[1024];
> +
> +	char minor_event1[MINOR_MAJOR_SIZE];
> +	char minor_event2[MINOR_MAJOR_SIZE];
> +	char major_event1[MINOR_MAJOR_SIZE];
> +	char major_event2[MINOR_MAJOR_SIZE];
> +
> +	char *handlers, *handler1, *handler2;
> +
> +	struct uevent_desc add = {
> +		.msg = add_msg,
> +		.value_cnt = 7,
> +		.values = (const char*[]) {
> +			"ACTION=add",
> +			dev_path,
> +			"SUBSYSTEM=input",
> +			"NAME=\"virtual-device-ltp\"",
> +			"PROP=0",
> +			"EV=7",
> +			"REL=3",
> +		}
> +	};
> +
> +	struct uevent_desc add_event1 = {
> +		.msg = add_msg_event1,
> +		.value_cnt = 6,
> +		.values = (const char*[]) {
> +			"ACTION=add",
> +			"SUBSYSTEM=input",
> +			dev_name1,
> +			dev_path_event1,
> +			minor_event1,
> +			major_event1,
> +		}
> +	};
> +
> +	struct uevent_desc add_event2 = {
> +		.msg = add_msg_event2,
> +		.value_cnt = 6,
> +		.values = (const char*[]) {
> +			"ACTION=add",
> +			"SUBSYSTEM=input",
> +			dev_name2,
> +			dev_path_event2,
> +			minor_event2,
> +			major_event2,
> +		}
> +	};
> +
> +	struct uevent_desc rem_event1 = {
> +		.msg = rem_msg_event1,
> +		.value_cnt = 6,
> +		.values = (const char*[]) {
> +			"ACTION=remove",
> +			"SUBSYSTEM=input",
> +			dev_name1,
> +			dev_path_event1,
> +			minor_event1,
> +			major_event1,
> +		}
> +	};
> +
> +	struct uevent_desc rem_event2 = {
> +		.msg = rem_msg_event2,
> +		.value_cnt = 6,
> +		.values = (const char*[]) {
> +			"ACTION=remove",
> +			"SUBSYSTEM=input",
> +			dev_name2,
> +			dev_path_event2,
> +			minor_event2,
> +			major_event2,
> +		}
> +	};
> +
> +	struct uevent_desc rem = {
> +		.msg = rem_msg,
> +		.value_cnt = 7,
> +		.values = (const char*[]) {
> +			"ACTION=remove",
> +			dev_path,
> +			"SUBSYSTEM=input",
> +			"NAME=\"virtual-device-ltp\"",
> +			"PROP=0",
> +			"EV=7",
> +			"REL=3",
> +		}
> +	};
> +
> +	const struct uevent_desc *const uevents[] = {
> +		&add,
> +		&add_event1,
> +		&add_event2,
> +		&rem_event1,
> +		&rem_event2,
> +		&rem,
> +		NULL
> +	};
> +
> +	fd = open_uevent_netlink();
> +
> +	create_uinput_mouse();
> +
> +	SAFE_IOCTL(mouse_fd, UI_GET_SYSNAME(sizeof(sysname)),
> sysname);
> +	handlers = get_input_handlers();
> +
> +	handler1 = strtok(handlers, " ");
Not sure if it's possible that we will get none or only one handler?

> +	get_minor_major(handler1, minor_event1, major_event1,
> MINOR_MAJOR_SIZE);
> +
> +	handler2 = strtok(NULL, " ");
> +	get_minor_major(handler2, minor_event2, major_event2,
> MINOR_MAJOR_SIZE);
> +
> +	destroy_uinput_mouse();
> +
> +	tst_res(TINFO, "Sysname: %s", sysname);
> +	tst_res(TINFO, "Handlers: %s", handlers);
Because of strtok(), we do not see all handlers here.

> +
> +	snprintf(add_msg, sizeof(add_msg),
> +	         "add@/devices/virtual/input/%s", sysname);
> +
> +	snprintf(rem_msg, sizeof(rem_msg),
> +	         "remove@/devices/virtual/input/%s", sysname);
> +
> +	snprintf(dev_path, sizeof(dev_path),
> +	         "DEVPATH=/devices/virtual/input/%s", sysname);
> +
> +
> +	snprintf(add_msg_event1, sizeof(add_msg_event1),
> +	         "add@/devices/virtual/input/%s/%s", sysname,
> handler1);
> +
> +	snprintf(rem_msg_event1, sizeof(rem_msg_event1),
> +	         "remove@/devices/virtual/input/%s/%s", sysname,
> handler1);
> +
> +	snprintf(dev_path_event1, sizeof(dev_path_event1),
> +	         "DEVPATH=/devices/virtual/input/%s/%s", sysname,
> handler1);
> +
> +	snprintf(dev_name1, sizeof(dev_name1),
> +	         "DEVNAME=input/%s", handler1);
> +
> +
> +	snprintf(add_msg_event2, sizeof(add_msg_event2),
> +	         "add@/devices/virtual/input/%s/%s", sysname,
> handler2);
> +
> +	snprintf(rem_msg_event2, sizeof(rem_msg_event2),
> +	         "remove@/devices/virtual/input/%s/%s", sysname,
> handler2);
> +
> +	snprintf(dev_path_event2, sizeof(dev_path_event2),
> +	         "DEVPATH=/devices/virtual/input/%s/%s", sysname,
> handler2);
> +
> +	snprintf(dev_name2, sizeof(dev_name2),
> +	         "DEVNAME=input/%s", handler2);
> +
> +	free(handlers);
> +
> +	pid = SAFE_FORK();
> +	if (!pid)
> +		wait_for_uevents(fd, uevents);
> +
> +	SAFE_CLOSE(fd);
> +	wait_for_pid(pid);
> +}
> +
> +static struct tst_test test = {
> +	.test_all = verify_uevent,
> +	.forks_child = 1,
> +	.needs_tmpdir = 1,
> +	.needs_checkpoints = 1,
> +	.needs_drivers = (const char *const[]) {
> +		"uinput",
> +		NULL
> +	},
> +	.needs_root = 1,
> +};
> -- 
> 2.21.0
> 
>

Hi!
> > +	handler1 = strtok(handlers, " ");
> Not sure if it's possible that we will get none or only one handler?

Well that would be a bug. As far as I can tell we have to get eventX
handler and mouseY handler for each device that looks like a mouse.

I guess that checking the content of handler1 and handler2 wouldn't harm
though.

> > +	get_minor_major(handler1, minor_event1, major_event1,
> > MINOR_MAJOR_SIZE);
> > +
> > +	handler2 = strtok(NULL, " ");
> > +	get_minor_major(handler2, minor_event2, major_event2,
> > MINOR_MAJOR_SIZE);
> > +
> > +	destroy_uinput_mouse();
> > +
> > +	tst_res(TINFO, "Sysname: %s", sysname);
> > +	tst_res(TINFO, "Handlers: %s", handlers);
> Because of strtok(), we do not see all handlers here.

Ah my bad, we have to move that before the strtok() call.