24 	struct tty_audit_buf *buf;  in tty_audit_buf_ref()  local
26 	buf = current->signal->tty_audit_buf;  in tty_audit_buf_ref()
27 	WARN_ON(buf == ERR_PTR(-ESRCH));  in tty_audit_buf_ref()
28 	return buf;  in tty_audit_buf_ref()
33 	struct tty_audit_buf *buf;  in tty_audit_buf_alloc()  local
35 	buf = kmalloc(sizeof(*buf), GFP_KERNEL);  in tty_audit_buf_alloc()
36 	if (!buf)  in tty_audit_buf_alloc()
38 	buf->data = kmalloc(N_TTY_BUF_SIZE, GFP_KERNEL);  in tty_audit_buf_alloc()
39 	if (!buf->data)  in tty_audit_buf_alloc()
41 	mutex_init(&buf->mutex);  in tty_audit_buf_alloc()
42 	buf->dev = MKDEV(0, 0);  in tty_audit_buf_alloc()
43 	buf->icanon = 0;  in tty_audit_buf_alloc()
44 	buf->valid = 0;  in tty_audit_buf_alloc()
45 	return buf;  in tty_audit_buf_alloc()
48 	kfree(buf);  in tty_audit_buf_alloc()
53 static void tty_audit_buf_free(struct tty_audit_buf *buf)  in tty_audit_buf_free()  argument
55 	WARN_ON(buf->valid != 0);  in tty_audit_buf_free()
56 	kfree(buf->data);  in tty_audit_buf_free()
57 	kfree(buf);  in tty_audit_buf_free()
90 static void tty_audit_buf_push(struct tty_audit_buf *buf)  in tty_audit_buf_push()  argument
92 	if (buf->valid == 0)  in tty_audit_buf_push()
95 		buf->valid = 0;  in tty_audit_buf_push()
98 	tty_audit_log("tty", buf->dev, buf->data, buf->valid);  in tty_audit_buf_push()
99 	buf->valid = 0;  in tty_audit_buf_push()
113 	struct tty_audit_buf *buf;  in tty_audit_exit()  local
115 	buf = xchg(&current->signal->tty_audit_buf, ERR_PTR(-ESRCH));  in tty_audit_exit()
116 	if (!buf)  in tty_audit_exit()
119 	tty_audit_buf_push(buf);  in tty_audit_exit()
120 	tty_audit_buf_free(buf);  in tty_audit_exit()
155 	struct tty_audit_buf *buf;  in tty_audit_push()  local
160 	buf = tty_audit_buf_ref();  in tty_audit_push()
161 	if (!IS_ERR_OR_NULL(buf)) {  in tty_audit_push()
162 		mutex_lock(&buf->mutex);  in tty_audit_push()
163 		tty_audit_buf_push(buf);  in tty_audit_push()
164 		mutex_unlock(&buf->mutex);  in tty_audit_push()
178 	struct tty_audit_buf *buf;  in tty_audit_buf_get()  local
180 	buf = tty_audit_buf_ref();  in tty_audit_buf_get()
181 	if (buf)  in tty_audit_buf_get()
182 		return buf;  in tty_audit_buf_get()
184 	buf = tty_audit_buf_alloc();  in tty_audit_buf_get()
185 	if (buf == NULL) {  in tty_audit_buf_get()
191 	if (cmpxchg(&current->signal->tty_audit_buf, NULL, buf) != NULL)  in tty_audit_buf_get()
192 		tty_audit_buf_free(buf);  in tty_audit_buf_get()
203 	struct tty_audit_buf *buf;  in tty_audit_add_data()  local
222 	buf = tty_audit_buf_get();  in tty_audit_add_data()
223 	if (IS_ERR_OR_NULL(buf))  in tty_audit_add_data()
226 	mutex_lock(&buf->mutex);  in tty_audit_add_data()
228 	if (buf->dev != dev || buf->icanon != icanon) {  in tty_audit_add_data()
229 		tty_audit_buf_push(buf);  in tty_audit_add_data()
230 		buf->dev = dev;  in tty_audit_add_data()
231 		buf->icanon = icanon;  in tty_audit_add_data()
236 		run = N_TTY_BUF_SIZE - buf->valid;  in tty_audit_add_data()
239 		memcpy(buf->data + buf->valid, data, run);  in tty_audit_add_data()
240 		buf->valid += run;  in tty_audit_add_data()
243 		if (buf->valid == N_TTY_BUF_SIZE)  in tty_audit_add_data()
244 			tty_audit_buf_push(buf);  in tty_audit_add_data()
246 	mutex_unlock(&buf->mutex);  in tty_audit_add_data()