209 lines
7.2 KiB
C
209 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TTY_PORT_H
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#define _LINUX_TTY_PORT_H
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/tty_buffer.h>
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#include <linux/wait.h>
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/*
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* Port level information. Each device keeps its own port level information
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* so provide a common structure for those ports wanting to use common support
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* routines.
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*
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* The tty port has a different lifetime to the tty so must be kept apart.
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* In addition be careful as tty -> port mappings are valid for the life
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* of the tty object but in many cases port -> tty mappings are valid only
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* until a hangup so don't use the wrong path.
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*/
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struct attribute_group;
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struct tty_driver;
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struct tty_port;
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struct tty_struct;
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struct tty_port_operations {
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/* Return 1 if the carrier is raised */
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int (*carrier_raised)(struct tty_port *port);
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/* Control the DTR line */
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void (*dtr_rts)(struct tty_port *port, int raise);
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/* Called when the last close completes or a hangup finishes
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IFF the port was initialized. Do not use to free resources. Called
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under the port mutex to serialize against activate/shutdowns */
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void (*shutdown)(struct tty_port *port);
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/* Called under the port mutex from tty_port_open, serialized using
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the port mutex */
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/* FIXME: long term getting the tty argument *out* of this would be
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good for consoles */
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int (*activate)(struct tty_port *port, struct tty_struct *tty);
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/* Called on the final put of a port */
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void (*destruct)(struct tty_port *port);
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};
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struct tty_port_client_operations {
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int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
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void (*write_wakeup)(struct tty_port *port);
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};
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extern const struct tty_port_client_operations tty_port_default_client_ops;
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struct tty_port {
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struct tty_bufhead buf; /* Locked internally */
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struct tty_struct *tty; /* Back pointer */
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struct tty_struct *itty; /* internal back ptr */
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const struct tty_port_operations *ops; /* Port operations */
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const struct tty_port_client_operations *client_ops; /* Port client operations */
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spinlock_t lock; /* Lock protecting tty field */
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int blocked_open; /* Waiting to open */
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int count; /* Usage count */
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wait_queue_head_t open_wait; /* Open waiters */
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wait_queue_head_t delta_msr_wait; /* Modem status change */
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unsigned long flags; /* User TTY flags ASYNC_ */
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unsigned long iflags; /* Internal flags TTY_PORT_ */
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unsigned char console:1; /* port is a console */
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struct mutex mutex; /* Locking */
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struct mutex buf_mutex; /* Buffer alloc lock */
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unsigned char *xmit_buf; /* Optional buffer */
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unsigned int close_delay; /* Close port delay */
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unsigned int closing_wait; /* Delay for output */
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int drain_delay; /* Set to zero if no pure time
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based drain is needed else
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set to size of fifo */
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struct kref kref; /* Ref counter */
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void *client_data;
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};
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/* tty_port::iflags bits -- use atomic bit ops */
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#define TTY_PORT_INITIALIZED 0 /* device is initialized */
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#define TTY_PORT_SUSPENDED 1 /* device is suspended */
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#define TTY_PORT_ACTIVE 2 /* device is open */
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/*
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* uart drivers: use the uart_port::status field and the UPSTAT_* defines
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* for s/w-based flow control steering and carrier detection status
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*/
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#define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */
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#define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */
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#define TTY_PORT_KOPENED 5 /* device exclusively opened by
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kernel */
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void tty_port_init(struct tty_port *port);
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void tty_port_link_device(struct tty_port *port, struct tty_driver *driver,
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unsigned index);
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struct device *tty_port_register_device(struct tty_port *port,
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struct tty_driver *driver, unsigned index,
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struct device *device);
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struct device *tty_port_register_device_attr(struct tty_port *port,
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struct tty_driver *driver, unsigned index,
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struct device *device, void *drvdata,
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const struct attribute_group **attr_grp);
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struct device *tty_port_register_device_serdev(struct tty_port *port,
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struct tty_driver *driver, unsigned index,
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struct device *device);
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struct device *tty_port_register_device_attr_serdev(struct tty_port *port,
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struct tty_driver *driver, unsigned index,
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struct device *device, void *drvdata,
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const struct attribute_group **attr_grp);
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void tty_port_unregister_device(struct tty_port *port,
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struct tty_driver *driver, unsigned index);
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int tty_port_alloc_xmit_buf(struct tty_port *port);
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void tty_port_free_xmit_buf(struct tty_port *port);
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void tty_port_destroy(struct tty_port *port);
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void tty_port_put(struct tty_port *port);
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static inline struct tty_port *tty_port_get(struct tty_port *port)
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{
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if (port && kref_get_unless_zero(&port->kref))
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return port;
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return NULL;
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}
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/* If the cts flow control is enabled, return true. */
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static inline bool tty_port_cts_enabled(const struct tty_port *port)
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{
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return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
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}
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static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
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{
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assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val);
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}
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static inline bool tty_port_active(const struct tty_port *port)
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{
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return test_bit(TTY_PORT_ACTIVE, &port->iflags);
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}
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static inline void tty_port_set_active(struct tty_port *port, bool val)
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{
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assign_bit(TTY_PORT_ACTIVE, &port->iflags, val);
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}
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static inline bool tty_port_check_carrier(const struct tty_port *port)
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{
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return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
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}
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static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
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{
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assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val);
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}
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static inline bool tty_port_suspended(const struct tty_port *port)
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{
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return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
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}
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static inline void tty_port_set_suspended(struct tty_port *port, bool val)
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{
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assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val);
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}
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static inline bool tty_port_initialized(const struct tty_port *port)
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{
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return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
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}
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static inline void tty_port_set_initialized(struct tty_port *port, bool val)
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{
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assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val);
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}
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static inline bool tty_port_kopened(const struct tty_port *port)
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{
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return test_bit(TTY_PORT_KOPENED, &port->iflags);
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}
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static inline void tty_port_set_kopened(struct tty_port *port, bool val)
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{
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assign_bit(TTY_PORT_KOPENED, &port->iflags, val);
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}
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struct tty_struct *tty_port_tty_get(struct tty_port *port);
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void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
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int tty_port_carrier_raised(struct tty_port *port);
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void tty_port_raise_dtr_rts(struct tty_port *port);
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void tty_port_lower_dtr_rts(struct tty_port *port);
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void tty_port_hangup(struct tty_port *port);
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void tty_port_tty_hangup(struct tty_port *port, bool check_clocal);
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void tty_port_tty_wakeup(struct tty_port *port);
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int tty_port_block_til_ready(struct tty_port *port, struct tty_struct *tty,
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struct file *filp);
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int tty_port_close_start(struct tty_port *port, struct tty_struct *tty,
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struct file *filp);
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void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
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void tty_port_close(struct tty_port *port, struct tty_struct *tty,
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struct file *filp);
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int tty_port_install(struct tty_port *port, struct tty_driver *driver,
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struct tty_struct *tty);
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int tty_port_open(struct tty_port *port, struct tty_struct *tty,
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struct file *filp);
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static inline int tty_port_users(struct tty_port *port)
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{
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return port->count + port->blocked_open;
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}
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#endif
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