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Diffstat (limited to 'include/linux/tty_ldisc.h')
-rw-r--r--include/linux/tty_ldisc.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index 58390c73df8b..a1b048999821 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -100,6 +100,11 @@
* seek to perform this action quickly but should wait until
* any pending driver I/O is completed.
*
+ * void (*fasync)(struct tty_struct *, int on)
+ *
+ * Notify line discipline when signal-driven I/O is enabled or
+ * disabled.
+ *
* void (*dcd_change)(struct tty_struct *tty, unsigned int status)
*
* Tells the discipline that the DCD pin has changed its status.
@@ -110,6 +115,52 @@
#include <linux/wait.h>
#include <linux/wait.h>
+
+/*
+ * the semaphore definition
+ */
+struct ld_semaphore {
+ long count;
+ raw_spinlock_t wait_lock;
+ unsigned int wait_readers;
+ struct list_head read_wait;
+ struct list_head write_wait;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ struct lockdep_map dep_map;
+#endif
+};
+
+extern void __init_ldsem(struct ld_semaphore *sem, const char *name,
+ struct lock_class_key *key);
+
+#define init_ldsem(sem) \
+do { \
+ static struct lock_class_key __key; \
+ \
+ __init_ldsem((sem), #sem, &__key); \
+} while (0)
+
+
+extern int ldsem_down_read(struct ld_semaphore *sem, long timeout);
+extern int ldsem_down_read_trylock(struct ld_semaphore *sem);
+extern int ldsem_down_write(struct ld_semaphore *sem, long timeout);
+extern int ldsem_down_write_trylock(struct ld_semaphore *sem);
+extern void ldsem_up_read(struct ld_semaphore *sem);
+extern void ldsem_up_write(struct ld_semaphore *sem);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+extern int ldsem_down_read_nested(struct ld_semaphore *sem, int subclass,
+ long timeout);
+extern int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
+ long timeout);
+#else
+# define ldsem_down_read_nested(sem, subclass, timeout) \
+ ldsem_down_read(sem, timeout)
+# define ldsem_down_write_nested(sem, subclass, timeout) \
+ ldsem_down_write(sem, timeout)
+#endif
+
+
struct tty_ldisc_ops {
int magic;
char *name;
@@ -143,6 +194,7 @@ struct tty_ldisc_ops {
char *fp, int count);
void (*write_wakeup)(struct tty_struct *);
void (*dcd_change)(struct tty_struct *, unsigned int);
+ void (*fasync)(struct tty_struct *tty, int on);
struct module *owner;