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devpts: factor out PTY index allocation

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Factor out the code used to allocate/free a pts index into new interfaces,
devpts_new_index() and devpts_kill_index().  This localizes the external data
structures used in managing the pts indices.

[[email protected]: undo accidental mutex2sem conversion]
Signed-off-by: Sukadev Bhattiprolu <[email protected]>
Signed-off-by: Serge Hallyn <[email protected]>
Signed-off-by: Matt Helsley <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Sukadev Bhattiprolu 2008-04-30 00:54:21 -07:00 • committed by Linus Torvalds
commit 718a916338
3 changed files with 52 additions and 35 deletions
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4
include/linux/devpts_fs.h
View file

@ -17,6 +17,8 @@
#ifdef CONFIG_UNIX98_PTYS
int devpts_new_index(void);
void devpts_kill_index(int idx);
int devpts_pty_new(struct tty_struct *tty); /* mknod in devpts */
struct tty_struct *devpts_get_tty(int number); /* get tty structure */
void devpts_pty_kill(int number); /* unlink */
@ -24,6 +26,8 @@ void devpts_pty_kill(int number); /* unlink */
#else
/* Dummy stubs in the no-pty case */
static inline int devpts_new_index(void) { return -EINVAL; }
static inline void devpts_kill_index(int idx) { }
static inline int devpts_pty_new(struct tty_struct *tty) { return -EINVAL; }
static inline struct tty_struct *devpts_get_tty(int number) { return NULL; }
static inline void devpts_pty_kill(int number) { }