forked from rubenslte/android_kernel_samsung_msm8226
Alex Wong
7cf76c9cfc
Add new API to get the file descriptor reference to a lock suitable for sharing with other processes. Change-Id: I1b61f44b6d5745a628eb98dfdc876767c46552ea Signed-off-by: Alex Wong <waiw@codeaurora.org>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#ifndef _GENLOCK_H_
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#define _GENLOCK_H_
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#ifdef __KERNEL__
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struct genlock;
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struct genlock_handle;
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struct genlock_handle *genlock_get_handle(void);
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struct genlock_handle *genlock_get_handle_fd(int fd);
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int genlock_get_fd_handle(struct genlock_handle *handle);
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void genlock_put_handle(struct genlock_handle *handle);
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struct genlock *genlock_create_lock(struct genlock_handle *);
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struct genlock *genlock_attach_lock(struct genlock_handle *, int fd);
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int genlock_wait(struct genlock_handle *handle, u32 timeout);
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/* genlock_release_lock was deprecated */
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int genlock_lock(struct genlock_handle *handle, int op, int flags,
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u32 timeout);
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#endif
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#define GENLOCK_UNLOCK 0
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#define GENLOCK_WRLOCK 1
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#define GENLOCK_RDLOCK 2
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#define GENLOCK_NOBLOCK (1 << 0)
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#define GENLOCK_WRITE_TO_READ (1 << 1)
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struct genlock_lock {
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int fd;
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int op;
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int flags;
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int timeout;
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};
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#define GENLOCK_IOC_MAGIC 'G'
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#define GENLOCK_IOC_NEW _IO(GENLOCK_IOC_MAGIC, 0)
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#define GENLOCK_IOC_EXPORT _IOR(GENLOCK_IOC_MAGIC, 1, \
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struct genlock_lock)
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#define GENLOCK_IOC_ATTACH _IOW(GENLOCK_IOC_MAGIC, 2, \
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struct genlock_lock)
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/* Deprecated */
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#define GENLOCK_IOC_LOCK _IOW(GENLOCK_IOC_MAGIC, 3, \
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struct genlock_lock)
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/* Deprecated */
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#define GENLOCK_IOC_RELEASE _IO(GENLOCK_IOC_MAGIC, 4)
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#define GENLOCK_IOC_WAIT _IOW(GENLOCK_IOC_MAGIC, 5, \
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struct genlock_lock)
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#define GENLOCK_IOC_DREADLOCK _IOW(GENLOCK_IOC_MAGIC, 6, \
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struct genlock_lock)
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#endif
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