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authorDavid Howells <dhowells@redhat.com>2012-10-04 18:20:15 +0100
committerDavid Howells <dhowells@redhat.com>2012-10-04 18:20:15 +0100
commit8a1ab3155c2ac7fbe5f2038d6e26efeb607a1498 (patch)
tree42ef93e164b8b2a01adab30db4b33f370f4280d7 /include/uapi/asm-generic/sembuf.h
parentf3dfd599af993385b40fc7a1c947afc12729bc4d (diff)
UAPI: (Scripted) Disintegrate include/asm-generic
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'include/uapi/asm-generic/sembuf.h')
-rw-r--r--include/uapi/asm-generic/sembuf.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/uapi/asm-generic/sembuf.h b/include/uapi/asm-generic/sembuf.h
new file mode 100644
index 000000000000..4cb2c13e5090
--- /dev/null
+++ b/include/uapi/asm-generic/sembuf.h
@@ -0,0 +1,38 @@
+#ifndef __ASM_GENERIC_SEMBUF_H
+#define __ASM_GENERIC_SEMBUF_H
+
+#include <asm/bitsperlong.h>
+
+/*
+ * The semid64_ds structure for x86 architecture.
+ * Note extra padding because this structure is passed back and forth
+ * between kernel and user space.
+ *
+ * semid64_ds was originally meant to be architecture specific, but
+ * everyone just ended up making identical copies without specific
+ * optimizations, so we may just as well all use the same one.
+ *
+ * 64 bit architectures typically define a 64 bit __kernel_time_t,
+ * so they do not need the first two padding words.
+ * On big-endian systems, the padding is in the wrong place.
+ *
+ * Pad space is left for:
+ * - 64-bit time_t to solve y2038 problem
+ * - 2 miscellaneous 32-bit values
+ */
+struct semid64_ds {
+ struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
+ __kernel_time_t sem_otime; /* last semop time */
+#if __BITS_PER_LONG != 64
+ unsigned long __unused1;
+#endif
+ __kernel_time_t sem_ctime; /* last change time */
+#if __BITS_PER_LONG != 64
+ unsigned long __unused2;
+#endif
+ unsigned long sem_nsems; /* no. of semaphores in array */
+ unsigned long __unused3;
+ unsigned long __unused4;
+};
+
+#endif /* __ASM_GENERIC_SEMBUF_H */

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