cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / asm-generic / sembuf.h

diff --git a/i686-linux-gnu-4.7/usr/include/asm-generic/sembuf.h b/i686-linux-gnu-4.7/usr/include/asm-generic/sembuf.h
new file mode 100644 (file)
index 0000000..0bae010
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/asm-generic/sembuf.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#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 use a 64-bit __kernel_time_t here, while
+ * 32 bit architectures have a pair of unsigned long values.
+ * so they do not need the first two padding words.
+ *
+ * On big-endian systems, the padding is in the wrong place for
+ * historic reasons, so user space has to reconstruct a time_t
+ * value using
+ *
+ * user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime +
+ *             ((long long)kernel_semid64_ds.sem_otime_high << 32)
+ *
+ * Pad space is left for 2 miscellaneous 32-bit values
+ */
+struct semid64_ds {
+       struct ipc64_perm sem_perm;     /* permissions .. see ipc.h */
+#if __BITS_PER_LONG == 64
+       __kernel_time_t sem_otime;      /* last semop time */
+       __kernel_time_t sem_ctime;      /* last change time */
+#else
+       unsigned long   sem_otime;      /* last semop time */
+       unsigned long   sem_otime_high;
+       unsigned long   sem_ctime;      /* last change time */
+       unsigned long   sem_ctime_high;
+#endif
+       unsigned long   sem_nsems;      /* no. of semaphores in array */
+       unsigned long   __unused3;
+       unsigned long   __unused4;
+};
+
+#endif /* __ASM_GENERIC_SEMBUF_H */