root/include/uapi/asm-generic/ipcbuf.h

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INCLUDED FROM

#ifndef __ASM_GENERIC_IPCBUF_H
#define __ASM_GENERIC_IPCBUF_H

/*
 * The generic ipc64_perm structure:
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * ipc64_perm 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.
 *
 * Pad space is left for:
 * - 32-bit mode_t on architectures that only had 16 bit
 * - 32-bit seq
 * - 2 miscellaneous 32-bit values
 */

struct ipc64_perm {
        __kernel_key_t          key;
        __kernel_uid32_t        uid;
        __kernel_gid32_t        gid;
        __kernel_uid32_t        cuid;
        __kernel_gid32_t        cgid;
        __kernel_mode_t         mode;
                                /* pad if mode_t is u16: */
        unsigned char           __pad1[4 - sizeof(__kernel_mode_t)];
        unsigned short          seq;
        unsigned short          __pad2;
        __kernel_ulong_t        __unused1;
        __kernel_ulong_t        __unused2;
};

#endif /* __ASM_GENERIC_IPCBUF_H */
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