ipcbuf.h

Go to the documentation of this file.

#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;
    unsigned long       __unused1;
    unsigned long       __unused2;
};

#endif /* __ASM_GENERIC_IPCBUF_H */