/**
 * D header file to interface with the Linux epoll API (http://man7.org/linux/man-pages/man7/epoll.7.html).
 * Available since Linux 2.6
 *
 * Copyright: Copyright Adil Baig 2012.
 * License : $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
 * Authors  : Adil Baig (github.com/adilbaig)
 */
module core.sys.linux.epoll;

version (linux):

extern (C):
@system:
@nogc:
nothrow:

version (ARM)     version = ARM_Any;
version (AArch64) version = ARM_Any;
version (MIPS32)  version = MIPS_Any;
version (MIPS64)  version = MIPS_Any;
version (PPC)     version = PPC_Any;
version (PPC64)   version = PPC_Any;
version (RISCV32) version = RISCV_Any;
version (RISCV64) version = RISCV_Any;
version (S390)    version = IBMZ_Any;
version (SPARC)   version = SPARC_Any;
version (SPARC64) version = SPARC_Any;
version (SystemZ) version = IBMZ_Any;
version (X86)     version = X86_Any;
version (X86_64)  version = X86_Any;

enum
{
    EPOLL_CLOEXEC  = 0x80000,
    EPOLL_NONBLOCK = 0x800
}

enum
{
    EPOLLIN     = 0x001,
    EPOLLPRI    = 0x002,
    EPOLLOUT    = 0x004,
    EPOLLRDNORM = 0x040,
    EPOLLRDBAND = 0x080,
    EPOLLWRNORM = 0x100,
    EPOLLWRBAND = 0x200,
    EPOLLMSG    = 0x400,
    EPOLLERR    = 0x008,
    EPOLLHUP    = 0x010,
    EPOLLRDHUP  = 0x2000, // since Linux 2.6.17
    EPOLLONESHOT = 1u << 30,
    EPOLLET     = 1u << 31
}

/* Valid opcodes ( "op" parameter ) to issue to epoll_ctl().  */
enum
{
    EPOLL_CTL_ADD = 1, // Add a file descriptor to the interface.
    EPOLL_CTL_DEL = 2, // Remove a file descriptor from the interface.
    EPOLL_CTL_MOD = 3, // Change file descriptor epoll_event structure.
}

version (X86_Any)
{
    align(1) struct epoll_event
    {
    align(1):
        uint events;
        epoll_data_t data;
    }
}
else version (ARM_Any)
{
    struct epoll_event
    {
        uint events;
        epoll_data_t data;
    }
}
else version (PPC_Any)
{
    struct epoll_event
    {
        uint events;
        epoll_data_t data;
    }
}
else version (MIPS_Any)
{
    struct epoll_event
    {
        uint events;
        epoll_data_t data;
    }
}
else version (RISCV_Any)
{
    struct epoll_event
    {
        uint events;
        epoll_data_t data;
    }
}
else version (SPARC_Any)
{
    struct epoll_event
    {
        uint events;
        epoll_data_t data;
    }
}
else version (IBMZ_Any)
{
    struct epoll_event
    {
        uint events;
        epoll_data_t data;
    }
}
else
{
    static assert(false, "Platform not supported");
}

union epoll_data_t
{
    void *ptr;
    int fd;
    uint u32;
    ulong u64;
}

int epoll_create (int size);
int epoll_create1 (int flags);
int epoll_ctl (int epfd, int op, int fd, epoll_event *event);
int epoll_wait (int epfd, epoll_event *events, int maxevents, int timeout);