os.84

{
: file_create
: file_open
: file_close
: file_read_all
: die
: argc
: argv
: O_RDONLY 0
: O_WRONLY 1
: O_RDWR 2
: O_CREAT 64
: O_TRUNC 512
: O_CLOEXEC [512 * 1024]
: PROT_READ 1
: PROT_WRITE 2
: PROT_EXEC 4
: MAP_SHARED 1
: MAP_PRIVATE 2
: EPOLL_CTL_ADD 1
: EPOLL_CTL_DEL 2
: EPOLL_CTL_MOD 3
: EPOLL_CLOEXEC [512 * 1024]
: EPOLLIN 1
: EPOLLOUT 4
: EPOLLERR 8
: EPOLLHUP 16
: exec
: exit
: getcwd
: open
: close
: read
: write
: mmap
: munmap
: epoll_create1
: epoll_wait
: epoll_ctl
}

Where

Define (file_create name)
    (Prim file_create name)

Define (file_open name)
    (Prim file_open name)

Define (file_close file)
    (Prim file_close file)

Define (file_read_all file)
    (Prim file_read_all file)

Define (die message)
    (Prim die message)

Let argc (Prim command_argc)

Define (argv i)
    (Prim command_argv i)

Define (exec path args vars)
    Let path_offset 0
    Let arg_offsets (CHUNK.new [4 * (LIST.length args)])
    Let var_offsets (CHUNK.new [4 * (LIST.length vars)])
    Let table
        Let path_size [(STRING.length path) + 1]
        Let args_size
            (LIST.reduce args 0
                Func {sum arg} [sum + (STRING.length arg) + 1])
        Let vars_size
            (LIST.reduce vars 0
                Func {sum var} [sum + (STRING.length var) + 1])
        In
        (CHUNK.new [path_size + args_size + vars_size])
    In
    Define (store_strings strings offsets prefix_size)
        Let {_ prefix_size}
            (LIST.reduce strings {0 prefix_size}
                Func {{i offset} s}
                    Begin {
                        (CHUNK.store_uint32 offsets [4 * i] offset)
                        (CHUNK.store_bytes table offset s 0 (STRING.length s))
                        (CHUNK.store_byte table [offset + (STRING.length s)] 0)
                        (Return [i + 1] [offset + (STRING.length s) + 1])
                    })
        In
        prefix_size
    In
    Begin {
        (CHUNK.store_bytes table 0 path 0 (STRING.length path))
        (CHUNK.store_byte table (STRING.length path) 0)
        Let prefix_size [(STRING.length path) + 1]
        Let prefix_size (store_strings args arg_offsets prefix_size)
        Let prefix_size (store_strings vars var_offsets prefix_size)
        (Return (Prim exec path_offset arg_offsets var_offsets table))
    }

Define (exit status)
    (Prim exit status)

Define (getcwd)
    (Prim getcwd)

Define (open name flags mode)
    (Prim open name flags mode)

Define (close fd)
    (Prim close fd)

Define (read fd chunk start count)
    (Prim read fd chunk start count)

Define (write fd chunk start count)
    (Prim write fd chunk start count)

Define (mmap i size prot flags fd offset)
    (Prim mmap i size prot flags fd offset)

Define (munmap i)
    (Prim munmap i)

Define (epoll_create1 flags)
    (Prim epoll_create1 flags)

Define (epoll_wait epoll_fd events max_events timeout)
    (Prim epoll_wait epoll_fd events max_events timeout)

Define (epoll_ctl epoll_fd op fd event)
    (Prim epoll_ctl epoll_fd op fd event)

Where

Let CHUNK Package "chunk"
Let LIST Package "list"
Let STRING Package "string"