UNIXSocket

Parent:BasicSocket

UNIXSocket表示一个UNIX域流客户端套接字。

公共类方法

new(path) → unixsocket Show source

创建连接到路径 的新的UNIX客户端套接字。

require 'socket'

s = UNIXSocket.new("/tmp/sock")
s.send "hello", 0

static VALUE
unix_init(VALUE sock, VALUE path)
{
    return rsock_init_unixsock(sock, path, 0);
}

pair([type , protocol]) → unixsocket1, unixsocket2()

创建一对互相连接的socket。

socktype应该是一个套接字类型，例如：：STREAM，：DGRAM，：RAW等。

协议应该是在域中定义的协议。0是域的默认协议。

s1, s2 = UNIXSocket.pair
s1.send "a", 0
s1.send "b", 0
p s2.recv(10) #=> "ab"

static VALUE
unix_s_socketpair(int argc, VALUE *argv, VALUE klass)
{
    VALUE domain, type, protocol;
    VALUE args[3];

    domain = INT2FIX(PF_UNIX);
    rb_scan_args(argc, argv, "02", &type, &protocol);
    if (argc == 0)
        type = INT2FIX(SOCK_STREAM);
    if (argc <= 1)
        protocol = INT2FIX(0);

    args[0] = domain;
    args[1] = type;
    args[2] = protocol;

    return rsock_sock_s_socketpair(3, args, klass);
}

socketpair([type , protocol]) → unixsocket1, unixsocket2()

创建一对互相连接的插座。

socktype 应该是一个套接字类型，例如：：STREAM，：DGRAM，：RAW等。

protocol 应该是在域中定义的协议。0是域的默认协议。

s1, s2 = UNIXSocket.pair
s1.send "a", 0
s1.send "b", 0
p s2.recv(10) #=> "ab"

static VALUE
unix_s_socketpair(int argc, VALUE *argv, VALUE klass)
{
    VALUE domain, type, protocol;
    VALUE args[3];

    domain = INT2FIX(PF_UNIX);
    rb_scan_args(argc, argv, "02", &type, &protocol);
    if (argc == 0)
        type = INT2FIX(SOCK_STREAM);
    if (argc <= 1)
        protocol = INT2FIX(0);

    args[0] = domain;
    args[1] = type;
    args[2] = protocol;

    return rsock_sock_s_socketpair(3, args, klass);
}

公共实例方法

addr → address_family, unix_path()

以包含address_family和unix_path的数组的形式返回本地地址。

例

serv = UNIXServer.new("/tmp/sock")
p serv.addr #=> ["AF_UNIX", "/tmp/sock"]

static VALUE
unix_addr(VALUE sock)
{
    rb_io_t *fptr;
    struct sockaddr_un addr;
    socklen_t len = (socklen_t)sizeof addr;
    socklen_t len0 = len;

    GetOpenFile(sock, fptr);

    if (getsockname(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
        rsock_sys_fail_path("getsockname(2)", fptr->pathv);
    if (len0 < len) len = len0;
    return rsock_unixaddr(&addr, len);
}

path → path Show source

返回unixsocket本地地址的路径。

s = UNIXServer.new("/tmp/sock")
p s.path #=> "/tmp/sock"

static VALUE
unix_path(VALUE sock)
{
    rb_io_t *fptr;

    GetOpenFile(sock, fptr);
    if (NIL_P(fptr->pathv)) {
        struct sockaddr_un addr;
        socklen_t len = (socklen_t)sizeof(addr);
        socklen_t len0 = len;
        if (getsockname(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
            rsock_sys_fail_path("getsockname(2)", fptr->pathv);
        if (len0 < len) len = len0;
        fptr->pathv = rb_obj_freeze(rsock_unixpath_str(&addr, len));
    }
    return rb_str_dup(fptr->pathv);
}

peeraddr → address_family, unix_path()

以包含address_family和unix_path的数组的形式返回远程地址。

例

serv = UNIXServer.new("/tmp/sock")
c = UNIXSocket.new("/tmp/sock")
p c.peeraddr #=> ["AF_UNIX", "/tmp/sock"]

static VALUE
unix_peeraddr(VALUE sock)
{
    rb_io_t *fptr;
    struct sockaddr_un addr;
    socklen_t len = (socklen_t)sizeof addr;
    socklen_t len0 = len;

    GetOpenFile(sock, fptr);

    if (getpeername(fptr->fd, (struct sockaddr*)&addr, &len) < 0)
        rsock_sys_fail_path("getpeername(2)", fptr->pathv);
    if (len0 < len) len = len0;
    return rsock_unixaddr(&addr, len);
}

recv_io([klass , mode]) → io Show source

例

UNIXServer.open("/tmp/sock") {|serv|
  UNIXSocket.open("/tmp/sock") {|c|
    s = serv.accept

    c.send_io STDOUT
    stdout = s.recv_io

    p STDOUT.fileno #=> 1
    p stdout.fileno #=> 7

    stdout.puts "hello" # outputs "hello\n" to standard output.
  }
}

klass将确定返回的io类（使用IO.for_fd单例方法或类似方法）。 如果klass为零，则返回整数文件描述符。

mode 与传递给IO.for_fd的参数相同

static VALUE
unix_recv_io(int argc, VALUE *argv, VALUE sock)
{
    VALUE klass, mode;
    rb_io_t *fptr;
    struct iomsg_arg arg;
    struct iovec vec[2];
    char buf[1];

    int fd;
#if FD_PASSING_BY_MSG_CONTROL
    union {
        struct cmsghdr hdr;
        char pad[sizeof(struct cmsghdr)+8+sizeof(int)+8];
    } cmsg;
#endif

    rb_scan_args(argc, argv, "02", &klass, &mode);
    if (argc == 0)
        klass = rb_cIO;
    if (argc <= 1)
        mode = Qnil;

    GetOpenFile(sock, fptr);

    arg.msg.msg_name = NULL;
    arg.msg.msg_namelen = 0;

    vec[0].iov_base = buf;
    vec[0].iov_len = sizeof(buf);
    arg.msg.msg_iov = vec;
    arg.msg.msg_iovlen = 1;

#if FD_PASSING_BY_MSG_CONTROL
    arg.msg.msg_control = (caddr_t)&cmsg;
    arg.msg.msg_controllen = (socklen_t)CMSG_SPACE(sizeof(int));
    arg.msg.msg_flags = 0;
    cmsg.hdr.cmsg_len = (socklen_t)CMSG_LEN(sizeof(int));
    cmsg.hdr.cmsg_level = SOL_SOCKET;
    cmsg.hdr.cmsg_type = SCM_RIGHTS;
    fd = -1;
    memcpy(CMSG_DATA(&cmsg.hdr), &fd, sizeof(int));
#else
    arg.msg.msg_accrights = (caddr_t)&fd;
    arg.msg.msg_accrightslen = sizeof(fd);
    fd = -1;
#endif

    arg.fd = fptr->fd;
    while ((int)BLOCKING_REGION_FD(recvmsg_blocking, &arg) == -1) {
        if (!rb_io_wait_readable(arg.fd))
            rsock_sys_fail_path("recvmsg(2)", fptr->pathv);
    }

#if FD_PASSING_BY_MSG_CONTROL
    if (arg.msg.msg_controllen < (socklen_t)sizeof(struct cmsghdr)) {
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (msg_controllen=%d smaller than sizeof(struct cmsghdr)=%d)",
                 (int)arg.msg.msg_controllen, (int)sizeof(struct cmsghdr));
    }
    if (cmsg.hdr.cmsg_level != SOL_SOCKET) {
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (cmsg_level=%d, %d expected)",
                 cmsg.hdr.cmsg_level, SOL_SOCKET);
    }
    if (cmsg.hdr.cmsg_type != SCM_RIGHTS) {
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (cmsg_type=%d, %d expected)",
                 cmsg.hdr.cmsg_type, SCM_RIGHTS);
    }
    if (arg.msg.msg_controllen < (socklen_t)CMSG_LEN(sizeof(int))) {
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (msg_controllen=%d smaller than CMSG_LEN(sizeof(int))=%d)",
                 (int)arg.msg.msg_controllen, (int)CMSG_LEN(sizeof(int)));
    }
    if ((socklen_t)CMSG_SPACE(sizeof(int)) < arg.msg.msg_controllen) {
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (msg_controllen=%d bigger than CMSG_SPACE(sizeof(int))=%d)",
                 (int)arg.msg.msg_controllen, (int)CMSG_SPACE(sizeof(int)));
    }
    if (cmsg.hdr.cmsg_len != CMSG_LEN(sizeof(int))) {
        rsock_discard_cmsg_resource(&arg.msg, 0);
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (cmsg_len=%d, %d expected)",
                 (int)cmsg.hdr.cmsg_len, (int)CMSG_LEN(sizeof(int)));
    }
#else
    if (arg.msg.msg_accrightslen != sizeof(fd)) {
        rb_raise(rb_eSocket,
                 "file descriptor was not passed (accrightslen=%d, %d expected)",
                 arg.msg.msg_accrightslen, (int)sizeof(fd));
    }
#endif

#if FD_PASSING_BY_MSG_CONTROL
    memcpy(&fd, CMSG_DATA(&cmsg.hdr), sizeof(int));
#endif

    rb_update_max_fd(fd);

    if (rsock_cmsg_cloexec_state < 0)
        rsock_cmsg_cloexec_state = rsock_detect_cloexec(fd);
    if (rsock_cmsg_cloexec_state == 0 || fd <= 2)
        rb_maygvl_fd_fix_cloexec(fd);

    if (klass == Qnil)
        return INT2FIX(fd);
    else {
        ID for_fd;
        int ff_argc;
        VALUE ff_argv[2];
        CONST_ID(for_fd, "for_fd");
        ff_argc = mode == Qnil ? 1 : 2;
        ff_argv[0] = INT2FIX(fd);
        ff_argv[1] = mode;
        return rb_funcallv(klass, for_fd, ff_argc, ff_argv);
    }
}

recvfrom(maxlen [, flags, outbuf]) → mesg, unixaddress()

通过unixsocket 接收消息。

maxlen 是要接收的最大字节数。

flags 应该是Socket :: MSG_ *常量的按位或。

即使outbuf 在开始时不是空的，outbuf 也只会包含方法调用后接收到的数据。

s1 = Socket.new(:UNIX, :DGRAM, 0)
s1_ai = Addrinfo.unix("/tmp/sock1")
s1.bind(s1_ai)

s2 = Socket.new(:UNIX, :DGRAM, 0)
s2_ai = Addrinfo.unix("/tmp/sock2")
s2.bind(s2_ai)
s3 = UNIXSocket.for_fd(s2.fileno)

s1.send "a", 0, s2_ai
p s3.recvfrom(10) #=> ["a", ["AF_UNIX", "/tmp/sock1"]]

static VALUE
unix_recvfrom(int argc, VALUE *argv, VALUE sock)
{
    return rsock_s_recvfrom(sock, argc, argv, RECV_UNIX);
}

send_io(io) → nil Show source

发送io 作为文件描述符传递。

s1, s2 = UNIXSocket.pair

s1.send_io STDOUT
stdout = s2.recv_io

p STDOUT.fileno #=> 1
p stdout.fileno #=> 6

stdout.puts "hello" # outputs "hello\n" to standard output.

io 可以是任何类型的IO对象或整型文件描述符。

static VALUE
unix_send_io(VALUE sock, VALUE val)
{
    int fd;
    rb_io_t *fptr;
    struct iomsg_arg arg;
    struct iovec vec[1];
    char buf[1];

#if FD_PASSING_BY_MSG_CONTROL
    union {
        struct cmsghdr hdr;
        char pad[sizeof(struct cmsghdr)+8+sizeof(int)+8];
    } cmsg;
#endif

    if (rb_obj_is_kind_of(val, rb_cIO)) {
        rb_io_t *valfptr;
        GetOpenFile(val, valfptr);
        fd = valfptr->fd;
    }
    else if (FIXNUM_P(val)) {
        fd = FIX2INT(val);
    }
    else {
        rb_raise(rb_eTypeError, "neither IO nor file descriptor");
    }

    GetOpenFile(sock, fptr);

    arg.msg.msg_name = NULL;
    arg.msg.msg_namelen = 0;

    /* Linux and Solaris doesn't work if msg_iov is NULL. */
    buf[0] = '\0';
    vec[0].iov_base = buf;
    vec[0].iov_len = 1;
    arg.msg.msg_iov = vec;
    arg.msg.msg_iovlen = 1;

#if FD_PASSING_BY_MSG_CONTROL
    arg.msg.msg_control = (caddr_t)&cmsg;
    arg.msg.msg_controllen = (socklen_t)CMSG_LEN(sizeof(int));
    arg.msg.msg_flags = 0;
    MEMZERO((char*)&cmsg, char, sizeof(cmsg));
    cmsg.hdr.cmsg_len = (socklen_t)CMSG_LEN(sizeof(int));
    cmsg.hdr.cmsg_level = SOL_SOCKET;
    cmsg.hdr.cmsg_type = SCM_RIGHTS;
    memcpy(CMSG_DATA(&cmsg.hdr), &fd, sizeof(int));
#else
    arg.msg.msg_accrights = (caddr_t)&fd;
    arg.msg.msg_accrightslen = sizeof(fd);
#endif

    arg.fd = fptr->fd;
    while ((int)BLOCKING_REGION_FD(sendmsg_blocking, &arg) == -1) {
        if (!rb_io_wait_writable(arg.fd))
            rsock_sys_fail_path("sendmsg(2)", fptr->pathv);
    }

    return Qnil;
}