Re: [naviserver-devel] Old style binder -re-support

[Zoran V. <zv...@ar...>]

Am 02.11.2005 um 23:31 schrieb Vlad Seryakov:

> What man sendmsg on Darwin says?
> If it does not support it, need to add Darwin-specific into aclocal  
> and binder

Well, Also the AC_HAVE_CMMSG is not present...


This is what manpage says..

NAME
      send, sendto, sendmsg -- send a message from a socket

SYNOPSIS
      #include <sys/types.h>
      #include <sys/socket.h>

      ssize_t
      send(int s, const void *msg, size_t len, int flags);

      ssize_t
      sendto(int s, const void *msg, size_t len, int flags,
          const struct sockaddr *to, socklen_t tolen);

      ssize_t
      sendmsg(int s, const struct msghdr *msg, int flags);

DESCRIPTION
      Send(), sendto(), and sendmsg() are used to transmit a message  
to another
      socket.  Send() may be used only when the socket is in a  
connected state,
      while sendto() and sendmsg() may be used at any time.

      The address of the target is given by to with tolen specifying  
its size.
      The length of the message is given by len.  If the message is  
too long to
      pass atomically through the underlying protocol, the error  
EMSGSIZE is
      returned, and the message is not transmitted.

      No indication of failure to deliver is implicit in a send().   
Locally
      detected errors are indicated by a return value of -1.

      If no messages space is available at the socket to hold the  
message to be
      transmitted, then send() normally blocks, unless the socket has  
been
      placed in non-blocking I/O mode.  The select(2) call may be  
used to
      determine when it is possible to send more data.
      The flags parameter may include one or more of the following:

      #define MSG_OOB        0x1  /* process out-of-band data */
      #define MSG_DONTROUTE  0x4  /* bypass routing, use direct  
interface */

      The flag MSG_OOB is used to send ``out-of-band'' data on  
sockets that
      support this notion (e.g.  SOCK_STREAM); the underlying  
protocol must
      also support ``out-of-band'' data.  MSG_DONTROUTE is usually  
used only by
      diagnostic or routing programs.

      See recv(2) for a description of the msghdr structure.

RETURN VALUES
      The call returns the number of characters sent, or -1 if an error
      occurred.

ERRORS
      Send(), sendto(), and sendmsg() fail if:

      [EBADF]            An invalid descriptor was specified.

      [ENOTSOCK]         The argument s is not a socket.

      [EFAULT]           An invalid user space address was specified  
for a
                         parameter.

      [EMSGSIZE]         The socket requires that message be sent  
atomically,
                         and the size of the message to be sent made  
this
                         impossible.

      [EAGAIN]           The socket is marked non-blocking and the  
requested
                         operation would block.

      [ENOBUFS]          The system was unable to allocate an  
internal buffer.
                         The operation may succeed when buffers  
become avail-
                         able.

      [ENOBUFS]          The output queue for a network interface was  
full.
                         This generally indicates that the interface has
                         stopped sending, but may be caused by  
transient con-
                         gestion.


      [EACCES]           The SO_BROADCAST option is not set on the  
socket, and
                         a broadcast address was given as the  
destination.

      [EHOSTUNREACH]     The destination address specified an  
unreachable host.

SEE ALSO
      fcntl(2), recv(2), select(2), getsockopt(2), socket(2), write(2)

HISTORY
      The send() function call appeared in 4.2BSD.

4.2 Berkeley Distribution      February 21, 1994     4.2 Berkeley  
Distribution