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

[Vlad S. <vl...@cr...>]

I am not sure why AC_HAVE_CMMSG is no define, i added it into 
configure.in and under m4/cmmsg.m4. On linux no errors.

Also, can you find the definition of struct msghdr in sys/socket.h, 
looks like Darwin has different fields there.

Zoran Vasiljevic wrote:
> 
> 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
> 
> 
> 
> 
> 
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-- 
Vlad Seryakov
571 262-8608 office
vl...@cr...
http://www.crystalballinc.com/vlad/