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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