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https://www.cnet.com/forums/discussions/eafnosupport-address-family-not-supported-on-sendto/
Sep 26, 2018 · Reporting: EAFNOSUPPORT (Address Family not supported) on sendto() This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET…
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.bpxbd00/sndt.htm
If successful, sendto() returns the number of characters sent. A value of 0 or greater indicates the number of bytes sent, however, this does not assure that data delivery was complete. A connection can be dropped by a peer socket and a SIGPIPE signal generated at a later time if data delivery is not complete.
http://www.linuxhowtos.org/manpages/3p/sendto.htm
The sendto() function shall send a message through a connection-mode or connectionless-mode socket. If the socket is a connectionless-mode socket, the message shall be sent to the address specified by dest_addr if no pre-specified peer address has been set.
http://man7.org/linux/man-pages/man3/sendto.3p.html
The sendto() function shall fail if: EAFNOSUPPORT Addresses in the specified address family cannot be used with this socket. EAGAIN or EWOULDBLOCK The socket's file descriptor is marked O_NONBLOCK and the requested operation would block.
http://www.qnx.com/developers/docs/6.5.0/topic/com.qnx.doc.neutrino_lib_ref/s/sendto.html
The sendto() function is used to transmit a message to another socket. You can use send() only when the socket is in a connected state; you can use sendto() 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.
https://www.unix.com/man-page/posix/3p/sendto
SENDTO(3P) POSIX Programmer's Manual SENDTO(3P) PROLOG This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
https://github.com/nodejs/node-v0.x-archive/issues/8616
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https://stackoverflow.com/questions/22977839/sockets-sendto-returning-einval
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https://stackoverflow.com/questions/13452224/possible-causes-of-errno-97-aka-eafnosupport-aka-address-family-not-supported-by
If you are passing an in_addr where a sockaddr is expected then the problem is simply that when the system call looks at what it thinks is the address family in what it thinks is a sockaddr structure it is really seeing one of the bytes of your multicast address, which is presumably not a valid address family.. To explain more, a sockaddr_in looks like this:
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