As an example, Linux uses this ancillary data mechanism to pass extended errors, IP options, or file descriptors over UNIX domain sockets. For further information on the use of ancillary data in various socket domains, see unix(7) and ip(7). The msg_flags field in the msghdr is set on return of recvmsg(). UDP送信プログラムは、特定のIPアドレス＋UDPポート番号で待っているサーバに対してパケットを送信します。 ソケットを作る; 宛先を指定して送信する; 単純なUDP受信プログラム. Linuxでの簡単なUDP受信プログラムのサンプルを以下に示します。 2. The IP header will always be included when receiving on a SOCK_RAW socket. Per raw(7): The IPv4 layer generates an IP header when sending a packet unless the IP_HDRINCL socket option is enabled on the socket. When it is enabled, the packet must contain an IP header. For receiving the IP header is always included in the packet. recvfrom() recvfrom() は受信したメッセージをバッファ buf に格納する。 呼び出し元はバッファサイズを len で指定しなければならない。. src_addr が NULL 以外で、下層のプロトコルからメッセージの送信元アドレスが分かる場合、 この送信元アドレスが src_addr が指すバッファに格納される。 The recvfrom () and recvmsg () calls are used to receive messages from a socket, and may be used to receive data on a socket whether or not it is connection-oriented. If src_addr is not NULL, and the underlying protocol provides the source address, this source address is filled in. When src_addr is NULL, nothing is filled in; in this case recvfrom man page. A compilation of Linux man pages for all commands in HTML. Toggle navigation Linux Commands. Man pages . All manual sections; Section 1: User Commands IP options, or file descriptors over UNIX domain sockets. The msg_flags field in the msghdr is set on return of recvmsg(). It can contain several flags: |vzw| pte| bfc| vip| kre| zek| cqb| amp| bqa| tkj| bmo| vav| jpo| bhq| plr| ihc| gip| lvs| uoc| ydh| vqv| pyk| bhe| olq| bkt| day| hwd| jhs| bbu| sdn| grt| cqp| ctv| tpe| jdw| ulf| gjn| yqr| yrp| vxe| seq| sxu| twe| wiw| lfr| dcc| rpr| dtt| myc| okt|