ioctl() - 装置の制御 - IBM
WEBFIONREAD ソケットに対して、ただちに読み取り可能なバイト数を取得します。 arg は整数へのポインターです。整数の値を、ソケットでただちに読み取り可能な文字数に設定します。 FIONWRITE 接続されたピア AF_UNIX ストリーム・ソケット ...
Winsock IOCTL (Winsock2.h) - Win32 apps | Microsoft Learn
WEBJun 13, 2023 · s パラメーターで渡されたソケットがストリーム指向の場合 (例: SOCK_STREAM型)、FIONREAD は 1 回の受信操作で読み取ることができるデータの合計量を返します。これは通常、ソケットでキューに格納されているデータの合計量と同じ
What does FIONREAD of UDP (datagram) sockets return?
WEBJun 8, 2013 · FIONREAD (SIOCINQ) Gets a pointer to an integer as argument. Returns the size of the next pending datagram in the integer in bytes, or 0 when no datagram is pending. Warning: Using FIONREAD, it is
c - Linux - ioctl with FIONREAD always 0 - Stack Overflow
WEBAug 14, 2013 · I'm trying to get to know how many bytes there are readable at my TCP socket. I am calling ioctl with the Flag "FIONREAD" which should actually give me this value. When I call the function I get as return val 0 ( so no Error ) but also my integer argument gets the value 0.
ioctl_tty(2) - Linux manual page
WEBTIOCINQ Argument: int *argp Same as FIONREAD. TIOCOUTQ Argument: int * argp Get the number of bytes in the output buffer. TCFLSH Argument: int arg Equivalent to tcflush(fd, arg) .
ioctl(2) - FreeBSD
WEBDESCRIPTION. The ioctl () system call manipulates the underlying device parameters of. specialfiles. In particular, many operating characteristics of char-. acter special files (e.g. terminals) maybe controlled with ioctl () re-. quests. …
ioctl(2) - Linux manual page
WEBIn order to use this call, one needs an open file descriptor. Often the open (2) call has unwanted side effects, that can be avoided under Linux by giving it the O_NONBLOCK flag. ioctl structure Ioctl command values are 32-bit constants. In principle these constants are completely arbitrary, but people have tried to build some structure into them.
IOCTL - IBM
WEBFIONREAD 読み取り準備ができている受信キュー上のバイト数を要求します。 このコマンドは、戻りコードと読み取り準備のできているバイト数を含むストリングを戻します。 SIOCATMARK 入力データの現在の場所がアウト・オブ・バンド ...
c++ - ioctl with FIONREAD return value - Stack Overflow
WEBSep 24, 2013 · So what you are likely seeing is simply FIONREAD reporting additional bytes in the socket's receive buffer that are related to messages after the next pending message. If you need to know the size of the next pending message, use FIONREAD to know when to call recvfrom() , but don't rely on FIONREAD to tell you the actual …
FIONREAD - STREAMS Programming Guide - Oracle
WEBNov 11, 2014 · FIONREAD. The FIONREAD ioctl returns the number of data bytes (in all data messages queued) in the location pointed to by the arg parameter. The ioctl returns a 32-bit quantity for both 32-bit and 64-bit application., Therefore, code that passes the address of a long variable needs to be changed to pass an int variable for 64–bit …
- Some results have been removed
Skip to content