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answered Jul 19, 2009 at 22:37Prior to standardization there was ioctl(...FIONBIO...) and fcntl(...O_NDELAY...), but these behaved inconsistently between systems, and even within the same system. For example, it was common for FIONBIO to work on sockets and O_NDELAY to work on ttys, with a lot of inconsistency for things like pipes, fifos, and devices. And if you didn't know what kind of file descriptor you had, you'd have to set both to be sure. But in addition, a non-blocking read with no data available was also indicated inconsistently; depending on the OS and the typ...
Content Under CC-BY-SA license WEBFeb 1, 2017 · Even today, setting FIONBIO or O_NDELAY on Solaris causes a read with no data to return 0 on a tty or pipe, or -1 with errno EAGAIN on a socket. However 0 is …
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- This section describes Winsock Socket input/output controls (IOCTLs) for various editions of Wi…
Some Winsock IOCTLs require more explanation than this table can convey; such options contain links to additional topics. - It is possible to adopt an encoding scheme that preserves the currently defined ioctlsocket opco…
I is set if the input buffer is valid for the code, as with IOC_IN.
- This section describes Winsock Socket input/output controls (IOCTLs) for various editions of Wi…
WEBMar 18, 2022 · FIONBIO: Unsigned long <Not used> Enables or disables nonblocking mode on the socket. FIONREAD <Not used> Unsigned long: Determines the amount of data …
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WEBSocket I/O Modes. Sockets can be set to either blocking or nonblocking I/O mode. The FIONBIO ioctl operation is used to determine this mode. When the FIONBIO ioctl is set, …
WEBJul 25, 2012 · VxWorks's standard method to set FIONBIO is with ioctl(), not fcntl(). The documentation for FIONBIO gives this as an example, which obviously isn't going to …
WEBChange a socket to nonblocking mode using the ioctl () call that specifies command FIONBIO and a fullword (four byte) argument with a nonzero binary value. Any …
WEBThe following ioctl () commands are used with sockets: Command. Description. FIONBIO. Sets or clears nonblocking I/O for a socket. arg is a pointer to an integer. If the integer is …
ioctl(2) - daemon-systems.org
WEBSep 29, 2022 · FIONBIO int Set non-blocking I/O mode if the argument is non-zero. In non- blocking mode, read(2) or write(2) calls return -1 and set errno to EAGAIN immediately …
WEBSep 14, 2012 · It is used to set or retrieve operating parameters associated with the socket, independent of the protocol and communications subsystem. The supported commands …
lwIP - ESP32 - — ESP-IDF Programming Guide v5.2.1 documentation
WEB[中文] ESP-IDF uses the open source lwIP lightweight TCP/IP stack. The ESP-IDF version of lwIP ( esp-lwip) has some modifications and additions compared to the upstream …
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