The select system call is used in multiplexed I/O. The select system call blocks on a set of File descriptors (FD) until one of the FDs is ready for read/write. The select system call is provided below FIG Courtesy : The Linux Programming Interface – Michael Kerrisk The parameters of the API are explained below. […]
Select and Poll API
The Select and Poll API provide a means to perform multiplexed I/O on sockets from an application. In Linux, all opened sockets are file descriptors. If a particular application wishes to read from or write into multiple file descriptors, the program has to wait on the different file descriptors to know when data can be […]
IPv6 Socket Code Example
All the previous examples of socket programming in this website have been based on IPv4. In this code example, we see a stream IPv6 socket connection. The code for IPv6 is very similar to the IPv4 connection with minor changes in socket structure. For the interested reader, the IPv4 Socket example for stream sockets is […]
Raw Socket Code – IP_HDRINCL Code example
The previous code example (provided here) showed the usage of IPPROTO_RAW. In the current example, the protocol field is kept as IPPROTO_UDP (or any L4 protocol). However, the setsockopt API is used to set the IP_HDRINCL flag. The setting of this flag will again stop the kernel from adding the IP header and the onus […]
Raw Socket Code – IPPROTO_RAW example
We have not seen the usage of IPPROTO_RAW as a protocol in all of the previous articles. The current article provides a code example for IPPROTO_RAW as the protocol field in the socket API. If IPPROTO_RAW is used, then the IP header needs to be formulated by the application. The sample code fills in a […]