WEB select: Monitoring Multiple File Descriptors
Introduction
The WEB select function allows a program to monitor multiple file descriptors, waiting until one or more of the file descriptors become available for reading, writing, or both. This function is useful for implementing event-driven programs that need to respond to input from multiple sources.
How it Works
When a program calls WEB select, it passes an array of file descriptors, a read file descriptor set, and a write file descriptor set. The function then blocks until at least one file descriptor in either set becomes available. When a file descriptor becomes available, the function returns the number of file descriptors that have become available. The program can then use the returned information to determine which file descriptors are ready for reading or writing.
Advantages of Using WEB select
There are several advantages to using WEB select: * It is efficient: WEB select uses a single system call to monitor multiple file descriptors, which can reduce the overhead of polling each file descriptor individually. * It is portable: WEB select is a POSIX standard function, which means that it is available on most UNIX-like operating systems. * It is easy to use: WEB select is relatively easy to use, and it can be integrated into any program that needs to monitor multiple file descriptors.
Conclusion
WEB select is a powerful function that can be used to implement event-driven programs that need to respond to input from multiple sources. It is efficient, portable, and easy to use.
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