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To close a file descriptor for a pipe in C, use the close() function.

Assuming you have opened the pipe using the pipe() function and stored the file descriptors in variables pipefd[0] and pipefd[1], the following code shows how to close them:

// Close the read end of the pipe
close(pipefd[0]);

// Close the write end of the pipe
close(pipefd[1]);

Note that once a file descriptor has been closed, it cannot be used again. It is recommended to set the variable to -1 after you have closed it, to prevent accidental reuse of the file descriptor.