The error “Bad file descriptor” with errno 9 typically occurs when a file descriptor passed to a system call is not valid or refers to a closed file. Here are a few possible reasons for this error:
Incorrect file descriptor: This error may occur if you pass an incorrect or invalid file descriptor to a system call. Make sure that the file descriptor you are using is valid and refers to an open file or resource.
File descriptor is closed: If you are trying to use a file descriptor that has already been closed, the system call may return this error. Ensure that the file descriptor is still open and valid before using it.
Race condition or concurrency issue: In some cases, multiple threads or processes may attempt to access the same file descriptor concurrently, leading to a race condition. This can result in the file descriptor being closed or invalidated by another thread or process while a system call is being executed.
To troubleshoot this issue, you should review your code and verify that the file descriptor being used is valid and open. Additionally, check for any concurrency issues that may lead to the file descriptor being closed unexpectedly.
当传递给系统调用的文件描述符无效或指向已关闭的文件时，通常会发生带有errno 9的错误“错误文件描述符”。以下是导致此错误的几个可能原因:
不正确的文件描述符:如果将不正确或无效的文件描述符传递给系统调用，可能会发生此错误。确保您正在使用的文件描述符是有效的，并且引用一个打开的文件或资源。
文件描述符已关闭:如果您试图使用已经关闭的文件描述符，系统调用可能会返回此错误。在使用文件描述符之前，确保它仍然是打开的且有效的。
竞争条件或并发性问题:在某些情况下，多个线程或进程可能试图并发访问相同的文件描述符，从而导致竞争条件。这可能导致文件描述符在执行系统调用时被另一个线程或进程关闭或失效。
要解决此问题，您应该检查代码并验证正在使用的文件描述符是否有效且打开。此外，检查可能导致文件描述符意外关闭的任何并发问题。
原文地址:https://blog.csdn.net/sun007700/article/details/134816789
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