linux打开最大文件数量1,048,576

最新推荐文章于 2025-12-20 15:12:19 发布

原创最新推荐文章于 2025-12-20 15:12:19 发布 · 268 阅读

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本文深入探讨了Linux中文件描述符的概念，包括它们如何从0开始编号，最大值默认为1024，最高可达1048576。解释了负数作为非法文件描述符的标志，以及在函数返回有效文件描述符失败时，使用-1表示错误。

File descriptors are represented by the C int type. Not using a special type is often considered odd, but is, historically, the Unix way. Each Linux process has a maximum number of files that it may open. File descriptors start at 0 and go up to one less than this maximum value. By default, the maximum is 1,024, but it can be configured as high as 1,048,576. Because negative values are not legal file descriptors, −1 is often used to indicate an error from a function that would otherwise return a valid file descriptor.