What is a file descriptor in Linux? What are standard files? What are their descriptors?
时间: 2024-05-25 17:17:45 浏览: 17
A file descriptor in Linux is a unique identifier assigned by the kernel to a file that is opened by a process. It is an integer value that represents the file within the process's context. File descriptors are used to perform various file operations like reading, writing, and closing the file.
Standard files are the default input, output, and error streams that are available to any Linux process. These standard files are:
1. Standard Input (stdin): This is the default input stream that accepts input from the user or another process.
2. Standard Output (stdout): This is the default output stream that displays the output of a process.
3. Standard Error (stderr): This is the default error stream that displays error messages and debug information.
The file descriptors for these standard files are:
1. Standard Input (stdin): 0
2. Standard Output (stdout): 1
3. Standard Error (stderr): 2
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