OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.
os.ttyname() method in Python is used to get the terminal device associated with the specified file descriptor.
A file descriptor is small integer value that corresponds to a file or other input/output resource, such as a pipe or network socket. It is an abstract indicator of a resource and act as handle to perform various lower level I/O operations like read, write, send etc.
For Example: Standard input is usually file descriptor with value 0, standard output is usually file descriptor with value 1 and standard error is usually file descriptor with value 2. These file descriptors i.e 0 (stdin), 1 (stdout), and 2 (stderr) are standard file descriptors used by our programs. Further files opened by the current process will get the value 3, 4, 5 an so on.
Note: This method is only available on UNIX platforms and an exception is raised if the specified file descriptor is not associated with any terminal device.
fd: A file descriptor
Return Type: This method returns a string value which represents the terminal device associated with the specified file descriptor fd.
Terminal device associated with: Standard input: /dev/pts/0 Standard output: /dev/pts/0 standard error /dev/pts/0 Master: /dev/ptmx Slave: /dev/pts/1
Code #2: If the specified file descriptor is not associated with any terminal device
Traceback (most recent call last): File "getTerminalDevice.py", line 20, in print(os.ttyname(r)) OSError: [Errno 25] Inappropriate ioctl for device
Code #3: Way to handle the above raised exception
[Errno 25] Inappropriate ioctl for device File descriptor is not associated with any terminal device File descriptor is not associated with any terminal device
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