Python os.dup2() Method
Example
Duplicate a file descriptor to a given value:
# import os Library
import os
# open file
fd = os.open( "file.txt",
os.O_RDWR|os.O_CREAT )
# Print value of file descriptor
print("Original file descriptor:", fd)
# Duplicate file descriptor
dup_fd = 9
os.dup2(fd, dup_fd)
# Print value of duplicate
file descriptor
print("Duplicated file descriptor:", dup_fd)
#
Close file descriptors
os.close(fd)
os.close(dup_fd)
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Definition and Usage
The os.dup2() duplicates a file descriptor (fd) to
a given value (fd2).
Syntax
os.dup2(fd, fd2, inheritable)
Parameter Values
| Parameter | Description | |
|---|---|---|
| fd | Required. The file descriptor to be duplicated | |
| fd2 | Required. The duplicate value of file descriptor | |
| inheritable | Optional. True means that the duplicated file descriptor is inheritable by child processes. False makes it non-inheritable. Default value is True |
Technical Details
| Return Value: | A int value, representing fd2.
Returns -1 on failure.
|
|---|---|
| Python Version: | 2.6 |
| Change Log: | 3.4: Added inheritable parameter 3.7: Now returns fd2 on success. Previously, None was returned |
