Os Io Splice

In this tutorial, you'll learn about How to Fix splice Errors. We cover key concepts, practical examples, and best practices.

Fix splice errors when splice between two fds without knowing pipe buffer limitations.

Quick Fix

Wrong

import os
# splice moves data between two fds via pipe
# Creating pipe every splice operation is expensive

Pipe creation per splice. Reduces benefit. Pipe buffer limited to 16 pages (65536 bytes default).

Right

import os
# Create reusable pipe:
r,w=os.pipe()
# Set pipe size:
os.fcntl(w, os.F_SETPIPE_SZ, 1048576)  # 1MB pipe buffer
in_fd=open('input.bin','rb').fileno()
out_fd=open('output.bin','wb').fileno()
while True:
    n=os.splice(in_fd, None, w, None, 65536, os.SPLICE_F_MOVE)
    if n==0: break
    os.splice(r, None, out_fd, None, n, os.SPLICE_F_MOVE)
os.close(r); os.close(w)

Reusable pipe. 1MB buffer. Files spliced efficiently. No userspace copy.

Prevention

Reuse pipe for multiple splice calls. Set pipe buffer size with F_SETPIPE_SZ.

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