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Flush libc stdout/stderr in suppress_stdout_stderr #2015

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Flush libc stdout/stderr in suppress_stdout_stderr #2015

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15 changes: 15 additions & 0 deletions llama_cpp/_utils.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import os
import sys
import ctypes

from typing import Any, Dict

Expand All @@ -16,6 +17,14 @@ class suppress_stdout_stderr(object):
# this context manager inside of a __del__ method
sys = sys
os = os
libc = ctypes.CDLL(None)
try:
c_stdout = ctypes.c_void_p.in_dll(libc, "stdout")
c_stderr = ctypes.c_void_p.in_dll(libc, "stderr")
except:
# macOS
c_stdout = ctypes.c_void_p.in_dll(libc, "__stdoutp")
c_stderr = ctypes.c_void_p.in_dll(libc, "__stderrp")

def __init__(self, disable: bool = True):
self.disable = disable
Expand All @@ -25,6 +34,9 @@ def __enter__(self):
if self.disable:
return self

self.libc.fflush(self.c_stdout)
self.libc.fflush(self.c_stderr)

self.old_stdout_fileno_undup = STDOUT_FILENO
self.old_stderr_fileno_undup = STDERR_FILENO

Expand All @@ -45,6 +57,9 @@ def __exit__(self, *_):
if self.disable:
return

self.libc.fflush(self.c_stdout)
self.libc.fflush(self.c_stderr)

# Check if sys.stdout and sys.stderr have fileno method
self.sys.stdout = self.old_stdout
self.sys.stderr = self.old_stderr
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