From ceed94872fb31e766d97426cb05b244782794f84 Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Mon, 20 May 2024 06:37:22 +0200
Subject: Revert "add a splice syscall wrapper"

os.splice from Python >= 3.10 is good enough.

This reverts commit 056c1f964f55adedc17f8d7bddef1f48c73852c7.
---
 linuxnamespaces/syscalls.py | 52 ---------------------------------------------
 1 file changed, 52 deletions(-)

diff --git a/linuxnamespaces/syscalls.py b/linuxnamespaces/syscalls.py
index 9d2b1ba..dd4a332 100644
--- a/linuxnamespaces/syscalls.py
+++ b/linuxnamespaces/syscalls.py
@@ -352,16 +352,6 @@ class PrctlOption(enum.IntEnum):
     PR_CAP_AMBIENT = 47
 
 
-class SpliceFlags(enum.IntFlag):
-    """This value may be supplied to splice(2) as flags."""
-
-    NONE = 0
-    MOVE = 1
-    NONBLOCK = 2
-    MORE = 4
-    GIFT = 8
-
-
 class UmountFlags(enum.IntFlag):
     """This value may be supplied to umount2(2) as flags."""
 
@@ -696,48 +686,6 @@ def setns(fd: int, nstype: CloneFlags = CloneFlags.NONE) -> None:
     call_libc("setns", fd, int(nstype))
 
 
-@dataclasses.dataclass
-class SpliceResult:
-    """Return type for splice(2) capturing out arguments."""
-
-    copied: int
-    off_int: int | None
-    off_out: int | None
-
-
-def splice(
-    fd_in: int,
-    off_in: int | None,
-    fd_out: int,
-    off_out: int | None,
-    length: int,
-    flags: SpliceFlags = SpliceFlags.NONE,
-) -> SpliceResult:
-    """Python wrapper for splice(2). Unlike the syscall, the offset arguments
-    are not output arguments. Instead, they're returned as SpliceResult.
-    """
-    if fd_in < 0 or fd_out < 0:
-        raise ValueError("invalid file descriptor")
-    if off_in is None:
-        p_off_in = None
-    else:
-        c_off_in = ctypes.c_int64(off_in)
-        p_off_in = ctypes.byref(c_off_in)
-    if off_out is None:
-        p_off_out = None
-    else:
-        c_off_out = ctypes.c_int64(off_out)
-        p_off_out = ctypes.byref(c_off_out)
-    ret = call_libc(
-        "splice", fd_in, p_off_in, fd_out, p_off_out, length, int(flags)
-    )
-    return SpliceResult(
-        ret,
-        None if off_in is None else c_off_in.value,
-        None if off_out is None else c_off_out.value,
-    )
-
-
 def umount(
     path: PathConvertible, flags: UmountFlags = UmountFlags.NONE
 ) -> None:
-- 
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