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use copy_file_range syscall on linux

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rpkak
2025-08-31 10:56:09 +02:00
committed by Alex Rønne Petersen
parent 6069f908e9
commit bc567312bf
3 changed files with 10 additions and 6 deletions
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2
lib/std/fs/File.zig
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@@ -1967,7 +1967,7 @@ pub const Writer = struct {
const copy_file_range = switch (native_os) { const copy_file_range = switch (native_os) {
.freebsd => std.os.freebsd.copy_file_range, .freebsd => std.os.freebsd.copy_file_range,
.linux => if (std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 })) std.os.linux.wrapped.copy_file_range else {}, .linux => std.os.linux.wrapped.copy_file_range,
else => {}, else => {},
}; };
if (@TypeOf(copy_file_range) != void) cfr: { if (@TypeOf(copy_file_range) != void) cfr: {

4
lib/std/os/linux.zig
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@@ -9802,7 +9802,9 @@ pub const wrapped = struct {
}; };
pub fn copy_file_range(fd_in: fd_t, off_in: ?*i64, fd_out: fd_t, off_out: ?*i64, len: usize, flags: u32) CopyFileRangeError!usize { pub fn copy_file_range(fd_in: fd_t, off_in: ?*i64, fd_out: fd_t, off_out: ?*i64, len: usize, flags: u32) CopyFileRangeError!usize {
const rc = system.copy_file_range(fd_in, off_in, fd_out, off_out, len, flags); const use_c = std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 });
const sys = if (use_c) std.c else std.os.linux;
const rc = sys.copy_file_range(fd_in, off_in, fd_out, off_out, len, flags);
switch (errno(rc)) { switch (errno(rc)) {
.SUCCESS => return @intCast(rc), .SUCCESS => return @intCast(rc),
.BADF => return error.BadFileFlags, .BADF => return error.BadFileFlags,

10
lib/std/posix.zig
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@@ -6387,14 +6387,16 @@ pub const CopyFileRangeError = error{
/// ///
/// Maximum offsets on Linux and FreeBSD are `maxInt(i64)`. /// Maximum offsets on Linux and FreeBSD are `maxInt(i64)`.
pub fn copy_file_range(fd_in: fd_t, off_in: u64, fd_out: fd_t, off_out: u64, len: usize, flags: u32) CopyFileRangeError!usize { pub fn copy_file_range(fd_in: fd_t, off_in: u64, fd_out: fd_t, off_out: u64, len: usize, flags: u32) CopyFileRangeError!usize {
if (builtin.os.tag == .freebsd or if (builtin.os.tag == .freebsd or builtin.os.tag == .linux) {
(comptime builtin.os.tag == .linux and std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 }))) const use_c = native_os != .linux or
{ std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 });
const sys = if (use_c) std.c else linux;
var off_in_copy: i64 = @bitCast(off_in); var off_in_copy: i64 = @bitCast(off_in);
var off_out_copy: i64 = @bitCast(off_out); var off_out_copy: i64 = @bitCast(off_out);
while (true) { while (true) {
const rc = system.copy_file_range(fd_in, &off_in_copy, fd_out, &off_out_copy, len, flags); const rc = sys.copy_file_range(fd_in, &off_in_copy, fd_out, &off_out_copy, len, flags);
if (native_os == .freebsd) { if (native_os == .freebsd) {
switch (errno(rc)) { switch (errno(rc)) {
.SUCCESS => return @intCast(rc), .SUCCESS => return @intCast(rc),