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std.Build.Step.Run: improve syscalls while running zig test executables

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Previously, each message requires an unseekable error to be returned
from a syscall before proceeding.  Ideally, the code would just pass
around `*std.Io.Writer` instead of `std.Io.File` in the first place, but
even then, you could argue for saving a syscall with `writerStreaming`.
This commit is contained in:
Jacob Young
2026-03-24 06:23:56 -04:00
committed by Andrew Kelley
parent 49fa67d826
commit 49a258c0e0
1 changed files with 4 additions and 4 deletions
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lib/std/Build/Step/Run.zig
+4 -4
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@@ -2126,7 +2126,7 @@ fn sendMessage(io: Io, file: Io.File, tag: std.zig.Client.Message.Tag) !void {
.tag = tag,
.bytes_len = 0,
};
var w = file.writer(io, &.{});
var w = file.writerStreaming(io, &.{});
w.interface.writeStruct(header, .little) catch |err| switch (err) {
error.WriteFailed => return w.err.?,
};
@@ -2137,7 +2137,7 @@ fn sendRunTestMessage(io: Io, file: Io.File, tag: std.zig.Client.Message.Tag, in
.tag = tag,
.bytes_len = 4,
};
var w = file.writer(io, &.{});
var w = file.writerStreaming(io, &.{});
w.interface.writeStruct(header, .little) catch |err| switch (err) {
error.WriteFailed => return w.err.?,
};
@@ -2157,7 +2157,7 @@ fn sendRunFuzzTestMessage(
.tag = .start_fuzzing,
.bytes_len = 4 + 1 + 8,
};
var w = file.writer(io, &.{});
var w = file.writerStreaming(io, &.{});
w.interface.writeStruct(header, .little) catch |err| switch (err) {
error.WriteFailed => return w.err.?,
};
@@ -2202,7 +2202,7 @@ fn evalGeneric(run: *Run, spawn_options: process.SpawnOptions) !EvalGenericResul
var read_buffer: [1024]u8 = undefined;
var file_reader = file.reader(io, &read_buffer);
var write_buffer: [1024]u8 = undefined;
var stdin_writer = child.stdin.?.writer(io, &write_buffer);
var stdin_writer = child.stdin.?.writerStreaming(io, &write_buffer);
_ = stdin_writer.interface.sendFileAll(&file_reader, .unlimited) catch |err| switch (err) {
error.ReadFailed => return run.step.fail("failed to read from {f}: {t}", .{
path, file_reader.err.?,