From cb5530c864d89f7f4be5ff05c3288777d3db9e4a Mon Sep 17 00:00:00 2001
From: "andrey.bychkov" <andrey@signalmodelling.ru>
Date: Wed, 5 Aug 2026 23:21:36 +0300
Subject: [PATCH] fix: writePipe loses data on partial write > PIPE_BUF

---
 libs/main/system/piprocess.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/libs/main/system/piprocess.cpp b/libs/main/system/piprocess.cpp
index 115b9a69..005b56cc 100644
--- a/libs/main/system/piprocess.cpp
+++ b/libs/main/system/piprocess.cpp
@@ -242,7 +242,16 @@ PRIVATE_DEFINITION_START(PIProcess)
 		BOOL ok = WriteFile(pipes[StdIn][PipeWrite], data.data(), data.size(), &sz, NULL);
 		if (!ok) sz = 0;
 #  else
-		sz = ::write(pipes[StdIn][PipeWrite], data.data(), data.size());
+		size_t offset = 0;
+		while (offset < data.size()) {
+			ssize_t wr = ::write(pipes[StdIn][PipeWrite], data.data() + offset, data.size() - offset);
+			if (wr < 0) {
+				if (errno == EINTR) continue;
+				return false;
+			}
+			offset += wr;
+		}
+		sz = offset;
 #  endif
 		return sz == (SizeType)data.size_s();
 	}