fix(deepin-os-release): filter RDRAND warnings and improve error handling

- Filter out known RDRAND-related WARNING lines from stderr to prevent
  pollution of stdout when stdout and stderr are merged by CMake.
- Add missing <cstdlib> header for free().
- Close pipe file descriptor when fdopen fails to avoid potential deadlock.
- Wrap write() in a retry loop to handle EINTR and short writes.
- Update SPDX copyright year to 2026.

Author: gitee-zeqi

tools/deepin-os-release/main.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2017 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2017-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -15,6 +15,7 @@
 #include <stdio.h>
 #include <unistd.h> 
 #include <cstring>
+#include <cstdlib>
 
 DCORE_USE_NAMESPACE
 
@@ -28,16 +29,31 @@ class StderrFilterThread : public QThread
     void run() override
     {
         FILE *readEnd = fdopen(m_readFd, "r");
-        if (!readEnd) return;
+        if (!readEnd) {
+            close(m_readFd); // Close unused file descriptors
+            return;
+        }
 
         char *line = nullptr;
         size_t len = 0;
         while (getline(&line, &len, readEnd) != -1) {
             if (strstr(line, "WARNING: CPU random generator seem to be failing") ||
                 strstr(line, "WARNING: RDRND generated:")) {
-                continue; // 丢弃该行
+                continue; // Discard this row
+            }
+            // Use a loop to ensure complete writing
+            size_t total = 0;
+            size_t remaining = strlen(line);
+            const char *buf = line;
+            while (total < remaining) {
+                ssize_t written = write(m_origStderr, buf + total, remaining - total);
+                if (written < 0) {
+                    if (errno == EINTR)
+                        continue; // Interrupted by signal, retry
+                    break; // Other errors, abandon writing
+                }
+                total += written;
             }
-            write(m_origStderr, line, strlen(line));
         }
         free(line);
         fclose(readEnd);
@@ -61,7 +77,7 @@ void printDistributionOrgInfo(DSysInfo::OrgType type) {
 
 int main(int argc, char *argv[])
 {
-    // 设置过滤器
+    // Set filter
     int origStderr = dup(STDERR_FILENO);
     int pipefd[2];
     pipe(pipefd);
@@ -167,8 +183,8 @@ int main(int argc, char *argv[])
         }
     }
 
-    // 清理
-    dup2(origStderr, STDERR_FILENO);  // 恢复 stderr
+    // clean
+    dup2(origStderr, STDERR_FILENO);  // Restore stderr
     close(origStderr);
 
     filterThread->wait();