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Win32: Add test for stderr buffering mode

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Verify that stderr is not fully-buffered.

CRTs before the Unversal CRT can open stderr in full buffering
mode (depending on the output type). That's not desirable and
we have a workaround in app_profile_dep.
This commit is contained in:
Luca Bacci
2025-11-14 16:08:41 +01:00
parent e37fb2a398
commit 2d9fc41586
1 changed files with 36 additions and 0 deletions
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36
glib/tests/win32.c
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@@ -138,6 +138,39 @@ test_clear_com (void)
CoUninitialize ();
}
static void
test_subprocess_stderr_buffering_mode (void)
{
int ret = fprintf (stderr, "hello world\n");
g_assert_cmpint (ret, >, 0);
/* We want to exit without flushing stdio streams. We could
* use _Exit here, but the C standard doesn't specify whether
* _Exit flushes stdio streams or not.
* The Windows C RunTime library doesn't flush streams, but
* we should not rely on implementation details which may
* change in the future. Use TerminateProcess.
*/
TerminateProcess (GetCurrentProcess (), 0);
}
static void
test_stderr_buffering_mode (void)
{
/* MSVCRT.DLL can open stderr in full-buffering mode.
* This can cause loss of important messages before
* a crash. Additionally, POSIX disallows full buffering
* of stderr, so this is not good for portability.
* We have a workaround in the app-profile dependency
* that we add to each executable.
*/
g_test_trap_subprocess ("/win32/subprocess/stderr-buffering-mode",
0,
G_TEST_SUBPROCESS_DEFAULT);
g_test_trap_assert_passed ();
g_test_trap_assert_stderr ("hello world?\n");
}
int
main (int argc,
char *argv[])
@@ -161,5 +194,8 @@ main (int argc,
g_test_add_func ("/win32/subprocess/illegal_instruction", test_illegal_instruction);
g_test_add_func ("/win32/com/clear", test_clear_com);
g_test_add_func ("/win32/subprocess/stderr-buffering-mode", test_subprocess_stderr_buffering_mode);
g_test_add_func ("/win32/stderr-buffering-mode", test_stderr_buffering_mode);
return g_test_run();
}