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gspawn-win32: Provide thread-safe wrappers for _wspawn*e functions

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_wspawn*e functions are not thread safe on the MSVCRT.dll and
the pre-2015 MSVC runtime DLLs (msvcrXXX.dll).
This commit is contained in:
Luca Bacci 2022-07-28 17:14:19 +02:00
parent 0cb43a4965
commit 477ff949e1
1 changed files with 54 additions and 3 deletions
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57
glib/gspawn-win32.c
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@ -64,6 +64,10 @@
#include <direct.h>
#include <wchar.h>
#ifdef _MSC_VER
#include <vcruntime.h> /* for _UCRT */
#endif
#ifndef GSPAWN_HELPER
#ifdef G_SPAWN_WIN32_DEBUG
static int debug = 1;
@ -117,6 +121,53 @@ enum {
#define HELPER_PROCESS "gspawn-win32-helper"
#endif
#ifndef _UCRT
/* The wspawn*e functions are thread-safe only in the Universal
* CRT (UCRT). If we are linking against the MSVCRT.dll or the
* pre-2015 MSVC runtime (MSVCRXXX.dll), then we have to use a
* mutex.
*/
static GMutex safe_wspawn_e_mutex;
static intptr_t
safe_wspawnve (int _Mode,
const wchar_t *_Filename,
const wchar_t *const *_ArgList,
const wchar_t *const *_Env)
{
intptr_t ret_val = -1;
g_mutex_lock (&safe_wspawn_e_mutex);
ret_val = _wspawnve (_Mode, _Filename, _ArgList, _Env);
g_mutex_unlock (&safe_wspawn_e_mutex);
return ret_val;
}
static intptr_t
safe_wspawnvpe (int _Mode,
const wchar_t *_Filename,
const wchar_t *const *_ArgList,
const wchar_t *const *_Env)
{
intptr_t ret_val = -1;
g_mutex_lock (&safe_wspawn_e_mutex);
ret_val = _wspawnvpe (_Mode, _Filename, _ArgList, _Env);
g_mutex_unlock (&safe_wspawn_e_mutex);
return ret_val;
}
#else
#define safe_wspawnve _spawnve
#define safe_wspawnvpe _wspawnvpe
#endif /* _UCRT */
/* This logic has a copy for wchar_t in gspawn-win32-helper.c, protect_wargv() */
static gchar *
protect_argv_string (const gchar *string)
@ -489,12 +540,12 @@ do_spawn_directly (gint *exit_status,
if (flags & G_SPAWN_SEARCH_PATH)
if (wenvp != NULL)
rc = _wspawnvpe (mode, wargv0, (const wchar_t **) wargv, (const wchar_t **) wenvp);
rc = safe_wspawnvpe (mode, wargv0, (const wchar_t **) wargv, (const wchar_t **) wenvp);
else
rc = _wspawnvp (mode, wargv0, (const wchar_t **) wargv);
else
if (wenvp != NULL)
rc = _wspawnve (mode, wargv0, (const wchar_t **) wargv, (const wchar_t **) wenvp);
rc = safe_wspawnve (mode, wargv0, (const wchar_t **) wargv, (const wchar_t **) wenvp);
else
rc = _wspawnv (mode, wargv0, (const wchar_t **) wargv);
@ -833,7 +884,7 @@ fork_exec (gint *exit_status,
g_free (helper_process);
if (wenvp != NULL)
rc = _wspawnvpe (P_NOWAIT, whelper, (const wchar_t **) wargv, (const wchar_t **) wenvp);
rc = safe_wspawnvpe (P_NOWAIT, whelper, (const wchar_t **) wargv, (const wchar_t **) wenvp);
else
rc = _wspawnvp (P_NOWAIT, whelper, (const wchar_t **) wargv);