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exechelp.c
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exechelp.c
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/* exechelp.c - fork and exec helpers
* Copyright (C) 2004, 2007, 2014 g10 Code GmbH
* Copyright (C) 2015 by Bundesamt für Sicherheit in der Informationstechnik
* Software engineering by Intevation GmbH
*
* This file is part of GpgOL.
*
* GpgOL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GpgOL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
#include
<config.h>
#endif
#include
<stdio.h>
#include
<stdlib.h>
#include
<string.h>
#include
<unistd.h>
#include
<windows.h>
#include
<gpg-error.h>
#include
"common.h"
#include
"exechelp.h"
/* Define to 1 do enable debugging. */
#define DEBUG_W32_SPAWN 0
/* Lock a spawning process. The caller needs to provide the address
of a variable to store the lock information and the name or the
process. */
gpg_error_t
gpgol_lock_spawning
(
lock_spawn_t
*
lock
)
{
int
waitrc
;
int
timeout
=
5
;
*
lock
=
CreateMutexW
(
NULL
,
FALSE
,
L
"spawn_gnupg_uiserver_sentinel"
);
if
(
!*
lock
)
{
log_error
(
"failed to create the spawn mutex: rc=%ld"
,
GetLastError
());
return
gpg_error
(
GPG_ERR_GENERAL
);
}
retry
:
waitrc
=
WaitForSingleObject
(
*
lock
,
1000
);
if
(
waitrc
==
WAIT_OBJECT_0
)
return
0
;
if
(
waitrc
==
WAIT_TIMEOUT
&&
timeout
)
{
timeout
--
;
goto
retry
;
}
if
(
waitrc
==
WAIT_TIMEOUT
)
log_error
(
"error waiting for the spawn mutex: timeout"
);
else
log_error
(
"error waiting for the spawn mutex: (code=%d) rc=%ld"
,
waitrc
,
GetLastError
());
return
gpg_error
(
GPG_ERR_GENERAL
);
}
/* Unlock the spawning process. */
void
gpgol_unlock_spawning
(
lock_spawn_t
*
lock
)
{
if
(
*
lock
)
{
if
(
!
ReleaseMutex
(
*
lock
))
log_error
(
"failed to release the spawn mutex: rc=%ld"
,
GetLastError
());
CloseHandle
(
*
lock
);
*
lock
=
NULL
;
}
}
/* Fork and exec the program with /dev/null as stdin, stdout and
stderr. Returns 0 on success or an error code. */
gpg_error_t
gpgol_spawn_detached
(
const
char
*
cmdline
)
{
SECURITY_ATTRIBUTES
sec_attr
;
PROCESS_INFORMATION
pi
=
{
NULL
,
/* Returns process handle. */
0
,
/* Returns primary thread handle. */
0
,
/* Returns pid. */
0
/* Returns tid. */
};
STARTUPINFO
si
;
int
cr_flags
;
log_debug
(
"gpgol_spawn_detached cmdline=%s"
,
cmdline
);
/* Prepare security attributes. */
memset
(
&
sec_attr
,
0
,
sizeof
sec_attr
);
sec_attr
.
nLength
=
sizeof
sec_attr
;
sec_attr
.
bInheritHandle
=
FALSE
;
/* Start the process. Note that we can't run the PREEXEC function
because this would change our own environment. */
memset
(
&
si
,
0
,
sizeof
si
);
si
.
cb
=
sizeof
(
si
);
si
.
dwFlags
=
STARTF_USESHOWWINDOW
;
si
.
wShowWindow
=
DEBUG_W32_SPAWN
?
SW_SHOW
:
SW_MINIMIZE
;
cr_flags
=
(
CREATE_DEFAULT_ERROR_MODE
|
GetPriorityClass
(
GetCurrentProcess
())
|
CREATE_NEW_PROCESS_GROUP
|
DETACHED_PROCESS
);
if
(
!
CreateProcess
(
NULL
,
/* pgmname; Program to start. */
(
char
*
)
cmdline
,
/* Command line arguments. */
&
sec_attr
,
/* Process security attributes. */
&
sec_attr
,
/* Thread security attributes. */
TRUE
,
/* Inherit handles. */
cr_flags
,
/* Creation flags. */
NULL
,
/* Environment. */
NULL
,
/* Use current drive/directory. */
&
si
,
/* Startup information. */
&
pi
/* Returns process information. */
))
{
log_error
(
"CreateProcess failed: %ld
\n
"
,
GetLastError
());
return
gpg_error
(
GPG_ERR_GENERAL
);
}
/* Process has been created suspended; resume it now. */
CloseHandle
(
pi
.
hThread
);
CloseHandle
(
pi
.
hProcess
);
return
0
;
}
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Expires
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