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cpython/PC/w9xpopen.c

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/*
* w9xpopen.c
*
* Serves as an intermediate stub Win32 console application to
* avoid a hanging pipe when redirecting 16-bit console based
* programs (including MS-DOS console based programs and batch
* files) on Window 95 and Windows 98.
*
* This program is to be launched with redirected standard
* handles. It will launch the command line specified 16-bit
* console based application in the same console, forwarding
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* its own redirected standard handles to the 16-bit child.
* AKA solution to the problem described in KB: Q150956.
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <stdlib.h> /* for malloc and its friends */
const char *usage =
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"This program is used by Python's os.popen function\n"
"to work around a limitation in Windows 95/98. It is\n"
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"not designed to be used as a stand-alone program.";
int main(int argc, char *argv[])
{
BOOL bRet;
STARTUPINFO si;
PROCESS_INFORMATION pi;
DWORD exit_code=0;
Merged revisions 61834,61841-61842,61851-61853,61863-61864,61869-61870,61874,61889 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r61834 | raymond.hettinger | 2008-03-24 07:07:49 +0100 (Mon, 24 Mar 2008) | 1 line Tighten documentation for Random.triangular. ........ r61841 | raymond.hettinger | 2008-03-24 09:17:39 +0100 (Mon, 24 Mar 2008) | 1 line Issue 2460: Make Ellipsis objects copyable. ........ r61842 | georg.brandl | 2008-03-24 10:34:34 +0100 (Mon, 24 Mar 2008) | 2 lines #1700821: add a note to audioop docs about signedness of sample formats. ........ r61851 | christian.heimes | 2008-03-24 20:57:42 +0100 (Mon, 24 Mar 2008) | 1 line Added quick hack for bzr ........ r61852 | christian.heimes | 2008-03-24 20:58:17 +0100 (Mon, 24 Mar 2008) | 1 line Added quick hack for bzr ........ r61853 | amaury.forgeotdarc | 2008-03-24 22:04:10 +0100 (Mon, 24 Mar 2008) | 4 lines Issue2469: Correct a typo I introduced at r61793: compilation error with UCS4 builds. All buildbots compile with UCS2... ........ r61863 | neal.norwitz | 2008-03-25 05:17:38 +0100 (Tue, 25 Mar 2008) | 2 lines Fix a bunch of UnboundLocalErrors when the tests fail. ........ r61864 | neal.norwitz | 2008-03-25 05:18:18 +0100 (Tue, 25 Mar 2008) | 2 lines Try to fix a bunch of compiler warnings on Win64. ........ r61869 | neal.norwitz | 2008-03-25 07:35:10 +0100 (Tue, 25 Mar 2008) | 3 lines Don't try to close a non-open file. Don't let file removal cause the test to fail. ........ r61870 | neal.norwitz | 2008-03-25 08:00:39 +0100 (Tue, 25 Mar 2008) | 7 lines Try to get this test to be more stable: * disable gc during the test run because we are spawning objects and there was an exception when calling Popen.__del__ * Always set an alarm handler so the process doesn't exit if the test fails (should probably add assertions on the value of hndl_called in more places) * Using a negative time causes Linux to treat it as zero, so disable that test. ........ r61874 | gregory.p.smith | 2008-03-25 08:31:28 +0100 (Tue, 25 Mar 2008) | 2 lines Use a 32-bit unsigned int here, a long is not needed. ........ r61889 | georg.brandl | 2008-03-25 12:59:51 +0100 (Tue, 25 Mar 2008) | 2 lines Move declarations to block start. ........
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size_t cmdlen = 0;
int i;
char *cmdline, *cmdlinefill;
if (argc < 2) {
if (GetFileType(GetStdHandle(STD_INPUT_HANDLE))==FILE_TYPE_CHAR)
/* Attached to a console, and therefore not executed by Python
Display a message box for the inquisitive user
*/
MessageBox(NULL, usage, argv[0], MB_OK);
else {
/* Eeek - executed by Python, but args are screwed!
Write an error message to stdout so there is at
least some clue for the end user when it appears
in their output.
A message box would be hidden and blocks the app.
*/
fprintf(stdout, "Internal popen error - no args specified\n%s\n", usage);
}
return 1;
}
/* Build up the command-line from the args.
Args with a space are quoted, existing quotes are escaped.
To keep things simple calculating the buffer size, we assume
every character is a quote - ie, we allocate double what we need
in the worst case. As this is only double the command line passed
to us, there is a good chance this is reasonably small, so the total
allocation will almost always be < 512 bytes.
*/
for (i=1;i<argc;i++)
cmdlen += strlen(argv[i])*2 + 3; /* one space, maybe 2 quotes */
cmdline = cmdlinefill = (char *)malloc(cmdlen+1);
if (cmdline == NULL)
return -1;
for (i=1;i<argc;i++) {
const char *arglook;
int bQuote = strchr(argv[i], ' ') != NULL;
if (bQuote)
*cmdlinefill++ = '"';
/* escape quotes */
for (arglook=argv[i];*arglook;arglook++) {
if (*arglook=='"')
*cmdlinefill++ = '\\';
*cmdlinefill++ = *arglook;
}
if (bQuote)
*cmdlinefill++ = '"';
*cmdlinefill++ = ' ';
}
*cmdlinefill = '\0';
/* Make child process use this app's standard files. */
ZeroMemory(&si, sizeof si);
si.cb = sizeof si;
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
bRet = CreateProcess(
NULL, cmdline,
NULL, NULL,
TRUE, 0,
NULL, NULL,
&si, &pi
);
free(cmdline);
if (bRet) {
if (WaitForSingleObject(pi.hProcess, INFINITE) != WAIT_FAILED) {
GetExitCodeProcess(pi.hProcess, &exit_code);
}
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return exit_code;
}
return 1;
}