Mercurial > hg
view mercurial/exewrapper.c @ 45852:b56feaa9b520
chgserver: backport py3 buffered I/O workarounds from procutil
I've recently switched to new machine and I found chg's stdout is fully
buffered.
Even though chg server is a daemon process, it inherits the environment
where the chg client originally forked the server. This means the server's
stdout might have been wrapped by LineBufferedWrapper. That's why we need
to do wrap/unwrap in both ways.
The "if" condition in _restoreio() looks weird, but I'm not willing to
clean things up because stdio behavior is fundamentally different between
py2 and py3, and py2 support will be dropped anyway.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Tue, 17 Nov 2020 19:29:08 +0900 |
parents | ef7119cd4965 |
children | 825d5a5907b4 |
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/* exewrapper.c - wrapper for calling a python script on Windows Copyright 2012 Adrian Buehlmann <adrian@cadifra.com> and others This software may be used and distributed according to the terms of the GNU General Public License version 2 or any later version. */ #include <Python.h> #include <stdio.h> #include <tchar.h> #include <windows.h> #include "hgpythonlib.h" #ifdef __GNUC__ int strcat_s(char *d, size_t n, const char *s) { return !strncat(d, s, n); } int strcpy_s(char *d, size_t n, const char *s) { return !strncpy(d, s, n); } #define _tcscpy_s strcpy_s #define _tcscat_s strcat_s #define _countof(array) (sizeof(array) / sizeof(array[0])) #endif static TCHAR pyscript[MAX_PATH + 10]; static TCHAR pyhome[MAX_PATH + 10]; static TCHAR pydllfile[MAX_PATH + 10]; int _tmain(int argc, TCHAR *argv[]) { TCHAR *p; int ret; int i; int n; TCHAR **pyargv; WIN32_FIND_DATA fdata; HANDLE hfind; const char *err; HMODULE pydll; void(__cdecl * Py_SetPythonHome)(TCHAR * home); int(__cdecl * Py_Main)(int argc, TCHAR *argv[]); #if PY_MAJOR_VERSION >= 3 Py_LegacyWindowsStdioFlag = 1; #endif if (GetModuleFileName(NULL, pyscript, _countof(pyscript)) == 0) { err = "GetModuleFileName failed"; goto bail; } p = _tcsrchr(pyscript, '.'); if (p == NULL) { err = "malformed module filename"; goto bail; } *p = 0; /* cut trailing ".exe" */ _tcscpy_s(pyhome, _countof(pyhome), pyscript); hfind = FindFirstFile(pyscript, &fdata); if (hfind != INVALID_HANDLE_VALUE) { /* pyscript exists, close handle */ FindClose(hfind); } else { /* file pyscript isn't there, take <pyscript>exe.py */ _tcscat_s(pyscript, _countof(pyscript), _T("exe.py")); } pydll = NULL; p = _tcsrchr(pyhome, _T('\\')); if (p == NULL) { err = "can't find backslash in module filename"; goto bail; } *p = 0; /* cut at directory */ /* check for private Python of HackableMercurial */ _tcscat_s(pyhome, _countof(pyhome), _T("\\hg-python")); hfind = FindFirstFile(pyhome, &fdata); if (hfind != INVALID_HANDLE_VALUE) { /* Path .\hg-python exists. We are probably in HackableMercurial scenario, so let's load python dll from this dir. */ FindClose(hfind); _tcscpy_s(pydllfile, _countof(pydllfile), pyhome); _tcscat_s(pydllfile, _countof(pydllfile), _T("\\") _T(HGPYTHONLIB) _T(".dll")); pydll = LoadLibrary(pydllfile); if (pydll == NULL) { err = "failed to load private Python DLL " HGPYTHONLIB ".dll"; goto bail; } Py_SetPythonHome = (void *)GetProcAddress(pydll, "Py_SetPythonHome"); if (Py_SetPythonHome == NULL) { err = "failed to get Py_SetPythonHome"; goto bail; } Py_SetPythonHome(pyhome); } if (pydll == NULL) { pydll = LoadLibrary(_T(HGPYTHONLIB) _T(".dll")); if (pydll == NULL) { err = "failed to load Python DLL " HGPYTHONLIB ".dll"; goto bail; } } Py_Main = (void *)GetProcAddress(pydll, "Py_Main"); if (Py_Main == NULL) { err = "failed to get Py_Main"; goto bail; } /* Only add the pyscript to the args, if it's not already there. It may already be there, if the script spawned a child process of itself, in the same way as it got called, that is, with the pyscript already in place. So we optionally accept the pyscript as the first argument (argv[1]), letting our exe taking the role of the python interpreter. */ if (argc >= 2 && _tcscmp(argv[1], pyscript) == 0) { /* pyscript is already in the args, so there is no need to copy the args and we can directly call the python interpreter with the original args. */ return Py_Main(argc, argv); } /* Start assembling the args for the Python interpreter call. We put the name of our exe (argv[0]) in the position where the python.exe canonically is, and insert the pyscript next. */ pyargv = malloc((argc + 5) * sizeof(TCHAR *)); if (pyargv == NULL) { err = "not enough memory"; goto bail; } n = 0; pyargv[n++] = argv[0]; pyargv[n++] = pyscript; /* copy remaining args from the command line */ for (i = 1; i < argc; i++) pyargv[n++] = argv[i]; /* argv[argc] is guaranteed to be NULL, so we forward that guarantee */ pyargv[n] = NULL; ret = Py_Main(n, pyargv); /* The Python interpreter call */ free(pyargv); return ret; bail: fprintf(stderr, "abort: %s\n", err); return 255; }