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#ifndef lint |
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static char RCSid[]="$Id: win_process.c,v 3.12 2016/03/06 01:13:17 schorsch Exp $"; |
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#endif |
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/* |
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* Routines to communicate with separate process via dual pipes. |
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* Windows version. |
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* |
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* External symbols declared in standard.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#define STRICT |
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#include <windows.h> /* typedefs */ |
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#include <io.h> /* _open_osfhandle */ |
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#include <fcntl.h> /* _O_XXX */ |
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|
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#include "rterror.h" |
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#include "rtio.h" |
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#include "rtprocess.h" |
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|
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|
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int |
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win_nice(int inc) /* simple nice(2) replacement for Windows */ |
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{ |
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/* We don't have much granularity available: IDLE_PRIORITY_CLASS |
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will run whenever no other higher priority process is running */ |
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if (inc > 0) { |
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return (int)!SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS); |
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} |
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return 0; |
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} |
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|
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|
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/* |
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Safely terminate a process by creating a remote thread |
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in the process that calls ExitProcess. |
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As presented by Andrew Tucker in Windows Developer Magazine. |
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*/ |
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BOOL SafeTerminateProcess(HANDLE hProcess, UINT uExitCode) |
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{ |
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DWORD dwTID, dwCode, dwErr = 0; |
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HANDLE hProcessDup = INVALID_HANDLE_VALUE; |
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HANDLE hRT = NULL; |
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HINSTANCE hKernel = GetModuleHandle("Kernel32"); |
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BOOL bSuccess = FALSE; |
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|
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BOOL bDup = DuplicateHandle(GetCurrentProcess(), |
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hProcess, |
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GetCurrentProcess(), |
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&hProcessDup, |
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PROCESS_ALL_ACCESS, |
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FALSE, |
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0); |
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/* Detect the special case where the process is already dead... */ |
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if ( GetExitCodeProcess((bDup) ? hProcessDup : hProcess, &dwCode) && |
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(dwCode == STILL_ACTIVE) ) { |
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FARPROC pfnExitProc; |
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pfnExitProc = GetProcAddress(hKernel, "ExitProcess"); |
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hRT = CreateRemoteThread((bDup) ? hProcessDup : hProcess, |
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NULL, |
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0, |
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(LPTHREAD_START_ROUTINE)pfnExitProc, |
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(PVOID)uExitCode, 0, &dwTID); |
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if ( hRT == NULL ) dwErr = GetLastError(); |
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} else { |
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dwErr = ERROR_PROCESS_ABORTED; |
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} |
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if ( hRT ) { |
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/* Must wait process to terminate to guarantee that it has exited... */ |
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WaitForSingleObject((bDup) ? hProcessDup : hProcess, INFINITE); |
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CloseHandle(hRT); |
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bSuccess = TRUE; |
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} |
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if ( bDup ) CloseHandle(hProcessDup); |
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if ( !bSuccess ) SetLastError(dwErr); |
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return bSuccess; |
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} |
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|
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|
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static int |
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start_process(SUBPROC *proc, char *cmdstr) |
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{ |
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BOOL res; |
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int Pflags = 0; |
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SECURITY_ATTRIBUTES SAttrs; |
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STARTUPINFO SInfo; |
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PROCESS_INFORMATION PInfo; |
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/* welcome to the world of resource handles */ |
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HANDLE hToChildRead = NULL; |
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HANDLE hToChildWrite = NULL; |
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HANDLE hFromChildRead = NULL; |
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HANDLE hFromChildWrite = NULL; |
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HANDLE hRead = NULL, hWrite = NULL; |
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HANDLE hStdIn, hStdOut, hStdErr; |
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HANDLE hCurProc; |
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|
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/* get process and standard stream handles */ |
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hCurProc = GetCurrentProcess(); |
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hStdIn = GetStdHandle(STD_INPUT_HANDLE); |
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hStdOut = GetStdHandle(STD_OUTPUT_HANDLE); |
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hStdErr = GetStdHandle(STD_ERROR_HANDLE); |
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|
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/* the remote pipe handles must be inheritable */ |
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SAttrs.bInheritHandle = 1; |
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SAttrs.lpSecurityDescriptor = NULL; |
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SAttrs.nLength = sizeof(SECURITY_ATTRIBUTES); |
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|
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/* make pipe, assign to stdout */ |
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/* we'll check for errors after CreateProcess()...*/ |
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res = CreatePipe(&hFromChildRead, &hFromChildWrite, &SAttrs, 0); |
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res = SetStdHandle(STD_OUTPUT_HANDLE, hFromChildWrite); |
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/* create non-inheritable dup of local end */ |
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res = DuplicateHandle(hCurProc, hFromChildRead, hCurProc, &hRead, |
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0, FALSE, DUPLICATE_SAME_ACCESS); |
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CloseHandle(hFromChildRead); hFromChildRead = NULL; |
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|
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res = CreatePipe(&hToChildRead, &hToChildWrite, &SAttrs, 0); |
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res = SetStdHandle(STD_INPUT_HANDLE, hToChildRead); |
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res = DuplicateHandle(hCurProc, hToChildWrite, hCurProc, &hWrite, |
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0, FALSE, DUPLICATE_SAME_ACCESS); |
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CloseHandle(hToChildWrite); hToChildWrite = NULL; |
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|
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CloseHandle(hCurProc); hCurProc = NULL; |
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|
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/* do some bookkeeping for Windows... */ |
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SInfo.cb = sizeof(STARTUPINFO); |
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SInfo.lpReserved = NULL; |
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SInfo.lpDesktop = NULL; |
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SInfo.lpTitle = NULL; |
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SInfo.cbReserved2 = 0; |
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SInfo.lpReserved2 = NULL; |
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/* don't open a console automatically, pass handles */ |
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SInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES; |
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SInfo.wShowWindow = SW_HIDE; |
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SInfo.hStdInput = hToChildRead; |
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SInfo.hStdOutput = hFromChildWrite; |
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SInfo.hStdError = hStdErr; /* reuse original stderr */ |
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|
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res = CreateProcess(NULL, /* command name */ |
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cmdstr, /* full command line */ |
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NULL, /* default process attributes */ |
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NULL, /* default security attributes */ |
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1, /* inherit handles (pass doesn't work reliably) */ |
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Pflags, /* process flags */ |
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NULL, /* no new environment */ |
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NULL, /* stay in current directory */ |
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&SInfo, |
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&PInfo |
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); |
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/* reset stdin/stdout in any case */ |
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SetStdHandle(STD_OUTPUT_HANDLE, hStdOut); |
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SetStdHandle(STD_INPUT_HANDLE, hStdIn); |
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/* Oops... */ |
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if(res == 0) { |
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char es[128]; |
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_snprintf(es, sizeof(es), |
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"Error creating process (%d)\n", GetLastError()); |
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eputs(es); |
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goto error; |
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} |
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/* close stuff we don't need */ |
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CloseHandle(PInfo.hThread); |
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CloseHandle(hFromChildWrite); hFromChildWrite = NULL; |
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CloseHandle(hToChildRead); hToChildRead = NULL; |
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/* get the file descriptors */ |
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proc->r = _open_osfhandle((long)hRead, _O_RDONLY|_O_BINARY); |
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proc->w = _open_osfhandle((long)hWrite, _O_APPEND|_O_BINARY); |
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proc->pid = PInfo.dwProcessId; |
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proc->running = 1; |
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CloseHandle(hCurProc); |
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/* Windows doesn't tell us the actual buffer size */ |
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return PIPE_BUF; |
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|
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error: /* cleanup */ |
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if(PInfo.hThread) CloseHandle(PInfo.hThread); |
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if(hToChildRead) CloseHandle(hToChildRead); |
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if(hToChildWrite) CloseHandle(hToChildWrite); |
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if(hFromChildRead) CloseHandle(hFromChildRead); |
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if(hFromChildWrite) CloseHandle(hFromChildWrite); |
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if(hRead) CloseHandle(hRead); |
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if(hWrite) CloseHandle(hWrite); |
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if(hCurProc) CloseHandle(hCurProc); |
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proc->running = 0; |
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return -1; |
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/* There... Are we happy now? */ |
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} |
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|
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|
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static size_t /* copied size or -1 on error */ |
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wordncopy( /* copy (quoted) src to dest. */ |
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|
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char * dest, |
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char * src, |
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size_t dlen, |
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int insert_space, /* prepend a space */ |
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int force_dq /* turn 'src' into "dest" (for Win command line) */ |
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) |
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{ |
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size_t slen; |
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size_t pos = 0; |
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|
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slen = strlen(src); |
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if (insert_space) { |
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if (1 >= dlen) return -1; |
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dest[pos++] = ' '; |
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} |
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if (strpbrk(src, " \f\n\r\t\v")) { |
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if (force_dq && src[0] == '\'' && src[slen-1] == '\'') { |
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if (slen + pos + 1 > dlen) return -1; |
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dest[pos++] = '"'; |
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strncpy(dest + pos, src + 1, slen -2); |
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pos += slen - 2; |
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dest[pos++] = '"'; |
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} else if (src[0] == '"' && src[slen-1] == '"') { |
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if (slen + pos + 1 > dlen) return -1; |
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strncpy(dest + pos, src, slen); |
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pos += slen; |
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} else { |
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if (slen + pos + 3 > dlen) return -1; |
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dest[pos++] = '"'; |
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strncpy(dest + pos, src, slen); |
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pos += slen; |
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dest[pos++] = '"'; |
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} |
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} else { |
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if (slen + pos + 1 > dlen) return -1; |
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strncpy(dest + pos, src, slen); |
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pos += slen; |
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} |
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dest[pos] = '\0'; |
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return pos; |
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} |
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|
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|
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|
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static char * |
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quoted_cmdline( /* compose command line for StartProcess() as static string */ |
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|
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char *cmdpath, /* full path to executable */ |
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char *sl[] /* list of arguments */ |
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) |
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{ |
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static char *cmdstr; |
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static size_t clen; |
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char *newcs; |
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size_t newlen, pos, i, res; |
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|
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newlen = strlen(cmdpath) + 3; /* allow two quotes plus the final \0 */ |
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for (i = 0; sl[i] != NULL; i++) { |
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newlen += strlen(sl[i]) + 3; /* allow two quotes and a space */ |
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} |
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if (cmdstr == NULL) { |
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cmdstr = (char *) malloc(newlen); |
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if (cmdstr == NULL) return NULL; |
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} else if (newlen > clen) { |
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newcs = (char *) realloc(cmdstr, newlen); |
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if (newcs == NULL) return NULL; |
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cmdstr = newcs; |
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} |
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clen = newlen; |
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pos = wordncopy(cmdstr, cmdpath, clen, 0, 1); |
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if (pos < 0) return NULL; |
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for (i = 0; sl[i] != NULL; i++) { |
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res = wordncopy(cmdstr + pos, sl[i], clen - pos, 1, 1); |
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if (res < 0) return NULL; |
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pos += res; |
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} |
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return cmdstr; |
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} |
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|
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|
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int |
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open_process(SUBPROC *proc, char *av[]) |
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{ |
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char *cmdpath; |
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char *cmdstr; |
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|
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if (av == NULL || av[0] == NULL) { |
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fputs("Illegal call to open_process()!\n", stderr); |
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return -1; |
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} |
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proc->pid = 0; |
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proc->running = 0; |
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if (av == NULL) { return -1; } |
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cmdpath = getpath(av[0], getenv("PATH"), X_OK); |
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cmdstr = quoted_cmdline(cmdpath, av+1); |
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if (cmdstr == NULL) { return 0; } |
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return start_process(proc, cmdstr); |
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} |
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|
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|
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int win_kill(RT_PID pid, int sig) /* we ignore sig... */ |
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{ |
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HANDLE hProc; |
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|
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hProc = OpenProcess(SYNCHRONIZE|PROCESS_TERMINATE, FALSE, pid); |
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/* it looks like we want to ignore errors here */ |
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if(hProc != NULL) { |
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SafeTerminateProcess(hProc, 0); |
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CloseHandle(hProc); |
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} |
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return 0; /* XXX we need to figure out more here... */ |
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} |
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|
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|
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int |
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close_processes(SUBPROC pd[], int nproc) { |
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int i, icres, ocres; |
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DWORD pid; |
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|
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for (i = 0; i < nproc; i++) { |
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if (pd[i].running) { |
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ocres = close(pd[i].w); |
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icres = close(pd[i].r); |
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pd[i].running = 0; |
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if(ocres != 0 || icres != 0) { |
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/* something went wrong: enforce infanticide */ |
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/* other than that, it looks like we want to ignore errors */ |
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win_kill(pd[i].pid, 0); |
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} |
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} |
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pd[i].pid = 0; |
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} |
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return 0; /* XXX we need to figure out more here... */ |
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} |
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|
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|
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#ifdef TEST_MODULE |
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int |
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main( int argc, char **argv ) |
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{ |
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SUBPROC proc; |
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FILE *inf, *outf; |
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int res; |
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char ret[1024]; |
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char *command[]= {"word", "gappy word", "\"quoted words\"", "'squoted words'", NULL}; |
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|
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res = open_process(&proc, command) |
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if (res == 0) { |
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printf("open_process() failed with return value 0\n"); |
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return -1; |
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} |
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printf("process opened with return value: %d, pid: %d, r: %d, w: %d\n", |
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res, proc.pid, proc.r, proc.w); |
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inf = fdopen(proc.r, "rb"); |
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outf = fdopen(proc.w, "wb"); |
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fprintf(outf,"0 0 0 0 1 0\n"); |
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fflush(outf); |
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fgets(ret, sizeof(ret), inf); |
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printf("%s\n",ret); |
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close_process(&proc); |
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} |
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#endif |
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|
