/* Copyright Joyent, Inc. and other Node contributors. All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include #include #include #include #include #include #include #include /* alloca */ #include "uv.h" #include "internal.h" #include "handle-inl.h" #include "req-inl.h" #include #include #include /* GetModuleBaseNameW */ #define SIGKILL 9 typedef struct env_var { const WCHAR* const wide; const WCHAR* const wide_eq; const size_t len; /* including null or '=' */ } env_var_t; #define E_V(str) { L##str, L##str L"=", sizeof(str) } static const env_var_t required_vars[] = { /* keep me sorted */ E_V("HOMEDRIVE"), E_V("HOMEPATH"), E_V("LOGONSERVER"), E_V("PATH"), E_V("SYSTEMDRIVE"), E_V("SYSTEMROOT"), E_V("TEMP"), E_V("USERDOMAIN"), E_V("USERNAME"), E_V("USERPROFILE"), E_V("WINDIR"), }; static HANDLE uv_global_job_handle_; static uv_once_t uv_global_job_handle_init_guard_ = UV_ONCE_INIT; static void uv__init_global_job_handle(void) { /* Create a job object and set it up to kill all contained processes when * it's closed. Since this handle is made non-inheritable and we're not * giving it to anyone, we're the only process holding a reference to it. * That means that if this process exits it is closed and all the processes * it contains are killed. All processes created with uv_spawn that are not * spawned with the UV_PROCESS_DETACHED flag are assigned to this job. * * We're setting the JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK flag so only the * processes that we explicitly add are affected, and *their* subprocesses * are not. This ensures that our child processes are not limited in their * ability to use job control on Windows versions that don't deal with * nested jobs (prior to Windows 8 / Server 2012). It also lets our child * processes created detached processes without explicitly breaking away * from job control (which uv_spawn doesn't, either). */ SECURITY_ATTRIBUTES attr; JOBOBJECT_EXTENDED_LIMIT_INFORMATION info; memset(&attr, 0, sizeof attr); attr.bInheritHandle = FALSE; memset(&info, 0, sizeof info); info.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_BREAKAWAY_OK | JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK | JOB_OBJECT_LIMIT_DIE_ON_UNHANDLED_EXCEPTION | JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE; uv_global_job_handle_ = CreateJobObjectW(&attr, NULL); if (uv_global_job_handle_ == NULL) uv_fatal_error(GetLastError(), "CreateJobObjectW"); if (!SetInformationJobObject(uv_global_job_handle_, JobObjectExtendedLimitInformation, &info, sizeof info)) uv_fatal_error(GetLastError(), "SetInformationJobObject"); } static int uv__utf8_to_utf16_alloc(const char* s, WCHAR** ws_ptr) { int ws_len, r; WCHAR* ws; ws_len = MultiByteToWideChar(CP_UTF8, 0, s, -1, NULL, 0); if (ws_len <= 0) { return GetLastError(); } ws = (WCHAR*) uv__malloc(ws_len * sizeof(WCHAR)); if (ws == NULL) { return ERROR_OUTOFMEMORY; } r = MultiByteToWideChar(CP_UTF8, 0, s, -1, ws, ws_len); assert(r == ws_len); *ws_ptr = ws; return 0; } static void uv__process_init(uv_loop_t* loop, uv_process_t* handle) { uv__handle_init(loop, (uv_handle_t*) handle, UV_PROCESS); handle->exit_cb = NULL; handle->pid = 0; handle->exit_signal = 0; handle->wait_handle = INVALID_HANDLE_VALUE; handle->process_handle = INVALID_HANDLE_VALUE; handle->exit_cb_pending = 0; UV_REQ_INIT(&handle->exit_req, UV_PROCESS_EXIT); handle->exit_req.data = handle; } /* * Path search functions */ /* * Helper function for search_path */ static WCHAR* search_path_join_test(const WCHAR* dir, size_t dir_len, const WCHAR* name, size_t name_len, const WCHAR* ext, size_t ext_len, const WCHAR* cwd, size_t cwd_len) { WCHAR *result, *result_pos; DWORD attrs; if (dir_len > 2 && ((dir[0] == L'\\' || dir[0] == L'/') && (dir[1] == L'\\' || dir[1] == L'/'))) { /* It's a UNC path so ignore cwd */ cwd_len = 0; } else if (dir_len >= 1 && (dir[0] == L'/' || dir[0] == L'\\')) { /* It's a full path without drive letter, use cwd's drive letter only */ cwd_len = 2; } else if (dir_len >= 2 && dir[1] == L':' && (dir_len < 3 || (dir[2] != L'/' && dir[2] != L'\\'))) { /* It's a relative path with drive letter (ext.g. D:../some/file) * Replace drive letter in dir by full cwd if it points to the same drive, * otherwise use the dir only. */ if (cwd_len < 2 || _wcsnicmp(cwd, dir, 2) != 0) { cwd_len = 0; } else { dir += 2; dir_len -= 2; } } else if (dir_len > 2 && dir[1] == L':') { /* It's an absolute path with drive letter * Don't use the cwd at all */ cwd_len = 0; } /* Allocate buffer for output */ result = result_pos = (WCHAR*)uv__malloc(sizeof(WCHAR) * (cwd_len + 1 + dir_len + 1 + name_len + 1 + ext_len + 1)); /* Copy cwd */ wcsncpy(result_pos, cwd, cwd_len); result_pos += cwd_len; /* Add a path separator if cwd didn't end with one */ if (cwd_len && wcsrchr(L"\\/:", result_pos[-1]) == NULL) { result_pos[0] = L'\\'; result_pos++; } /* Copy dir */ wcsncpy(result_pos, dir, dir_len); result_pos += dir_len; /* Add a separator if the dir didn't end with one */ if (dir_len && wcsrchr(L"\\/:", result_pos[-1]) == NULL) { result_pos[0] = L'\\'; result_pos++; } /* Copy filename */ wcsncpy(result_pos, name, name_len); result_pos += name_len; if (ext_len) { /* Add a dot if the filename didn't end with one */ if (name_len && result_pos[-1] != '.') { result_pos[0] = L'.'; result_pos++; } /* Copy extension */ wcsncpy(result_pos, ext, ext_len); result_pos += ext_len; } /* Null terminator */ result_pos[0] = L'\0'; attrs = GetFileAttributesW(result); if (attrs != INVALID_FILE_ATTRIBUTES && !(attrs & FILE_ATTRIBUTE_DIRECTORY)) { return result; } uv__free(result); return NULL; } /* * Helper function for search_path */ static WCHAR* path_search_walk_ext(const WCHAR *dir, size_t dir_len, const WCHAR *name, size_t name_len, WCHAR *cwd, size_t cwd_len, int name_has_ext) { WCHAR* result; /* If the name itself has a nonempty extension, try this extension first */ if (name_has_ext) { result = search_path_join_test(dir, dir_len, name, name_len, L"", 0, cwd, cwd_len); if (result != NULL) { return result; } } /* Try .com extension */ result = search_path_join_test(dir, dir_len, name, name_len, L"com", 3, cwd, cwd_len); if (result != NULL) { return result; } /* Try .exe extension */ result = search_path_join_test(dir, dir_len, name, name_len, L"exe", 3, cwd, cwd_len); if (result != NULL) { return result; } return NULL; } /* * search_path searches the system path for an executable filename - * the windows API doesn't provide this as a standalone function nor as an * option to CreateProcess. * * It tries to return an absolute filename. * * Furthermore, it tries to follow the semantics that cmd.exe, with this * exception that PATHEXT environment variable isn't used. Since CreateProcess * can start only .com and .exe files, only those extensions are tried. This * behavior equals that of msvcrt's spawn functions. * * - Do not search the path if the filename already contains a path (either * relative or absolute). * * - If there's really only a filename, check the current directory for file, * then search all path directories. * * - If filename specified has *any* extension, search for the file with the * specified extension first. * * - If the literal filename is not found in a directory, try *appending* * (not replacing) .com first and then .exe. * * - The path variable may contain relative paths; relative paths are relative * to the cwd. * * - Directories in path may or may not end with a trailing backslash. * * - CMD does not trim leading/trailing whitespace from path/pathex entries * nor from the environment variables as a whole. * * - When cmd.exe cannot read a directory, it will just skip it and go on * searching. However, unlike posix-y systems, it will happily try to run a * file that is not readable/executable; if the spawn fails it will not * continue searching. * * UNC path support: we are dealing with UNC paths in both the path and the * filename. This is a deviation from what cmd.exe does (it does not let you * start a program by specifying an UNC path on the command line) but this is * really a pointless restriction. * */ static WCHAR* search_path(const WCHAR *file, WCHAR *cwd, const WCHAR *path) { int file_has_dir; WCHAR* result = NULL; WCHAR *file_name_start; WCHAR *dot; const WCHAR *dir_start, *dir_end, *dir_path; size_t dir_len; int name_has_ext; size_t file_len = wcslen(file); size_t cwd_len = wcslen(cwd); /* If the caller supplies an empty filename, * we're not gonna return c:\windows\.exe -- GFY! */ if (file_len == 0 || (file_len == 1 && file[0] == L'.')) { return NULL; } /* Find the start of the filename so we can split the directory from the * name. */ for (file_name_start = (WCHAR*)file + file_len; file_name_start > file && file_name_start[-1] != L'\\' && file_name_start[-1] != L'/' && file_name_start[-1] != L':'; file_name_start--); file_has_dir = file_name_start != file; /* Check if the filename includes an extension */ dot = wcschr(file_name_start, L'.'); name_has_ext = (dot != NULL && dot[1] != L'\0'); if (file_has_dir) { /* The file has a path inside, don't use path */ result = path_search_walk_ext( file, file_name_start - file, file_name_start, file_len - (file_name_start - file), cwd, cwd_len, name_has_ext); } else { dir_end = path; /* The file is really only a name; look in cwd first, then scan path */ result = path_search_walk_ext(L"", 0, file, file_len, cwd, cwd_len, name_has_ext); while (result == NULL) { if (*dir_end == L'\0') { break; } /* Skip the separator that dir_end now points to */ if (dir_end != path || *path == L';') { dir_end++; } /* Next slice starts just after where the previous one ended */ dir_start = dir_end; /* If path is quoted, find quote end */ if (*dir_start == L'"' || *dir_start == L'\'') { dir_end = wcschr(dir_start + 1, *dir_start); if (dir_end == NULL) { dir_end = wcschr(dir_start, L'\0'); } } /* Slice until the next ; or \0 is found */ dir_end = wcschr(dir_end, L';'); if (dir_end == NULL) { dir_end = wcschr(dir_start, L'\0'); } /* If the slice is zero-length, don't bother */ if (dir_end - dir_start == 0) { continue; } dir_path = dir_start; dir_len = dir_end - dir_start; /* Adjust if the path is quoted. */ if (dir_path[0] == '"' || dir_path[0] == '\'') { ++dir_path; --dir_len; } if (dir_path[dir_len - 1] == '"' || dir_path[dir_len - 1] == '\'') { --dir_len; } result = path_search_walk_ext(dir_path, dir_len, file, file_len, cwd, cwd_len, name_has_ext); } } return result; } /* * Quotes command line arguments * Returns a pointer to the end (next char to be written) of the buffer */ WCHAR* quote_cmd_arg(const WCHAR *source, WCHAR *target) { size_t len = wcslen(source); size_t i; int quote_hit; WCHAR* start; if (len == 0) { /* Need double quotation for empty argument */ *(target++) = L'"'; *(target++) = L'"'; return target; } if (NULL == wcspbrk(source, L" \t\"")) { /* No quotation needed */ wcsncpy(target, source, len); target += len; return target; } if (NULL == wcspbrk(source, L"\"\\")) { /* * No embedded double quotes or backlashes, so I can just wrap * quote marks around the whole thing. */ *(target++) = L'"'; wcsncpy(target, source, len); target += len; *(target++) = L'"'; return target; } /* * Expected input/output: * input : hello"world * output: "hello\"world" * input : hello""world * output: "hello\"\"world" * input : hello\world * output: hello\world * input : hello\\world * output: hello\\world * input : hello\"world * output: "hello\\\"world" * input : hello\\"world * output: "hello\\\\\"world" * input : hello world\ * output: "hello world\\" */ *(target++) = L'"'; start = target; quote_hit = 1; for (i = len; i > 0; --i) { *(target++) = source[i - 1]; if (quote_hit && source[i - 1] == L'\\') { *(target++) = L'\\'; } else if(source[i - 1] == L'"') { quote_hit = 1; *(target++) = L'\\'; } else { quote_hit = 0; } } target[0] = L'\0'; wcsrev(start); *(target++) = L'"'; return target; } int make_program_args(char** args, int verbatim_arguments, WCHAR** dst_ptr) { char** arg; WCHAR* dst = NULL; WCHAR* temp_buffer = NULL; size_t dst_len = 0; size_t temp_buffer_len = 0; WCHAR* pos; int arg_count = 0; int err = 0; /* Count the required size. */ for (arg = args; *arg; arg++) { DWORD arg_len; arg_len = MultiByteToWideChar(CP_UTF8, 0, *arg, -1, NULL, 0); if (arg_len == 0) { return GetLastError(); } dst_len += arg_len; if (arg_len > temp_buffer_len) temp_buffer_len = arg_len; arg_count++; } /* Adjust for potential quotes. Also assume the worst-case scenario that * every character needs escaping, so we need twice as much space. */ dst_len = dst_len * 2 + arg_count * 2; /* Allocate buffer for the final command line. */ dst = (WCHAR*) uv__malloc(dst_len * sizeof(WCHAR)); if (dst == NULL) { err = ERROR_OUTOFMEMORY; goto error; } /* Allocate temporary working buffer. */ temp_buffer = (WCHAR*) uv__malloc(temp_buffer_len * sizeof(WCHAR)); if (temp_buffer == NULL) { err = ERROR_OUTOFMEMORY; goto error; } pos = dst; for (arg = args; *arg; arg++) { DWORD arg_len; /* Convert argument to wide char. */ arg_len = MultiByteToWideChar(CP_UTF8, 0, *arg, -1, temp_buffer, (int) (dst + dst_len - pos)); if (arg_len == 0) { err = GetLastError(); goto error; } if (verbatim_arguments) { /* Copy verbatim. */ wcscpy(pos, temp_buffer); pos += arg_len - 1; } else { /* Quote/escape, if needed. */ pos = quote_cmd_arg(temp_buffer, pos); } *pos++ = *(arg + 1) ? L' ' : L'\0'; } uv__free(temp_buffer); *dst_ptr = dst; return 0; error: uv__free(dst); uv__free(temp_buffer); return err; } int env_strncmp(const wchar_t* a, int na, const wchar_t* b) { wchar_t* a_eq; wchar_t* b_eq; wchar_t* A; wchar_t* B; int nb; int r; if (na < 0) { a_eq = wcschr(a, L'='); assert(a_eq); na = (int)(long)(a_eq - a); } else { na--; } b_eq = wcschr(b, L'='); assert(b_eq); nb = b_eq - b; A = alloca((na+1) * sizeof(wchar_t)); B = alloca((nb+1) * sizeof(wchar_t)); r = LCMapStringW(LOCALE_INVARIANT, LCMAP_UPPERCASE, a, na, A, na); assert(r==na); A[na] = L'\0'; r = LCMapStringW(LOCALE_INVARIANT, LCMAP_UPPERCASE, b, nb, B, nb); assert(r==nb); B[nb] = L'\0'; for (;;) { wchar_t AA = *A++; wchar_t BB = *B++; if (AA < BB) { return -1; } else if (AA > BB) { return 1; } else if (!AA && !BB) { return 0; } } } static int qsort_wcscmp(const void *a, const void *b) { wchar_t* astr = *(wchar_t* const*)a; wchar_t* bstr = *(wchar_t* const*)b; return env_strncmp(astr, -1, bstr); } /* * The way windows takes environment variables is different than what C does; * Windows wants a contiguous block of null-terminated strings, terminated * with an additional null. * * Windows has a few "essential" environment variables. winsock will fail * to initialize if SYSTEMROOT is not defined; some APIs make reference to * TEMP. SYSTEMDRIVE is probably also important. We therefore ensure that * these get defined if the input environment block does not contain any * values for them. * * Also add variables known to Cygwin to be required for correct * subprocess operation in many cases: * https://github.com/Alexpux/Cygwin/blob/b266b04fbbd3a595f02ea149e4306d3ab9b1fe3d/winsup/cygwin/environ.cc#L955 * */ int make_program_env(char* env_block[], WCHAR** dst_ptr) { WCHAR* dst; WCHAR* ptr; char** env; size_t env_len = 0; int len; size_t i; DWORD var_size; size_t env_block_count = 1; /* 1 for null-terminator */ WCHAR* dst_copy; WCHAR** ptr_copy; WCHAR** env_copy; DWORD required_vars_value_len[ARRAY_SIZE(required_vars)]; /* first pass: determine size in UTF-16 */ for (env = env_block; *env; env++) { int len; if (strchr(*env, '=')) { len = MultiByteToWideChar(CP_UTF8, 0, *env, -1, NULL, 0); if (len <= 0) { return GetLastError(); } env_len += len; env_block_count++; } } /* second pass: copy to UTF-16 environment block */ dst_copy = (WCHAR*)uv__malloc(env_len * sizeof(WCHAR)); if (dst_copy == NULL && env_len > 0) { return ERROR_OUTOFMEMORY; } env_copy = alloca(env_block_count * sizeof(WCHAR*)); ptr = dst_copy; ptr_copy = env_copy; for (env = env_block; *env; env++) { if (strchr(*env, '=')) { len = MultiByteToWideChar(CP_UTF8, 0, *env, -1, ptr, (int) (env_len - (ptr - dst_copy))); if (len <= 0) { DWORD err = GetLastError(); uv__free(dst_copy); return err; } *ptr_copy++ = ptr; ptr += len; } } *ptr_copy = NULL; assert(env_len == 0 || env_len == (size_t) (ptr - dst_copy)); /* sort our (UTF-16) copy */ qsort(env_copy, env_block_count-1, sizeof(wchar_t*), qsort_wcscmp); /* third pass: check for required variables */ for (ptr_copy = env_copy, i = 0; i < ARRAY_SIZE(required_vars); ) { int cmp; if (!*ptr_copy) { cmp = -1; } else { cmp = env_strncmp(required_vars[i].wide_eq, required_vars[i].len, *ptr_copy); } if (cmp < 0) { /* missing required var */ var_size = GetEnvironmentVariableW(required_vars[i].wide, NULL, 0); required_vars_value_len[i] = var_size; if (var_size != 0) { env_len += required_vars[i].len; env_len += var_size; } i++; } else { ptr_copy++; if (cmp == 0) i++; } } /* final pass: copy, in sort order, and inserting required variables */ dst = uv__malloc((1+env_len) * sizeof(WCHAR)); if (!dst) { uv__free(dst_copy); return ERROR_OUTOFMEMORY; } for (ptr = dst, ptr_copy = env_copy, i = 0; *ptr_copy || i < ARRAY_SIZE(required_vars); ptr += len) { int cmp; if (i >= ARRAY_SIZE(required_vars)) { cmp = 1; } else if (!*ptr_copy) { cmp = -1; } else { cmp = env_strncmp(required_vars[i].wide_eq, required_vars[i].len, *ptr_copy); } if (cmp < 0) { /* missing required var */ len = required_vars_value_len[i]; if (len) { wcscpy(ptr, required_vars[i].wide_eq); ptr += required_vars[i].len; var_size = GetEnvironmentVariableW(required_vars[i].wide, ptr, (int) (env_len - (ptr - dst))); if (var_size != (DWORD) (len - 1)) { /* TODO: handle race condition? */ uv_fatal_error(GetLastError(), "GetEnvironmentVariableW"); } } i++; } else { /* copy var from env_block */ len = wcslen(*ptr_copy) + 1; wmemcpy(ptr, *ptr_copy, len); ptr_copy++; if (cmp == 0) i++; } } /* Terminate with an extra NULL. */ assert(env_len == (size_t) (ptr - dst)); *ptr = L'\0'; uv__free(dst_copy); *dst_ptr = dst; return 0; } /* * Attempt to find the value of the PATH environment variable in the child's * preprocessed environment. * * If found, a pointer into `env` is returned. If not found, NULL is returned. */ static WCHAR* find_path(WCHAR *env) { for (; env != NULL && *env != 0; env += wcslen(env) + 1) { if ((env[0] == L'P' || env[0] == L'p') && (env[1] == L'A' || env[1] == L'a') && (env[2] == L'T' || env[2] == L't') && (env[3] == L'H' || env[3] == L'h') && (env[4] == L'=')) { return &env[5]; } } return NULL; } /* * Called on Windows thread-pool thread to indicate that * a child process has exited. */ static void CALLBACK exit_wait_callback(void* data, BOOLEAN didTimeout) { uv_process_t* process = (uv_process_t*) data; uv_loop_t* loop = process->loop; assert(didTimeout == FALSE); assert(process); assert(!process->exit_cb_pending); process->exit_cb_pending = 1; /* Post completed */ POST_COMPLETION_FOR_REQ(loop, &process->exit_req); } /* Called on main thread after a child process has exited. */ void uv__process_proc_exit(uv_loop_t* loop, uv_process_t* handle) { int64_t exit_code; DWORD status; assert(handle->exit_cb_pending); handle->exit_cb_pending = 0; /* If we're closing, don't call the exit callback. Just schedule a close * callback now. */ if (handle->flags & UV_HANDLE_CLOSING) { uv__want_endgame(loop, (uv_handle_t*) handle); return; } /* Unregister from process notification. */ if (handle->wait_handle != INVALID_HANDLE_VALUE) { UnregisterWait(handle->wait_handle); handle->wait_handle = INVALID_HANDLE_VALUE; } /* Set the handle to inactive: no callbacks will be made after the exit * callback. */ uv__handle_stop(handle); if (GetExitCodeProcess(handle->process_handle, &status)) { exit_code = status; } else { /* Unable to obtain the exit code. This should never happen. */ exit_code = uv_translate_sys_error(GetLastError()); } /* Fire the exit callback. */ if (handle->exit_cb) { handle->exit_cb(handle, exit_code, handle->exit_signal); } } void uv__process_close(uv_loop_t* loop, uv_process_t* handle) { uv__handle_closing(handle); if (handle->wait_handle != INVALID_HANDLE_VALUE) { /* This blocks until either the wait was cancelled, or the callback has * completed. */ BOOL r = UnregisterWaitEx(handle->wait_handle, INVALID_HANDLE_VALUE); if (!r) { /* This should never happen, and if it happens, we can't recover... */ uv_fatal_error(GetLastError(), "UnregisterWaitEx"); } handle->wait_handle = INVALID_HANDLE_VALUE; } if (!handle->exit_cb_pending) { uv__want_endgame(loop, (uv_handle_t*)handle); } } void uv__process_endgame(uv_loop_t* loop, uv_process_t* handle) { assert(!handle->exit_cb_pending); assert(handle->flags & UV_HANDLE_CLOSING); assert(!(handle->flags & UV_HANDLE_CLOSED)); /* Clean-up the process handle. */ CloseHandle(handle->process_handle); uv__handle_close(handle); } int uv_spawn(uv_loop_t* loop, uv_process_t* process, const uv_process_options_t* options) { int i; int err = 0; WCHAR* path = NULL, *alloc_path = NULL; BOOL result; WCHAR* application_path = NULL, *application = NULL, *arguments = NULL, *env = NULL, *cwd = NULL; STARTUPINFOW startup; PROCESS_INFORMATION info; DWORD process_flags; BYTE* child_stdio_buffer; uv__process_init(loop, process); process->exit_cb = options->exit_cb; child_stdio_buffer = NULL; if (options->flags & (UV_PROCESS_SETGID | UV_PROCESS_SETUID)) { return UV_ENOTSUP; } if (options->file == NULL || options->args == NULL) { return UV_EINVAL; } assert(options->file != NULL); assert(!(options->flags & ~(UV_PROCESS_DETACHED | UV_PROCESS_SETGID | UV_PROCESS_SETUID | UV_PROCESS_WINDOWS_HIDE | UV_PROCESS_WINDOWS_HIDE_CONSOLE | UV_PROCESS_WINDOWS_HIDE_GUI | UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS))); err = uv__utf8_to_utf16_alloc(options->file, &application); if (err) goto done; err = make_program_args( options->args, options->flags & UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS, &arguments); if (err) goto done; if (options->env) { err = make_program_env(options->env, &env); if (err) goto done; } if (options->cwd) { /* Explicit cwd */ err = uv__utf8_to_utf16_alloc(options->cwd, &cwd); if (err) goto done; } else { /* Inherit cwd */ DWORD cwd_len, r; cwd_len = GetCurrentDirectoryW(0, NULL); if (!cwd_len) { err = GetLastError(); goto done; } cwd = (WCHAR*) uv__malloc(cwd_len * sizeof(WCHAR)); if (cwd == NULL) { err = ERROR_OUTOFMEMORY; goto done; } r = GetCurrentDirectoryW(cwd_len, cwd); if (r == 0 || r >= cwd_len) { err = GetLastError(); goto done; } } /* Get PATH environment variable. */ path = find_path(env); if (path == NULL) { DWORD path_len, r; path_len = GetEnvironmentVariableW(L"PATH", NULL, 0); if (path_len == 0) { err = GetLastError(); goto done; } alloc_path = (WCHAR*) uv__malloc(path_len * sizeof(WCHAR)); if (alloc_path == NULL) { err = ERROR_OUTOFMEMORY; goto done; } path = alloc_path; r = GetEnvironmentVariableW(L"PATH", path, path_len); if (r == 0 || r >= path_len) { err = GetLastError(); goto done; } } err = uv__stdio_create(loop, options, &child_stdio_buffer); if (err) goto done; application_path = search_path(application, cwd, path); if (application_path == NULL) { /* Not found. */ err = ERROR_FILE_NOT_FOUND; goto done; } startup.cb = sizeof(startup); startup.lpReserved = NULL; startup.lpDesktop = NULL; startup.lpTitle = NULL; startup.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; startup.cbReserved2 = uv__stdio_size(child_stdio_buffer); startup.lpReserved2 = (BYTE*) child_stdio_buffer; startup.hStdInput = uv__stdio_handle(child_stdio_buffer, 0); startup.hStdOutput = uv__stdio_handle(child_stdio_buffer, 1); startup.hStdError = uv__stdio_handle(child_stdio_buffer, 2); process_flags = CREATE_UNICODE_ENVIRONMENT; if ((options->flags & UV_PROCESS_WINDOWS_HIDE_CONSOLE) || (options->flags & UV_PROCESS_WINDOWS_HIDE)) { /* Avoid creating console window if stdio is not inherited. */ for (i = 0; i < options->stdio_count; i++) { if (options->stdio[i].flags & UV_INHERIT_FD) break; if (i == options->stdio_count - 1) process_flags |= CREATE_NO_WINDOW; } } if ((options->flags & UV_PROCESS_WINDOWS_HIDE_GUI) || (options->flags & UV_PROCESS_WINDOWS_HIDE)) { /* Use SW_HIDE to avoid any potential process window. */ startup.wShowWindow = SW_HIDE; } else { startup.wShowWindow = SW_SHOWDEFAULT; } if (options->flags & UV_PROCESS_DETACHED) { /* Note that we're not setting the CREATE_BREAKAWAY_FROM_JOB flag. That * means that libuv might not let you create a fully daemonized process * when run under job control. However the type of job control that libuv * itself creates doesn't trickle down to subprocesses so they can still * daemonize. * * A reason to not do this is that CREATE_BREAKAWAY_FROM_JOB makes the * CreateProcess call fail if we're under job control that doesn't allow * breakaway. */ process_flags |= DETACHED_PROCESS | CREATE_NEW_PROCESS_GROUP; } if (!CreateProcessW(application_path, arguments, NULL, NULL, 1, process_flags, env, cwd, &startup, &info)) { /* CreateProcessW failed. */ err = GetLastError(); goto done; } /* Spawn succeeded. Beyond this point, failure is reported asynchronously. */ process->process_handle = info.hProcess; process->pid = info.dwProcessId; /* If the process isn't spawned as detached, assign to the global job object * so windows will kill it when the parent process dies. */ if (!(options->flags & UV_PROCESS_DETACHED)) { uv_once(&uv_global_job_handle_init_guard_, uv__init_global_job_handle); if (!AssignProcessToJobObject(uv_global_job_handle_, info.hProcess)) { /* AssignProcessToJobObject might fail if this process is under job * control and the job doesn't have the * JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK flag set, on a Windows version * that doesn't support nested jobs. * * When that happens we just swallow the error and continue without * establishing a kill-child-on-parent-exit relationship, otherwise * there would be no way for libuv applications run under job control * to spawn processes at all. */ DWORD err = GetLastError(); if (err != ERROR_ACCESS_DENIED) uv_fatal_error(err, "AssignProcessToJobObject"); } } /* Set IPC pid to all IPC pipes. */ for (i = 0; i < options->stdio_count; i++) { const uv_stdio_container_t* fdopt = &options->stdio[i]; if (fdopt->flags & UV_CREATE_PIPE && fdopt->data.stream->type == UV_NAMED_PIPE && ((uv_pipe_t*) fdopt->data.stream)->ipc) { ((uv_pipe_t*) fdopt->data.stream)->pipe.conn.ipc_remote_pid = info.dwProcessId; } } /* Setup notifications for when the child process exits. */ result = RegisterWaitForSingleObject(&process->wait_handle, process->process_handle, exit_wait_callback, (void*)process, INFINITE, WT_EXECUTEINWAITTHREAD | WT_EXECUTEONLYONCE); if (!result) { uv_fatal_error(GetLastError(), "RegisterWaitForSingleObject"); } CloseHandle(info.hThread); assert(!err); /* Make the handle active. It will remain active until the exit callback is * made or the handle is closed, whichever happens first. */ uv__handle_start(process); /* Cleanup, whether we succeeded or failed. */ done: uv__free(application); uv__free(application_path); uv__free(arguments); uv__free(cwd); uv__free(env); uv__free(alloc_path); if (child_stdio_buffer != NULL) { /* Clean up child stdio handles. */ uv__stdio_destroy(child_stdio_buffer); child_stdio_buffer = NULL; } return uv_translate_sys_error(err); } static int uv__kill(HANDLE process_handle, int signum) { if (signum < 0 || signum >= NSIG) { return UV_EINVAL; } /* Create a dump file for the targeted process, if the registry key * `HKLM:Software\Microsoft\Windows\Windows Error Reporting\LocalDumps` * exists. The location of the dumps can be influenced by the `DumpFolder` * sub-key, which has a default value of `%LOCALAPPDATA%\CrashDumps`, see [0] * for more detail. Note that if the dump folder does not exist, we attempt * to create it, to match behavior with WER itself. * [0]: https://learn.microsoft.com/en-us/windows/win32/wer/collecting-user-mode-dumps */ if (signum == SIGQUIT) { HKEY registry_key; DWORD pid, ret; WCHAR basename[MAX_PATH]; /* Get target process name. */ GetModuleBaseNameW(process_handle, NULL, &basename[0], sizeof(basename)); /* Get PID of target process. */ pid = GetProcessId(process_handle); /* Get LocalDumps directory path. */ ret = RegOpenKeyExW( HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Windows\\Windows Error Reporting\\LocalDumps", 0, KEY_QUERY_VALUE, ®istry_key); if (ret == ERROR_SUCCESS) { HANDLE hDumpFile = NULL; WCHAR dump_folder[MAX_PATH], dump_name[MAX_PATH]; DWORD dump_folder_len = sizeof(dump_folder), key_type = 0; ret = RegGetValueW(registry_key, NULL, L"DumpFolder", RRF_RT_ANY, &key_type, (PVOID) dump_folder, &dump_folder_len); if (ret != ERROR_SUCCESS) { /* Default value for `dump_folder` is `%LOCALAPPDATA%\CrashDumps`. */ WCHAR* localappdata; SHGetKnownFolderPath(&FOLDERID_LocalAppData, 0, NULL, &localappdata); _snwprintf_s(dump_folder, sizeof(dump_folder), _TRUNCATE, L"%ls\\CrashDumps", localappdata); CoTaskMemFree(localappdata); } RegCloseKey(registry_key); /* Create dump folder if it doesn't already exist. */ CreateDirectoryW(dump_folder, NULL); /* Construct dump filename from process name and PID. */ _snwprintf_s(dump_name, sizeof(dump_name), _TRUNCATE, L"%ls\\%ls.%d.dmp", dump_folder, basename, pid); hDumpFile = CreateFileW(dump_name, GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL); if (hDumpFile != INVALID_HANDLE_VALUE) { DWORD dump_options, sym_options; FILE_DISPOSITION_INFO DeleteOnClose = { TRUE }; /* If something goes wrong while writing it out, delete the file. */ SetFileInformationByHandle(hDumpFile, FileDispositionInfo, &DeleteOnClose, sizeof(DeleteOnClose)); /* Tell wine to dump ELF modules as well. */ sym_options = SymGetOptions(); SymSetOptions(sym_options | 0x40000000); /* MiniDumpWithAvxXStateContext might be undef in server2012r2 or mingw < 12 */ #ifndef MiniDumpWithAvxXStateContext #define MiniDumpWithAvxXStateContext 0x00200000 #endif /* We default to a fairly complete dump. In the future, we may want to * allow clients to customize what kind of dump to create. */ dump_options = MiniDumpWithFullMemory | MiniDumpIgnoreInaccessibleMemory | MiniDumpWithAvxXStateContext; if (MiniDumpWriteDump(process_handle, pid, hDumpFile, dump_options, NULL, NULL, NULL)) { /* Don't delete the file on close if we successfully wrote it out. */ FILE_DISPOSITION_INFO DontDeleteOnClose = { FALSE }; SetFileInformationByHandle(hDumpFile, FileDispositionInfo, &DontDeleteOnClose, sizeof(DontDeleteOnClose)); } SymSetOptions(sym_options); CloseHandle(hDumpFile); } } } switch (signum) { case SIGQUIT: case SIGTERM: case SIGKILL: case SIGINT: { /* Unconditionally terminate the process. On Windows, killed processes * normally return 1. */ DWORD status; int err; if (TerminateProcess(process_handle, 1)) return 0; /* If the process already exited before TerminateProcess was called,. * TerminateProcess will fail with ERROR_ACCESS_DENIED. */ err = GetLastError(); if (err == ERROR_ACCESS_DENIED && GetExitCodeProcess(process_handle, &status) && status != STILL_ACTIVE) { return UV_ESRCH; } return uv_translate_sys_error(err); } case 0: { /* Health check: is the process still alive? */ DWORD status; if (!GetExitCodeProcess(process_handle, &status)) return uv_translate_sys_error(GetLastError()); if (status != STILL_ACTIVE) return UV_ESRCH; return 0; } default: /* Unsupported signal. */ return UV_ENOSYS; } } int uv_process_kill(uv_process_t* process, int signum) { int err; if (process->process_handle == INVALID_HANDLE_VALUE) { return UV_EINVAL; } err = uv__kill(process->process_handle, signum); if (err) { return err; /* err is already translated. */ } process->exit_signal = signum; return 0; } int uv_kill(int pid, int signum) { int err; HANDLE process_handle; if (pid == 0) { process_handle = GetCurrentProcess(); } else { process_handle = OpenProcess(PROCESS_TERMINATE | PROCESS_QUERY_INFORMATION, FALSE, pid); } if (process_handle == NULL) { err = GetLastError(); if (err == ERROR_INVALID_PARAMETER) { return UV_ESRCH; } else { return uv_translate_sys_error(err); } } err = uv__kill(process_handle, signum); CloseHandle(process_handle); return err; /* err is already translated. */ }