diff options
Diffstat (limited to 'Utilities/cmlibuv/src/win/process.c')
| -rw-r--r-- | Utilities/cmlibuv/src/win/process.c | 1247 |
1 files changed, 1247 insertions, 0 deletions
diff --git a/Utilities/cmlibuv/src/win/process.c b/Utilities/cmlibuv/src/win/process.c new file mode 100644 index 0000000..855c374 --- /dev/null +++ b/Utilities/cmlibuv/src/win/process.c @@ -0,0 +1,1247 @@ +/* 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 <assert.h> +#include <io.h> +#include <stdio.h> +#include <stdlib.h> +#include <signal.h> +#include <limits.h> +#include <wchar.h> +#include <malloc.h> /* alloca */ + +#include "uv.h" +#include "internal.h" +#include "handle-inl.h" +#include "req-inl.h" + + +#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 size_t n_required_vars = ARRAY_SIZE(required_vars); + + +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->child_stdio_buffer = NULL; + handle->exit_cb_pending = 0; + + uv_req_init(loop, (uv_req_t*)&handle->exit_req); + handle->exit_req.type = 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[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; + + /* Slice until the next ; or \0 is found */ + dir_end = wcschr(dir_start, 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'; + + while (1) { + 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 = alloca(n_required_vars * sizeof(DWORD*)); + + /* 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) { + 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 == 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 < n_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 < n_required_vars; + ptr += len) { + int cmp; + if (i >= n_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 != len-1) { /* 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 == (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 (wcsncmp(env, L"PATH=", 5) == 0) + 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 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; + + uv_process_init(loop, process); + process->exit_cb = options->exit_cb; + + 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_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, &process->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(process->child_stdio_buffer); + startup.lpReserved2 = (BYTE*) process->child_stdio_buffer; + + startup.hStdInput = uv__stdio_handle(process->child_stdio_buffer, 0); + startup.hStdOutput = uv__stdio_handle(process->child_stdio_buffer, 1); + startup.hStdError = uv__stdio_handle(process->child_stdio_buffer, 2); + + if (options->flags & UV_PROCESS_WINDOWS_HIDE) { + /* Use SW_HIDE to avoid any potential process window. */ + startup.wShowWindow = SW_HIDE; + } else { + startup.wShowWindow = SW_SHOWDEFAULT; + } + + process_flags = CREATE_UNICODE_ENVIRONMENT; + + 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_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 (process->child_stdio_buffer != NULL) { + /* Clean up child stdio handles. */ + uv__stdio_destroy(process->child_stdio_buffer); + process->child_stdio_buffer = NULL; + } + + return uv_translate_sys_error(err); +} + + +static int uv__kill(HANDLE process_handle, int signum) { + switch (signum) { + 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 = 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. */ +} |