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Diffstat (limited to 'tools/win32/process.c')
| -rw-r--r-- | tools/win32/process.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/tools/win32/process.c b/tools/win32/process.c new file mode 100644 index 0000000..8bc9337 --- /dev/null +++ b/tools/win32/process.c @@ -0,0 +1,213 @@ +/* + * ***** BEGIN LICENSE BLOCK ***** + * Version: MIT + * + * Portions created by VMware are Copyright (c) 2007-2012 VMware, Inc. + * All Rights Reserved. + * + * Portions created by Tony Garnock-Jones are Copyright (c) 2009-2010 + * VMware, Inc. and Tony Garnock-Jones. 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. + * ***** END LICENSE BLOCK ***** + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <stdio.h> +#include <io.h> +#include <windows.h> + +#include "common.h" +#include "process.h" + +void die_windows_error(const char *fmt, ...) +{ + char *msg; + + va_list ap; + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM + | FORMAT_MESSAGE_ALLOCATE_BUFFER, + NULL, GetLastError(), + MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), + (LPSTR)&msg, 0, NULL)) + msg = "(failed to retrieve Windows error message)"; + + fprintf(stderr, ": %s\n", msg); + exit(1); +} + +static char *make_command_line(const char *const *argv) +{ + int i; + size_t len = 1; /* initial quotes */ + char *buf; + char *dest; + + /* calculate the length of the required buffer, making worst + case assumptions for simplicity */ + for (i = 0;;) { + /* each character could need escaping */ + len += strlen(argv[i]) * 2; + + if (!argv[++i]) + break; + + len += 3; /* quotes, space, quotes */ + } + + len += 2; /* final quotes and the terminating zero */ + + dest = buf = malloc(len); + if (!buf) + die("allocating memory for subprocess command line"); + + /* Here we perform the inverse of the CommandLineToArgvW + function. Note that its rules are slightly crazy: A + sequence of backslashes only act to escape if followed by + double quotes. A sequence of backslashes not followed by + double quotes is untouched. */ + + for (i = 0;;) { + const char *src = argv[i]; + int backslashes = 0; + + *dest++ = '\"'; + + for (;;) { + switch (*src) { + case 0: + goto done; + + case '\"': + for (; backslashes; backslashes--) + *dest++ = '\\'; + + *dest++ = '\\'; + *dest++ = '\"'; + break; + + case '\\': + backslashes++; + *dest++ = '\\'; + break; + + default: + backslashes = 0; + *dest++ = *src; + break; + } + + src++; + } + done: + for (; backslashes; backslashes--) + *dest++ = '\\'; + + *dest++ = '\"'; + + if (!argv[++i]) + break; + + *dest++ = ' '; + } + + *dest++ = 0; + return buf; +} + +void pipeline(const char *const *argv, struct pipeline *pl) +{ + HANDLE in_read_handle, in_write_handle; + SECURITY_ATTRIBUTES sec_attr; + PROCESS_INFORMATION proc_info; + STARTUPINFO start_info; + char *cmdline = make_command_line(argv); + + sec_attr.nLength = sizeof sec_attr; + sec_attr.bInheritHandle = TRUE; + sec_attr.lpSecurityDescriptor = NULL; + + if (!CreatePipe(&in_read_handle, &in_write_handle, &sec_attr, 0)) + die_windows_error("CreatePipe"); + + if (!SetHandleInformation(in_write_handle, HANDLE_FLAG_INHERIT, 0)) + die_windows_error("SetHandleInformation"); + + /* when in Rome... */ + ZeroMemory(&proc_info, sizeof proc_info); + ZeroMemory(&start_info, sizeof start_info); + + start_info.cb = sizeof start_info; + start_info.dwFlags |= STARTF_USESTDHANDLES; + + if ((start_info.hStdError = GetStdHandle(STD_ERROR_HANDLE)) + == INVALID_HANDLE_VALUE + || (start_info.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE)) + == INVALID_HANDLE_VALUE) + die_windows_error("GetStdHandle"); + + start_info.hStdInput = in_read_handle; + + if (!CreateProcess(NULL, cmdline, NULL, NULL, TRUE, 0, + NULL, NULL, &start_info, &proc_info)) + die_windows_error("CreateProcess"); + + free(cmdline); + + if (!CloseHandle(proc_info.hThread)) + die_windows_error("CloseHandle for thread"); + if (!CloseHandle(in_read_handle)) + die_windows_error("CloseHandle"); + + pl->proc_handle = proc_info.hProcess; + pl->infd = _open_osfhandle((intptr_t)in_write_handle, 0); +} + +int finish_pipeline(struct pipeline *pl) +{ + DWORD code; + + if (close(pl->infd)) + die_errno(errno, "close"); + + for (;;) { + if (!GetExitCodeProcess(pl->proc_handle, &code)) + die_windows_error("GetExitCodeProcess"); + if (code != STILL_ACTIVE) + break; + + if (WaitForSingleObject(pl->proc_handle, INFINITE) + == WAIT_FAILED) + die_windows_error("WaitForSingleObject"); + } + + if (!CloseHandle(pl->proc_handle)) + die_windows_error("CloseHandle for process"); + + return code; +} |