mirror of
https://github.com/mpv-player/mpv.git
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31b78ad7fa
It seems a bit inappropriate to have dumped this into stream.c, even if it's roughly speaking its main user. At least it made its way somewhat unfortunately to other components not related to the stream or demuxer layer at all. I'm too greedy to give this weird helper its own file, so dump it into thread_tools.c. Probably a somewhat pointless change.
361 lines
11 KiB
C
361 lines
11 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <windows.h>
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#include <string.h>
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#include "osdep/subprocess.h"
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#include "osdep/io.h"
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#include "osdep/atomic.h"
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#include "mpv_talloc.h"
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#include "common/common.h"
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#include "stream/stream.h"
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#include "misc/bstr.h"
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#include "misc/thread_tools.h"
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static void write_arg(bstr *cmdline, char *arg)
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{
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// Empty args must be represented as an empty quoted string
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if (!arg[0]) {
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bstr_xappend(NULL, cmdline, bstr0("\"\""));
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return;
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}
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// If the string doesn't have characters that need to be escaped, it's best
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// to leave it alone for the sake of Windows programs that don't process
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// quoted args correctly.
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if (!strpbrk(arg, " \t\"")) {
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bstr_xappend(NULL, cmdline, bstr0(arg));
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return;
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}
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// If there are characters that need to be escaped, write a quoted string
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bstr_xappend(NULL, cmdline, bstr0("\""));
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// Escape the argument. To match the behavior of CommandLineToArgvW,
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// backslashes are only escaped if they appear before a quote or the end of
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// the string.
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int num_slashes = 0;
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for (int pos = 0; arg[pos]; pos++) {
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switch (arg[pos]) {
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case '\\':
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// Count consecutive backslashes
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num_slashes++;
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break;
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case '"':
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// Write the argument up to the point before the quote
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bstr_xappend(NULL, cmdline, (struct bstr){arg, pos});
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arg += pos;
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pos = 0;
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// Double backslashes preceding the quote
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for (int i = 0; i < num_slashes; i++)
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bstr_xappend(NULL, cmdline, bstr0("\\"));
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num_slashes = 0;
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// Escape the quote itself
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bstr_xappend(NULL, cmdline, bstr0("\\"));
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break;
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default:
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num_slashes = 0;
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}
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}
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// Write the rest of the argument
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bstr_xappend(NULL, cmdline, bstr0(arg));
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// Double backslashes at the end of the argument
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for (int i = 0; i < num_slashes; i++)
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bstr_xappend(NULL, cmdline, bstr0("\\"));
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bstr_xappend(NULL, cmdline, bstr0("\""));
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}
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// Convert an array of arguments to a properly escaped command-line string
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static wchar_t *write_cmdline(void *ctx, char **argv)
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{
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// argv[0] should always be quoted. Otherwise, arguments may be interpreted
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// as part of the program name. Also, it can't contain escape sequences.
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bstr cmdline = {0};
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bstr_xappend_asprintf(NULL, &cmdline, "\"%s\"", argv[0]);
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for (int i = 1; argv[i]; i++) {
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bstr_xappend(NULL, &cmdline, bstr0(" "));
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write_arg(&cmdline, argv[i]);
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}
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wchar_t *wcmdline = mp_from_utf8(ctx, cmdline.start);
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talloc_free(cmdline.start);
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return wcmdline;
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}
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static int create_overlapped_pipe(HANDLE *read, HANDLE *write)
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{
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static atomic_ulong counter = ATOMIC_VAR_INIT(0);
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// Generate pipe name
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unsigned long id = atomic_fetch_add(&counter, 1);
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unsigned pid = GetCurrentProcessId();
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wchar_t buf[36];
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swprintf(buf, MP_ARRAY_SIZE(buf), L"\\\\.\\pipe\\mpv-anon-%08x-%08lx",
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pid, id);
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// The function for creating anonymous pipes (CreatePipe) can't create
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// overlapped pipes, so instead, use a named pipe with a unique name
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*read = CreateNamedPipeW(buf, PIPE_ACCESS_INBOUND |
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FILE_FLAG_FIRST_PIPE_INSTANCE | FILE_FLAG_OVERLAPPED,
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PIPE_TYPE_BYTE | PIPE_WAIT | PIPE_REJECT_REMOTE_CLIENTS,
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1, 0, 4096, 0, NULL);
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if (*read == INVALID_HANDLE_VALUE)
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goto error;
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// Open the write end of the pipe as a synchronous handle
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*write = CreateFileW(buf, GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL, NULL);
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if (*write == INVALID_HANDLE_VALUE) {
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CloseHandle(*read);
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goto error;
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}
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return 0;
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error:
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*read = *write = INVALID_HANDLE_VALUE;
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return -1;
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}
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static void delete_handle_list(void *p)
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{
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LPPROC_THREAD_ATTRIBUTE_LIST list = p;
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DeleteProcThreadAttributeList(list);
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}
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// Create a PROC_THREAD_ATTRIBUTE_LIST that specifies exactly which handles are
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// inherited by the subprocess
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static LPPROC_THREAD_ATTRIBUTE_LIST create_handle_list(void *ctx,
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HANDLE *handles, int num)
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{
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// Get required attribute list size
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SIZE_T size = 0;
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if (!InitializeProcThreadAttributeList(NULL, 1, 0, &size)) {
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if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
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return NULL;
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}
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// Allocate attribute list
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LPPROC_THREAD_ATTRIBUTE_LIST list = talloc_size(ctx, size);
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if (!InitializeProcThreadAttributeList(list, 1, 0, &size))
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goto error;
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talloc_set_destructor(list, delete_handle_list);
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if (!UpdateProcThreadAttribute(list, 0, PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
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handles, num * sizeof(HANDLE), NULL, NULL))
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goto error;
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return list;
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error:
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talloc_free(list);
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return NULL;
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}
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// Helper method similar to sparse_poll, skips NULL handles
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static int sparse_wait(HANDLE *handles, unsigned num_handles)
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{
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unsigned w_num_handles = 0;
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HANDLE w_handles[10];
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int map[10];
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if (num_handles > MP_ARRAY_SIZE(w_handles))
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return -1;
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for (unsigned i = 0; i < num_handles; i++) {
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if (!handles[i])
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continue;
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w_handles[w_num_handles] = handles[i];
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map[w_num_handles] = i;
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w_num_handles++;
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}
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if (w_num_handles == 0)
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return -1;
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DWORD i = WaitForMultipleObjects(w_num_handles, w_handles, FALSE, INFINITE);
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i -= WAIT_OBJECT_0;
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if (i >= w_num_handles)
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return -1;
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return map[i];
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}
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// Wrapper for ReadFile that treats ERROR_IO_PENDING as success
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static int async_read(HANDLE file, void *buf, unsigned size, OVERLAPPED* ol)
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{
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if (!ReadFile(file, buf, size, NULL, ol))
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return (GetLastError() == ERROR_IO_PENDING) ? 0 : -1;
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return 0;
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}
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static void write_none(void *ctx, char *data, size_t size)
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{
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}
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int mp_subprocess(char **args, struct mp_cancel *cancel, void *ctx,
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subprocess_read_cb on_stdout, subprocess_read_cb on_stderr,
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char **error)
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{
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wchar_t *tmp = talloc_new(NULL);
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int status = -1;
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struct {
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HANDLE read;
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HANDLE write;
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OVERLAPPED ol;
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char buf[4096];
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subprocess_read_cb read_cb;
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} pipes[2] = {
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{ .read_cb = on_stdout ? on_stdout : write_none },
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{ .read_cb = on_stderr ? on_stderr : write_none },
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};
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// If the function exits before CreateProcess, there was an init error
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*error = "init";
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for (int i = 0; i < 2; i++) {
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pipes[i].ol.hEvent = CreateEventW(NULL, TRUE, FALSE, NULL);
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if (!pipes[i].ol.hEvent)
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goto done;
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if (create_overlapped_pipe(&pipes[i].read, &pipes[i].write))
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goto done;
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if (!SetHandleInformation(pipes[i].write, HANDLE_FLAG_INHERIT,
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HANDLE_FLAG_INHERIT))
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goto done;
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}
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// Convert the args array to a UTF-16 Windows command-line string
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wchar_t *cmdline = write_cmdline(tmp, args);
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DWORD flags = CREATE_UNICODE_ENVIRONMENT | EXTENDED_STARTUPINFO_PRESENT;
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PROCESS_INFORMATION pi = {0};
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STARTUPINFOEXW si = {
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.StartupInfo = {
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.cb = sizeof(si),
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.dwFlags = STARTF_USESTDHANDLES | STARTF_FORCEOFFFEEDBACK,
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.hStdInput = NULL,
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.hStdOutput = pipes[0].write,
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.hStdError = pipes[1].write,
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},
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// Specify which handles are inherited by the subprocess. If this isn't
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// specified, the subprocess inherits all inheritable handles, which
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// could include handles created by other threads. See:
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// http://blogs.msdn.com/b/oldnewthing/archive/2011/12/16/10248328.aspx
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.lpAttributeList = create_handle_list(tmp,
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(HANDLE[]){ pipes[0].write, pipes[1].write }, 2),
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};
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// If we have a console, the subprocess will automatically attach to it so
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// it can receive Ctrl+C events. If we don't have a console, prevent the
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// subprocess from creating its own console window by specifying
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// CREATE_NO_WINDOW. GetConsoleCP() can be used to reliably determine if we
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// have a console or not (Cygwin uses it too.)
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if (!GetConsoleCP())
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flags |= CREATE_NO_WINDOW;
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if (!CreateProcessW(NULL, cmdline, NULL, NULL, TRUE, flags, NULL, NULL,
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&si.StartupInfo, &pi))
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goto done;
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talloc_free(cmdline);
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talloc_free(si.lpAttributeList);
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CloseHandle(pi.hThread);
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// Init is finished
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*error = NULL;
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// List of handles to watch with sparse_wait
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HANDLE handles[] = { pipes[0].ol.hEvent, pipes[1].ol.hEvent, pi.hProcess,
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cancel ? mp_cancel_get_event(cancel) : NULL };
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for (int i = 0; i < 2; i++) {
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// Close our copy of the write end of the pipes
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CloseHandle(pipes[i].write);
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pipes[i].write = NULL;
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// Do the first read operation on each pipe
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if (async_read(pipes[i].read, pipes[i].buf, 4096, &pipes[i].ol)) {
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CloseHandle(pipes[i].read);
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handles[i] = pipes[i].read = NULL;
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}
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}
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DWORD r;
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DWORD exit_code;
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while (pipes[0].read || pipes[1].read || pi.hProcess) {
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int i = sparse_wait(handles, MP_ARRAY_SIZE(handles));
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switch (i) {
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case 0:
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case 1:
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// Complete the read operation on the pipe
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if (!GetOverlappedResult(pipes[i].read, &pipes[i].ol, &r, TRUE)) {
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CloseHandle(pipes[i].read);
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handles[i] = pipes[i].read = NULL;
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break;
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}
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pipes[i].read_cb(ctx, pipes[i].buf, r);
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// Begin the next read operation on the pipe
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if (async_read(pipes[i].read, pipes[i].buf, 4096, &pipes[i].ol)) {
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CloseHandle(pipes[i].read);
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handles[i] = pipes[i].read = NULL;
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}
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break;
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case 2:
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GetExitCodeProcess(pi.hProcess, &exit_code);
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status = exit_code;
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CloseHandle(pi.hProcess);
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handles[i] = pi.hProcess = NULL;
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break;
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case 3:
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if (pi.hProcess) {
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TerminateProcess(pi.hProcess, 1);
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*error = "killed";
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status = MP_SUBPROCESS_EKILLED_BY_US;
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goto done;
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}
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break;
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default:
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goto done;
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}
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}
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done:
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for (int i = 0; i < 2; i++) {
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if (pipes[i].read) {
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// Cancel any pending I/O (if the process was killed)
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CancelIo(pipes[i].read);
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GetOverlappedResult(pipes[i].read, &pipes[i].ol, &r, TRUE);
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CloseHandle(pipes[i].read);
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}
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if (pipes[i].write) CloseHandle(pipes[i].write);
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if (pipes[i].ol.hEvent) CloseHandle(pipes[i].ol.hEvent);
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}
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if (pi.hProcess) CloseHandle(pi.hProcess);
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talloc_free(tmp);
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return status;
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}
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