1090 lines
26 KiB
C++
1090 lines
26 KiB
C++
/* dtable.cc: file descriptor support.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#define __INSIDE_CYGWIN_NET__
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#include "winsup.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <wchar.h>
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#define USE_SYS_TYPES_FD_SET
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#include <winsock.h>
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#include "pinfo.h"
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#include "cygerrno.h"
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#include "perprocess.h"
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#include "path.h"
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#include "fhandler.h"
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#include "select.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "tls_pbuf.h"
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#include "ntdll.h"
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#include "shared_info.h"
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static const DWORD std_consts[] = {STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
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STD_ERROR_HANDLE};
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static bool handle_to_fn (HANDLE, char *);
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#define WCLEN(x) ((sizeof (x) / sizeof (WCHAR)) - 1)
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static const char unknown_file[] = "some disk file";
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static const WCHAR DEV_NULL[] = L"\\Device\\Null";
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static const WCHAR DEV_SOCKET[] = L"\\Device\\Afd";
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static const WCHAR DEVICE_PREFIX[] = L"\\device\\";
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static const size_t DEVICE_PREFIX_LEN WCLEN (DEVICE_PREFIX);
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static const WCHAR DEV_NAMED_PIPE[] = L"\\Device\\NamedPipe\\";
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static const size_t DEV_NAMED_PIPE_LEN = WCLEN (DEV_NAMED_PIPE);
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static const WCHAR DEV_REMOTE[] = L"\\Device\\LanmanRedirector\\";
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static const size_t DEV_REMOTE_LEN = WCLEN (DEV_REMOTE);
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static const WCHAR DEV_REMOTE1[] = L"\\Device\\WinDfs\\Root\\";
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static const size_t DEV_REMOTE1_LEN = WCLEN (DEV_REMOTE1);
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/* Set aside space for the table of fds */
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void
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dtable_init ()
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{
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if (!cygheap->fdtab.size)
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cygheap->fdtab.extend (NOFILE_INCR, 0);
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}
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void __stdcall
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set_std_handle (int fd)
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{
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fhandler_base *fh = cygheap->fdtab[fd];
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if (fd == 0)
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SetStdHandle (std_consts[fd], fh ? fh->get_handle () : NULL);
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else if (fd <= 2)
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SetStdHandle (std_consts[fd], fh ? fh->get_output_handle () : NULL);
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}
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int
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dtable::extend (size_t howmuch, size_t min)
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{
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size_t new_size = size + howmuch;
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fhandler_base **newfds;
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if (new_size <= OPEN_MAX_MAX)
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/* ok */;
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else if (size < OPEN_MAX_MAX && min < OPEN_MAX_MAX)
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new_size = OPEN_MAX_MAX;
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else
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{
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set_errno (EMFILE);
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return 0;
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}
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/* Try to allocate more space for fd table. We can't call realloc ()
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here to preserve old table if memory allocation fails */
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if (!(newfds = (fhandler_base **) ccalloc (HEAP_ARGV, new_size, sizeof newfds[0])))
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{
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debug_printf ("calloc failed");
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set_errno (ENOMEM);
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return 0;
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}
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if (fds)
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{
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memcpy (newfds, fds, size * sizeof (fds[0]));
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cfree (fds);
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}
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size = new_size;
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fds = newfds;
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debug_printf ("size %ld, fds %p", size, fds);
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return 1;
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}
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void
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dtable::get_debugger_info ()
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{
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extern bool jit_debug;
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if (!jit_debug && being_debugged ())
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{
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char std[3][sizeof ("/dev/ptyNNNN")];
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std[0][0] = std[1][0] = std [2][0] = '\0';
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char buf[sizeof ("cYgstd %x") + 64];
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sprintf (buf, "cYgstd %p %zx %x", &std, sizeof (std[0]), 3);
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OutputDebugString (buf);
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for (int i = 0; i < 3; i++)
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if (std[i][0])
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{
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HANDLE h = GetStdHandle (std_consts[i]);
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fhandler_base *fh = build_fh_name (std[i]);
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if (!fh)
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continue;
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fds[i] = fh;
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if (!fh->open ((i ? (i == 2 ? O_RDWR : O_WRONLY) : O_RDONLY)
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| O_BINARY, 0777))
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release (i);
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else
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{
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CloseHandle (h);
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/* Copy to Windows' idea of a standard handle, otherwise
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we have invalid standard handles when calling Windows
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functions (small_printf and strace might suffer, too). */
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SetStdHandle (std_consts[i], i ? fh->get_output_handle ()
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: fh->get_handle ());
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}
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}
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}
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}
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/* Initialize the file descriptor/handle mapping table.
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This function should only be called when a cygwin function is invoked
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by a non-cygwin function, i.e., it should only happen very rarely. */
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void
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dtable::stdio_init ()
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{
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if (myself->cygstarted || ISSTATE (myself, PID_CYGPARENT))
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{
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tty_min *t = cygwin_shared->tty.get_cttyp ();
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if (t && t->is_console)
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init_console_handler (true);
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return;
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}
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HANDLE in = GetStdHandle (STD_INPUT_HANDLE);
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HANDLE out = GetStdHandle (STD_OUTPUT_HANDLE);
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HANDLE err = GetStdHandle (STD_ERROR_HANDLE);
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init_std_file_from_handle (0, in);
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/* STD_ERROR_HANDLE has been observed to be the same as
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STD_OUTPUT_HANDLE. We need separate handles (e.g. using pipes
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to pass data from child to parent). */
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/* CV 2008-10-17: Under debugger control, std fd's have been potentially
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initialized in dtable::get_debugger_info (). In this case
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init_std_file_from_handle is a no-op, so, even if out == err we don't
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want to duplicate the handle since it will be unused. */
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if (out == err && (!being_debugged () || not_open (2)))
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{
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/* Since this code is not invoked for forked tasks, we don't have
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to worry about the close-on-exec flag here. */
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if (!DuplicateHandle (GetCurrentProcess (), out,
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GetCurrentProcess (), &err,
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0, TRUE, DUPLICATE_SAME_ACCESS))
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{
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/* If that fails, do this as a fall back. */
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err = out;
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system_printf ("couldn't make stderr distinct from stdout, %E");
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}
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}
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init_std_file_from_handle (1, out);
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init_std_file_from_handle (2, err);
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}
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const int dtable::initial_archetype_size;
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fhandler_base *
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dtable::find_archetype (device& dev)
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{
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for (unsigned i = 0; i < farchetype; i++)
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if (archetypes[i]->get_device () == (dev_t) dev)
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return archetypes[i];
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return NULL;
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}
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fhandler_base **
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dtable::add_archetype ()
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{
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if (farchetype++ >= narchetypes)
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archetypes = (fhandler_base **) crealloc_abort (archetypes, (narchetypes += initial_archetype_size) * sizeof archetypes[0]);
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return archetypes + farchetype - 1;
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}
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void
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dtable::delete_archetype (fhandler_base *fh)
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{
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for (unsigned i = 0; i < farchetype; i++)
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if (fh == archetypes[i])
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{
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debug_printf ("deleting element %d for %s(%d/%d)", i, fh->get_name (),
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fh->dev ().get_major (), fh->dev ().get_minor ());
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if (i < --farchetype)
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archetypes[i] = archetypes[farchetype];
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break;
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}
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delete fh;
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}
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int
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dtable::find_unused_handle (size_t start)
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{
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/* When extending, try to allocate a NOFILE_INCR chunk
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following the empty fd. */
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size_t extendby = NOFILE_INCR + ((start >= size) ? 1 + start - size : 0);
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/* This do loop should only ever execute twice. */
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int res = -1;
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do
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{
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for (size_t i = start; i < size; i++)
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if (fds[i] == NULL)
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{
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res = (int) i;
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goto out;
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}
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}
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while (extend (extendby, start));
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out:
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return res;
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}
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void
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dtable::release (int fd)
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{
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if (fds[fd]->need_fixup_before ())
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dec_need_fixup_before ();
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fds[fd]->dec_refcnt ();
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fds[fd] = NULL;
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if (fd <= 2)
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set_std_handle (fd);
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}
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extern "C" int
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cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin,
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DWORD myaccess)
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{
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cygheap->fdtab.lock ();
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if (fd == -1)
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fd = cygheap->fdtab.find_unused_handle ();
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fhandler_base *fh = build_fh_name (name);
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if (!fh)
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fd = -1;
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else
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{
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cygheap->fdtab[fd] = fh;
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cygheap->fdtab[fd]->inc_refcnt ();
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fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
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}
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cygheap->fdtab.unlock ();
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return fd;
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}
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void
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dtable::init_std_file_from_handle (int fd, HANDLE handle)
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{
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tmp_pathbuf tp;
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CONSOLE_SCREEN_BUFFER_INFO buf;
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DCB dcb;
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unsigned bin = O_BINARY;
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device dev;
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first_fd_for_open = 0;
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if (!not_open (fd))
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return;
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SetLastError (0);
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DWORD access = 0;
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DWORD ft = GetFileType (handle);
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char *name = tp.c_get ();
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name[0] = '\0';
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if (ft == FILE_TYPE_UNKNOWN && GetLastError () == ERROR_INVALID_HANDLE)
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/* can't figure out what this is */;
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else if (ft == FILE_TYPE_PIPE)
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{
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int rcv = 0, len = sizeof (int);
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if (handle_to_fn (handle, name))
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dev.parse (name);
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else if (strcmp (name, ":sock:") == 0
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/* NtQueryObject returns an error when called on an LSP socket
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handle. fdsock tries to fetch the underlying base socket,
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but this might fail. */
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|| (strcmp (name, unknown_file) == 0
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&& !::getsockopt ((SOCKET) handle, SOL_SOCKET, SO_RCVBUF,
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(char *) &rcv, &len)))
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{
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/* socket */
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dev = *tcp_dev;
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name[0] = '\0';
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}
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else if (fd == 0)
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dev = *piper_dev;
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else
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dev = *pipew_dev;
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}
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else if (GetConsoleScreenBufferInfo (handle, &buf)
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|| GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf))
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{
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/* Console I/O */
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if (myself->ctty > 0)
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dev.parse (myself->ctty);
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else
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{
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dev.parse (FH_CONSOLE);
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CloseHandle (handle);
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handle = INVALID_HANDLE_VALUE;
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}
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}
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else if (GetCommState (handle, &dcb))
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/* FIXME: Not right - assumes ttyS0 */
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dev.parse (DEV_SERIAL_MAJOR, 0);
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else
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/* Try to figure it out from context - probably a disk file */
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handle_to_fn (handle, name);
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if (!name[0] && !dev)
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fds[fd] = NULL;
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else
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{
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fhandler_base *fh;
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if (dev)
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fh = build_fh_dev (dev);
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else
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fh = build_fh_name (name);
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if (!fh)
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return;
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if (name[0])
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{
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bin = fh->pc_binmode ();
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if (!bin)
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{
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bin = fh->get_default_fmode (O_RDWR);
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if (!bin && dev)
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bin = O_BINARY;
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}
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}
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IO_STATUS_BLOCK io;
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FILE_ACCESS_INFORMATION fai;
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int openflags = O_BINARY;
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/* Console windows are no kernel objects up to Windows 7/2008R2, so the
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access mask returned by NtQueryInformationFile is meaningless. CMD
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always hands down stdin handles as R/O handles, but our tty slave
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sides are R/W. */
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if (fh->is_tty ())
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{
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openflags |= O_RDWR;
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access |= GENERIC_READ | GENERIC_WRITE;
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}
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else if (!iscons_dev (dev)
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&& NT_SUCCESS (NtQueryInformationFile (handle, &io, &fai,
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sizeof fai,
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FileAccessInformation)))
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{
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if (fai.AccessFlags & FILE_WRITE_DATA)
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{
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openflags |= O_WRONLY;
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access |= GENERIC_WRITE;
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}
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if (fai.AccessFlags & FILE_READ_DATA)
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{
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openflags |= openflags & O_WRONLY ? O_RDWR : O_RDONLY;
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access |= GENERIC_READ;
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}
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}
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else if (fd == 0)
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{
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openflags |= O_RDONLY;
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access |= GENERIC_READ;
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}
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else
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{
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openflags |= O_WRONLY;
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access |= GENERIC_WRITE; /* Should be rdwr for stderr but not sure that's
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possible for some versions of handles */
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}
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if (!fh->init (handle, access, bin))
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api_fatal ("couldn't initialize fd %d for %s", fd, fh->get_name ());
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fh->open_setup (openflags);
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fh->usecount = 0;
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cygheap->fdtab[fd] = fh;
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cygheap->fdtab[fd]->inc_refcnt ();
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set_std_handle (fd);
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paranoid_printf ("fd %d, handle %p", fd, handle);
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}
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}
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#define cnew(name, ...) \
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({ \
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void* ptr = (void*) ccalloc (HEAP_FHANDLER, 1, sizeof (name)); \
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ptr ? new (ptr) name (__VA_ARGS__) : NULL; \
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})
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#define cnew_no_ctor(name, ...) \
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({ \
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void* ptr = (void*) ccalloc (HEAP_FHANDLER, 1, sizeof (name)); \
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ptr ? new (ptr) name (ptr) : NULL; \
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})
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fhandler_base *
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build_fh_name (const char *name, unsigned opt, suffix_info *si)
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{
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path_conv pc (name, opt | PC_NULLEMPTY | PC_POSIX, si);
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if (pc.error)
|
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{
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fhandler_base *fh = cnew (fhandler_nodevice);
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if (fh)
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fh->set_error (pc.error);
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set_errno (fh ? pc.error : EMFILE);
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return fh;
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}
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|
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return build_fh_pc (pc);
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}
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|
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fhandler_base *
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build_fh_dev (const device& dev, const char *unix_name)
|
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{
|
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path_conv pc (dev);
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if (unix_name)
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pc.set_posix (unix_name);
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else
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pc.set_posix (dev.name ());
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return build_fh_pc (pc);
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}
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|
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#define fh_unset ((fhandler_base *) 1)
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static device last_tty_dev;
|
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#define fh_last_tty_dev ((fhandler_termios *) cygheap->fdtab.find_archetype (last_tty_dev))
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|
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static fhandler_base *
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fh_alloc (path_conv& pc)
|
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{
|
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fhandler_base *fh = fh_unset;
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fhandler_base *fhraw = NULL;
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|
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switch (pc.dev.get_major ())
|
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{
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case DEV_PTYS_MAJOR:
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fh = cnew (fhandler_pty_slave, pc.dev.get_minor ());
|
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break;
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case DEV_PTYM_MAJOR:
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fh = cnew (fhandler_pty_master, pc.dev.get_minor ());
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break;
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case DEV_FLOPPY_MAJOR:
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case DEV_CDROM_MAJOR:
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case DEV_SD_MAJOR:
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case DEV_SD1_MAJOR ... DEV_SD7_MAJOR:
|
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case DEV_SD_HIGHPART_START ... DEV_SD_HIGHPART_END:
|
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fh = cnew (fhandler_dev_floppy);
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break;
|
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case DEV_TAPE_MAJOR:
|
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fh = cnew (fhandler_dev_tape);
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break;
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case DEV_SERIAL_MAJOR:
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fh = cnew (fhandler_serial);
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break;
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case DEV_CONS_MAJOR:
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fh = cnew (fhandler_console, pc.dev);
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break;
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default:
|
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switch ((dev_t) pc.dev)
|
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{
|
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case FH_CONSOLE:
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case FH_CONIN:
|
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case FH_CONOUT:
|
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fh = cnew (fhandler_console, pc.dev);
|
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break;
|
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case FH_PTMX:
|
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if (pc.isopen ())
|
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fh = cnew (fhandler_pty_master, -1);
|
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else
|
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fhraw = cnew_no_ctor (fhandler_pty_master, -1);
|
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break;
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case FH_WINDOWS:
|
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fh = cnew (fhandler_windows);
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break;
|
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case FH_FIFO:
|
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fh = cnew (fhandler_fifo);
|
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break;
|
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case FH_PIPE:
|
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case FH_PIPER:
|
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case FH_PIPEW:
|
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fh = cnew (fhandler_pipe);
|
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break;
|
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case FH_TCP:
|
|
case FH_UDP:
|
|
case FH_ICMP:
|
|
case FH_UNIX:
|
|
case FH_STREAM:
|
|
case FH_DGRAM:
|
|
fh = cnew (fhandler_socket);
|
|
break;
|
|
case FH_FS:
|
|
fh = cnew (fhandler_disk_file);
|
|
break;
|
|
case FH_NULL:
|
|
fh = cnew (fhandler_dev_null);
|
|
break;
|
|
case FH_ZERO:
|
|
case FH_FULL:
|
|
fh = cnew (fhandler_dev_zero);
|
|
break;
|
|
case FH_RANDOM:
|
|
case FH_URANDOM:
|
|
fh = cnew (fhandler_dev_random);
|
|
break;
|
|
case FH_CLIPBOARD:
|
|
fh = cnew (fhandler_dev_clipboard);
|
|
break;
|
|
case FH_OSS_DSP:
|
|
fh = cnew (fhandler_dev_dsp);
|
|
break;
|
|
case FH_PROC:
|
|
fh = cnew (fhandler_proc);
|
|
break;
|
|
case FH_REGISTRY:
|
|
fh = cnew (fhandler_registry);
|
|
break;
|
|
case FH_PROCESS:
|
|
case FH_PROCESSFD:
|
|
fh = cnew (fhandler_process);
|
|
break;
|
|
case FH_PROCNET:
|
|
fh = cnew (fhandler_procnet);
|
|
break;
|
|
case FH_PROCSYS:
|
|
fh = cnew (fhandler_procsys);
|
|
break;
|
|
case FH_PROCSYSVIPC:
|
|
fh = cnew (fhandler_procsysvipc);
|
|
break;
|
|
case FH_NETDRIVE:
|
|
fh = cnew (fhandler_netdrive);
|
|
break;
|
|
case FH_DEV:
|
|
fh = cnew (fhandler_dev);
|
|
break;
|
|
case FH_CYGDRIVE:
|
|
fh = cnew (fhandler_cygdrive);
|
|
break;
|
|
case FH_TTY:
|
|
if (!pc.isopen ())
|
|
{
|
|
fhraw = cnew_no_ctor (fhandler_console, -1);
|
|
debug_printf ("not called from open for /dev/tty");
|
|
}
|
|
else if (myself->ctty <= 0 && last_tty_dev
|
|
&& !myself->set_ctty (fh_last_tty_dev, 0))
|
|
debug_printf ("no /dev/tty assigned");
|
|
else if (myself->ctty > 0)
|
|
{
|
|
debug_printf ("determining /dev/tty assignment for ctty %p", myself->ctty);
|
|
if (iscons_dev (myself->ctty))
|
|
fh = cnew (fhandler_console, pc.dev);
|
|
else
|
|
fh = cnew (fhandler_pty_slave, myself->ctty);
|
|
if (fh->dev () != FH_NADA)
|
|
fh->set_name ("/dev/tty");
|
|
}
|
|
break;
|
|
case FH_KMSG:
|
|
fh = cnew (fhandler_mailslot);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If `fhraw' is set that means that this fhandler is just a dummy
|
|
set up for stat(). Mock it up for use by stat without actually
|
|
trying to do any real initialization. */
|
|
if (fhraw)
|
|
{
|
|
fh = fhraw;
|
|
fh->set_name (pc);
|
|
if (fh->use_archetype ())
|
|
fh->archetype = fh;
|
|
}
|
|
if (fh == fh_unset)
|
|
fh = cnew (fhandler_nodevice);
|
|
else if (fh->dev () == FH_ERROR)
|
|
{
|
|
if (!pc.isopen () && pc.dev.isfs ())
|
|
fh->dev () = pc.dev; /* Special case: This file actually exists on
|
|
disk and we're not trying to open it so just
|
|
return the info from pc. */
|
|
else
|
|
{
|
|
delete fh;
|
|
fh = NULL;
|
|
}
|
|
}
|
|
return fh;
|
|
}
|
|
|
|
fhandler_base *
|
|
build_fh_pc (path_conv& pc)
|
|
{
|
|
fhandler_base *fh = fh_alloc (pc);
|
|
|
|
if (!fh)
|
|
{
|
|
set_errno (ENXIO);
|
|
goto out;
|
|
}
|
|
|
|
if (!fh->use_archetype ())
|
|
fh->set_name (pc);
|
|
else if ((fh->archetype = cygheap->fdtab.find_archetype (fh->dev ())))
|
|
{
|
|
debug_printf ("found an archetype for %s(%d/%d) io_handle %p", fh->get_name (), fh->dev ().get_major (), fh->dev ().get_minor (),
|
|
fh->archetype->get_io_handle ());
|
|
if (!fh->get_name ())
|
|
fh->set_name (fh->archetype->dev ().name ());
|
|
}
|
|
else if (cygwin_finished_initializing && !pc.isopen ())
|
|
fh->set_name (pc);
|
|
else
|
|
{
|
|
if (!fh->get_name ())
|
|
fh->set_name (fh->dev ().native ());
|
|
fh->archetype = fh->clone ();
|
|
debug_printf ("created an archetype (%p) for %s(%d/%d)", fh->archetype, fh->get_name (), fh->dev ().get_major (), fh->dev ().get_minor ());
|
|
fh->archetype->archetype = NULL;
|
|
*cygheap->fdtab.add_archetype () = fh->archetype;
|
|
}
|
|
|
|
|
|
/* Keep track of the last tty-like thing opened. We could potentially want
|
|
to open it if /dev/tty is referenced. */
|
|
if (myself->ctty > 0 || !fh->is_tty () || !pc.isctty_capable ())
|
|
last_tty_dev = FH_NADA;
|
|
else
|
|
last_tty_dev = fh->dev ();
|
|
|
|
out:
|
|
debug_printf ("fh %p, dev %08x", fh, fh ? (dev_t) fh->dev () : 0);
|
|
return fh;
|
|
}
|
|
|
|
fhandler_base *
|
|
dtable::dup_worker (fhandler_base *oldfh, int flags)
|
|
{
|
|
/* Don't call set_name in build_fh_pc. It will be called in
|
|
fhandler_base::operator= below. Calling it twice will result
|
|
in double allocation. */
|
|
fhandler_base *newfh = oldfh->clone ();
|
|
if (!newfh)
|
|
debug_printf ("build_fh_pc failed");
|
|
else
|
|
{
|
|
if (!oldfh->archetype)
|
|
newfh->set_io_handle (NULL);
|
|
|
|
newfh->pc.reset_conv_handle ();
|
|
if (oldfh->dup (newfh, flags))
|
|
{
|
|
delete newfh;
|
|
newfh = NULL;
|
|
debug_printf ("oldfh->dup failed");
|
|
}
|
|
else
|
|
{
|
|
/* Don't increment refcnt here since we don't know if this is a
|
|
allocated fd. So we leave this chore to the caller. */
|
|
|
|
newfh->usecount = 0;
|
|
newfh->archetype_usecount (1);
|
|
|
|
/* The O_CLOEXEC flag enforces close-on-exec behaviour. */
|
|
newfh->set_close_on_exec (!!(flags & O_CLOEXEC));
|
|
debug_printf ("duped '%s' old %p, new %p", oldfh->get_name (),
|
|
oldfh->get_io_handle (), newfh->get_io_handle ());
|
|
}
|
|
}
|
|
return newfh;
|
|
}
|
|
|
|
int
|
|
dtable::dup3 (int oldfd, int newfd, int flags)
|
|
{
|
|
int res = -1;
|
|
fhandler_base *newfh = NULL; // = NULL to avoid an incorrect warning
|
|
|
|
debug_printf ("dup3 (%d, %d, %y)", oldfd, newfd, flags);
|
|
lock ();
|
|
bool do_unlock = true;
|
|
bool unlock_on_return;
|
|
if (!(flags & O_EXCL))
|
|
unlock_on_return = true; /* Relinquish lock on return */
|
|
else
|
|
{
|
|
flags &= ~O_EXCL;
|
|
unlock_on_return = false; /* Return with lock set on success */
|
|
}
|
|
|
|
if (not_open (oldfd))
|
|
{
|
|
syscall_printf ("fd %d not open", oldfd);
|
|
set_errno (EBADF);
|
|
goto done;
|
|
}
|
|
if (newfd >= OPEN_MAX_MAX || newfd < 0)
|
|
{
|
|
syscall_printf ("new fd out of bounds: %d", newfd);
|
|
set_errno (EBADF);
|
|
goto done;
|
|
}
|
|
if ((flags & ~O_CLOEXEC) != 0)
|
|
{
|
|
syscall_printf ("invalid flags value %y", flags);
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
/* This is a temporary kludge until all utilities can catch up with
|
|
a change in behavior that implements linux functionality: opening
|
|
a tty should not automatically cause it to become the controlling
|
|
tty for the process. */
|
|
if (newfd > 2)
|
|
flags |= O_NOCTTY;
|
|
|
|
if ((newfh = dup_worker (fds[oldfd], flags)) == NULL)
|
|
{
|
|
res = -1;
|
|
goto done;
|
|
}
|
|
|
|
debug_printf ("newfh->io_handle %p, oldfh->io_handle %p, new win32_name %p, old win32_name %p",
|
|
newfh->get_io_handle (), fds[oldfd]->get_io_handle (), newfh->get_win32_name (), fds[oldfd]->get_win32_name ());
|
|
|
|
if (!not_open (newfd))
|
|
close (newfd);
|
|
else if ((size_t) newfd >= size
|
|
&& find_unused_handle (newfd) < 0)
|
|
/* couldn't extend fdtab */
|
|
{
|
|
newfh->close ();
|
|
res = -1;
|
|
goto done;
|
|
}
|
|
|
|
fds[newfd] = newfh;
|
|
|
|
if ((res = newfd) <= 2)
|
|
set_std_handle (res);
|
|
do_unlock = unlock_on_return;
|
|
|
|
done:
|
|
if (do_unlock)
|
|
unlock ();
|
|
syscall_printf ("%R = dup3(%d, %d, %y)", res, oldfd, newfd, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
bool
|
|
dtable::select_read (int fd, select_stuff *ss)
|
|
{
|
|
if (not_open (fd))
|
|
{
|
|
set_errno (EBADF);
|
|
return false;
|
|
}
|
|
fhandler_base *fh = fds[fd];
|
|
select_record *s = fh->select_read (ss);
|
|
s->fd = fd;
|
|
if (!s->fh)
|
|
s->fh = fh;
|
|
s->thread_errno = 0;
|
|
debug_printf ("%s fd %d", fh->get_name (), fd);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
dtable::select_write (int fd, select_stuff *ss)
|
|
{
|
|
if (not_open (fd))
|
|
{
|
|
set_errno (EBADF);
|
|
return NULL;
|
|
}
|
|
fhandler_base *fh = fds[fd];
|
|
select_record *s = fh->select_write (ss);
|
|
s->fd = fd;
|
|
s->fh = fh;
|
|
s->thread_errno = 0;
|
|
debug_printf ("%s fd %d", fh->get_name (), fd);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
dtable::select_except (int fd, select_stuff *ss)
|
|
{
|
|
if (not_open (fd))
|
|
{
|
|
set_errno (EBADF);
|
|
return NULL;
|
|
}
|
|
fhandler_base *fh = fds[fd];
|
|
select_record *s = fh->select_except (ss);
|
|
s->fd = fd;
|
|
s->fh = fh;
|
|
s->thread_errno = 0;
|
|
debug_printf ("%s fd %d", fh->get_name (), fd);
|
|
return true;
|
|
}
|
|
|
|
void
|
|
dtable::move_fd (int from, int to)
|
|
{
|
|
// close (to); /* It is assumed that this is close-on-exec */
|
|
fds[to] = fds[from];
|
|
fds[from] = NULL;
|
|
}
|
|
|
|
void
|
|
dtable::set_file_pointers_for_exec ()
|
|
{
|
|
/* This is not POSIX-compliant so the function is only called for
|
|
non-Cygwin processes. */
|
|
LONG off_high = 0;
|
|
lock ();
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL && fh->get_flags () & O_APPEND)
|
|
SetFilePointer (fh->get_handle (), 0, &off_high, FILE_END);
|
|
unlock ();
|
|
}
|
|
|
|
void
|
|
dtable::fixup_close (size_t i, fhandler_base *fh)
|
|
{
|
|
if (fh->archetype)
|
|
{
|
|
debug_printf ("closing fd %d since it is an archetype", i);
|
|
fh->close_with_arch ();
|
|
}
|
|
release (i);
|
|
}
|
|
|
|
void
|
|
dtable::fixup_after_exec ()
|
|
{
|
|
first_fd_for_open = 0;
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
fh->clear_readahead ();
|
|
fh->fixup_after_exec ();
|
|
/* Close the handle if it's close-on-exec or if an error was detected
|
|
(typically with opening a console in a gui app) by fixup_after_exec.
|
|
*/
|
|
if (fh->close_on_exec () || (!fh->nohandle () && !fh->get_io_handle ()))
|
|
fixup_close (i, fh);
|
|
else if (fh->get_popen_pid ())
|
|
close (i);
|
|
else if (i == 0)
|
|
SetStdHandle (std_consts[i], fh->get_io_handle ());
|
|
else if (i <= 2)
|
|
SetStdHandle (std_consts[i], fh->get_output_handle ());
|
|
}
|
|
}
|
|
|
|
void
|
|
dtable::fixup_after_fork (HANDLE parent)
|
|
{
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
if (fh->close_on_exec () || fh->need_fork_fixup ())
|
|
{
|
|
debug_printf ("fd %d (%s)", i, fh->get_name ());
|
|
fh->fixup_after_fork (parent);
|
|
if (!fh->nohandle () && !fh->get_io_handle ())
|
|
{
|
|
/* This should actually never happen but it's here to make sure
|
|
we don't crash due to access of an unopened file handle. */
|
|
fixup_close (i, fh);
|
|
continue;
|
|
}
|
|
}
|
|
if (i == 0)
|
|
SetStdHandle (std_consts[i], fh->get_io_handle ());
|
|
else if (i <= 2)
|
|
SetStdHandle (std_consts[i], fh->get_output_handle ());
|
|
}
|
|
}
|
|
|
|
static void
|
|
decode_tty (char *buf, WCHAR *w32)
|
|
{
|
|
int ttyn = wcstol (w32, NULL, 10);
|
|
__ptsname (buf, ttyn);
|
|
}
|
|
|
|
/* Try to derive posix filename from given handle. Return true if
|
|
the handle is associated with a cygwin tty. */
|
|
static bool
|
|
handle_to_fn (HANDLE h, char *posix_fn)
|
|
{
|
|
tmp_pathbuf tp;
|
|
ULONG len = 0;
|
|
WCHAR *maxmatchdos = NULL;
|
|
PWCHAR device = tp.w_get ();
|
|
int maxmatchlen = 0;
|
|
OBJECT_NAME_INFORMATION *ntfn = (OBJECT_NAME_INFORMATION *) tp.w_get ();
|
|
|
|
NTSTATUS status = NtQueryObject (h, ObjectNameInformation, ntfn, 65536, &len);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("NtQueryObject failed, %y", status);
|
|
// NT seems to do this on an unopened file
|
|
else if (!ntfn->Name.Buffer)
|
|
debug_printf ("nt->Name.Buffer == NULL");
|
|
else
|
|
{
|
|
WCHAR *w32 = ntfn->Name.Buffer;
|
|
size_t w32len = ntfn->Name.Length / sizeof (WCHAR);
|
|
w32[w32len] = L'\0';
|
|
|
|
if (wcscasecmp (w32, DEV_NULL) == 0)
|
|
{
|
|
strcpy (posix_fn, "/dev/null");
|
|
return false;
|
|
}
|
|
|
|
if (wcscasecmp (w32, DEV_SOCKET) == 0)
|
|
{
|
|
strcpy (posix_fn, ":sock:");
|
|
return false;
|
|
}
|
|
|
|
if (wcsncasecmp (w32, DEV_NAMED_PIPE, DEV_NAMED_PIPE_LEN) == 0)
|
|
{
|
|
w32 += DEV_NAMED_PIPE_LEN;
|
|
if (wcsncmp (w32, L"cygwin-", WCLEN (L"cygwin-")) != 0)
|
|
return false;
|
|
w32 += WCLEN (L"cygwin-");
|
|
/* Check for installation key and trailing dash. */
|
|
w32len = cygheap->installation_key.Length / sizeof (WCHAR);
|
|
if (w32len
|
|
&& wcsncmp (w32, cygheap->installation_key.Buffer, w32len) != 0)
|
|
return false;
|
|
w32 += w32len;
|
|
if (*w32 != L'-')
|
|
return false;
|
|
++w32;
|
|
bool istty = wcsncmp (w32, L"pty", WCLEN (L"pty")) == 0;
|
|
if (istty)
|
|
decode_tty (posix_fn, w32 + WCLEN (L"pty"));
|
|
else if (wcsncmp (w32, L"pipe", WCLEN (L"pipe")) == 0)
|
|
strcpy (posix_fn, "/dev/pipe");
|
|
return istty;
|
|
}
|
|
|
|
WCHAR fnbuf[64 * 1024];
|
|
if (wcsncasecmp (w32, DEVICE_PREFIX, DEVICE_PREFIX_LEN) != 0
|
|
|| !QueryDosDeviceW (NULL, fnbuf, sizeof (fnbuf) / sizeof (WCHAR)))
|
|
{
|
|
sys_wcstombs (posix_fn, NT_MAX_PATH, w32, w32len);
|
|
return false;
|
|
}
|
|
|
|
for (WCHAR *s = fnbuf; *s; s = wcschr (s, '\0') + 1)
|
|
{
|
|
if (!QueryDosDeviceW (s, device, NT_MAX_PATH))
|
|
continue;
|
|
if (wcschr (s, ':') == NULL)
|
|
continue;
|
|
WCHAR *q = wcsrchr (device, ';');
|
|
if (q)
|
|
{
|
|
WCHAR *r = wcschr (q, '\\');
|
|
if (r)
|
|
wcscpy (q, r + 1);
|
|
}
|
|
int devlen = wcslen (device);
|
|
if (device[devlen - 1] == L'\\')
|
|
device[--devlen] = L'\0';
|
|
if (devlen < maxmatchlen)
|
|
continue;
|
|
if (wcsncmp (device, w32, devlen) != 0||
|
|
(w32[devlen] != L'\0' && w32[devlen] != L'\\'))
|
|
continue;
|
|
maxmatchlen = devlen;
|
|
maxmatchdos = s;
|
|
debug_printf ("current match '%W' = '%W'\n", s, device);
|
|
}
|
|
|
|
if (maxmatchlen)
|
|
{
|
|
WCHAR *p = wcschr (w32 + DEVICE_PREFIX_LEN, L'\\');
|
|
size_t n = wcslen (maxmatchdos);
|
|
WCHAR ch;
|
|
if (!p)
|
|
ch = L'\0';
|
|
else
|
|
{
|
|
if (maxmatchdos[n - 1] == L'\\')
|
|
n--;
|
|
w32 += maxmatchlen - n;
|
|
ch = L'\\';
|
|
}
|
|
memcpy (w32, maxmatchdos, n * sizeof (WCHAR));
|
|
w32[n] = ch;
|
|
}
|
|
else if (wcsncmp (w32, DEV_REMOTE, DEV_REMOTE_LEN) == 0)
|
|
{
|
|
w32 += DEV_REMOTE_LEN - 2;
|
|
*w32 = L'\\';
|
|
debug_printf ("remote drive");
|
|
}
|
|
else if (wcsncmp (w32, DEV_REMOTE1, DEV_REMOTE1_LEN) == 0)
|
|
{
|
|
w32 += DEV_REMOTE1_LEN - 2;
|
|
*w32 = L'\\';
|
|
debug_printf ("remote drive");
|
|
}
|
|
|
|
cygwin_conv_path (CCP_WIN_W_TO_POSIX | CCP_ABSOLUTE, w32, posix_fn,
|
|
NT_MAX_PATH);
|
|
|
|
debug_printf ("derived path '%W', posix '%s'", w32, posix_fn);
|
|
return false;
|
|
}
|
|
|
|
strcpy (posix_fn, unknown_file);
|
|
return false;
|
|
}
|
|
|
|
void
|
|
dtable::fixup_before_fork (DWORD target_proc_id)
|
|
{
|
|
lock ();
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
debug_printf ("fd %d (%s)", i, fh->get_name ());
|
|
fh->fixup_before_fork_exec (target_proc_id);
|
|
}
|
|
unlock ();
|
|
}
|
|
|
|
void
|
|
dtable::fixup_before_exec (DWORD target_proc_id)
|
|
{
|
|
lock ();
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL && !fh->close_on_exec ())
|
|
{
|
|
debug_printf ("fd %d (%s)", i, fh->get_name ());
|
|
fh->fixup_before_fork_exec (target_proc_id);
|
|
}
|
|
unlock ();
|
|
}
|