diff options
Diffstat (limited to 'winsup/cygwin/dtable.cc')
| -rw-r--r-- | winsup/cygwin/dtable.cc | 790 |
1 files changed, 0 insertions, 790 deletions
diff --git a/winsup/cygwin/dtable.cc b/winsup/cygwin/dtable.cc deleted file mode 100644 index 4f2b544a6..000000000 --- a/winsup/cygwin/dtable.cc +++ /dev/null @@ -1,790 +0,0 @@ -/* dtable.cc: file descriptor support. - - Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. - -This file is part of Cygwin. - -This software is a copyrighted work licensed under the terms of the -Cygwin license. Please consult the file "CYGWIN_LICENSE" for -details. */ - -#define __INSIDE_CYGWIN_NET__ - -#include "winsup.h" -#include <errno.h> -#include <sys/socket.h> -#include <stdlib.h> -#include <stdio.h> -#include <unistd.h> -#include <sys/cygwin.h> -#include <assert.h> -#include <ntdef.h> -#include <winnls.h> - -#define USE_SYS_TYPES_FD_SET -#include <winsock.h> -#include "pinfo.h" -#include "cygerrno.h" -#include "perprocess.h" -#include "security.h" -#include "fhandler.h" -#include "path.h" -#include "dtable.h" -#include "cygheap.h" -#include "ntdll.h" - -static const NO_COPY DWORD std_consts[] = {STD_INPUT_HANDLE, STD_OUTPUT_HANDLE, - STD_ERROR_HANDLE}; - -static char *handle_to_fn (HANDLE, char *); - -/* Set aside space for the table of fds */ -void -dtable_init (void) -{ - if (!cygheap->fdtab.size) - cygheap->fdtab.extend (NOFILE_INCR); -} - -void __stdcall -set_std_handle (int fd) -{ - if (fd == 0) - SetStdHandle (std_consts[fd], cygheap->fdtab[fd]->get_handle ()); - else if (fd <= 2) - SetStdHandle (std_consts[fd], cygheap->fdtab[fd]->get_output_handle ()); -} - -void -dtable::dec_console_fds () -{ - if (console_fds > 0 && !--console_fds && - myself->ctty != TTY_CONSOLE && !check_pty_fds()) - FreeConsole (); -} - -int -dtable::extend (int howmuch) -{ - int new_size = size + howmuch; - fhandler_base **newfds; - - if (howmuch <= 0) - return 0; - - /* Try to allocate more space for fd table. We can't call realloc () - here to preserve old table if memory allocation fails */ - - if (!(newfds = (fhandler_base **) ccalloc (HEAP_ARGV, new_size, sizeof newfds[0]))) - { - debug_printf ("calloc failed"); - return 0; - } - if (fds) - { - memcpy (newfds, fds, size * sizeof (fds[0])); - cfree (fds); - } - - size = new_size; - fds = newfds; - debug_printf ("size %d, fds %p", size, fds); - return 1; -} - -void -dtable::get_debugger_info () -{ - if (being_debugged ()) - { - char std[3][sizeof ("/dev/ttyNNNN")]; - std[0][0] = std[1][0] = std [2][0] = '\0'; - char buf[sizeof ("cYgstd %x") + 32]; - sprintf (buf, "cYgstd %x %x %x", (unsigned) &std, sizeof (std[0]), 3); - OutputDebugString (buf); - for (int i = 0; i < 3; i++) - if (std[i][0]) - { - path_conv pc; - HANDLE h = GetStdHandle (std_consts[i]); - fhandler_base *fh = build_fhandler_from_name (i, std[i], NULL, pc); - if (!fh) - continue; - if (!fh->open (&pc, (i ? O_WRONLY : O_RDONLY) | O_BINARY, 0777)) - release (i); - else - CloseHandle (h); - } - } -} - -/* Initialize the file descriptor/handle mapping table. - This function should only be called when a cygwin function is invoked - by a non-cygwin function, i.e., it should only happen very rarely. */ - -void -dtable::stdio_init () -{ - extern void set_console_ctty (); - /* Set these before trying to output anything from strace. - Also, always set them even if we're to pick up our parent's fds - in case they're missed. */ - - if (myself->ppid_handle || ISSTATE (myself, PID_CYGPARENT)) - return; - - HANDLE in = GetStdHandle (STD_INPUT_HANDLE); - HANDLE out = GetStdHandle (STD_OUTPUT_HANDLE); - HANDLE err = GetStdHandle (STD_ERROR_HANDLE); - - init_std_file_from_handle (0, in, GENERIC_READ); - - /* STD_ERROR_HANDLE has been observed to be the same as - STD_OUTPUT_HANDLE. We need separate handles (e.g. using pipes - to pass data from child to parent). */ - if (out == err) - { - /* Since this code is not invoked for forked tasks, we don't have - to worry about the close-on-exec flag here. */ - if (!DuplicateHandle (hMainProc, out, hMainProc, &err, 0, - 1, DUPLICATE_SAME_ACCESS)) - { - /* If that fails, do this as a fall back. */ - err = out; - system_printf ("couldn't make stderr distinct from stdout"); - } - } - - init_std_file_from_handle (1, out, GENERIC_WRITE); - init_std_file_from_handle (2, err, GENERIC_WRITE); - /* Assign the console as the controlling tty for this process if we actually - have a console and no other controlling tty has been assigned. */ - if (myself->ctty < 0 && GetConsoleCP () > 0) - set_console_ctty (); -} - -int -dtable::find_unused_handle (int start) -{ - AssertResourceOwner (LOCK_FD_LIST, READ_LOCK); - do - { - for (size_t i = start; i < size; i++) - /* See if open -- no need for overhead of not_open */ - if (fds[i] == NULL) - return i; - } - while (extend (NOFILE_INCR)); - return -1; -} - -void -dtable::release (int fd) -{ - if (!not_open (fd)) - { - switch (fds[fd]->get_device ()) - { - case FH_SOCKET: - dec_need_fixup_before (); - break; - case FH_CONSOLE: - dec_console_fds (); - break; - } - delete fds[fd]; - fds[fd] = NULL; - } -} - -extern "C" int -cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin, - DWORD myaccess) -{ - if (fd == -1) - fd = cygheap->fdtab.find_unused_handle (); - path_conv pc; - fhandler_base *res = cygheap->fdtab.build_fhandler_from_name (fd, name, handle, - pc); - res->init (handle, myaccess, bin ?: pc.binmode ()); - return fd; -} - -void -dtable::init_std_file_from_handle (int fd, HANDLE handle, DWORD myaccess) -{ - const char *name; - CONSOLE_SCREEN_BUFFER_INFO buf; - struct sockaddr sa; - int sal = sizeof (sa); - DCB dcb; - - first_fd_for_open = 0; - - if (!not_open (fd)) - return; - - SetLastError (0); - DWORD ft = GetFileType (handle); - if (ft == FILE_TYPE_UNKNOWN && GetLastError () == ERROR_INVALID_HANDLE) - name = NULL; - else - { - /* See if we can consoleify it */ - if (GetConsoleScreenBufferInfo (handle, &buf)) - { - if (ISSTATE (myself, PID_USETTY)) - name = "/dev/tty"; - else - name = "/dev/conout"; - } - else if (GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf)) - { - if (ISSTATE (myself, PID_USETTY)) - name = "/dev/tty"; - else - name = "/dev/conin"; - } - else if (ft == FILE_TYPE_PIPE) - { - if (fd == 0) - name = "/dev/piper"; - else - name = "/dev/pipew"; - } - else if (wsock_started && getpeername ((SOCKET) handle, &sa, &sal) == 0) - name = "/dev/socket"; - else if (GetCommState (handle, &dcb)) - name = "/dev/ttyS0"; // FIXME - determine correct device - else - name = handle_to_fn (handle, (char *) alloca (MAX_PATH + 100)); - } - - if (!name) - fds[fd] = NULL; - else - { - path_conv pc; - build_fhandler_from_name (fd, name, handle, pc)->init (handle, myaccess, - pc.binmode ()); - set_std_handle (fd); - paranoid_printf ("fd %d, handle %p", fd, handle); - } -} - -fhandler_base * -dtable::build_fhandler_from_name (int fd, const char *name, HANDLE handle, - path_conv& pc, unsigned opt, suffix_info *si) -{ - pc.check (name, opt | PC_NULLEMPTY | PC_FULL | PC_POSIX, si); - if (pc.error) - { - set_errno (pc.error); - return NULL; - } - - if (!pc.exists () && handle) - pc.fillin (handle); - - fhandler_base *fh = build_fhandler (fd, pc.get_devn (), - pc.return_and_clear_normalized_path (), - pc, pc.get_unitn ()); - return fh; -} - -fhandler_base * -dtable::build_fhandler (int fd, DWORD dev, const char *unix_name, - const char *win32_name, int unit) -{ - return build_fhandler (fd, dev, cstrdup (unix_name), win32_name, unit); -} - -#define cnew(name) new ((void *) ccalloc (HEAP_FHANDLER, 1, sizeof (name))) name -fhandler_base * -dtable::build_fhandler (int fd, DWORD dev, char *unix_name, - const char *win32_name, int unit) -{ - fhandler_base *fh; - - dev &= FH_DEVMASK; - switch (dev) - { - case FH_TTYM: - fh = cnew (fhandler_tty_master) (unit); - break; - case FH_CONSOLE: - case FH_CONIN: - case FH_CONOUT: - if ((fh = cnew (fhandler_console) ())) - inc_console_fds (); - break; - case FH_PTYM: - fh = cnew (fhandler_pty_master) (); - break; - case FH_TTYS: - if (unit < 0) - fh = cnew (fhandler_tty_slave) (); - else - fh = cnew (fhandler_tty_slave) (unit); - break; - case FH_WINDOWS: - fh = cnew (fhandler_windows) (); - break; - case FH_SERIAL: - fh = cnew (fhandler_serial) (unit); - break; - case FH_PIPE: - case FH_PIPER: - case FH_PIPEW: - fh = cnew (fhandler_pipe) (dev); - break; - case FH_SOCKET: - if ((fh = cnew (fhandler_socket) ())) - inc_need_fixup_before (); - break; - case FH_DISK: - fh = cnew (fhandler_disk_file) (); - break; - case FH_CYGDRIVE: - fh = cnew (fhandler_cygdrive) (unit); - break; - case FH_FLOPPY: - fh = cnew (fhandler_dev_floppy) (unit); - break; - case FH_TAPE: - fh = cnew (fhandler_dev_tape) (unit); - break; - case FH_NULL: - fh = cnew (fhandler_dev_null) (); - break; - case FH_ZERO: - fh = cnew (fhandler_dev_zero) (); - break; - case FH_RANDOM: - fh = cnew (fhandler_dev_random) (unit); - break; - case FH_MEM: - fh = cnew (fhandler_dev_mem) (unit); - 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: - fh = cnew (fhandler_process) (); - break; - default: - system_printf ("internal error -- unknown device - %p", dev); - fh = NULL; - } - - if (unix_name) - { - char new_win32_name[strlen (unix_name) + 1]; - if (!win32_name) - { - char *p; - /* FIXME: ? Should we call win32_device_name here? - It seems like overkill, but... */ - win32_name = strcpy (new_win32_name, unix_name); - for (p = (char *) win32_name; (p = strchr (p, '/')); p++) - *p = '\\'; - } - fh->set_name (unix_name, win32_name, fh->get_unit ()); - } - debug_printf ("fd %d, fh %p", fd, fh); - return fd >= 0 ? (fds[fd] = fh) : fh; -} - -fhandler_base * -dtable::dup_worker (fhandler_base *oldfh) -{ - fhandler_base *newfh = build_fhandler (-1, oldfh->get_device ()); - *newfh = *oldfh; - newfh->set_io_handle (NULL); - if (oldfh->dup (newfh)) - { - cfree (newfh); - newfh = NULL; - return NULL; - } - - newfh->set_close_on_exec_flag (0); - MALLOC_CHECK; - debug_printf ("duped '%s' old %p, new %p", oldfh->get_name (), oldfh->get_io_handle (), newfh->get_io_handle ()); - return newfh; -} - -int -dtable::dup2 (int oldfd, int newfd) -{ - int res = -1; - fhandler_base *newfh = NULL; // = NULL to avoid an incorrect warning - - MALLOC_CHECK; - debug_printf ("dup2 (%d, %d)", oldfd, newfd); - SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup"); - - if (not_open (oldfd)) - { - syscall_printf ("fd %d not open", oldfd); - set_errno (EBADF); - goto done; - } - - if (newfd < 0) - { - syscall_printf ("new fd out of bounds: %d", newfd); - set_errno (EBADF); - goto done; - } - - if (newfd == oldfd) - { - res = 0; - goto done; - } - - if ((newfh = dup_worker (fds[oldfd])) == NULL) - { - res = -1; - goto done; - } - - debug_printf ("newfh->io_handle %p, oldfh->io_handle %p", - newfh->get_io_handle (), fds[oldfd]->get_io_handle ()); - - if (!not_open (newfd)) - _close (newfd); - else if ((size_t) newfd < size) - /* nothing to do */; - else if (find_unused_handle (newfd) < 0) - { - newfh->close (); - res = -1; - goto done; - } - - fds[newfd] = newfh; - - if ((res = newfd) <= 2) - set_std_handle (res); - -done: - MALLOC_CHECK; - ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup"); - syscall_printf ("%d = dup2 (%d, %d)", res, oldfd, newfd); - - return res; -} - -select_record * -dtable::select_read (int fd, select_record *s) -{ - if (not_open (fd)) - { - set_errno (EBADF); - return NULL; - } - fhandler_base *fh = fds[fd]; - s = fh->select_read (s); - s->fd = fd; - s->fh = fh; - s->saw_error = 0; - debug_printf ("%s fd %d", fh->get_name (), fd); - return s; -} - -select_record * -dtable::select_write (int fd, select_record *s) -{ - if (not_open (fd)) - { - set_errno (EBADF); - return NULL; - } - fhandler_base *fh = fds[fd]; - s = fh->select_write (s); - s->fd = fd; - s->fh = fh; - s->saw_error = 0; - debug_printf ("%s fd %d", fh->get_name (), fd); - return s; -} - -select_record * -dtable::select_except (int fd, select_record *s) -{ - if (not_open (fd)) - { - set_errno (EBADF); - return NULL; - } - fhandler_base *fh = fds[fd]; - s = fh->select_except (s); - s->fd = fd; - s->fh = fh; - s->saw_error = 0; - debug_printf ("%s fd %d", fh->get_name (), fd); - return s; -} - -/* Function to walk the fd table after an exec and perform - per-fhandler type fixups. */ -void -dtable::fixup_before_fork (DWORD target_proc_id) -{ - SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "fixup_before_fork"); - 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); - } - ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "fixup_before_fork"); -} - -void -dtable::fixup_before_exec (DWORD target_proc_id) -{ - SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "fixup_before_exec"); - fhandler_base *fh; - for (size_t i = 0; i < size; i++) - if ((fh = fds[i]) != NULL && !fh->get_close_on_exec ()) - { - debug_printf ("fd %d (%s)", i, fh->get_name ()); - fh->fixup_before_fork_exec (target_proc_id); - } - ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "fixup_before_exec"); -} - -void -dtable::fixup_after_exec (HANDLE parent) -{ - first_fd_for_open = 0; - fhandler_base *fh; - for (size_t i = 0; i < size; i++) - if ((fh = fds[i]) != NULL) - { - fh->clear_readahead (); - if (fh->get_close_on_exec ()) - release (i); - else - { - fh->fixup_after_exec (parent); - 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->get_close_on_exec () || fh->get_need_fork_fixup ()) - { - debug_printf ("fd %d (%s)", i, fh->get_name ()); - fh->fixup_after_fork (parent); - } - if (i == 0) - SetStdHandle (std_consts[i], fh->get_io_handle ()); - else if (i <= 2) - SetStdHandle (std_consts[i], fh->get_output_handle ()); - } -} - -int -dtable::vfork_child_dup () -{ - fhandler_base **newtable; - SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup"); - newtable = (fhandler_base **) ccalloc (HEAP_ARGV, size, sizeof (fds[0])); - int res = 1; - - /* Remove impersonation */ - if (cygheap->user.issetuid ()) - RevertToSelf (); - - for (size_t i = 0; i < size; i++) - if (not_open (i)) - continue; - else if ((newtable[i] = dup_worker (fds[i])) != NULL) - newtable[i]->set_close_on_exec (fds[i]->get_close_on_exec ()); - else - { - res = 0; - set_errno (EBADF); - goto out; - } - - fds_on_hold = fds; - fds = newtable; - -out: - /* Restore impersonation */ - if (cygheap->user.issetuid ()) - ImpersonateLoggedOnUser (cygheap->user.token); - - ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup"); - return 1; -} - -void -dtable::vfork_parent_restore () -{ - SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "restore"); - - close_all_files (); - fhandler_base **deleteme = fds; - assert (fds_on_hold != NULL); - fds = fds_on_hold; - fds_on_hold = NULL; - cfree (deleteme); - - ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "restore"); - return; -} - -void -dtable::vfork_child_fixup () -{ - if (!fds_on_hold) - return; - debug_printf ("here"); - fhandler_base **saveme = fds; - fds = fds_on_hold; - - fhandler_base *fh; - for (int i = 0; i < (int) cygheap->fdtab.size; i++) - if ((fh = cygheap->fdtab[i]) != NULL) - { - fh->clear_readahead (); - if (fh->get_close_on_exec ()) - release (i); - else - { - fh->close (); - cygheap->fdtab.release (i); - } - } - - fds = saveme; - cfree (fds_on_hold); - fds_on_hold = NULL; - - return; -} - -#define DEVICE_PREFIX "\\device\\" -#define DEVICE_PREFIX_LEN sizeof (DEVICE_PREFIX) - 1 -#define REMOTE "\\Device\\LanmanRedirector\\" -#define REMOTE_LEN sizeof (REMOTE) - 1 - -static char * -handle_to_fn (HANDLE h, char *posix_fn) -{ - OBJECT_NAME_INFORMATION *ntfn; - char fnbuf[32768]; - - memset (fnbuf, 0, sizeof (fnbuf)); - ntfn = (OBJECT_NAME_INFORMATION *) fnbuf; - ntfn->Name.MaximumLength = sizeof (fnbuf) - sizeof (*ntfn); - ntfn->Name.Buffer = (WCHAR *) (ntfn + 1); - - DWORD res = NtQueryObject (h, ObjectNameInformation, ntfn, sizeof (fnbuf), NULL); - - if (res) - { - strcpy (posix_fn, "some disk file"); - debug_printf ("NtQueryObject failed"); - return posix_fn; - } - - // NT seems to do this on an unopened file - if (!ntfn->Name.Buffer) - { - debug_printf ("nt->Name.Buffer == NULL"); - return NULL; - } - - ntfn->Name.Buffer[ntfn->Name.Length / sizeof (WCHAR)] = 0; - - char win32_fn[MAX_PATH + 100]; - sys_wcstombs (win32_fn, ntfn->Name.Buffer, ntfn->Name.Length); - debug_printf ("nt name '%s'", win32_fn); - if (!strncasematch (win32_fn, DEVICE_PREFIX, DEVICE_PREFIX_LEN) - || !QueryDosDevice (NULL, fnbuf, sizeof (fnbuf))) - return strcpy (posix_fn, win32_fn); - - char *p = strchr (win32_fn + DEVICE_PREFIX_LEN, '\\'); - if (!p) - p = strchr (win32_fn + DEVICE_PREFIX_LEN, '\0'); - - int n = p - win32_fn; - int maxmatchlen = 0; - char *maxmatchdos = NULL; - for (char *s = fnbuf; *s; s = strchr (s, '\0') + 1) - { - char device[MAX_PATH + 10]; - device[MAX_PATH + 9] = '\0'; - if (strchr (s, ':') == NULL) - continue; - if (!QueryDosDevice (s, device, sizeof (device) - 1)) - continue; - char *q = strrchr (device, ';'); - if (q) - { - char *r = strchr (q, '\\'); - if (r) - strcpy (q, r + 1); - } - int devlen = strlen (device); - if (device[devlen - 1] == '\\') - device[--devlen] = '\0'; - if (devlen < maxmatchlen) - continue; - if (!strncasematch (device, win32_fn, devlen) || - (win32_fn[devlen] != '\0' && win32_fn[devlen] != '\\')) - continue; - maxmatchlen = devlen; - maxmatchdos = s; - debug_printf ("current match '%s'", device); - } - - char *w32 = win32_fn; - if (maxmatchlen) - { - n = strlen (maxmatchdos); - if (maxmatchdos[n - 1] == '\\') - n--; - w32 += maxmatchlen - n; - memcpy (w32, maxmatchdos, n); - w32[n] = '\\'; - } - else if (strncasematch (w32, REMOTE, REMOTE_LEN)) - { - w32 += REMOTE_LEN - 2; - *w32 = '\\'; - debug_printf ("remote drive"); - } - - - debug_printf ("derived path '%s'", w32); - cygwin_conv_to_full_posix_path (w32, posix_fn); - return posix_fn; -} |