diff options
Diffstat (limited to 'winsup/cygwin/pipe.cc')
| -rw-r--r-- | winsup/cygwin/pipe.cc | 533 |
1 files changed, 0 insertions, 533 deletions
diff --git a/winsup/cygwin/pipe.cc b/winsup/cygwin/pipe.cc deleted file mode 100644 index 0d9c0cd9f..000000000 --- a/winsup/cygwin/pipe.cc +++ /dev/null @@ -1,533 +0,0 @@ -/* pipe.cc: pipe for Cygwin. - - Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, - 2005 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. */ - -/* FIXME: Should this really be fhandler_pipe.cc? */ - -#include "winsup.h" -#include <unistd.h> -#include <stdlib.h> -#include <sys/socket.h> -#include <limits.h> -#include "cygerrno.h" -#include "security.h" -#include "path.h" -#include "fhandler.h" -#include "dtable.h" -#include "cygheap.h" -#include "thread.h" -#include "pinfo.h" -#include "cygthread.h" -#include "ntdll.h" - -static unsigned pipecount; -static const NO_COPY char pipeid_fmt[] = "stupid_pipe.%u.%u"; - -fhandler_pipe::fhandler_pipe () - : fhandler_base (), guard (NULL), broken_pipe (false), writepipe_exists(0), - orig_pid (0), id (0) -{ -} - -extern "C" int sscanf (const char *, const char *, ...); - -int -fhandler_pipe::open (int flags, mode_t mode) -{ - HANDLE proc, pipe_hdl, nio_hdl = NULL, nwrp_hdl = NULL; - fhandler_pipe *fh = NULL; - size_t size; - int pid, rwflags = (flags & O_ACCMODE); - - sscanf (get_name (), "/proc/%d/fd/pipe:[%d]", &pid, (int *) &pipe_hdl); - if (pid == myself->pid) - { - cygheap_fdenum cfd; - while (cfd.next () >= 0) - { - if (cfd->get_handle () != pipe_hdl) - continue; - if ((rwflags == O_RDONLY && !(cfd->get_access () & GENERIC_READ)) - || (rwflags == O_WRONLY && !(cfd->get_access () & GENERIC_WRITE))) - { - set_errno (EACCES); - return 0; - } - if (!cfd->dup (this)) - return 1; - return 0; - } - set_errno (ENOENT); - return 0; - } - - pinfo p (pid); - if (!p) - { - set_errno (ESRCH); - return 0; - } - if (!(proc = OpenProcess (PROCESS_DUP_HANDLE, false, p->dwProcessId))) - { - __seterrno (); - return 0; - } - if (!(fh = p->pipe_fhandler (pipe_hdl, size)) || !size) - { - set_errno (ENOENT); - goto out; - } - /* Too bad, but Windows only allows the same access mode when dup'ing - the pipe. */ - if ((rwflags == O_RDONLY && !(fh->get_access () & GENERIC_READ)) - || (rwflags == O_WRONLY && !(fh->get_access () & GENERIC_WRITE))) - { - set_errno (EACCES); - goto out; - } - if (!DuplicateHandle (proc, pipe_hdl, hMainProc, &nio_hdl, - 0, false, DUPLICATE_SAME_ACCESS)) - { - __seterrno (); - goto out; - } - if (fh->writepipe_exists - && !DuplicateHandle (proc, fh->writepipe_exists, - hMainProc, &nwrp_hdl, - 0, false, DUPLICATE_SAME_ACCESS)) - { - __seterrno (); - goto out; - } - if (fh->read_state) - { - create_read_state (2); - need_fork_fixup (true); - ProtectHandle1 (read_state, read_state); - } - if (fh->get_guard ()) - create_guard ((flags & O_NOINHERIT) ? &sec_none_nih : &sec_none); - init (nio_hdl, fh->get_access (), mode & O_TEXT ?: O_BINARY); - writepipe_exists = nwrp_hdl; - if (flags & O_NOINHERIT) - close_on_exec (true); - uninterruptible_io (fh->uninterruptible_io ()); - free (fh); - CloseHandle (proc); - return 1; -out: - if (nwrp_hdl) - CloseHandle (nwrp_hdl); - if (nio_hdl) - CloseHandle (nio_hdl); - if (fh) - free (fh); - if (proc) - CloseHandle (proc); - return 0; -} - -_off64_t -fhandler_pipe::lseek (_off64_t offset, int whence) -{ - debug_printf ("(%d, %d)", offset, whence); - set_errno (ESPIPE); - return -1; -} - -void -fhandler_pipe::set_close_on_exec (bool val) -{ - fhandler_base::set_close_on_exec (val); - if (guard) - set_no_inheritance (guard, val); - if (writepipe_exists) - set_no_inheritance (writepipe_exists, val); -} - -char *fhandler_pipe::get_proc_fd_name (char *buf) -{ - __small_sprintf (buf, "pipe:[%d]", get_handle ()); - return buf; -} - -struct pipeargs -{ - fhandler_base *fh; - void *ptr; - size_t *len; -}; - -static DWORD WINAPI -read_pipe (void *arg) -{ - pipeargs *pi = (pipeargs *) arg; - pi->fh->fhandler_base::read (pi->ptr, *pi->len); - return 0; -} - -void __stdcall -fhandler_pipe::read (void *in_ptr, size_t& in_len) -{ - if (broken_pipe) - in_len = 0; - else - { - pipeargs pi = {dynamic_cast<fhandler_base *>(this), in_ptr, &in_len}; - cygthread *th = new cygthread (read_pipe, &pi, "read_pipe"); - if (th->detach (read_state) && !in_len) - in_len = (size_t) -1; /* received a signal */ - } - (void) ReleaseMutex (guard); - return; -} - -int -fhandler_pipe::close () -{ - if (guard) - CloseHandle (guard); - if (writepipe_exists) - CloseHandle (writepipe_exists); -#ifndef NEWVFORK - if (read_state) -#else - // FIXME is this vfork_cleanup test right? Is it responsible for some of - // the strange pipe behavior that has been reported in the cygwin mailing - // list? - if (read_state && !cygheap->fdtab.in_vfork_cleanup ()) -#endif - ForceCloseHandle (read_state); - return fhandler_base::close (); -} - -bool -fhandler_pipe::hit_eof () -{ - char buf[80]; - HANDLE ev; - if (broken_pipe) - return 1; - if (!orig_pid) - return false; - __small_sprintf (buf, pipeid_fmt, orig_pid, id); - if ((ev = OpenEvent (EVENT_ALL_ACCESS, FALSE, buf))) - CloseHandle (ev); - debug_printf ("%s %p", buf, ev); - return ev == NULL; -} - -void -fhandler_pipe::fixup_after_exec () -{ - if (read_state) - { - create_read_state (2); - ProtectHandle (read_state); - } -} - -void -fhandler_pipe::fixup_after_fork (HANDLE parent) -{ -debug_printf ("here"); - fhandler_base::fixup_after_fork (parent); - if (guard) - fork_fixup (parent, guard, "guard"); - if (writepipe_exists) - fork_fixup (parent, writepipe_exists, "guard"); - fixup_after_exec (); -} - -int -fhandler_pipe::dup (fhandler_base *child) -{ - int res = -1; - fhandler_pipe *ftp = (fhandler_pipe *) child; - ftp->guard = ftp->writepipe_exists = ftp->read_state = NULL; - - if (get_handle ()) - { - res = fhandler_base::dup (child); - if (res) - goto err; - } - - if (guard == NULL) - ftp->guard = NULL; - else if (!DuplicateHandle (hMainProc, guard, hMainProc, &ftp->guard, 0, 1, - DUPLICATE_SAME_ACCESS)) - { - debug_printf ("couldn't duplicate guard %p, %E", guard); - goto err; - } - - if (writepipe_exists == NULL) - ftp->writepipe_exists = NULL; - else if (!DuplicateHandle (hMainProc, writepipe_exists, hMainProc, - &ftp->writepipe_exists, 0, 1, - DUPLICATE_SAME_ACCESS)) - { - debug_printf ("couldn't duplicate writepipe_exists %p, %E", writepipe_exists); - goto err; - } - - if (read_state == NULL) - ftp->read_state = NULL; - else if (!DuplicateHandle (hMainProc, read_state, hMainProc, - &ftp->read_state, 0, 0, - DUPLICATE_SAME_ACCESS)) - { - debug_printf ("couldn't duplicate read_state %p, %E", read_state); - goto err; - } - - res = 0; - goto out; - -err: - if (ftp->guard) - CloseHandle (ftp->guard); - if (ftp->writepipe_exists) - CloseHandle (ftp->writepipe_exists); - if (ftp->read_state) - CloseHandle (ftp->read_state); - goto leave; - -out: - ftp->id = id; - ftp->orig_pid = orig_pid; - VerifyHandle (ftp->guard); - VerifyHandle (ftp->writepipe_exists); - VerifyHandle (ftp->read_state); - -leave: - debug_printf ("res %d", res); - return res; -} - -/* Create a pipe, and return handles to the read and write ends, - just like CreatePipe, but ensure that the write end permits - FILE_READ_ATTRIBUTES access, on later versions of win32 where - this is supported. This access is needed by NtQueryInformationFile, - which is used to implement select and nonblocking writes. - Note that the return value is either 0 or GetLastError, - unlike CreatePipe, which returns a bool for success or failure. */ -int -fhandler_pipe::create_selectable (LPSECURITY_ATTRIBUTES sa_ptr, HANDLE& r, - HANDLE& w, DWORD psize, bool fifo) -{ - /* Default to error. */ - r = w = INVALID_HANDLE_VALUE; - - /* Ensure that there is enough pipe buffer space for atomic writes. */ - if (!fifo && psize < PIPE_BUF) - psize = PIPE_BUF; - - char pipename[CYG_MAX_PATH]; - - /* Retry CreateNamedPipe as long as the pipe name is in use. - Retrying will probably never be necessary, but we want - to be as robust as possible. */ - while (1) - { - static volatile ULONG pipe_unique_id; - - __small_sprintf (pipename, "\\\\.\\pipe\\cygwin-%p-%p", myself->pid, - InterlockedIncrement ((LONG *) &pipe_unique_id)); - - debug_printf ("CreateNamedPipe: name %s, size %lu", pipename, psize); - - /* Use CreateNamedPipe instead of CreatePipe, because the latter - returns a write handle that does not permit FILE_READ_ATTRIBUTES - access, on versions of win32 earlier than WinXP SP2. - CreatePipe also stupidly creates a full duplex pipe, which is - a waste, since only a single direction is actually used. - It's important to only allow a single instance, to ensure that - the pipe was not created earlier by some other process, even if - the pid has been reused. We avoid FILE_FLAG_FIRST_PIPE_INSTANCE - because that is only available for Win2k SP2 and WinXP. */ - r = CreateNamedPipe (pipename, PIPE_ACCESS_INBOUND, - PIPE_TYPE_BYTE | PIPE_READMODE_BYTE, 1, psize, - psize, NMPWAIT_USE_DEFAULT_WAIT, sa_ptr); - - /* Win 95 seems to return NULL instead of INVALID_HANDLE_VALUE */ - if (r && r != INVALID_HANDLE_VALUE) - { - debug_printf ("pipe read handle %p", r); - break; - } - - DWORD err = GetLastError (); - switch (err) - { - case ERROR_PIPE_BUSY: - /* The pipe is already open with compatible parameters. - Pick a new name and retry. */ - debug_printf ("pipe busy, retrying"); - break; - case ERROR_ACCESS_DENIED: - /* The pipe is already open with incompatible parameters. - Pick a new name and retry. */ - debug_printf ("pipe access denied, retrying"); - break; - default: - /* CreateNamePipe failed. Maybe we are on an older Win9x platform without - named pipes. Return an anonymous pipe as the best approximation. */ - debug_printf ("CreateNamedPipe failed, resorting to CreatePipe size %lu", - psize); - if (CreatePipe (&r, &w, sa_ptr, psize)) - { - debug_printf ("pipe read handle %p", r); - debug_printf ("pipe write handle %p", w); - return 0; - } - err = GetLastError (); - debug_printf ("CreatePipe failed, %E"); - return err; - } - } - - debug_printf ("CreateFile: name %s", pipename); - - /* Open the named pipe for writing. - Be sure to permit FILE_READ_ATTRIBUTES access. */ - w = CreateFile (pipename, GENERIC_WRITE | FILE_READ_ATTRIBUTES, 0, sa_ptr, - OPEN_EXISTING, 0, 0); - - if (!w || w == INVALID_HANDLE_VALUE) - { - /* Failure. */ - DWORD err = GetLastError (); - debug_printf ("CreateFile failed, %E"); - CloseHandle (r); - return err; - } - - debug_printf ("pipe write handle %p", w); - - /* Success. */ - return 0; -} - -int -fhandler_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode, bool fifo) -{ - HANDLE r, w; - SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none; - int res = -1; - - int ret = create_selectable (sa, r, w, psize, fifo); - if (ret) - __seterrno_from_win_error (ret); - else - { - fhs[0] = (fhandler_pipe *) build_fh_dev (*piper_dev); - fhs[1] = (fhandler_pipe *) build_fh_dev (*pipew_dev); - - int binmode = mode & O_TEXT ?: O_BINARY; - fhs[0]->init (r, GENERIC_READ, binmode); - fhs[1]->init (w, GENERIC_WRITE, binmode); - if (mode & O_NOINHERIT) - { - fhs[0]->close_on_exec (true); - fhs[1]->close_on_exec (true); - } - - fhs[0]->create_read_state (2); - fhs[0]->need_fork_fixup (true); - ProtectHandle1 (fhs[0]->read_state, read_state); - - res = 0; - fhs[0]->create_guard (sa); - if (wincap.has_unreliable_pipes ()) - { - char buf[80]; - int count = pipecount++; /* FIXME: Should this be InterlockedIncrement? */ - __small_sprintf (buf, pipeid_fmt, myself->pid, count); - fhs[1]->writepipe_exists = CreateEvent (sa, TRUE, FALSE, buf); - fhs[0]->orig_pid = myself->pid; - fhs[0]->id = count; - } - } - - syscall_printf ("%d = pipe ([%p, %p], %d, %p)", res, fhs[0], fhs[1], psize, mode); - return res; -} - -int -fhandler_pipe::ioctl (unsigned int cmd, void *p) -{ - int n; - - switch (cmd) - { - case FIONREAD: - if (get_device () == FH_PIPEW) - { - set_errno (EINVAL); - return -1; - } - if (!PeekNamedPipe (get_handle (), NULL, 0, NULL, (DWORD *) &n, NULL)) - { - __seterrno (); - return -1; - } - break; - default: - return fhandler_base::ioctl (cmd, p); - break; - } - *(int *) p = n; - return 0; -} - -#define DEFAULT_PIPEBUFSIZE (4 * PIPE_BUF) - -extern "C" int -pipe (int filedes[2]) -{ - extern DWORD binmode; - fhandler_pipe *fhs[2]; - int res = fhandler_pipe::create (fhs, DEFAULT_PIPEBUFSIZE, - (!binmode || binmode == O_BINARY) - ? O_BINARY : O_TEXT); - if (res == 0) - { - cygheap_fdnew fdin; - cygheap_fdnew fdout (fdin, false); - fdin = fhs[0]; - fdout = fhs[1]; - filedes[0] = fdin; - filedes[1] = fdout; - } - - return res; -} - -extern "C" int -_pipe (int filedes[2], unsigned int psize, int mode) -{ - fhandler_pipe *fhs[2]; - int res = fhandler_pipe::create (fhs, psize, mode); - /* This type of pipe is not interruptible so set the appropriate flag. */ - if (!res) - { - cygheap_fdnew fdin; - cygheap_fdnew fdout (fdin, false); - fhs[0]->uninterruptible_io (true); - fdin = fhs[0]; - fdout = fhs[1]; - filedes[0] = fdin; - filedes[1] = fdout; - } - - return res; -} |