* fhandler.h (fhandler_base_setup_overlapped): Add new argument.
(fhandler_base::get_overlapped_buffer): Declare new function. (fhandler_base::set_overlapped): Ditto. (fhandler_pipe::overlapped): New variable. (fhandler_pipe::get_overlapped): Rework to return contents of overlapped variable. (fhandler_pipe::set_overlapped): Set overlapped variable based on argument. (fhandler_fifo::get_overlapped_buffer): Return pointer to io_status. * fhandler.cc (handler_base::setup_overlapped): Set to overlapped pointer to NULL if new doit parameter is false. Otherwise set up overlapped event as usual. (fhandler_base::wait_overlapped): Return inres if this isn't an overlapped operation. (fhandler_base::read_overlapped): Remove inappropriate asserts. * pipe.cc (fhandler_pipe::fhandler_pipe): Zero overlapped element. (struct pipesync): Delete. (getov_result): Ditto. (pipe_handler): Ditto. (pipesync::pipesync): Ditto. (fhandler_pipe::init): Don't set up pipesync thread. Just pass opened_properly flag along to overlapped setup.
This commit is contained in:
Christopher Faylor
@@ -23,136 +23,11 @@ details. */
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#include "pinfo.h"
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fhandler_pipe::fhandler_pipe ()
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: fhandler_base (), popen_pid (0)
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: fhandler_base (), popen_pid (0), overlapped (NULL)
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{
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get_overlapped ()->hEvent = NULL;
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need_fork_fixup (true);
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}
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struct pipesync
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{
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bool reader;
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HANDLE ev, non_cygwin_h, ret_handle;
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pipesync(HANDLE, DWORD);
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int operator == (int x) const {return !!ev;}
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static DWORD WINAPI handler (LPVOID *);
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};
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inline bool
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getov_result (BOOL res, bool reading, HANDLE h, DWORD& nbytes, LPOVERLAPPED ov)
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{
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DWORD err = GetLastError ();
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if (res || (reading && ov && err == ERROR_HANDLE_EOF))
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/* not an error */;
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else if (!ov || (err != ERROR_IO_PENDING)
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|| (!GetOverlappedResult (h, ov, &nbytes, true)
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&& (!reading || (GetLastError () != ERROR_HANDLE_EOF))))
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{
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__seterrno ();
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return false;
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}
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return true;
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}
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static DWORD WINAPI
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pipe_handler (LPVOID in_ps)
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{
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pipesync ps = *(pipesync *) in_ps;
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HANDLE h, in, out;
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DWORD err = fhandler_pipe::create_selectable (&sec_none_nih, in, out, 0);
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if (err)
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{
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SetLastError (err);
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system_printf ("couldn't create a shadow pipe for non-cygwin pipe I/O, %E");
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return 0;
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}
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h = ((pipesync *) in_ps)->ret_handle = ps.reader ? in : out;
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SetHandleInformation (h, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT);
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SetEvent (ps.ev);
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DWORD read_bytes, write_bytes;
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HANDLE hread, hwrite, hclose;
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OVERLAPPED ov, *rov, *wov;
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memset (&ov, 0, sizeof (ov));
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ov.hEvent = CreateEvent (&sec_none_nih, true, false, NULL);
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if (ps.reader)
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{
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hread = ps.non_cygwin_h;
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hclose = hwrite = out;
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wov = &ov;
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rov = NULL;
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}
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else
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{
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hclose = hread = in;
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hwrite = ps.non_cygwin_h;
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rov = &ov;
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wov = NULL;
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}
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char buf[4096];
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while (1)
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{
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ResetEvent (ov.hEvent);
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BOOL res = ReadFile (hread, buf, 4096, &read_bytes, rov);
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if (!getov_result (res, true, hread, read_bytes, rov))
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break;
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if (!read_bytes)
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break;
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res = WriteFile (hwrite, buf, read_bytes, &write_bytes, wov);
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if (!getov_result (res, false, hwrite, write_bytes, wov))
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break;
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if (write_bytes != read_bytes)
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break;
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}
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err = GetLastError ();
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CloseHandle (ov.hEvent);
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CloseHandle (hclose);
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CloseHandle (ps.non_cygwin_h);
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SetLastError (err);
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return 0;
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}
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pipesync::pipesync (HANDLE f, DWORD is_reader):
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reader (false), ret_handle (NULL)
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{
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ev = CreateEvent (&sec_none_nih, true, false, NULL);
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if (!ev)
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system_printf ("couldn't create synchronization event for non-cygwin pipe, %E");
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else
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{
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debug_printf ("created thread synchronization event %p", ev);
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non_cygwin_h = f;
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reader = !!is_reader;
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ret_handle = NULL;
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DWORD tid;
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HANDLE ht = CreateThread (&sec_none_nih, 0, pipe_handler, this, 0, &tid);
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if (!ht)
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goto out;
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CloseHandle (ht);
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switch (WaitForSingleObject (ev, INFINITE))
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{
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case WAIT_OBJECT_0:
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break;
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default:
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system_printf ("WFSO failed waiting for synchronization event for non-cygwin pipe, %E");
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break;
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}
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}
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out:
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if (ev)
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{
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CloseHandle (ev);
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ev = NULL;
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}
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}
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void
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fhandler_pipe::init (HANDLE f, DWORD a, mode_t mode)
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{
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@@ -173,16 +48,10 @@ fhandler_pipe::init (HANDLE f, DWORD a, mode_t mode)
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bool opened_properly = a & FILE_CREATE_PIPE_INSTANCE;
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a &= ~FILE_CREATE_PIPE_INSTANCE;
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if (!opened_properly)
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{
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pipesync ps (f, a & GENERIC_READ);
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f = ps.ret_handle;
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}
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fhandler_base::init (f, a, mode);
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if (mode & O_NOINHERIT)
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close_on_exec (true);
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setup_overlapped ();
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setup_overlapped (opened_properly);
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}
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extern "C" int sscanf (const char *, const char *, ...);
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