f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
608 lines
14 KiB
C
608 lines
14 KiB
C
/* Emulation for poll(2)
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Contributed by Paolo Bonzini.
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Copyright 2001-2003, 2006-2011 Free Software Foundation, Inc.
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This file is part of gnulib.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, see <http://www.gnu.org/licenses/>. */
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/* To bump the minimum Windows version to Windows Vista */
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#include "git-compat-util.h"
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/* Tell gcc not to warn about the (nfd < 0) tests, below. */
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#if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__
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# pragma GCC diagnostic ignored "-Wtype-limits"
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#endif
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#if defined(WIN32)
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# include <malloc.h>
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#include <limits.h>
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#include <assert.h>
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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# define WIN32_NATIVE
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# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
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# define _WIN32_WINNT 0x0502
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# endif
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# include <winsock2.h>
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# include <windows.h>
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# include <io.h>
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# include <stdio.h>
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# include <conio.h>
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#else
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# include <sys/time.h>
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# include <sys/socket.h>
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# ifndef NO_SYS_SELECT_H
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# include <sys/select.h>
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# endif
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# include <unistd.h>
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#endif
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/* Specification. */
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#include "poll.h"
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#ifdef HAVE_SYS_FILIO_H
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# include <sys/filio.h>
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#endif
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#include <time.h>
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#ifndef INFTIM
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# define INFTIM (-1)
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#endif
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/* BeOS does not have MSG_PEEK. */
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#ifndef MSG_PEEK
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# define MSG_PEEK 0
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#endif
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#ifdef WIN32_NATIVE
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#define IsConsoleHandle(h) (((long) (intptr_t) (h) & 3) == 3)
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static BOOL
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IsSocketHandle (HANDLE h)
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{
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WSANETWORKEVENTS ev;
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if (IsConsoleHandle (h))
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return FALSE;
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/* Under Wine, it seems that getsockopt returns 0 for pipes too.
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WSAEnumNetworkEvents instead distinguishes the two correctly. */
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ev.lNetworkEvents = 0xDEADBEEF;
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WSAEnumNetworkEvents ((SOCKET) h, NULL, &ev);
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return ev.lNetworkEvents != 0xDEADBEEF;
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}
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/* Declare data structures for ntdll functions. */
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typedef struct _FILE_PIPE_LOCAL_INFORMATION {
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ULONG NamedPipeType;
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ULONG NamedPipeConfiguration;
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ULONG MaximumInstances;
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ULONG CurrentInstances;
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ULONG InboundQuota;
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ULONG ReadDataAvailable;
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ULONG OutboundQuota;
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ULONG WriteQuotaAvailable;
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ULONG NamedPipeState;
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ULONG NamedPipeEnd;
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} FILE_PIPE_LOCAL_INFORMATION, *PFILE_PIPE_LOCAL_INFORMATION;
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typedef struct _IO_STATUS_BLOCK
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{
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union {
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DWORD Status;
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PVOID Pointer;
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} u;
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ULONG_PTR Information;
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} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
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typedef enum _FILE_INFORMATION_CLASS {
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FilePipeLocalInformation = 24
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} FILE_INFORMATION_CLASS, *PFILE_INFORMATION_CLASS;
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typedef DWORD (WINAPI *PNtQueryInformationFile)
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(HANDLE, IO_STATUS_BLOCK *, VOID *, ULONG, FILE_INFORMATION_CLASS);
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# ifndef PIPE_BUF
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# define PIPE_BUF 512
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# endif
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/* Compute revents values for file handle H. If some events cannot happen
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for the handle, eliminate them from *P_SOUGHT. */
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static int
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win32_compute_revents (HANDLE h, int *p_sought)
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{
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int i, ret, happened;
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INPUT_RECORD *irbuffer;
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DWORD avail, nbuffer;
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BOOL bRet;
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switch (GetFileType (h))
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{
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case FILE_TYPE_PIPE:
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happened = 0;
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if (PeekNamedPipe (h, NULL, 0, NULL, &avail, NULL) != 0)
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{
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if (avail)
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happened |= *p_sought & (POLLIN | POLLRDNORM);
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}
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else if (GetLastError () == ERROR_BROKEN_PIPE)
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happened |= POLLHUP;
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else
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{
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/* It was the write-end of the pipe. Unfortunately there is no
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reliable way of knowing if it can be written without blocking.
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Just say that it's all good. */
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happened |= *p_sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
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}
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return happened;
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case FILE_TYPE_CHAR:
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ret = WaitForSingleObject (h, 0);
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if (!IsConsoleHandle (h))
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return ret == WAIT_OBJECT_0 ? *p_sought & ~(POLLPRI | POLLRDBAND) : 0;
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nbuffer = avail = 0;
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bRet = GetNumberOfConsoleInputEvents (h, &nbuffer);
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if (bRet)
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{
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/* Input buffer. */
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*p_sought &= POLLIN | POLLRDNORM;
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if (nbuffer == 0)
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return POLLHUP;
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if (!*p_sought)
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return 0;
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irbuffer = (INPUT_RECORD *) alloca (nbuffer * sizeof (INPUT_RECORD));
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bRet = PeekConsoleInput (h, irbuffer, nbuffer, &avail);
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if (!bRet || avail == 0)
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return POLLHUP;
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for (i = 0; i < avail; i++)
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if (irbuffer[i].EventType == KEY_EVENT)
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return *p_sought;
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return 0;
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}
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else
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{
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/* Screen buffer. */
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*p_sought &= POLLOUT | POLLWRNORM | POLLWRBAND;
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return *p_sought;
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}
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default:
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ret = WaitForSingleObject (h, 0);
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if (ret == WAIT_OBJECT_0)
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return *p_sought & ~(POLLPRI | POLLRDBAND);
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return *p_sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
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}
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}
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/* Convert fd_sets returned by select into revents values. */
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static int
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win32_compute_revents_socket (SOCKET h, int sought, long lNetworkEvents)
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{
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int happened = 0;
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if ((lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE)) == FD_ACCEPT)
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happened |= (POLLIN | POLLRDNORM) & sought;
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else if (lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE))
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{
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int r, error;
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char data[64];
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WSASetLastError (0);
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r = recv (h, data, sizeof (data), MSG_PEEK);
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error = WSAGetLastError ();
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WSASetLastError (0);
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if (r > 0 || error == WSAENOTCONN)
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happened |= (POLLIN | POLLRDNORM) & sought;
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/* Distinguish hung-up sockets from other errors. */
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else if (r == 0 || error == WSAESHUTDOWN || error == WSAECONNRESET
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|| error == WSAECONNABORTED || error == WSAENETRESET)
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happened |= POLLHUP;
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else
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happened |= POLLERR;
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}
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if (lNetworkEvents & (FD_WRITE | FD_CONNECT))
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happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought;
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if (lNetworkEvents & FD_OOB)
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happened |= (POLLPRI | POLLRDBAND) & sought;
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return happened;
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}
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#else /* !MinGW */
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/* Convert select(2) returned fd_sets into poll(2) revents values. */
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static int
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compute_revents (int fd, int sought, fd_set *rfds, fd_set *wfds, fd_set *efds)
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{
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int happened = 0;
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if (FD_ISSET (fd, rfds))
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{
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int r;
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int socket_errno;
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# if defined __MACH__ && defined __APPLE__
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/* There is a bug in Mac OS X that causes it to ignore MSG_PEEK
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for some kinds of descriptors. Detect if this descriptor is a
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connected socket, a server socket, or something else using a
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0-byte recv, and use ioctl(2) to detect POLLHUP. */
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r = recv (fd, NULL, 0, MSG_PEEK);
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socket_errno = (r < 0) ? errno : 0;
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if (r == 0 || socket_errno == ENOTSOCK)
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ioctl (fd, FIONREAD, &r);
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# else
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char data[64];
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r = recv (fd, data, sizeof (data), MSG_PEEK);
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socket_errno = (r < 0) ? errno : 0;
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# endif
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if (r == 0)
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happened |= POLLHUP;
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/* If the event happened on an unconnected server socket,
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that's fine. */
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else if (r > 0 || ( /* (r == -1) && */ socket_errno == ENOTCONN))
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happened |= (POLLIN | POLLRDNORM) & sought;
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/* Distinguish hung-up sockets from other errors. */
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else if (socket_errno == ESHUTDOWN || socket_errno == ECONNRESET
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|| socket_errno == ECONNABORTED || socket_errno == ENETRESET)
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happened |= POLLHUP;
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/* some systems can't use recv() on non-socket, including HP NonStop */
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else if (/* (r == -1) && */ socket_errno == ENOTSOCK)
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happened |= (POLLIN | POLLRDNORM) & sought;
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else
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happened |= POLLERR;
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}
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if (FD_ISSET (fd, wfds))
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happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought;
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if (FD_ISSET (fd, efds))
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happened |= (POLLPRI | POLLRDBAND) & sought;
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return happened;
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}
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#endif /* !MinGW */
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int
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poll (struct pollfd *pfd, nfds_t nfd, int timeout)
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{
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#ifndef WIN32_NATIVE
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fd_set rfds, wfds, efds;
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struct timeval tv;
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struct timeval *ptv;
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int maxfd, rc;
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nfds_t i;
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# ifdef _SC_OPEN_MAX
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static int sc_open_max = -1;
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if (nfd < 0
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|| (nfd > sc_open_max
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&& (sc_open_max != -1
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|| nfd > (sc_open_max = sysconf (_SC_OPEN_MAX)))))
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{
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errno = EINVAL;
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return -1;
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}
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# else /* !_SC_OPEN_MAX */
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# ifdef OPEN_MAX
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if (nfd < 0 || nfd > OPEN_MAX)
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{
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errno = EINVAL;
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return -1;
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}
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# endif /* OPEN_MAX -- else, no check is needed */
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# endif /* !_SC_OPEN_MAX */
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/* EFAULT is not necessary to implement, but let's do it in the
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simplest case. */
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if (!pfd && nfd)
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{
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errno = EFAULT;
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return -1;
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}
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/* convert timeout number into a timeval structure */
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if (timeout == 0)
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{
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ptv = &tv;
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ptv->tv_sec = 0;
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ptv->tv_usec = 0;
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}
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else if (timeout > 0)
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{
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ptv = &tv;
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ptv->tv_sec = timeout / 1000;
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ptv->tv_usec = (timeout % 1000) * 1000;
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}
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else if (timeout == INFTIM)
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/* wait forever */
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ptv = NULL;
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else
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{
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errno = EINVAL;
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return -1;
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}
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/* create fd sets and determine max fd */
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maxfd = -1;
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FD_ZERO (&rfds);
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FD_ZERO (&wfds);
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FD_ZERO (&efds);
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for (i = 0; i < nfd; i++)
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{
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if (pfd[i].fd < 0)
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continue;
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if (pfd[i].events & (POLLIN | POLLRDNORM))
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FD_SET (pfd[i].fd, &rfds);
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/* see select(2): "the only exceptional condition detectable
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is out-of-band data received on a socket", hence we push
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POLLWRBAND events onto wfds instead of efds. */
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if (pfd[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND))
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FD_SET (pfd[i].fd, &wfds);
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if (pfd[i].events & (POLLPRI | POLLRDBAND))
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FD_SET (pfd[i].fd, &efds);
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if (pfd[i].fd >= maxfd
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&& (pfd[i].events & (POLLIN | POLLOUT | POLLPRI
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| POLLRDNORM | POLLRDBAND
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| POLLWRNORM | POLLWRBAND)))
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{
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maxfd = pfd[i].fd;
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if (maxfd > FD_SETSIZE)
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{
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errno = EOVERFLOW;
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return -1;
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}
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}
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}
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/* examine fd sets */
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rc = select (maxfd + 1, &rfds, &wfds, &efds, ptv);
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if (rc < 0)
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return rc;
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/* establish results */
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rc = 0;
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for (i = 0; i < nfd; i++)
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if (pfd[i].fd < 0)
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pfd[i].revents = 0;
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else
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{
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int happened = compute_revents (pfd[i].fd, pfd[i].events,
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&rfds, &wfds, &efds);
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if (happened)
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{
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pfd[i].revents = happened;
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rc++;
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}
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else
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{
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pfd[i].revents = 0;
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}
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}
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return rc;
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#else
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static struct timeval tv0;
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static HANDLE hEvent;
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WSANETWORKEVENTS ev;
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HANDLE h, handle_array[FD_SETSIZE + 2];
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DWORD ret, wait_timeout, nhandles, orig_timeout = 0;
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ULONGLONG start = 0;
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fd_set rfds, wfds, xfds;
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BOOL poll_again;
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MSG msg;
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int rc = 0;
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nfds_t i;
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if (nfd < 0 || timeout < -1)
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{
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errno = EINVAL;
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return -1;
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}
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if (timeout != INFTIM)
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{
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orig_timeout = timeout;
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start = GetTickCount64();
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}
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if (!hEvent)
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hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
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restart:
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handle_array[0] = hEvent;
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nhandles = 1;
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FD_ZERO (&rfds);
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FD_ZERO (&wfds);
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FD_ZERO (&xfds);
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/* Classify socket handles and create fd sets. */
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for (i = 0; i < nfd; i++)
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{
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int sought = pfd[i].events;
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pfd[i].revents = 0;
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if (pfd[i].fd < 0)
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continue;
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if (!(sought & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM | POLLWRBAND
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| POLLPRI | POLLRDBAND)))
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continue;
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h = (HANDLE) _get_osfhandle (pfd[i].fd);
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assert (h != NULL);
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if (IsSocketHandle (h))
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{
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int requested = FD_CLOSE;
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/* see above; socket handles are mapped onto select. */
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if (sought & (POLLIN | POLLRDNORM))
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{
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requested |= FD_READ | FD_ACCEPT;
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FD_SET ((SOCKET) h, &rfds);
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}
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if (sought & (POLLOUT | POLLWRNORM | POLLWRBAND))
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{
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requested |= FD_WRITE | FD_CONNECT;
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FD_SET ((SOCKET) h, &wfds);
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}
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if (sought & (POLLPRI | POLLRDBAND))
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{
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requested |= FD_OOB;
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FD_SET ((SOCKET) h, &xfds);
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}
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if (requested)
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WSAEventSelect ((SOCKET) h, hEvent, requested);
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}
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else
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{
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/* Poll now. If we get an event, do not poll again. Also,
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screen buffer handles are waitable, and they'll block until
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a character is available. win32_compute_revents eliminates
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bits for the "wrong" direction. */
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pfd[i].revents = win32_compute_revents (h, &sought);
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if (sought)
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handle_array[nhandles++] = h;
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if (pfd[i].revents)
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timeout = 0;
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}
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}
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if (select (0, &rfds, &wfds, &xfds, &tv0) > 0)
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{
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/* Do MsgWaitForMultipleObjects anyway to dispatch messages, but
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no need to call select again. */
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poll_again = FALSE;
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wait_timeout = 0;
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}
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else
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{
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poll_again = TRUE;
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if (timeout == INFTIM)
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wait_timeout = INFINITE;
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else
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wait_timeout = timeout;
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}
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for (;;)
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{
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ret = MsgWaitForMultipleObjects (nhandles, handle_array, FALSE,
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wait_timeout, QS_ALLINPUT);
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if (ret == WAIT_OBJECT_0 + nhandles)
|
|
{
|
|
/* new input of some other kind */
|
|
BOOL bRet;
|
|
while ((bRet = PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) != 0)
|
|
{
|
|
TranslateMessage (&msg);
|
|
DispatchMessage (&msg);
|
|
}
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (poll_again)
|
|
select (0, &rfds, &wfds, &xfds, &tv0);
|
|
|
|
/* Place a sentinel at the end of the array. */
|
|
handle_array[nhandles] = NULL;
|
|
nhandles = 1;
|
|
for (i = 0; i < nfd; i++)
|
|
{
|
|
int happened;
|
|
|
|
if (pfd[i].fd < 0)
|
|
continue;
|
|
if (!(pfd[i].events & (POLLIN | POLLRDNORM |
|
|
POLLOUT | POLLWRNORM | POLLWRBAND)))
|
|
continue;
|
|
|
|
h = (HANDLE) _get_osfhandle (pfd[i].fd);
|
|
if (h != handle_array[nhandles])
|
|
{
|
|
/* It's a socket. */
|
|
WSAEnumNetworkEvents ((SOCKET) h, NULL, &ev);
|
|
WSAEventSelect ((SOCKET) h, NULL, 0);
|
|
|
|
/* If we're lucky, WSAEnumNetworkEvents already provided a way
|
|
to distinguish FD_READ and FD_ACCEPT; this saves a recv later. */
|
|
if (FD_ISSET ((SOCKET) h, &rfds)
|
|
&& !(ev.lNetworkEvents & (FD_READ | FD_ACCEPT)))
|
|
ev.lNetworkEvents |= FD_READ | FD_ACCEPT;
|
|
if (FD_ISSET ((SOCKET) h, &wfds))
|
|
ev.lNetworkEvents |= FD_WRITE | FD_CONNECT;
|
|
if (FD_ISSET ((SOCKET) h, &xfds))
|
|
ev.lNetworkEvents |= FD_OOB;
|
|
|
|
happened = win32_compute_revents_socket ((SOCKET) h, pfd[i].events,
|
|
ev.lNetworkEvents);
|
|
}
|
|
else
|
|
{
|
|
/* Not a socket. */
|
|
int sought = pfd[i].events;
|
|
happened = win32_compute_revents (h, &sought);
|
|
nhandles++;
|
|
}
|
|
|
|
if ((pfd[i].revents |= happened) != 0)
|
|
rc++;
|
|
}
|
|
|
|
if (!rc && orig_timeout && timeout != INFTIM)
|
|
{
|
|
ULONGLONG elapsed = GetTickCount64() - start;
|
|
timeout = elapsed >= orig_timeout ? 0 : (int)(orig_timeout - elapsed);
|
|
}
|
|
|
|
if (!rc && timeout)
|
|
{
|
|
SleepEx (1, TRUE);
|
|
goto restart;
|
|
}
|
|
|
|
return rc;
|
|
#endif
|
|
}
|