diff options
Diffstat (limited to 'third_party/git/compat/poll/poll.c')
| -rw-r--r-- | third_party/git/compat/poll/poll.c | 633 |
1 files changed, 0 insertions, 633 deletions
diff --git a/third_party/git/compat/poll/poll.c b/third_party/git/compat/poll/poll.c deleted file mode 100644 index 0e95dd493c..0000000000 --- a/third_party/git/compat/poll/poll.c +++ /dev/null @@ -1,633 +0,0 @@ -/* Emulation for poll(2) - Contributed by Paolo Bonzini. - - Copyright 2001-2003, 2006-2011 Free Software Foundation, Inc. - - This file is part of gnulib. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License along - with this program; if not, see <http://www.gnu.org/licenses/>. */ - -/* To bump the minimum Windows version to Windows Vista */ -#include "git-compat-util.h" - -/* Tell gcc not to warn about the (nfd < 0) tests, below. */ -#if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__ -# pragma GCC diagnostic ignored "-Wtype-limits" -#endif - -#if defined(WIN32) -# include <malloc.h> -#endif - -#include <sys/types.h> - -#include <errno.h> -#include <limits.h> -#include <assert.h> - -#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ -# define WIN32_NATIVE -# if defined (_MSC_VER) && !defined(_WIN32_WINNT) -# define _WIN32_WINNT 0x0502 -# endif -# include <winsock2.h> -# include <windows.h> -# include <io.h> -# include <stdio.h> -# include <conio.h> -#else -# include <sys/time.h> -# include <sys/socket.h> -# ifndef NO_SYS_SELECT_H -# include <sys/select.h> -# endif -# include <unistd.h> -#endif - -/* Specification. */ -#include "poll.h" - -#ifdef HAVE_SYS_IOCTL_H -# include <sys/ioctl.h> -#endif -#ifdef HAVE_SYS_FILIO_H -# include <sys/filio.h> -#endif - -#include <time.h> - -#ifndef INFTIM -# define INFTIM (-1) -#endif - -/* BeOS does not have MSG_PEEK. */ -#ifndef MSG_PEEK -# define MSG_PEEK 0 -#endif - -#ifdef WIN32_NATIVE - -#define IsConsoleHandle(h) (((long) (intptr_t) (h) & 3) == 3) - -static BOOL -IsSocketHandle (HANDLE h) -{ - WSANETWORKEVENTS ev; - - if (IsConsoleHandle (h)) - return FALSE; - - /* Under Wine, it seems that getsockopt returns 0 for pipes too. - WSAEnumNetworkEvents instead distinguishes the two correctly. */ - ev.lNetworkEvents = 0xDEADBEEF; - WSAEnumNetworkEvents ((SOCKET) h, NULL, &ev); - return ev.lNetworkEvents != 0xDEADBEEF; -} - -/* Declare data structures for ntdll functions. */ -typedef struct _FILE_PIPE_LOCAL_INFORMATION { - ULONG NamedPipeType; - ULONG NamedPipeConfiguration; - ULONG MaximumInstances; - ULONG CurrentInstances; - ULONG InboundQuota; - ULONG ReadDataAvailable; - ULONG OutboundQuota; - ULONG WriteQuotaAvailable; - ULONG NamedPipeState; - ULONG NamedPipeEnd; -} FILE_PIPE_LOCAL_INFORMATION, *PFILE_PIPE_LOCAL_INFORMATION; - -typedef struct _IO_STATUS_BLOCK -{ - union { - DWORD Status; - PVOID Pointer; - } u; - ULONG_PTR Information; -} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK; - -typedef enum _FILE_INFORMATION_CLASS { - FilePipeLocalInformation = 24 -} FILE_INFORMATION_CLASS, *PFILE_INFORMATION_CLASS; - -typedef DWORD (WINAPI *PNtQueryInformationFile) - (HANDLE, IO_STATUS_BLOCK *, VOID *, ULONG, FILE_INFORMATION_CLASS); - -# ifndef PIPE_BUF -# define PIPE_BUF 512 -# endif - -/* Compute revents values for file handle H. If some events cannot happen - for the handle, eliminate them from *P_SOUGHT. */ - -static int -win32_compute_revents (HANDLE h, int *p_sought) -{ - int i, ret, happened; - INPUT_RECORD *irbuffer; - DWORD avail, nbuffer; - BOOL bRet; - IO_STATUS_BLOCK iosb; - FILE_PIPE_LOCAL_INFORMATION fpli; - static PNtQueryInformationFile NtQueryInformationFile; - static BOOL once_only; - - switch (GetFileType (h)) - { - case FILE_TYPE_PIPE: - if (!once_only) - { - NtQueryInformationFile = (PNtQueryInformationFile)(void (*)(void)) - GetProcAddress (GetModuleHandleW (L"ntdll.dll"), - "NtQueryInformationFile"); - once_only = TRUE; - } - - happened = 0; - if (PeekNamedPipe (h, NULL, 0, NULL, &avail, NULL) != 0) - { - if (avail) - happened |= *p_sought & (POLLIN | POLLRDNORM); - } - else if (GetLastError () == ERROR_BROKEN_PIPE) - happened |= POLLHUP; - - else - { - /* It was the write-end of the pipe. Check if it is writable. - If NtQueryInformationFile fails, optimistically assume the pipe is - writable. This could happen on Win9x, where NtQueryInformationFile - is not available, or if we inherit a pipe that doesn't permit - FILE_READ_ATTRIBUTES access on the write end (I think this should - not happen since WinXP SP2; WINE seems fine too). Otherwise, - ensure that enough space is available for atomic writes. */ - memset (&iosb, 0, sizeof (iosb)); - memset (&fpli, 0, sizeof (fpli)); - - if (!NtQueryInformationFile - || NtQueryInformationFile (h, &iosb, &fpli, sizeof (fpli), - FilePipeLocalInformation) - || fpli.WriteQuotaAvailable >= PIPE_BUF - || (fpli.OutboundQuota < PIPE_BUF && - fpli.WriteQuotaAvailable == fpli.OutboundQuota)) - happened |= *p_sought & (POLLOUT | POLLWRNORM | POLLWRBAND); - } - return happened; - - case FILE_TYPE_CHAR: - ret = WaitForSingleObject (h, 0); - if (!IsConsoleHandle (h)) - return ret == WAIT_OBJECT_0 ? *p_sought & ~(POLLPRI | POLLRDBAND) : 0; - - nbuffer = avail = 0; - bRet = GetNumberOfConsoleInputEvents (h, &nbuffer); - if (bRet) - { - /* Input buffer. */ - *p_sought &= POLLIN | POLLRDNORM; - if (nbuffer == 0) - return POLLHUP; - if (!*p_sought) - return 0; - - irbuffer = (INPUT_RECORD *) alloca (nbuffer * sizeof (INPUT_RECORD)); - bRet = PeekConsoleInput (h, irbuffer, nbuffer, &avail); - if (!bRet || avail == 0) - return POLLHUP; - - for (i = 0; i < avail; i++) - if (irbuffer[i].EventType == KEY_EVENT) - return *p_sought; - return 0; - } - else - { - /* Screen buffer. */ - *p_sought &= POLLOUT | POLLWRNORM | POLLWRBAND; - return *p_sought; - } - - default: - ret = WaitForSingleObject (h, 0); - if (ret == WAIT_OBJECT_0) - return *p_sought & ~(POLLPRI | POLLRDBAND); - - return *p_sought & (POLLOUT | POLLWRNORM | POLLWRBAND); - } -} - -/* Convert fd_sets returned by select into revents values. */ - -static int -win32_compute_revents_socket (SOCKET h, int sought, long lNetworkEvents) -{ - int happened = 0; - - if ((lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE)) == FD_ACCEPT) - happened |= (POLLIN | POLLRDNORM) & sought; - - else if (lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE)) - { - int r, error; - - char data[64]; - WSASetLastError (0); - r = recv (h, data, sizeof (data), MSG_PEEK); - error = WSAGetLastError (); - WSASetLastError (0); - - if (r > 0 || error == WSAENOTCONN) - happened |= (POLLIN | POLLRDNORM) & sought; - - /* Distinguish hung-up sockets from other errors. */ - else if (r == 0 || error == WSAESHUTDOWN || error == WSAECONNRESET - || error == WSAECONNABORTED || error == WSAENETRESET) - happened |= POLLHUP; - - else - happened |= POLLERR; - } - - if (lNetworkEvents & (FD_WRITE | FD_CONNECT)) - happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought; - - if (lNetworkEvents & FD_OOB) - happened |= (POLLPRI | POLLRDBAND) & sought; - - return happened; -} - -#else /* !MinGW */ - -/* Convert select(2) returned fd_sets into poll(2) revents values. */ -static int -compute_revents (int fd, int sought, fd_set *rfds, fd_set *wfds, fd_set *efds) -{ - int happened = 0; - if (FD_ISSET (fd, rfds)) - { - int r; - int socket_errno; - -# if defined __MACH__ && defined __APPLE__ - /* There is a bug in Mac OS X that causes it to ignore MSG_PEEK - for some kinds of descriptors. Detect if this descriptor is a - connected socket, a server socket, or something else using a - 0-byte recv, and use ioctl(2) to detect POLLHUP. */ - r = recv (fd, NULL, 0, MSG_PEEK); - socket_errno = (r < 0) ? errno : 0; - if (r == 0 || socket_errno == ENOTSOCK) - ioctl (fd, FIONREAD, &r); -# else - char data[64]; - r = recv (fd, data, sizeof (data), MSG_PEEK); - socket_errno = (r < 0) ? errno : 0; -# endif - if (r == 0) - happened |= POLLHUP; - - /* If the event happened on an unconnected server socket, - that's fine. */ - else if (r > 0 || ( /* (r == -1) && */ socket_errno == ENOTCONN)) - happened |= (POLLIN | POLLRDNORM) & sought; - - /* Distinguish hung-up sockets from other errors. */ - else if (socket_errno == ESHUTDOWN || socket_errno == ECONNRESET - || socket_errno == ECONNABORTED || socket_errno == ENETRESET) - happened |= POLLHUP; - - /* some systems can't use recv() on non-socket, including HP NonStop */ - else if (/* (r == -1) && */ socket_errno == ENOTSOCK) - happened |= (POLLIN | POLLRDNORM) & sought; - - else - happened |= POLLERR; - } - - if (FD_ISSET (fd, wfds)) - happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought; - - if (FD_ISSET (fd, efds)) - happened |= (POLLPRI | POLLRDBAND) & sought; - - return happened; -} -#endif /* !MinGW */ - -int -poll (struct pollfd *pfd, nfds_t nfd, int timeout) -{ -#ifndef WIN32_NATIVE - fd_set rfds, wfds, efds; - struct timeval tv; - struct timeval *ptv; - int maxfd, rc; - nfds_t i; - -# ifdef _SC_OPEN_MAX - static int sc_open_max = -1; - - if (nfd < 0 - || (nfd > sc_open_max - && (sc_open_max != -1 - || nfd > (sc_open_max = sysconf (_SC_OPEN_MAX))))) - { - errno = EINVAL; - return -1; - } -# else /* !_SC_OPEN_MAX */ -# ifdef OPEN_MAX - if (nfd < 0 || nfd > OPEN_MAX) - { - errno = EINVAL; - return -1; - } -# endif /* OPEN_MAX -- else, no check is needed */ -# endif /* !_SC_OPEN_MAX */ - - /* EFAULT is not necessary to implement, but let's do it in the - simplest case. */ - if (!pfd && nfd) - { - errno = EFAULT; - return -1; - } - - /* convert timeout number into a timeval structure */ - if (timeout == 0) - { - ptv = &tv; - ptv->tv_sec = 0; - ptv->tv_usec = 0; - } - else if (timeout > 0) - { - ptv = &tv; - ptv->tv_sec = timeout / 1000; - ptv->tv_usec = (timeout % 1000) * 1000; - } - else if (timeout == INFTIM) - /* wait forever */ - ptv = NULL; - else - { - errno = EINVAL; - return -1; - } - - /* create fd sets and determine max fd */ - maxfd = -1; - FD_ZERO (&rfds); - FD_ZERO (&wfds); - FD_ZERO (&efds); - for (i = 0; i < nfd; i++) - { - if (pfd[i].fd < 0) - continue; - - if (pfd[i].events & (POLLIN | POLLRDNORM)) - FD_SET (pfd[i].fd, &rfds); - - /* see select(2): "the only exceptional condition detectable - is out-of-band data received on a socket", hence we push - POLLWRBAND events onto wfds instead of efds. */ - if (pfd[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND)) - FD_SET (pfd[i].fd, &wfds); - if (pfd[i].events & (POLLPRI | POLLRDBAND)) - FD_SET (pfd[i].fd, &efds); - if (pfd[i].fd >= maxfd - && (pfd[i].events & (POLLIN | POLLOUT | POLLPRI - | POLLRDNORM | POLLRDBAND - | POLLWRNORM | POLLWRBAND))) - { - maxfd = pfd[i].fd; - if (maxfd > FD_SETSIZE) - { - errno = EOVERFLOW; - return -1; - } - } - } - - /* examine fd sets */ - rc = select (maxfd + 1, &rfds, &wfds, &efds, ptv); - if (rc < 0) - return rc; - - /* establish results */ - rc = 0; - for (i = 0; i < nfd; i++) - if (pfd[i].fd < 0) - pfd[i].revents = 0; - else - { - int happened = compute_revents (pfd[i].fd, pfd[i].events, - &rfds, &wfds, &efds); - if (happened) - { - pfd[i].revents = happened; - rc++; - } - else - { - pfd[i].revents = 0; - } - } - - return rc; -#else - static struct timeval tv0; - static HANDLE hEvent; - WSANETWORKEVENTS ev; - HANDLE h, handle_array[FD_SETSIZE + 2]; - DWORD ret, wait_timeout, nhandles, orig_timeout = 0; - ULONGLONG start = 0; - fd_set rfds, wfds, xfds; - BOOL poll_again; - MSG msg; - int rc = 0; - nfds_t i; - - if (nfd < 0 || timeout < -1) - { - errno = EINVAL; - return -1; - } - - if (timeout != INFTIM) - { - orig_timeout = timeout; - start = GetTickCount64(); - } - - if (!hEvent) - hEvent = CreateEvent (NULL, FALSE, FALSE, NULL); - -restart: - handle_array[0] = hEvent; - nhandles = 1; - FD_ZERO (&rfds); - FD_ZERO (&wfds); - FD_ZERO (&xfds); - - /* Classify socket handles and create fd sets. */ - for (i = 0; i < nfd; i++) - { - int sought = pfd[i].events; - pfd[i].revents = 0; - if (pfd[i].fd < 0) - continue; - if (!(sought & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM | POLLWRBAND - | POLLPRI | POLLRDBAND))) - continue; - - h = (HANDLE) _get_osfhandle (pfd[i].fd); - assert (h != NULL); - if (IsSocketHandle (h)) - { - int requested = FD_CLOSE; - - /* see above; socket handles are mapped onto select. */ - if (sought & (POLLIN | POLLRDNORM)) - { - requested |= FD_READ | FD_ACCEPT; - FD_SET ((SOCKET) h, &rfds); - } - if (sought & (POLLOUT | POLLWRNORM | POLLWRBAND)) - { - requested |= FD_WRITE | FD_CONNECT; - FD_SET ((SOCKET) h, &wfds); - } - if (sought & (POLLPRI | POLLRDBAND)) - { - requested |= FD_OOB; - FD_SET ((SOCKET) h, &xfds); - } - - if (requested) - WSAEventSelect ((SOCKET) h, hEvent, requested); - } - else - { - /* Poll now. If we get an event, do not poll again. Also, - screen buffer handles are waitable, and they'll block until - a character is available. win32_compute_revents eliminates - bits for the "wrong" direction. */ - pfd[i].revents = win32_compute_revents (h, &sought); - if (sought) - handle_array[nhandles++] = h; - if (pfd[i].revents) - timeout = 0; - } - } - - if (select (0, &rfds, &wfds, &xfds, &tv0) > 0) - { - /* Do MsgWaitForMultipleObjects anyway to dispatch messages, but - no need to call select again. */ - poll_again = FALSE; - wait_timeout = 0; - } - else - { - poll_again = TRUE; - if (timeout == INFTIM) - wait_timeout = INFINITE; - else - wait_timeout = timeout; - } - - for (;;) - { - ret = MsgWaitForMultipleObjects (nhandles, handle_array, FALSE, - wait_timeout, QS_ALLINPUT); - - 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 -} |