[Libguestfs] [PATCH nbdkit 07/13] common/replacements: Add replacement pread and pwrite functions for Windows.

--- configure.ac | 2 + common/replacements/Makefile.am | 4 ++ common/replacements/pread.h | 44 ++++++++++++++++++ common/replacements/pwrite.h | 44 ++++++++++++++++++ common/replacements/pread.c | 79 +++++++++++++++++++++++++++++++++ common/replacements/pwrite.c | 77 ++++++++++++++++++++++++++++++++ 6 files changed, 250 insertions(+) diff --git a/configure.ac b/configure.ac index c21855d8..dd536258 100644 --- a/configure.ac +++ b/configure.ac @@ -346,6 +346,8 @@ AC_REPLACE_FUNCS([\ getline \ openlog \ poll \ + pread \ + pwrite \ realpath \ strndup \ syslog \ diff --git a/common/replacements/Makefile.am b/common/replacements/Makefile.am index bd884e0a..cd62fbfc 100644 --- a/common/replacements/Makefile.am +++ b/common/replacements/Makefile.am @@ -51,6 +51,10 @@ EXTRA_DIST = \ openlog.c \ poll.c \ poll.h \ + pread.c \ + pread.h \ + pwrite.c \ + pwrite.h \ realpath.c \ realpath.h \ strndup.c \ diff --git a/common/replacements/pread.h b/common/replacements/pread.h new file mode 100644 index 00000000..cf90c330 --- /dev/null +++ b/common/replacements/pread.h @@ -0,0 +1,44 @@ +/* nbdkit + * Copyright (C) 2019-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef NBDKIT_PREAD_H +#define NBDKIT_PREAD_H + +#include <config.h> + +#include <unistd.h> + +#ifndef HAVE_PREAD +extern ssize_t pread (int fd, void *buf, size_t count, off_t offset); +#endif + +#endif /* NBDKIT_PREAD_H */ diff --git a/common/replacements/pwrite.h b/common/replacements/pwrite.h new file mode 100644 index 00000000..bf02c7df --- /dev/null +++ b/common/replacements/pwrite.h @@ -0,0 +1,44 @@ +/* nbdkit + * Copyright (C) 2019-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef NBDKIT_PWRITE_H +#define NBDKIT_PWRITE_H + +#include <config.h> + +#include <unistd.h> + +#ifndef HAVE_PWRITE +extern ssize_t pwrite (int fd, const void *buf, size_t count, off_t offset); +#endif + +#endif /* NBDKIT_PWRITE_H */ diff --git a/common/replacements/pread.c b/common/replacements/pread.c new file mode 100644 index 00000000..065503ed --- /dev/null +++ b/common/replacements/pread.c @@ -0,0 +1,79 @@ +/* nbdkit + * Copyright (C) 2019-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* Replacement for pread for platforms which lack this function. */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <assert.h> +#include <errno.h> + +#ifndef HAVE_PREAD + +#include "pread.h" + +#ifdef WIN32 + +/* Replacement pread for Win32. */ + +#include <windows.h> + +ssize_t +pread (int fd, void *buf, size_t count, off_t offset) +{ + DWORD r; + OVERLAPPED ovl; + + memset (&ovl, 0, sizeof ovl); + /* Seriously WTF Windows? */ + ovl.Offset = offset & 0xffffffff; + ovl.OffsetHigh = offset >> 32; + + /* XXX Will fail weirdly if count is larger than 32 bits. */ + if (!ReadFile (_get_osfhandle (fd), buf, count, &r, &ovl)) { + if (GetLastError () == ERROR_HANDLE_EOF) + return 0; + nbdkit_debug ("ReadFile: error %d", GetLastError ()); + errno = EIO; + return -1; + } + + return r; +} + +#else /* !WIN32 */ +#error "no replacement pread is available on this platform" +#endif + +#endif /* !HAVE_PREAD */ diff --git a/common/replacements/pwrite.c b/common/replacements/pwrite.c new file mode 100644 index 00000000..69cffbab --- /dev/null +++ b/common/replacements/pwrite.c @@ -0,0 +1,77 @@ +/* nbdkit + * Copyright (C) 2019-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* Replacement for pwrite for platforms which lack this function. */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <assert.h> +#include <errno.h> + +#ifndef HAVE_PWRITE + +#include "pwrite.h" + +#ifdef WIN32 + +/* Replacement pwrite for Win32. */ + +#include <windows.h> + +ssize_t +pwrite (int fd, const void *buf, size_t count, off_t offset) +{ + DWORD r; + OVERLAPPED ovl; + + memset (&ovl, 0, sizeof ovl); + /* Seriously WTF Windows? */ + ovl.Offset = offset & 0xffffffff; + ovl.OffsetHigh = offset >> 32; + + /* XXX Will fail weirdly if count is larger than 32 bits. */ + if (!WriteFile (_get_osfhandle (fd), buf, count, &r, &ovl)) { + nbdkit_debug ("WriteFile: error %d", GetLastError ()); + errno = EIO; + return -1; + } + + return r; +} + +#else /* !WIN32 */ +#error "no replacement pwrite is available on this platform" +#endif + +#endif /* !HAVE_PWRITE */ -- 2.27.0