From 46651ce6fe013220ed397add242004d764fc0153 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 14:15:05 +0200 Subject: Adding upstream version 14.5. Signed-off-by: Daniel Baumann --- src/port/pwrite.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/port/pwrite.c (limited to 'src/port/pwrite.c') diff --git a/src/port/pwrite.c b/src/port/pwrite.c new file mode 100644 index 0000000..282b271 --- /dev/null +++ b/src/port/pwrite.c @@ -0,0 +1,55 @@ +/*------------------------------------------------------------------------- + * + * pwrite.c + * Implementation of pwrite(2) for platforms that lack one. + * + * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group + * + * IDENTIFICATION + * src/port/pwrite.c + * + * Note that this implementation changes the current file position, unlike + * the POSIX function, so we use the name pg_pwrite(). + * + *------------------------------------------------------------------------- + */ + + +#include "postgres.h" + +#ifdef WIN32 +#include +#else +#include +#endif + +ssize_t +pg_pwrite(int fd, const void *buf, size_t size, off_t offset) +{ +#ifdef WIN32 + OVERLAPPED overlapped = {0}; + HANDLE handle; + DWORD result; + + handle = (HANDLE) _get_osfhandle(fd); + if (handle == INVALID_HANDLE_VALUE) + { + errno = EBADF; + return -1; + } + + overlapped.Offset = offset; + if (!WriteFile(handle, buf, size, &result, &overlapped)) + { + _dosmaperr(GetLastError()); + return -1; + } + + return result; +#else + if (lseek(fd, offset, SEEK_SET) < 0) + return -1; + + return write(fd, buf, size); +#endif +} -- cgit v1.2.3