pwrite.c File Reference

#include "postgres.h"
#include <unistd.h>

Include dependency graph for pwrite.c:

Go to the source code of this file.

Functions
ssize_t	pg_pwrite (int fd, const void *buf, size_t size, off_t offset)

Function Documentation

pg_pwrite()

ssize_t pg_pwrite	(	int	fd,
		const void *	buf,
		size_t	size,
		off_t	offset
	)

Definition at line 27 of file pwrite.c.

References _dosmaperr(), and write.

Referenced by AddToDataDirLockFile(), FileWrite(), heap_xlog_logical_rewrite(), qtext_store(), XLogFileInit(), XLogWalRcvWrite(), and XLogWrite().

{
#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
}