win32common.c File Reference

#include "postgres.h"

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Functions
DWORD	pgwin32_get_file_type (HANDLE hFile)

Function Documentation

pgwin32_get_file_type()

DWORD pgwin32_get_file_type

(

HANDLE

hFile

)

Definition at line 31 of file win32common.c.

{
    DWORD       fileType = FILE_TYPE_UNKNOWN;
    DWORD       lastError;
 
    errno = 0;
 
    /*
     * When stdin, stdout, and stderr aren't associated with a stream the
     * special value -2 is returned:
     * https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle
     */
    if (hFile == INVALID_HANDLE_VALUE || hFile == (HANDLE) -2)
    {
        errno = EINVAL;
        return FILE_TYPE_UNKNOWN;
    }
 
    fileType = GetFileType(hFile);
    lastError = GetLastError();
 
    /*
     * Invoke GetLastError in order to distinguish between a "valid" return of
     * FILE_TYPE_UNKNOWN and its return due to a calling error.  In case of
     * success, GetLastError() returns NO_ERROR.
     */
    if (fileType == FILE_TYPE_UNKNOWN && lastError != NO_ERROR)
    {
        _dosmaperr(lastError);
        return FILE_TYPE_UNKNOWN;
    }
 
    return fileType;
}

References _dosmaperr().

Referenced by _pgfstat64().