disposefileex1.c - FileDispositionInfoEx test
Posted by Anonymous on Tue 22nd Jul 2025 18:54
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/*
 * Compile with:
 * $ gcc -std=gnu17 -Wall disposefileex1.c -lntdll -o disposefileex1.exe #
 */

#include <stdio.h>
#include <windows.h>
#include <winternl.h>

#define EXIT_USAGE 2

#if 0
typedef struct _FILE_DISPOSITION_INFO_EX {
    DWORD Flags;
} FILE_DISPOSITION_INFO_EX, *PFILE_DISPOSITION_INFO_EX;
#endif


#define FILE_DISPOSITION_DELETE                  0x00000001
#define FILE_DISPOSITION_DO_NOT_DELETE           0x00000002
#define FILE_DISPOSITION_POSIX_DISPOSITION       0x00000003
#define FILE_DISPOSITION_FORCE_IMAGE_DEINSTALL   0x00000004
#define FILE_DISPOSITION_ON_CLOSE                0x00000008
#define FILE_DISPOSITION_SPARSE                  0x00000010


int main(int argc, char *argv[]) {
    int retval;

    if (argc != 2) {
        (void)fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
        return EXIT_USAGE;
    }

    const char *filename = argv[1];
    HANDLE hFile = INVALID_HANDLE_VALUE;

    (void)printf("Attempting to delete file: %s\n", filename);

    hFile = CreateFileA(
        filename,
        DELETE,
        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
        NULL,
        OPEN_EXISTING,
        FILE_FLAG_BACKUP_SEMANTICS|FILE_FLAG_POSIX_SEMANTICS,
        NULL
    );

    if (hFile == INVALID_HANDLE_VALUE) {
        (void)fprintf(stderr,
            "Error: Could not open file '%s'. GetLastError: %ld\n",
            filename, (long)GetLastError());
        return 1;
    }

    (void)printf("Successfully opened file handle.\n");

    FILE_DISPOSITION_INFO_EX fileDispositionInfoEx = {
        .Flags = FILE_DISPOSITION_DELETE | FILE_DISPOSITION_ON_CLOSE
    };

    if (SetFileInformationByHandle(hFile,
        FileDispositionInfoEx,
        &fileDispositionInfoEx,
        sizeof(FILE_DISPOSITION_INFO_EX))) {
        (void)printf("FileDispositionInfoEx success\n");
        retval = EXIT_SUCCESS;
    }
    else {
        (void)printf("FileDispositionInfoEx failed!? lasterr=%ld\n",
            (long)GetLastError());
        retval = EXIT_FAILURE;
    }

    (void)CloseHandle(hFile);
    return retval;
}