[Issue 14422] std.process: Pipes do not append to files on Win64

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14422

--- Comment #1 from Vladimir Panteleev <thecybersha...@gmail.com> ---
C program which reproduces this bug:

/////////////////////// ctest.c ///////////////////////
#include <stdio.h>
#include <windows.h>

void main()
{
    FILE *f;
    PROCESS_INFORMATION pi = {0};
    STARTUPINFO si = {sizeof(STARTUPINFO)};

    f = fopen("test.txt", "w");
    fprintf(f, "AAAAAAAAAA\n");
    fclose(f);

    f = fopen("test.txt", "a");
    si.hStdOutput = (HANDLE)_get_osfhandle(_fileno(f));
    si.dwFlags = STARTF_USESTDHANDLES;
    CreateProcess(NULL, "cmd /c \"echo BBBBB\"",
        NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi);
}
///////////////////////////////////////////////////////

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