Hi,
I wrote this shell application(smalltest.efi),did some pipe function test,find
some strange result.
boot into shell:
# test-1,the follow two command should has the same output ,but infact not the
same in QEMU,and the second command failed WriteFile in real machine(AMI bios
uefi 2.6):
ls | smalltest.efi
ls | smalltest.efi | smalltest.efi # the ls command directory only
has one file(this tool),so the tool's buffer 80x25*4 won't overflow.
#test-2
run smalltest.efi,
just key in some chars and Enter,nothing output,why?
my test environment:
UDK2018 + vs2015
QEMU emulator version 2.10.95
OVMF_X64.fd( x64,release build)
the tool's build command:
D:\edk2-vUDK2018>build -p ShellPkg\ShellPkg.dsc -m
ShellPkg\Application2\smalltest\smalltest.inf -a X64 -b RELEASE
//--------code---smalltest.c-------------
#include <Uefi.h>
#include <Library/UefiApplicationEntryPoint.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>//global gST gBS gImageHandle
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Protocol/Shell.h>
#include <Protocol/ShellParameters.h>
EFI_STATUS
EFIAPI
UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS status;
EFI_SHELL_PROTOCOL* gShell;
EFI_SHELL_PARAMETERS_PROTOCOL*gParameters;
UINT16 Buffer[80*25*4]; //tool's buffer;
UINTN BufferSize=sizeof(Buffer);
UINTN BufferByteSize=BufferSize*sizeof(UINT16);
status=gBS->HandleProtocol(gImageHandle,&gEfiShellParametersProtocolGuid,&gParameters);
if(status!=EFI_SUCCESS)
{
Print(L"locate gEfiShellParametersProtocolGuid failed.\n");
return status;
}
status=gBS->LocateProtocol(&gEfiShellProtocolGuid,NULL,&gShell);
if(status!=EFI_SUCCESS)
{
Print(L"locate gEfiShellProtocolGuid failed.\n");
return status;
}
status=gShell->ReadFile(gParameters->StdIn,&BufferByteSize,(VOID*)Buffer);
if(status!=EFI_SUCCESS)
{
Print(L"read from gParameters->StdIn failed.\n");
return status;
}
status=gShell->WriteFile(gParameters->StdOut,&BufferByteSize,(VOID*)Buffer);
if(status!=EFI_SUCCESS)
{
Print(L"wirte gParameters->StdOut failed\n");
return status;
}
gShell->FlushFile(gParameters->StdOut);
return EFI_SUCCESS;
}
//--------code---smalltest.inf-------------
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = smalltest
FILE_GUID = 8F7D7B1D-0E1C-4c98-B12E-4EC99C400704
MODULE_TYPE = UEFI_APPLICATION
VERSION_STRING = 1.0
ENTRY_POINT = UefiMain
[Sources]
smalltest.c
[Packages]
MdePkg/MdePkg.dec
[Protocols]
gEfiShellProtocolGuid
gEfiShellParametersProtocolGuid
[LibraryClasses]
UefiApplicationEntryPoint
UefiLib
//--------code---end----------------------------------------------------------
thank you,
by krishna.
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