LIBC interception

Ramon Nourequested to merge
rnou/libc into master

Support for libc interception

Edited by Ramon Nou

Merge request reports

CMake/gkfs-options.cmake

+7 −1
Changes for CMake/gkfs-options.cmake: 7 added lines, 1 removed line.
Original line number Diff line number Diff line
@@ -241,6 +241,13 @@ gkfs_define_option( 
    DEFAULT_VALUE ON

)



#build libc

gkfs_define_option(

    GKFS_BUILD_LIBC_INTERCEPTION

    HELP_TEXT "Compile libc interception"

    DEFAULT_VALUE ON

)



# use old resolve function

gkfs_define_option(

    GKFS_USE_LEGACY_PATH_RESOLVE
@@ -287,7 +294,6 @@ gkfs_define_option( 
    DESCRIPTION "Compile with lstat usage in path resolve"

)





################################################################################

# Options and variables that control how GekkoFS behaves internally

################################################################################

include/client/gkfs_functions.hpp

+3 −0
Changes for include/client/gkfs_functions.hpp: 3 added lines, 0 removed lines.
Original line number Diff line number Diff line
@@ -55,6 +55,9 @@ gkfs_open(const std::string& path, mode_t mode, int flags); 
int

gkfs_create(const std::string& path, mode_t mode);



int

gkfs_libcremove(const std::string& path);



int

gkfs_remove(const std::string& path);

include/client/gkfs_libc.hpp

0 → 100644
+74 −0
Changes for include/client/gkfs_libc.hpp: 74 added lines, 0 removed lines.
Original line number Diff line number Diff line 
/*

  Copyright 2018-2025, Barcelona Supercomputing Center (BSC), Spain

  Copyright 2015-2025, Johannes Gutenberg Universitaet Mainz, Germany



  This software was partially supported by the

  EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu).



  This software was partially supported by the

  ADA-FS project under the SPPEXA project funded by the DFG.



  This software was partially supported by the

  the European Union’s Horizon 2020 JTI-EuroHPC research and

  innovation programme, by the project ADMIRE (Project ID: 956748,

  admire-eurohpc.eu)



  This project was partially promoted by the Ministry for Digital Transformation

  and the Civil Service, within the framework of the Recovery,

  Transformation and Resilience Plan - Funded by the European Union

  -NextGenerationEU.



  This file is part of GekkoFS' POSIX interface.



  GekkoFS' POSIX interface is free software: you can redistribute it and/or

  modify it under the terms of the GNU Lesser General Public License as

  published by the Free Software Foundation, either version 3 of the License,

  or (at your option) any later version.



  GekkoFS' POSIX interface is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU Lesser General Public License for more details.



  You should have received a copy of the GNU Lesser General Public License

  along with GekkoFS' POSIX interface.  If not, see

  <https://www.gnu.org/licenses/>.



  SPDX-License-Identifier: LGPL-3.0-or-later

*/





#ifdef __cplusplus

extern "C" {

#endif



#include <dlfcn.h>

#include <sys/stat.h>

#include <dirent.h>

#include <stdlib.h>

#include <stdio.h>

#include <sys/statvfs.h>



#include <sys/types.h>

#include <dirent.h>





#ifndef _STAT_VER

#define _STAT_VER 0

#endif



struct __dirstream {

    int fd; // File descriptor.

    //__libc_lock_define (, lock) // Mutex lock for this structure. //TODO

    size_t allocation; // Space allocated for the block.

    size_t size;       // Total valid data in the block.

    size_t offset;     // Current offset into the block.

    off_t filepos;     // Position of next entry to read.

    // Directory block.

    char* path;

    char data[1] __attribute__((aligned(__alignof__(void*))));

}; // Originally its 0, but C++ does not permit it



#ifdef __cplusplus

}

#endif

include/client/hooks.hpp

+0 −4
Changes for include/client/hooks.hpp: 0 added lines, 4 removed lines.
Original line number Diff line number Diff line
@@ -47,11 +47,7 @@ extern "C" { 
#include <sys/syscall.h>

}



#ifndef BYPASS_SYSCALL

#include <libsyscall_intercept_hook_point.h>

#else

#include <client/void_syscall_intercept.hpp>

#endif



#include <client/intercept.hpp>

include/client/logging.hpp

+1 −4
Changes for include/client/logging.hpp: 1 added line, 4 removed lines.
Original line number Diff line number Diff line
@@ -40,11 +40,8 @@ 
#ifndef LIBGKFS_LOGGING_HPP

#define LIBGKFS_LOGGING_HPP



#ifndef BYPASS_SYSCALL



#include <libsyscall_intercept_hook_point.h>

#else

#include <client/void_syscall_intercept.hpp>

#endif



#include <type_traits>

#include <client/make_array.hpp>