Verified Commit ae5d4d4a authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept fflush

parent 4086b176

ifs/include/preload/passthrough.hpp

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ extern void* libc_clearerr; 
extern void* libc_feof;

extern void* libc_ferror;

extern void* libc_fileno;

extern void* libc_fflush;



extern void* libc_mkdir;

extern void* libc_mkdirat;

ifs/src/preload/intcp_functions.cpp

+13 −0
Original line number Diff line number Diff line
@@ -265,6 +265,19 @@ int ferror(FILE *stream) { 
    return (reinterpret_cast<decltype(&ferror)>(libc_ferror))(stream);

}



int fflush(FILE *stream) {

    init_passthrough_if_needed();

    if(CTX->initialized() && (stream != nullptr)) {

        auto fd = file_to_fd(stream);

        if(CTX->file_map()->exist(fd)) {

            CTX->log()->trace("{}() called with fd {}", __func__, fd);

            return 0;

        }

    }

    return (reinterpret_cast<decltype(&fflush)>(libc_fflush))(stream);



}



/******  FILE OPS  ******/



#undef creat

ifs/src/preload/passthrough.cpp

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ void* libc_clearerr; 
void* libc_feof;

void* libc_ferror;

void* libc_fileno;

void* libc_fflush;



void* libc_mkdir;

void* libc_mkdirat;
@@ -107,6 +108,7 @@ void init_passthrough_() { 
    libc_feof = dlsym(libc, "feof");

    libc_ferror = dlsym(libc, "ferror");

    libc_fileno = dlsym(libc, "fileno");

    libc_fflush = dlsym(libc, "fflush");



    libc_mkdir = dlsym(libc, "mkdir");

    libc_mkdirat = dlsym(libc, "mkdirat");