Знакомство с FUSE

#define FUSE_USE_VERSION 30
 
#include <cstdio>
#include <cstring>
#include <ctime>
#include <fuse.h>
#include <unistd.h>
 
static int my_getattr(const char* path, struct stat* st)
{
  std::printf("[getattr] Called\n");
  std::printf("Attributes of path \"%s\" requested\n", path);
  std::memset(st, 0, sizeof(struct stat));
  
  st->st_uid = getuid();
  st->st_gid = getgid();
  st->st_atime = std::time(nullptr);
  st->st_mtime = std::time(nullptr);
  
  if (std::strcmp(path, "/") == 0)
  {
    st->st_mode = S_IFDIR | 0755;
    st->st_nlink = 2;
  }
  else
  {
    st->st_mode = S_IFREG | 0644;
    st->st_nlink = 1;
    st->st_size = 1024;
  }
 
  return 0;
}
 
static int my_readdir(const char* path,
                      void* buffer,
                      fuse_fill_dir_t filler,
                      off_t offset,
                      struct fuse_file_info* fi)
{
  (void)offset;
  (void)fi;
  std::printf("--> Getting The List of Files of path \"%s\"\n", path);
  
  filler(buffer, ".", nullptr, 0);
  filler(buffer, "..", nullptr, 0);
  
  if (std::strcmp(path, "/") == 0)
  {
    filler(buffer, "file1", nullptr, 0);
    filler(buffer, "file2", nullptr, 0);
  }
  
  return 0;
}
 
static int my_read(const char* path,
                   char* buffer,
                   size_t size,
                   off_t offset,
                   struct fuse_file_info* fi)
{
  (void)fi;
  char file1Text [] = "Hello World From File1!\n";
  char file2Text [] = "Hello World From File2!\n";
  char* selectedText = nullptr;
  
  if (std::strcmp(path, "/file1") == 0)
  {
    selectedText = file1Text;
  }
  else if (std::strcmp(path, "/file2") == 0)
  {
    selectedText = file2Text;
  }
  else
  {
    return -1;
  }
  
  std::memcpy(buffer, selectedText + offset, size);
  return std::strlen(selectedText) - offset;
}
 
int main(int argc, char** argv)
{
  struct fuse_operations operations;
  operations.getattr = my_getattr;
  operations.read = my_read;
  operations.readdir = my_readdir;
  return fuse_main(argc, argv, &operations, nullptr);
}