mrw-cxx/mrw/auto.cpp

#include <mrw/auto.hpp>
#include <unistd.h> // close
#include <sys/stat.h> // fstat
#include <sys/mman.h> // mmap

namespace mrw {

  //----------------------------------------------------------------------------
  
  AutoFile& AutoFile::reset(int fd) throw() {
    if (_fd!=-1) close(_fd);
    _fd = fd;
    return *this;
  }
  
  //----------------------------------------------------------------------------
  AutoMapper::AutoMapper(int fd, size_t sz, void* addr,
                         int prot, int flags, off_t off) throw(): _cont(0) {
     if (!(_sz=sz)) {
       struct stat st;
       if (fd==-1 || fstat(fd, &st)==-1) return;
       _sz = st.st_size;
     }
     if ((_cont=mmap(addr, _sz, prot, flags, fd, off))==MAP_FAILED) release();
  }

  //----------------------------------------------------------------------------
  AutoMapper::~AutoMapper() throw() {
    if (_cont && _sz) munmap(_cont, _sz);
  }
}