POSIXFileHandler.cpp

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#include "GaudiKernel/IFileMgr.h"
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "POSIXFileHandler.h"
#include "GaudiKernel/MsgStream.h"


/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

POSIXFileHandler::POSIXFileHandler( IMessageSvc* msg ):
  m_log(msg,"POSIXFileHandler") {

  m_level = msg->outputLevel("POSIXFileHandler");

}

  
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

Io::open_t   
POSIXFileHandler::openPOSIXFile(const std::string& n, const Io::IoFlags& f, 
         const std::string& desc, Io::Fd& fd, void*& ptr) {

  m_log.setLevel(m_level);

  if (m_log.level() <= MSG::DEBUG)
    m_log << MSG::DEBUG << "openPOSIXFile(\"" << n << "\"," 
      << f << "," << desc << ")" 
      << endmsg;
  
  ptr = 0;
  fd = -1;

  int mm = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;

  fd = open(n.c_str(), (int) f, mm);
  int ierr = errno;

  if (fd == -1) {
    m_log << MSG::ERROR << "Error opening POSIX file \"" << n << "\": "
      << strerror(ierr)
      << endmsg;
    return 1;
  }

  std::string m;
  if (f.isRead()) {
    m = "r";
  } else if ( f.isWrite() ) {
    if ( (f & Io::APPEND) != 0) {
      m = "a";
    } else {
      m = "w";
    }
  } else if ( f.isRdWr() ) {
    m = "r+";
  } else {
    m_log << MSG::ERROR << "unknown mode " << f
      << " when calling fdopen on " << n
      << endmsg;
    return 1;
  }
      
  
  if (m_log.level() <= MSG::DEBUG) 
    m_log << MSG::DEBUG << "calling fdopen with mode " << m << endmsg;

  FILE* fp = fdopen(fd, m.c_str());
  ierr = errno;
  ptr = (void*) fp;

  if (ptr == 0) {
    m_log << MSG::ERROR << "Error calling fdopen on \"" << n << "\": "
      << strerror(ierr)
      << endmsg;
    return 1;
  }

  m_log << MSG::DEBUG << "opened POSIX file, Fd: " << fd
    << "  FILE*: " << ptr
    << endmsg;

  return 0;

}

//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *//

Io::close_t  
POSIXFileHandler::closePOSIXFile(Io::Fd fd) {

  if (m_log.level() <= MSG::DEBUG)
    m_log << MSG::DEBUG << "closePOSIXFile(fd:" << fd << ")"
      << endmsg;


  if (fd == -1) {
    m_log << MSG::ERROR << "Unable to close file: FD == -1 "
      << endmsg;
    return -1;
  }

  if (close(fd) != 0) {
    int ierr = errno;
    m_log << MSG::ERROR << "Error closing POSIX file with FD " << fd 
      << strerror(ierr)
      << endmsg;
    return -1;
  } 

  return 0;

}


//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *//

Io::reopen_t 
POSIXFileHandler::reopenPOSIXFile(Io::Fd /*fd*/, const Io::IoFlags&) {

  m_log << MSG::ERROR << "reopen not implemented" << endmsg;

  return -1;

}