Fifo Class Reference

Inheritance diagram for Fifo:

Public Member Functions
void	open (const std::string &path, const std::string &mode="r")
void	unlink (const std::string &path)
virtual size_t	write (const void *v, size_t count)
virtual size_t	read (void *v, size_t count)
int	get_fd () const
bool	select (int sec=-1, int usec=-1)
bool	select2 (int sec=-1, int usec=-1)
bool	close ()

Static Public Member Functions
static Fifo	mkfifo (const std::string &path)

Protected Attributes
int	m_fd

Detailed Description

Definition at line 22 of file Fifo.h.

Constructor & Destructor Documentation

Fifo()

Fifo ( )

inline

Definition at line 28 of file Fifo.h.

{}

~Fifo()

virtual ~Fifo ( )

inlinevirtual

Definition at line 29 of file Fifo.h.

{}

Member Function Documentation

close()

bool close ( )

inherited

Definition at line 90 of file FileDescriptor.cc.

{
  if (m_fd > 0) {
    if (::close(m_fd) != 0) {
      return false;
    }
  }
  m_fd = -1;
  return true;
}

get_fd()

int get_fd ( ) const

inherited

Definition at line 33 of file FileDescriptor.cc.

{
  return m_fd;
}

mkfifo()

Fifo mkfifo ( const std::string &  path )

static

Definition at line 20 of file Fifo.cc.

{
  ::mkfifo(path.c_str(), 0666);
  Fifo fifo;
  fifo.open(path.c_str());
  return fifo;
}

open()

void open	(	const std::string &	path,
		const std::string &	mode = "r"
	)

Definition at line 28 of file Fifo.cc.

{
  int mode = O_RDONLY;
  if (mode_s.find("w") != std::string::npos) {
    mode = O_WRONLY;
    if (mode_s.find("r") != std::string::npos) {
      mode = O_RDWR;
    }
  }
  if ((m_fd = ::open(path.c_str(), mode)) < 0) {
    perror("open");
    throw (IOException("Failed to open fifo."));
  }
}

read()

size_t read ( void *  v, size_t  count  )

virtual

Definition at line 56 of file Fifo.cc.

{
  return ::read(m_fd, buf, count);
}

select()

bool select ( int  sec = -1, int  usec = -1  )

inherited

Definition at line 38 of file FileDescriptor.cc.

{
  if (m_fd <= 0) {
    return false;
  }
  fd_set fds;
  FD_ZERO(&fds);
  FD_SET(m_fd, &fds);
  int ret;
  if (sec >= 0 && usec >= 0) {
    timeval t = {sec, usec};
    ret = ::select(FD_SETSIZE, &fds, NULL, NULL, &t);
  } else {
    ret = ::select(FD_SETSIZE, &fds, NULL, NULL, NULL);
  }
  if (ret < 0) {
    perror("select");
    throw (IOException("Failed to select"));
  }
  if (FD_ISSET(m_fd, &fds)) {
    return true;
  } else {
    return false;
  }
}

select2()

bool select2 ( int  sec = -1, int  usec = -1  )

inherited

Definition at line 64 of file FileDescriptor.cc.

{
  if (m_fd <= 0) {
    return false;
  }
  fd_set fds;
  FD_ZERO(&fds);
  FD_SET(m_fd, &fds);
  int ret;
  if (sec >= 0 && usec >= 0) {
    timeval t = {sec, usec};
    ret = ::select(FD_SETSIZE, NULL, &fds, NULL, &t);
  } else {
    ret = ::select(FD_SETSIZE, NULL, &fds, NULL, NULL);
  }
  if (ret < 0) {
    perror("select");
    throw (IOException("Failed to select"));
  }
  if (FD_ISSET(m_fd, &fds)) {
    return true;
  } else {
    return false;
  }
}

unlink()

void unlink

(

const std::string &

path

)

Definition at line 43 of file Fifo.cc.

{
  if ((::unlink(path.c_str())) < 0) {
    perror("unlink");
  }
  close();
}

write()

size_t write ( const void *  v, size_t  count  )

virtual

Definition at line 51 of file Fifo.cc.

{
  return ::write(m_fd, buf, count);
}

Member Data Documentation

m_fd

int m_fd

protectedinherited

Definition at line 31 of file FileDescriptor.h.

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The documentation for this class was generated from the following files:

• daq/slc/system/include/Fifo.h
• daq/slc/system/src/Fifo.cc