NAME

       redi::basic_rpstream - Class template for Restricted PStreams

SYNOPSIS

       #include <pstream.h>

       Inherits basic_ostream< CharT, std::char_traits< CharT > >, basic_istream< CharT,
       std::char_traits< CharT > >, redi::pstream_common< CharT, std::char_traits< CharT > >, and
       redi::pstreams.

   Public Types
       typedef pbase_type::pmode pmode
           Type used to specify how to connect to the process.
       typedef pbase_type::argv_type argv_type
           Type used to hold the arguments for a command.
       typedef int fd_type
           Type used for file descriptors.

   Public Member Functions
       basic_rpstream ()
           Default constructor, creates an uninitialised stream.
       basic_rpstream (const std::string &cmd, pmode mode=pstdout|pstdin)
           Constructor that initialises the stream by starting a process.
       basic_rpstream (const std::string &file, const argv_type &argv, pmode mode=pstdout|pstdin)
           Constructor that initialises the stream by starting a process.
       basic_rpstream (const argv_type &argv, pmode mode=pstdout|pstdin)
           Constructor that initialises the stream by starting a process.
       ~basic_rpstream ()
           Destructor.
       void open (const std::string &cmd, pmode mode=pstdout|pstdin)
           Start a process.
       void open (const std::string &file, const argv_type &argv, pmode mode=pstdout|pstdin)
           Start a process.
       istream_type & out ()
           Obtain a reference to the istream that reads the process' stdout.
       istream_type & err ()
           Obtain a reference to the istream that reads the process' stderr.

   Static Public Attributes
       static const pmode pstdin = std::ios_base::out
           Write to stdin.
       static const pmode pstdout = std::ios_base::in
           Read from stdout.
       static const pmode pstderr = std::ios_base::app
           Read from stderr.
       static const pmode newpg = std::ios_base::trunc
           Create a new process group for the child process.

   Protected Types
       enum { bufsz = 32 }
       enum { pbsz = 2 }

Detailed Description

   template<typename CharT, typename Traits = std::char_traits<CharT>>
       class redi::basic_rpstream< CharT, Traits >" Class template for Restricted PStreams.

       Writing to an rpstream opened with pmode pstdin writes to the standard input of the
       command. It is not possible to read directly from an rpstream object, to use an rpstream
       as in istream you must call either basic_rpstream::out() or basic_rpstream::err(). This is
       to prevent accidental reads from the wrong input source. If the rpstream was not opened
       with pmode pstderr then the class cannot read the process' stderr, and
       basic_rpstream::err() will return an istream that reads from the process' stdout, and vice
       versa. Reading from an rpstream opened with pmode pstdout and/or pstderr reads the
       command's standard output and/or standard error. Any of the process' stdin, stdout or
       stderr that is not connected to the pstream (as specified by the pmode) will be the same
       as the process that created the pstream object, unless altered by the command itself.

Constructor & Destructor Documentation

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_rpstream<
       CharT, Traits >::basic_rpstream (const std::string & cmd, pmode mode = pstdout|pstdin)
       [inline],  [explicit]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open() with the supplied arguments.

       Parameters
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, pmode)

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_rpstream<
       CharT, Traits >::basic_rpstream (const std::string & file, const argv_type & argv, pmode
       mode = pstdout|pstdin) [inline]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open() with the supplied arguments.

       Parameters
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, const argv_type&, pmode)

   template<typename CharT , typename Traits  = std::char_traits<CharT>> redi::basic_rpstream<
       CharT, Traits >::basic_rpstream (const argv_type & argv, pmode mode = pstdout|pstdin)
       [inline],  [explicit]
       Constructor that initialises the stream by starting a process. Initialises the stream
       buffer by calling do_open(argv[0],argv,mode)

       Parameters
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, const argv_type&, pmode)

Member Function Documentation

   template<typename CharT , typename Traits  = std::char_traits<CharT>> istream_type&
       redi::basic_rpstream< CharT, Traits >::err () [inline]
       Obtain a reference to the istream that reads the process' stderr.

       Returns
           *this

       References redi::basic_pstreambuf< CharT, Traits >::read_err().

   template<typename CharT , typename Traits  = std::char_traits<CharT>> void
       redi::basic_rpstream< CharT, Traits >::open (const std::string & cmd, pmode mode =
       pstdout|pstdin) [inline]
       Start a process. Calls do_open( cmd , mode ).

       Parameters
           cmd a string containing a shell command.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, pmode)

       References redi::pstream_common< CharT, std::char_traits< CharT > >::do_open().

   template<typename CharT , typename Traits  = std::char_traits<CharT>> void
       redi::basic_rpstream< CharT, Traits >::open (const std::string & file, const argv_type &
       argv, pmode mode = pstdout|pstdin) [inline]
       Start a process. Calls do_open( file , argv , mode ).

       Parameters
           file a string containing the pathname of a program to execute.
           argv a vector of argument strings passed to the new program.
           mode the I/O mode to use when opening the pipe.

       See also
           do_open(const std::string&, const argv_type&, pmode)

       References redi::pstream_common< CharT, std::char_traits< CharT > >::do_open().

   template<typename CharT , typename Traits  = std::char_traits<CharT>> istream_type&
       redi::basic_rpstream< CharT, Traits >::out () [inline]
       Obtain a reference to the istream that reads the process' stdout.

       Returns
           *this

       References redi::basic_pstreambuf< CharT, Traits >::read_err().

Author

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