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Diffstat (limited to 'plugins')
| -rw-r--r-- | plugins/New_GPG/src/include/pstream.h | 2095 |
1 files changed, 0 insertions, 2095 deletions
diff --git a/plugins/New_GPG/src/include/pstream.h b/plugins/New_GPG/src/include/pstream.h deleted file mode 100644 index c0a1f964dd..0000000000 --- a/plugins/New_GPG/src/include/pstream.h +++ /dev/null @@ -1,2095 +0,0 @@ -/* $Id: pstream.h,v 1.112 2010/03/20 14:50:47 redi Exp $ -PStreams - POSIX Process I/O for C++ -Copyright (C) 2001,2002,2003,2004,2005,2006,2007,2008 Jonathan Wakely - -This file is part of PStreams. - -PStreams is free software; you can redistribute it and/or modify -it under the terms of the GNU Lesser General Public License as published by -the Free Software Foundation; either version 3 of the License, or -(at your option) any later version. - -PStreams is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU Lesser General Public License for more details. - -You should have received a copy of the GNU Lesser General Public License -along with this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -/** - * @file pstream.h - * @brief Declares all PStreams classes. - * @author Jonathan Wakely - * - * Defines classes redi::ipstream, redi::opstream, redi::pstream - * and redi::rpstream. - */ - -#ifndef REDI_PSTREAM_H_SEEN -#define REDI_PSTREAM_H_SEEN - -#include <ios> -#include <streambuf> -#include <istream> -#include <ostream> -#include <string> -#include <vector> -#include <algorithm> // for min() -#include <cerrno> // for errno -#include <cstddef> // for size_t -#include <cstdlib> // for exit() -#include <sys/types.h> // for pid_t -#include <sys/wait.h> // for waitpid() -#include <sys/ioctl.h> // for ioctl() and FIONREAD -#if defined(__sun) -# include <sys/filio.h> // for FIONREAD on Solaris 2.5 -#endif -#include <unistd.h> // for pipe() fork() exec() and filedes functions -#include <signal.h> // for kill() -#include <fcntl.h> // for fcntl() -#if REDI_EVISCERATE_PSTREAMS -# include <stdio.h> // for FILE, fdopen() -#endif - - -/// The library version. -#define PSTREAMS_VERSION 0x0070 // 0.7.0 - -/** - * @namespace redi - * @brief All PStreams classes are declared in namespace redi. - * - * Like the standard iostreams, PStreams is a set of class templates, - * taking a character type and traits type. As with the standard streams - * they are most likely to be used with @c char and the default - * traits type, so typedefs for this most common case are provided. - * - * The @c pstream_common class template is not intended to be used directly, - * it is used internally to provide the common functionality for the - * other stream classes. - */ -namespace redi -{ - /// Common base class providing constants and typenames. - struct pstreams - { - /// Type used to specify how to connect to the process. - typedef std::ios_base::openmode pmode; - - /// Type used to hold the arguments for a command. - typedef std::vector<std::string> argv_type; - - /// Type used for file descriptors. - typedef int fd_type; - - 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 - - protected: - enum { bufsz = 32 }; ///< Size of pstreambuf buffers. - enum { pbsz = 2 }; ///< Number of putback characters kept. - }; - - /// Class template for stream buffer. - template <typename CharT, typename Traits = std::char_traits<CharT> > - class basic_pstreambuf - : public std::basic_streambuf<CharT, Traits> - , public pstreams - { - public: - // Type definitions for dependent types - typedef CharT char_type; - typedef Traits traits_type; - typedef typename traits_type::int_type int_type; - typedef typename traits_type::off_type off_type; - typedef typename traits_type::pos_type pos_type; - /** @deprecated use pstreams::fd_type instead. */ - typedef fd_type fd_t; - - /// Default constructor. - basic_pstreambuf(); - - /// Constructor that initialises the buffer with @a command. - basic_pstreambuf(const std::string& command, pmode mode); - - /// Constructor that initialises the buffer with @a file and @a argv. - basic_pstreambuf( const std::string& file, - const argv_type& argv, - pmode mode ); - - /// Destructor. - ~basic_pstreambuf(); - - /// Initialise the stream buffer with @a command. - basic_pstreambuf* - open(const std::string& command, pmode mode); - - /// Initialise the stream buffer with @a file and @a argv. - basic_pstreambuf* - open(const std::string& file, const argv_type& argv, pmode mode); - - /// Close the stream buffer and wait for the process to exit. - basic_pstreambuf* - close(); - - /// Send a signal to the process. - basic_pstreambuf* - kill(int signal = SIGTERM); - - /// Close the pipe connected to the process' stdin. - void - peof(); - - /// Change active input source. - bool - read_err(bool readerr = true); - - /// Report whether the stream buffer has been initialised. - bool - is_open() const; - - /// Report whether the process has exited. - bool - exited(); - -#if REDI_EVISCERATE_PSTREAMS - /// Obtain FILE pointers for each of the process' standard streams. - std::size_t - fopen(FILE*& in, FILE*& out, FILE*& err); -#endif - - /// Return the exit status of the process. - int - status() const; - - /// Return the error number (errno) for the most recent failed operation. - int - error() const; - - protected: - /// Transfer characters to the pipe when character buffer overflows. - int_type - overflow(int_type c); - - /// Transfer characters from the pipe when the character buffer is empty. - int_type - underflow(); - - /// Make a character available to be returned by the next extraction. - int_type - pbackfail(int_type c = traits_type::eof()); - - /// Write any buffered characters to the stream. - int - sync(); - - /// Insert multiple characters into the pipe. - std::streamsize - xsputn(const char_type* s, std::streamsize n); - - /// Insert a sequence of characters into the pipe. - std::streamsize - write(const char_type* s, std::streamsize n); - - /// Extract a sequence of characters from the pipe. - std::streamsize - read(char_type* s, std::streamsize n); - - /// Report how many characters can be read from active input without blocking. - std::streamsize - showmanyc(); - - protected: - /// Enumerated type to indicate whether stdout or stderr is to be read. - enum buf_read_src { rsrc_out = 0, rsrc_err = 1 }; - - /// Initialise pipes and fork process. - pid_t - fork(pmode mode); - - /// Wait for the child process to exit. - int - wait(bool nohang = false); - - /// Return the file descriptor for the output pipe. - fd_type& - wpipe(); - - /// Return the file descriptor for the active input pipe. - fd_type& - rpipe(); - - /// Return the file descriptor for the specified input pipe. - fd_type& - rpipe(buf_read_src which); - - void - create_buffers(pmode mode); - - void - destroy_buffers(pmode mode); - - /// Writes buffered characters to the process' stdin pipe. - bool - empty_buffer(); - - bool - fill_buffer(bool non_blocking = false); - - /// Return the active input buffer. - char_type* - rbuffer(); - - buf_read_src - switch_read_buffer(buf_read_src); - - private: - basic_pstreambuf(const basic_pstreambuf&); - basic_pstreambuf& operator=(const basic_pstreambuf&); - - void - init_rbuffers(); - - pid_t ppid_; // pid of process - fd_type wpipe_; // pipe used to write to process' stdin - fd_type rpipe_[2]; // two pipes to read from, stdout and stderr - char_type* wbuffer_; - char_type* rbuffer_[2]; - char_type* rbufstate_[3]; - /// Index into rpipe_[] to indicate active source for read operations. - buf_read_src rsrc_; - int status_; // hold exit status of child process - int error_; // hold errno if fork() or exec() fails - }; - - /// Class template for common base class. - template <typename CharT, typename Traits = std::char_traits<CharT> > - class pstream_common - : virtual public std::basic_ios<CharT, Traits> - , virtual public pstreams - { - protected: - typedef basic_pstreambuf<CharT, Traits> streambuf_type; - - typedef pstreams::pmode pmode; - typedef pstreams::argv_type argv_type; - - /// Default constructor. - pstream_common(); - - /// Constructor that initialises the stream by starting a process. - pstream_common(const std::string& command, pmode mode); - - /// Constructor that initialises the stream by starting a process. - pstream_common(const std::string& file, const argv_type& argv, pmode mode); - - /// Pure virtual destructor. - virtual - ~pstream_common() = 0; - - /// Start a process. - void - do_open(const std::string& command, pmode mode); - - /// Start a process. - void - do_open(const std::string& file, const argv_type& argv, pmode mode); - - public: - /// Close the pipe. - void - close(); - - /// Report whether the stream's buffer has been initialised. - bool - is_open() const; - - /// Return the command used to initialise the stream. - const std::string& - command() const; - - /// Return a pointer to the stream buffer. - streambuf_type* - rdbuf() const; - -#if REDI_EVISCERATE_PSTREAMS - /// Obtain FILE pointers for each of the process' standard streams. - std::size_t - fopen(FILE*& in, FILE*& out, FILE*& err); -#endif - - protected: - std::string command_; ///< The command used to start the process. - streambuf_type buf_; ///< The stream buffer. - }; - - - /** - * @class basic_ipstream - * @brief Class template for Input PStreams. - * - * Reading from an ipstream reads the command's standard output and/or - * standard error (depending on how the ipstream is opened) - * and the command's standard input is the same as that of the process - * that created the object, unless altered by the command itself. - */ - - template <typename CharT, typename Traits = std::char_traits<CharT> > - class basic_ipstream - : public std::basic_istream<CharT, Traits> - , public pstream_common<CharT, Traits> - , virtual public pstreams - { - typedef std::basic_istream<CharT, Traits> istream_type; - typedef pstream_common<CharT, Traits> pbase_type; - - using pbase_type::buf_; // declare name in this scope - - pmode readable(pmode mode) - { - if (!(mode & (pstdout|pstderr))) - mode |= pstdout; - return mode; - } - - public: - /// Type used to specify how to connect to the process. - typedef typename pbase_type::pmode pmode; - - /// Type used to hold the arguments for a command. - typedef typename pbase_type::argv_type argv_type; - - /// Default constructor, creates an uninitialised stream. - basic_ipstream() - : istream_type(NULL), pbase_type() - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - basic_ipstream(const std::string& command, pmode mode = pstdout) - : istream_type(NULL), pbase_type(command, readable(mode)) - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - basic_ipstream( const std::string& file, - const argv_type& argv, - pmode mode = pstdout ) - : istream_type(NULL), pbase_type(file, argv, readable(mode)) - { } - - /** - * @brief Destructor. - * - * Closes the stream and waits for the child to exit. - */ - ~basic_ipstream() - { } - - /** - * @brief Start a process. - * - * Calls do_open( @a %command , @a mode|pstdout ). - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - void - open(const std::string& command, pmode mode = pstdout) - { - this->do_open(command, readable(mode)); - } - - /** - * @brief Start a process. - * - * Calls do_open( @a file , @a argv , @a mode|pstdout ). - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - void - open( const std::string& file, - const argv_type& argv, - pmode mode = pstdout ) - { - this->do_open(file, argv, readable(mode)); - } - - /** - * @brief Set streambuf to read from process' @c stdout. - * @return @c *this - */ - basic_ipstream& - out() - { - this->buf_.read_err(false); - return *this; - } - - /** - * @brief Set streambuf to read from process' @c stderr. - * @return @c *this - */ - basic_ipstream& - err() - { - this->buf_.read_err(true); - return *this; - } - }; - - - /** - * @class basic_opstream - * @brief Class template for Output PStreams. - * - * Writing to an open opstream writes to the standard input of the command; - * the command's standard output is the same as that of the process that - * created the pstream object, unless altered by the command itself. - */ - - template <typename CharT, typename Traits = std::char_traits<CharT> > - class basic_opstream - : public std::basic_ostream<CharT, Traits> - , public pstream_common<CharT, Traits> - , virtual public pstreams - { - typedef std::basic_ostream<CharT, Traits> ostream_type; - typedef pstream_common<CharT, Traits> pbase_type; - - using pbase_type::buf_; // declare name in this scope - - public: - /// Type used to specify how to connect to the process. - typedef typename pbase_type::pmode pmode; - - /// Type used to hold the arguments for a command. - typedef typename pbase_type::argv_type argv_type; - - /// Default constructor, creates an uninitialised stream. - basic_opstream() - : ostream_type(NULL), pbase_type() - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - basic_opstream(const std::string& command, pmode mode = pstdin) - : ostream_type(NULL), pbase_type(command, mode|pstdin) - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - basic_opstream( const std::string& file, - const argv_type& argv, - pmode mode = pstdin ) - : ostream_type(NULL), pbase_type(file, argv, mode|pstdin) - { } - - /** - * @brief Destructor - * - * Closes the stream and waits for the child to exit. - */ - ~basic_opstream() { } - - /** - * @brief Start a process. - * - * Calls do_open( @a %command , @a mode|pstdin ). - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - void - open(const std::string& command, pmode mode = pstdin) - { - this->do_open(command, mode|pstdin); - } - - /** - * @brief Start a process. - * - * Calls do_open( @a file , @a argv , @a mode|pstdin ). - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - void - open( const std::string& file, - const argv_type& argv, - pmode mode = pstdin) - { - this->do_open(file, argv, mode|pstdin); - } - }; - - - /** - * @class basic_pstream - * @brief Class template for Bidirectional PStreams. - * - * Writing to a pstream opened with @c pmode @c pstdin writes to the - * standard input of the command. - * Reading from a pstream opened with @c pmode @c pstdout and/or @c pstderr - * reads the command's standard output and/or standard error. - * Any of the process' @c stdin, @c stdout or @c stderr that is not - * connected to the pstream (as specified by the @c pmode) - * will be the same as the process that created the pstream object, - * unless altered by the command itself. - */ - template <typename CharT, typename Traits = std::char_traits<CharT> > - class basic_pstream - : public std::basic_iostream<CharT, Traits> - , public pstream_common<CharT, Traits> - , virtual public pstreams - { - typedef std::basic_iostream<CharT, Traits> iostream_type; - typedef pstream_common<CharT, Traits> pbase_type; - - using pbase_type::buf_; // declare name in this scope - - public: - /// Type used to specify how to connect to the process. - typedef typename pbase_type::pmode pmode; - - /// Type used to hold the arguments for a command. - typedef typename pbase_type::argv_type argv_type; - - /// Default constructor, creates an uninitialised stream. - basic_pstream() - : iostream_type(NULL), pbase_type() - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - basic_pstream(const std::string& command, pmode mode = pstdout|pstdin) - : iostream_type(NULL), pbase_type(command, mode) - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - basic_pstream( const std::string& file, - const argv_type& argv, - pmode mode = pstdout|pstdin ) - : iostream_type(NULL), pbase_type(file, argv, mode) - { } - - /** - * @brief Destructor - * - * Closes the stream and waits for the child to exit. - */ - ~basic_pstream() { } - - /** - * @brief Start a process. - * - * Calls do_open( @a %command , @a mode ). - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - void - open(const std::string& command, pmode mode = pstdout|pstdin) - { - this->do_open(command, mode); - } - - /** - * @brief Start a process. - * - * Calls do_open( @a file , @a argv , @a mode ). - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - void - open( const std::string& file, - const argv_type& argv, - pmode mode = pstdout|pstdin ) - { - this->do_open(file, argv, mode); - } - - /** - * @brief Set streambuf to read from process' @c stdout. - * @return @c *this - */ - basic_pstream& - out() - { - this->buf_.read_err(false); - return *this; - } - - /** - * @brief Set streambuf to read from process' @c stderr. - * @return @c *this - */ - basic_pstream& - err() - { - this->buf_.read_err(true); - return *this; - } - }; - - - /** - * @class basic_rpstream - * @brief template for Restricted PStreams. - * - * Writing to an rpstream opened with @c pmode @c 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 @c pmode - * @c pstderr then the class cannot read the process' @c stderr, and - * basic_rpstream::err() will return an istream that reads from the - * process' @c stdout, and vice versa. - * Reading from an rpstream opened with @c pmode @c pstdout and/or - * @c pstderr reads the command's standard output and/or standard error. - * Any of the process' @c stdin, @c stdout or @c stderr that is not - * connected to the pstream (as specified by the @c pmode) - * will be the same as the process that created the pstream object, - * unless altered by the command itself. - */ - - template <typename CharT, typename Traits = std::char_traits<CharT> > - class basic_rpstream - : public std::basic_ostream<CharT, Traits> - , private std::basic_istream<CharT, Traits> - , private pstream_common<CharT, Traits> - , virtual public pstreams - { - typedef std::basic_ostream<CharT, Traits> ostream_type; - typedef std::basic_istream<CharT, Traits> istream_type; - typedef pstream_common<CharT, Traits> pbase_type; - - using pbase_type::buf_; // declare name in this scope - - public: - /// Type used to specify how to connect to the process. - typedef typename pbase_type::pmode pmode; - - /// Type used to hold the arguments for a command. - typedef typename pbase_type::argv_type argv_type; - - /// Default constructor, creates an uninitialised stream. - basic_rpstream() - : ostream_type(NULL), istream_type(NULL), pbase_type() - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - basic_rpstream(const std::string& command, pmode mode = pstdout|pstdin) - : ostream_type(NULL) , istream_type(NULL) , pbase_type(command, mode) - { } - - /** - * @brief Constructor that initialises the stream by starting a process. - * - * Initialises the stream buffer by calling do_open() with the supplied - * arguments. - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - basic_rpstream( const std::string& file, - const argv_type& argv, - pmode mode = pstdout|pstdin ) - : ostream_type(NULL), istream_type(NULL), pbase_type(file, argv, mode) - { } - - /// Destructor - ~basic_rpstream() { } - - /** - * @brief Start a process. - * - * Calls do_open( @a %command , @a mode ). - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - void - open(const std::string& command, pmode mode = pstdout|pstdin) - { - this->do_open(command, mode); - } - - /** - * @brief Start a process. - * - * Calls do_open( @a file , @a argv , @a mode ). - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - void - open( const std::string& file, - const argv_type& argv, - pmode mode = pstdout|pstdin ) - { - this->do_open(file, argv, mode); - } - - /** - * @brief Obtain a reference to the istream that reads - * the process' @c stdout. - * @return @c *this - */ - istream_type& - out() - { - this->buf_.read_err(false); - return *this; - } - - /** - * @brief Obtain a reference to the istream that reads - * the process' @c stderr. - * @return @c *this - */ - istream_type& - err() - { - this->buf_.read_err(true); - return *this; - } - }; - - - /// Type definition for common template specialisation. - typedef basic_pstreambuf<char> pstreambuf; - /// Type definition for common template specialisation. - typedef basic_ipstream<char> ipstream; - /// Type definition for common template specialisation. - typedef basic_opstream<char> opstream; - /// Type definition for common template specialisation. - typedef basic_pstream<char> pstream; - /// Type definition for common template specialisation. - typedef basic_rpstream<char> rpstream; - - - /** - * When inserted into an output pstream the manipulator calls - * basic_pstreambuf<C,T>::peof() to close the output pipe, - * causing the child process to receive the end-of-file indicator - * on subsequent reads from its @c stdin stream. - * - * @brief Manipulator to close the pipe connected to the process' stdin. - * @param s An output PStream class. - * @return The stream object the manipulator was invoked on. - * @see basic_pstreambuf<C,T>::peof() - * @relates basic_opstream basic_pstream basic_rpstream - */ - template <typename C, typename T> - inline std::basic_ostream<C,T>& - peof(std::basic_ostream<C,T>& s) - { - typedef basic_pstreambuf<C,T> pstreambuf; - if (pstreambuf* p = dynamic_cast<pstreambuf*>(s.rdbuf())) - p->peof(); - return s; - } - - - /* - * member definitions for pstreambuf - */ - - - /** - * @class basic_pstreambuf - * Provides underlying streambuf functionality for the PStreams classes. - */ - - /** Creates an uninitialised stream buffer. */ - template <typename C, typename T> - inline - basic_pstreambuf<C,T>::basic_pstreambuf() - : ppid_(-1) // initialise to -1 to indicate no process run yet. - , wpipe_(-1) - , wbuffer_(NULL) - , rsrc_(rsrc_out) - , status_(-1) - , error_(0) - { - init_rbuffers(); - } - - /** - * Initialises the stream buffer by calling open() with the supplied - * arguments. - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see open() - */ - template <typename C, typename T> - inline - basic_pstreambuf<C,T>::basic_pstreambuf(const std::string& command, pmode mode) - : ppid_(-1) // initialise to -1 to indicate no process run yet. - , wpipe_(-1) - , wbuffer_(NULL) - , rsrc_(rsrc_out) - , status_(-1) - , error_(0) - { - init_rbuffers(); - open(command, mode); - } - - /** - * Initialises the stream buffer by calling open() with the supplied - * arguments. - * - * @param file a string containing the name of a program to execute. - * @param argv a vector of argument strings passsed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see open() - */ - template <typename C, typename T> - inline - basic_pstreambuf<C,T>::basic_pstreambuf( const std::string& file, - const argv_type& argv, - pmode mode ) - : ppid_(-1) // initialise to -1 to indicate no process run yet. - , wpipe_(-1) - , wbuffer_(NULL) - , rsrc_(rsrc_out) - , status_(-1) - , error_(0) - { - init_rbuffers(); - open(file, argv, mode); - } - - /** - * Closes the stream by calling close(). - * @see close() - */ - template <typename C, typename T> - inline - basic_pstreambuf<C,T>::~basic_pstreambuf() - { - close(); - } - - /** - * Starts a new process by passing @a command to the shell (/bin/sh) - * and opens pipes to the process with the specified @a mode. - * - * If @a mode contains @c pstdout the initial read source will be - * the child process' stdout, otherwise if @a mode contains @c pstderr - * the initial read source will be the child's stderr. - * - * Will duplicate the actions of the shell in searching for an - * executable file if the specified file name does not contain a slash (/) - * character. - * - * @warning - * There is no way to tell whether the shell command succeeded, this - * function will always succeed unless resource limits (such as - * memory usage, or number of processes or open files) are exceeded. - * This means is_open() will return true even if @a command cannot - * be executed. - * Use pstreambuf::open(const std::string&, const argv_type&, pmode) - * if you need to know whether the command failed to execute. - * - * @param command a string containing a shell command. - * @param mode a bitwise OR of one or more of @c out, @c in, @c err. - * @return NULL if the shell could not be started or the - * pipes could not be opened, @c this otherwise. - * @see <b>execl</b>(3) - */ - template <typename C, typename T> - basic_pstreambuf<C,T>* - basic_pstreambuf<C,T>::open(const std::string& command, pmode mode) - { - const char * shell_path = "/bin/sh"; -#if 0 - const std::string argv[] = { "sh", "-c", command }; - return this->open(shell_path, argv_type(argv, argv+3), mode); -#else - basic_pstreambuf<C,T>* ret = NULL; - - if (!is_open()) - { - switch(fork(mode)) - { - case 0 : - // this is the new process, exec command - ::execl(shell_path, "sh", "-c", command.c_str(), (char*)NULL); - - // can only reach this point if exec() failed - - // parent can get exit code from waitpid() - ::_exit(errno); - // using std::exit() would make static dtors run twice - - case -1 : - // couldn't fork, error already handled in pstreambuf::fork() - break; - - default : - // this is the parent process - // activate buffers - create_buffers(mode); - ret = this; - } - } - return ret; -#endif - } - - /** - * @brief Helper function to close a file descriptor. - * - * Inspects @a fd and calls <b>close</b>(3) if it has a non-negative value. - * - * @param fd a file descriptor. - * @relates basic_pstreambuf - */ - inline void - close_fd(pstreams::fd_type& fd) - { - if (fd >= 0 && ::close(fd) == 0) - fd = -1; - } - - /** - * @brief Helper function to close an array of file descriptors. - * - * Calls @c close_fd() on each member of the array. - * The length of the array is determined automatically by - * template argument deduction to avoid errors. - * - * @param fds an array of file descriptors. - * @relates basic_pstreambuf - */ - template <int N> - inline void - close_fd_array(pstreams::fd_type (&fds)[N]) - { - for (std::size_t i = 0; i < N; ++i) - close_fd(fds[i]); - } - - /** - * Starts a new process by executing @a file with the arguments in - * @a argv and opens pipes to the process with the specified @a mode. - * - * By convention @c argv[0] should be the file name of the file being - * executed. - * - * If @a mode contains @c pstdout the initial read source will be - * the child process' stdout, otherwise if @a mode contains @c pstderr - * the initial read source will be the child's stderr. - * - * Will duplicate the actions of the shell in searching for an - * executable file if the specified file name does not contain a slash (/) - * character. - * - * Iff @a file is successfully executed then is_open() will return true. - * Otherwise, pstreambuf::error() can be used to obtain the value of - * @c errno that was set by <b>execvp</b>(3) in the child process. - * - * The exit status of the new process will be returned by - * pstreambuf::status() after pstreambuf::exited() returns true. - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode a bitwise OR of one or more of @c out, @c in and @c err. - * @return NULL if a pipe could not be opened or if the program could - * not be executed, @c this otherwise. - * @see <b>execvp</b>(3) - */ - template <typename C, typename T> - basic_pstreambuf<C,T>* - basic_pstreambuf<C,T>::open( const std::string& file, - const argv_type& argv, - pmode mode ) - { - basic_pstreambuf<C,T>* ret = NULL; - - if (!is_open()) - { - // constants for read/write ends of pipe - enum { RD, WR }; - - // open another pipe and set close-on-exec - fd_type ck_exec[] = { -1, -1 }; - if (-1 == ::pipe(ck_exec) - || -1 == ::fcntl(ck_exec[RD], F_SETFD, FD_CLOEXEC) - || -1 == ::fcntl(ck_exec[WR], F_SETFD, FD_CLOEXEC)) - { - error_ = errno; - close_fd_array(ck_exec); - } - else - { - switch(fork(mode)) - { - case 0 : - // this is the new process, exec command - { - char** arg_v = new char*[argv.size()+1]; - for (std::size_t i = 0; i < argv.size(); ++i) - { - const std::string& src = argv[i]; - char*& dest = arg_v[i]; - dest = new char[src.size()+1]; - dest[ src.copy(dest, src.size()) ] = '\0'; - } - arg_v[argv.size()] = NULL; - - ::execvp(file.c_str(), arg_v); - - // can only reach this point if exec() failed - - // parent can get error code from ck_exec pipe - error_ = errno; - - ::write(ck_exec[WR], &error_, sizeof(error_)); - ::close(ck_exec[WR]); - ::close(ck_exec[RD]); - - ::_exit(error_); - // using std::exit() would make static dtors run twice - } - - case -1 : - // couldn't fork, error already handled in pstreambuf::fork() - close_fd_array(ck_exec); - break; - - default : - // this is the parent process - - // check child called exec() successfully - ::close(ck_exec[WR]); - switch (::read(ck_exec[RD], &error_, sizeof(error_))) - { - case 0: - // activate buffers - create_buffers(mode); - ret = this; - break; - case -1: - error_ = errno; - break; - default: - // error_ contains error code from child - // call wait() to clean up and set ppid_ to 0 - this->wait(); - break; - } - ::close(ck_exec[RD]); - } - } - } - return ret; - } - - /** - * Creates pipes as specified by @a mode and calls @c fork() to create - * a new process. If the fork is successful the parent process stores - * the child's PID and the opened pipes and the child process replaces - * its standard streams with the opened pipes. - * - * If an error occurs the error code will be set to one of the possible - * errors for @c pipe() or @c fork(). - * See your system's documentation for these error codes. - * - * @param mode an OR of pmodes specifying which of the child's - * standard streams to connect to. - * @return On success the PID of the child is returned in the parent's - * context and zero is returned in the child's context. - * On error -1 is returned and the error code is set appropriately. - */ - template <typename C, typename T> - pid_t - basic_pstreambuf<C,T>::fork(pmode mode) - { - pid_t pid = -1; - - // Three pairs of file descriptors, for pipes connected to the - // process' stdin, stdout and stderr - // (stored in a single array so close_fd_array() can close all at once) - fd_type fd[] = { -1, -1, -1, -1, -1, -1 }; - fd_type* const pin = fd; - fd_type* const pout = fd+2; - fd_type* const perr = fd+4; - - // constants for read/write ends of pipe - enum { RD, WR }; - - // N.B. - // For the pstreambuf pin is an output stream and - // pout and perr are input streams. - - if (!error_ && mode&pstdin && ::pipe(pin)) - error_ = errno; - - if (!error_ && mode&pstdout && ::pipe(pout)) - error_ = errno; - - if (!error_ && mode&pstderr && ::pipe(perr)) - error_ = errno; - - if (!error_) - { - pid = ::fork(); - switch (pid) - { - case 0 : - { - // this is the new process - - // for each open pipe close one end and redirect the - // respective standard stream to the other end - - if (*pin >= 0) - { - ::close(pin[WR]); - ::dup2(pin[RD], STDIN_FILENO); - ::close(pin[RD]); - } - if (*pout >= 0) - { - ::close(pout[RD]); - ::dup2(pout[WR], STDOUT_FILENO); - ::close(pout[WR]); - } - if (*perr >= 0) - { - ::close(perr[RD]); - ::dup2(perr[WR], STDERR_FILENO); - ::close(perr[WR]); - } - break; - } - case -1 : - { - // couldn't fork for some reason - error_ = errno; - // close any open pipes - close_fd_array(fd); - break; - } - default : - { - // this is the parent process, store process' pid - ppid_ = pid; - - // store one end of open pipes and close other end - if (*pin >= 0) - { - wpipe_ = pin[WR]; - ::close(pin[RD]); - } - if (*pout >= 0) - { - rpipe_[rsrc_out] = pout[RD]; - ::close(pout[WR]); - } - if (*perr >= 0) - { - rpipe_[rsrc_err] = perr[RD]; - ::close(perr[WR]); - } - } - } - } - else - { - // close any pipes we opened before failure - close_fd_array(fd); - } - return pid; - } - - /** - * Closes all pipes and calls wait() to wait for the process to finish. - * If an error occurs the error code will be set to one of the possible - * errors for @c waitpid(). - * See your system's documentation for these errors. - * - * @return @c this on successful close or @c NULL if there is no - * process to close or if an error occurs. - */ - template <typename C, typename T> - basic_pstreambuf<C,T>* - basic_pstreambuf<C,T>::close() - { - const bool running = is_open(); - - sync(); // this might call wait() and reap the child process - - // rather than trying to work out whether or not we need to clean up - // just do it anyway, all cleanup functions are safe to call twice. - - destroy_buffers(pstdin|pstdout|pstderr); - - // close pipes before wait() so child gets EOF/SIGPIPE - close_fd(wpipe_); - close_fd_array(rpipe_); - - do - { - error_ = 0; - } while (wait() == -1 && error() == EINTR); - - return running ? this : NULL; - } - - /** - * Called on construction to initialise the arrays used for reading. - */ - template <typename C, typename T> - inline void - basic_pstreambuf<C,T>::init_rbuffers() - { - rpipe_[rsrc_out] = rpipe_[rsrc_err] = -1; - rbuffer_[rsrc_out] = rbuffer_[rsrc_err] = NULL; - rbufstate_[0] = rbufstate_[1] = rbufstate_[2] = NULL; - } - - template <typename C, typename T> - void - basic_pstreambuf<C,T>::create_buffers(pmode mode) - { - if (mode & pstdin) - { - delete[] wbuffer_; - wbuffer_ = new char_type[bufsz]; - this->setp(wbuffer_, wbuffer_ + bufsz); - } - if (mode & pstdout) - { - delete[] rbuffer_[rsrc_out]; - rbuffer_[rsrc_out] = new char_type[bufsz]; - rsrc_ = rsrc_out; - this->setg(rbuffer_[rsrc_out] + pbsz, rbuffer_[rsrc_out] + pbsz, - rbuffer_[rsrc_out] + pbsz); - } - if (mode & pstderr) - { - delete[] rbuffer_[rsrc_err]; - rbuffer_[rsrc_err] = new char_type[bufsz]; - if (!(mode & pstdout)) - { - rsrc_ = rsrc_err; - this->setg(rbuffer_[rsrc_err] + pbsz, rbuffer_[rsrc_err] + pbsz, - rbuffer_[rsrc_err] + pbsz); - } - } - } - - template <typename C, typename T> - void - basic_pstreambuf<C,T>::destroy_buffers(pmode mode) - { - if (mode & pstdin) - { - this->setp(NULL, NULL); - delete[] wbuffer_; - wbuffer_ = NULL; - } - if (mode & pstdout) - { - if (rsrc_ == rsrc_out) - this->setg(NULL, NULL, NULL); - delete[] rbuffer_[rsrc_out]; - rbuffer_[rsrc_out] = NULL; - } - if (mode & pstderr) - { - if (rsrc_ == rsrc_err) - this->setg(NULL, NULL, NULL); - delete[] rbuffer_[rsrc_err]; - rbuffer_[rsrc_err] = NULL; - } - } - - template <typename C, typename T> - typename basic_pstreambuf<C,T>::buf_read_src - basic_pstreambuf<C,T>::switch_read_buffer(buf_read_src src) - { - if (rsrc_ != src) - { - char_type* tmpbufstate[] = {this->eback(), this->gptr(), this->egptr()}; - this->setg(rbufstate_[0], rbufstate_[1], rbufstate_[2]); - for (std::size_t i = 0; i < 3; ++i) - rbufstate_[i] = tmpbufstate[i]; - rsrc_ = src; - } - return rsrc_; - } - - /** - * Suspends execution and waits for the associated process to exit, or - * until a signal is delivered whose action is to terminate the current - * process or to call a signal handling function. If the process has - * already exited (i.e. it is a "zombie" process) then wait() returns - * immediately. Waiting for the child process causes all its system - * resources to be freed. - * - * error() will return EINTR if wait() is interrupted by a signal. - * - * @param nohang true to return immediately if the process has not exited. - * @return 1 if the process has exited and wait() has not yet been called. - * 0 if @a nohang is true and the process has not exited yet. - * -1 if no process has been started or if an error occurs, - * in which case the error can be found using error(). - */ - template <typename C, typename T> - int - basic_pstreambuf<C,T>::wait(bool nohang) - { - int exited = -1; - if (is_open()) - { - int status; - switch(::waitpid(ppid_, &status, nohang ? WNOHANG : 0)) - { - case 0 : - // nohang was true and process has not exited - exited = 0; - break; - case -1 : - error_ = errno; - break; - default : - // process has exited - ppid_ = 0; - status_ = status; - exited = 1; - // Close wpipe, would get SIGPIPE if we used it. - destroy_buffers(pstdin); - close_fd(wpipe_); - // Must free read buffers and pipes on destruction - // or next call to open()/close() - break; - } - } - return exited; - } - - /** - * Sends the specified signal to the process. A signal can be used to - * terminate a child process that would not exit otherwise. - * - * If an error occurs the error code will be set to one of the possible - * errors for @c kill(). See your system's documentation for these errors. - * - * @param signal A signal to send to the child process. - * @return @c this or @c NULL if @c kill() fails. - */ - template <typename C, typename T> - inline basic_pstreambuf<C,T>* - basic_pstreambuf<C,T>::kill(int signal) - { - basic_pstreambuf<C,T>* ret = NULL; - if (is_open()) - { - if (::kill(ppid_, signal)) - error_ = errno; - else - { -#if 0 - // TODO call exited() to check for exit and clean up? leave to user? - if (signal==SIGTERM || signal==SIGKILL) - this->exited(); -#endif - ret = this; - } - } - return ret; - } - - /** - * This function can call pstreambuf::wait() and so may change the - * object's state if the child process has already exited. - * - * @return True if the associated process has exited, false otherwise. - * @see basic_pstreambuf<C,T>::wait() - */ - template <typename C, typename T> - inline bool - basic_pstreambuf<C,T>::exited() - { - return ppid_ == 0 || wait(true)==1; - } - - - /** - * @return The exit status of the child process, or -1 if wait() - * has not yet been called to wait for the child to exit. - * @see basic_pstreambuf<C,T>::wait() - */ - template <typename C, typename T> - inline int - basic_pstreambuf<C,T>::status() const - { - return status_; - } - - /** - * @return The error code of the most recently failed operation, or zero. - */ - template <typename C, typename T> - inline int - basic_pstreambuf<C,T>::error() const - { - return error_; - } - - /** - * Closes the output pipe, causing the child process to receive the - * end-of-file indicator on subsequent reads from its @c stdin stream. - */ - template <typename C, typename T> - inline void - basic_pstreambuf<C,T>::peof() - { - sync(); - destroy_buffers(pstdin); - close_fd(wpipe_); - } - - /** - * Unlike pstreambuf::exited(), this function will not call wait() and - * so will not change the object's state. This means that once a child - * process is executed successfully this function will continue to - * return true even after the process exits (until wait() is called.) - * - * @return true if a previous call to open() succeeded and wait() has - * not been called and determined that the process has exited, - * false otherwise. - */ - template <typename C, typename T> - inline bool - basic_pstreambuf<C,T>::is_open() const - { - return ppid_ > 0; - } - - /** - * Toggle the stream used for reading. If @a readerr is @c true then the - * process' @c stderr output will be used for subsequent extractions, if - * @a readerr is false the the process' stdout will be used. - * @param readerr @c true to read @c stderr, @c false to read @c stdout. - * @return @c true if the requested stream is open and will be used for - * subsequent extractions, @c false otherwise. - */ - template <typename C, typename T> - inline bool - basic_pstreambuf<C,T>::read_err(bool readerr) - { - buf_read_src src = readerr ? rsrc_err : rsrc_out; - if (rpipe_[src]>=0) - { - switch_read_buffer(src); - return true; - } - return false; - } - - /** - * Called when the internal character buffer is not present or is full, - * to transfer the buffer contents to the pipe. - * - * @param c a character to be written to the pipe. - * @return @c traits_type::eof() if an error occurs, otherwise if @a c - * is not equal to @c traits_type::eof() it will be buffered and - * a value other than @c traits_type::eof() returned to indicate - * success. - */ - template <typename C, typename T> - typename basic_pstreambuf<C,T>::int_type - basic_pstreambuf<C,T>::overflow(int_type c) - { - if (!empty_buffer()) - return traits_type::eof(); - else if (!traits_type::eq_int_type(c, traits_type::eof())) - return this->sputc(c); - else - return traits_type::not_eof(c); - } - - - template <typename C, typename T> - int - basic_pstreambuf<C,T>::sync() - { - return !exited() && empty_buffer() ? 0 : -1; - } - - /** - * @param s character buffer. - * @param n buffer length. - * @return the number of characters written. - */ - template <typename C, typename T> - std::streamsize - basic_pstreambuf<C,T>::xsputn(const char_type* s, std::streamsize n) - { - if (n < this->epptr() - this->pptr()) - { - traits_type::copy(this->pptr(), s, n); - this->pbump(n); - return n; - } - else - { - for (std::streamsize i = 0; i < n; ++i) - { - if (traits_type::eq_int_type(this->sputc(s[i]), traits_type::eof())) - return i; - } - return n; - } - } - - /** - * @return true if the buffer was emptied, false otherwise. - */ - template <typename C, typename T> - bool - basic_pstreambuf<C,T>::empty_buffer() - { - const std::streamsize count = this->pptr() - this->pbase(); - if (count > 0) - { - const std::streamsize written = this->write(this->wbuffer_, count); - if (written > 0) - { - if (const std::streamsize unwritten = count - written) - traits_type::move(this->pbase(), this->pbase()+written, unwritten); - this->pbump(-written); - return true; - } - } - return false; - } - - /** - * Called when the internal character buffer is is empty, to re-fill it - * from the pipe. - * - * @return The first available character in the buffer, - * or @c traits_type::eof() in case of failure. - */ - template <typename C, typename T> - typename basic_pstreambuf<C,T>::int_type - basic_pstreambuf<C,T>::underflow() - { - if (this->gptr() < this->egptr() || fill_buffer()) - return traits_type::to_int_type(*this->gptr()); - else - return traits_type::eof(); - } - - /** - * Attempts to make @a c available as the next character to be read by - * @c sgetc(). - * - * @param c a character to make available for extraction. - * @return @a c if the character can be made available, - * @c traits_type::eof() otherwise. - */ - template <typename C, typename T> - typename basic_pstreambuf<C,T>::int_type - basic_pstreambuf<C,T>::pbackfail(int_type c) - { - if (this->gptr() != this->eback()) - { - this->gbump(-1); - if (!traits_type::eq_int_type(c, traits_type::eof())) - *this->gptr() = traits_type::to_char_type(c); - return traits_type::not_eof(c); - } - else - return traits_type::eof(); - } - - template <typename C, typename T> - std::streamsize - basic_pstreambuf<C,T>::showmanyc() - { - int avail = 0; - if (sizeof(char_type) == 1) - avail = fill_buffer(true) ? this->egptr() - this->gptr() : -1; -#ifdef FIONREAD - else - { - if (::ioctl(rpipe(), FIONREAD, &avail) == -1) - avail = -1; - else if (avail) - avail /= sizeof(char_type); - } -#endif - return std::streamsize(avail); - } - - /** - * @return true if the buffer was filled, false otherwise. - */ - template <typename C, typename T> - bool - basic_pstreambuf<C,T>::fill_buffer(bool non_blocking) - { - const std::streamsize pb1 = this->gptr() - this->eback(); - const std::streamsize pb2 = pbsz; - const std::streamsize npb = std::min(pb1, pb2); - - char_type* const rbuf = rbuffer(); - - traits_type::move(rbuf + pbsz - npb, this->gptr() - npb, npb); - - std::streamsize rc = -1; - - if (non_blocking) - { - const int flags = ::fcntl(rpipe(), F_GETFL); - if (flags != -1) - { - const bool blocking = !(flags & O_NONBLOCK); - if (blocking) - ::fcntl(rpipe(), F_SETFL, flags | O_NONBLOCK); // set non-blocking - - error_ = 0; - rc = read(rbuf + pbsz, bufsz - pbsz); - - if (rc == -1 && error_ == EAGAIN) // nothing available - rc = 0; - else if (rc == 0) // EOF - rc = -1; - - if (blocking) - ::fcntl(rpipe(), F_SETFL, flags); // restore - } - } - else - rc = read(rbuf + pbsz, bufsz - pbsz); - - if (rc > 0 || (rc == 0 && non_blocking)) - { - this->setg( rbuf + pbsz - npb, - rbuf + pbsz, - rbuf + pbsz + rc ); - return true; - } - else - { - this->setg(NULL, NULL, NULL); - return false; - } - } - - /** - * Writes up to @a n characters to the pipe from the buffer @a s. - * - * @param s character buffer. - * @param n buffer length. - * @return the number of characters written. - */ - template <typename C, typename T> - inline std::streamsize - basic_pstreambuf<C,T>::write(const char_type* s, std::streamsize n) - { - std::streamsize nwritten = 0; - if (wpipe() >= 0) - { - nwritten = ::write(wpipe(), s, n * sizeof(char_type)); - if (nwritten == -1) - error_ = errno; - else - nwritten /= sizeof(char_type); - } - return nwritten; - } - - /** - * Reads up to @a n characters from the pipe to the buffer @a s. - * - * @param s character buffer. - * @param n buffer length. - * @return the number of characters read. - */ - template <typename C, typename T> - inline std::streamsize - basic_pstreambuf<C,T>::read(char_type* s, std::streamsize n) - { - std::streamsize nread = 0; - if (rpipe() >= 0) - { - nread = ::read(rpipe(), s, n * sizeof(char_type)); - if (nread == -1) - error_ = errno; - else - nread /= sizeof(char_type); - } - return nread; - } - - /** @return a reference to the output file descriptor */ - template <typename C, typename T> - inline typename basic_pstreambuf<C,T>::fd_type& - basic_pstreambuf<C,T>::wpipe() - { - return wpipe_; - } - - /** @return a reference to the active input file descriptor */ - template <typename C, typename T> - inline typename basic_pstreambuf<C,T>::fd_type& - basic_pstreambuf<C,T>::rpipe() - { - return rpipe_[rsrc_]; - } - - /** @return a reference to the specified input file descriptor */ - template <typename C, typename T> - inline typename basic_pstreambuf<C,T>::fd_type& - basic_pstreambuf<C,T>::rpipe(buf_read_src which) - { - return rpipe_[which]; - } - - /** @return a pointer to the start of the active input buffer area. */ - template <typename C, typename T> - inline typename basic_pstreambuf<C,T>::char_type* - basic_pstreambuf<C,T>::rbuffer() - { - return rbuffer_[rsrc_]; - } - - - /* - * member definitions for pstream_common - */ - - /** - * @class pstream_common - * Abstract Base Class providing common functionality for basic_ipstream, - * basic_opstream and basic_pstream. - * pstream_common manages the basic_pstreambuf stream buffer that is used - * by the derived classes to initialise an iostream class. - */ - - /** Creates an uninitialised stream. */ - template <typename C, typename T> - inline - pstream_common<C,T>::pstream_common() - : std::basic_ios<C,T>(NULL) - , command_() - , buf_() - { - this->init(&buf_); - } - - /** - * Initialises the stream buffer by calling - * do_open( @a command , @a mode ) - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, pmode) - */ - template <typename C, typename T> - inline - pstream_common<C,T>::pstream_common(const std::string& command, pmode mode) - : std::basic_ios<C,T>(NULL) - , command_(command) - , buf_() - { - this->init(&buf_); - do_open(command, mode); - } - - /** - * Initialises the stream buffer by calling - * do_open( @a file , @a argv , @a mode ) - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see do_open(const std::string&, const argv_type&, pmode) - */ - template <typename C, typename T> - inline - pstream_common<C,T>::pstream_common( const std::string& file, - const argv_type& argv, - pmode mode ) - : std::basic_ios<C,T>(NULL) - , command_(file) - , buf_() - { - this->init(&buf_); - do_open(file, argv, mode); - } - - /** - * This is a pure virtual function to make @c pstream_common abstract. - * Because it is the destructor it will be called by derived classes - * and so must be defined. It is also protected, to discourage use of - * the PStreams classes through pointers or references to the base class. - * - * @sa If defining a pure virtual seems odd you should read - * http://www.gotw.ca/gotw/031.htm (and the rest of the site as well!) - */ - template <typename C, typename T> - inline - pstream_common<C,T>::~pstream_common() - { - } - - /** - * Calls rdbuf()->open( @a command , @a mode ) - * and sets @c failbit on error. - * - * @param command a string containing a shell command. - * @param mode the I/O mode to use when opening the pipe. - * @see basic_pstreambuf::open(const std::string&, pmode) - */ - template <typename C, typename T> - inline void - pstream_common<C,T>::do_open(const std::string& command, pmode mode) - { - if (!buf_.open((command_=command), mode)) - this->setstate(std::ios_base::failbit); - } - - /** - * Calls rdbuf()->open( @a file, @a argv, @a mode ) - * and sets @c failbit on error. - * - * @param file a string containing the pathname of a program to execute. - * @param argv a vector of argument strings passed to the new program. - * @param mode the I/O mode to use when opening the pipe. - * @see basic_pstreambuf::open(const std::string&, const argv_type&, pmode) - */ - template <typename C, typename T> - inline void - pstream_common<C,T>::do_open( const std::string& file, - const argv_type& argv, - pmode mode ) - { - if (!buf_.open((command_=file), argv, mode)) - this->setstate(std::ios_base::failbit); - } - - /** Calls rdbuf->close() and sets @c failbit on error. */ - template <typename C, typename T> - inline void - pstream_common<C,T>::close() - { - if (!buf_.close()) - this->setstate(std::ios_base::failbit); - } - - /** - * @return rdbuf()->is_open(). - * @see basic_pstreambuf::is_open() - */ - template <typename C, typename T> - inline bool - pstream_common<C,T>::is_open() const - { - return buf_.is_open(); - } - - /** @return a string containing the command used to initialise the stream. */ - template <typename C, typename T> - inline const std::string& - pstream_common<C,T>::command() const - { - return command_; - } - - /** @return a pointer to the private stream buffer member. */ - // TODO document behaviour if buffer replaced. - template <typename C, typename T> - inline typename pstream_common<C,T>::streambuf_type* - pstream_common<C,T>::rdbuf() const - { - return const_cast<streambuf_type*>(&buf_); - } - - -#if REDI_EVISCERATE_PSTREAMS - /** - * @def REDI_EVISCERATE_PSTREAMS - * If this macro has a non-zero value then certain internals of the - * @c basic_pstreambuf template class are exposed. In general this is - * a Bad Thing, as the internal implementation is largely undocumented - * and may be subject to change at any time, so this feature is only - * provided because it might make PStreams useful in situations where - * it is necessary to do Bad Things. - */ - - /** - * @warning This function exposes the internals of the stream buffer and - * should be used with caution. It is the caller's responsibility - * to flush streams etc. in order to clear any buffered data. - * The POSIX.1 function <b>fdopen</b>(3) is used to obtain the - * @c FILE pointers from the streambuf's private file descriptor - * members so consult your system's documentation for - * <b>fdopen</b>(3). - * - * @param in A FILE* that will refer to the process' stdin. - * @param out A FILE* that will refer to the process' stdout. - * @param err A FILE* that will refer to the process' stderr. - * @return An OR of zero or more of @c pstdin, @c pstdout, @c pstderr. - * - * For each open stream shared with the child process a @c FILE* is - * obtained and assigned to the corresponding parameter. For closed - * streams @c NULL is assigned to the parameter. - * The return value can be tested to see which parameters should be - * @c !NULL by masking with the corresponding @c pmode value. - * - * @see <b>fdopen</b>(3) - */ - template <typename C, typename T> - std::size_t - basic_pstreambuf<C,T>::fopen(FILE*& in, FILE*& out, FILE*& err) - { - in = out = err = NULL; - std::size_t open_files = 0; - if (wpipe() > -1) - { - if ((in = ::fdopen(wpipe(), "w"))) - { - open_files |= pstdin; - } - } - if (rpipe(rsrc_out) > -1) - { - if ((out = ::fdopen(rpipe(rsrc_out), "r"))) - { - open_files |= pstdout; - } - } - if (rpipe(rsrc_err) > -1) - { - if ((err = ::fdopen(rpipe(rsrc_err), "r"))) - { - open_files |= pstderr; - } - } - return open_files; - } - - /** - * @warning This function exposes the internals of the stream buffer and - * should be used with caution. - * - * @param in A FILE* that will refer to the process' stdin. - * @param out A FILE* that will refer to the process' stdout. - * @param err A FILE* that will refer to the process' stderr. - * @return A bitwise-or of zero or more of @c pstdin, @c pstdout, @c pstderr. - * @see basic_pstreambuf::fopen() - */ - template <typename C, typename T> - inline std::size_t - pstream_common<C,T>::fopen(FILE*& fin, FILE*& fout, FILE*& ferr) - { - return buf_.fopen(fin, fout, ferr); - } - -#endif // REDI_EVISCERATE_PSTREAMS - - -} // namespace redi - -/** - * @mainpage PStreams Reference - * @htmlinclude mainpage.html - */ - -#endif // REDI_PSTREAM_H_SEEN - -// vim: ts=2 sw=2 expandtab - |