84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _EXECMD_H_INCLUDED_
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#define _EXECMD_H_INCLUDED_
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/* @(#$Id: execmd.h,v 1.8 2006-01-30 11:15:28 dockes Exp $ (C) 2004 J.F.Dockes */
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#include <string>
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#include <list>
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/** Callback function object to advise of new data arrival (or just heartbeat) * if cnt is 0 */
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class ExecCmdAdvise {
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public:
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virtual ~ExecCmdAdvise() {}
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virtual void newData(int cnt) = 0;
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};
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/**
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* Execute command possibly taking both input and output (will do
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* asynchronous io as appropriate for things to work).
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*/
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class ExecCmd {
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public:
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/**
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* Execute command.
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*
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* Both input and output can be specified, and
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* asynchronous io is used to prevent blocking. This wont work if
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* input and output need to be synchronized (ie: Q/A), but ok for
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* filtering.
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* The function is exception-safe. In case an exception occurs in the
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* advise callback, fds and pids will be cleaned-up properly.
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*
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* @param cmd the program to execute. This must be an absolute file name
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* or exist in the PATH.
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* @param args the argument list (NOT including argv[0]).
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* @param input Input to send to the command.
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* @param output Output from the command.
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* @return the exec ouput status (0 if ok).
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*/
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int doexec(const std::string &cmd, const std::list<std::string>& args,
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const std::string *input = 0,
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std::string *output = 0);
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/**
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* Add/replace environment variable before executing command. This should
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* be called before doexec of course (possibly multiple times for several
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* variables).
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* @param envassign an environment assignment string (name=value)
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*/
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void putenv(const std::string &envassign);
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/** Set function object to call whenever new data is available */
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void setAdvise(ExecCmdAdvise *adv) {m_advise = adv;}
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/** Cancel exec. This can be called from another thread or from the
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* advise callback, which could also raise an exception to accomplish
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* the same thing
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*/
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void setCancel() {m_cancelRequest = true;}
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ExecCmd() : m_advise(0), m_cancelRequest(false) {}
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private:
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std::list<std::string> m_env;
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ExecCmdAdvise *m_advise;
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bool m_cancelRequest;
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};
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#endif /* _EXECMD_H_INCLUDED_ */
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