exec.cpp
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上传日期:2007-06-13
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- /*
- * ===========================================================================
- * PRODUCTION $Log: exec.cpp,v $
- * PRODUCTION Revision 1000.2 2004/06/01 21:04:50 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.7
- * PRODUCTION
- * ===========================================================================
- */
- /* $Id: exec.cpp,v 1000.2 2004/06/01 21:04:50 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software/database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software/database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Authors: Josh Cherry
- *
- * File Description: execute another program, capturing output in strings
- *
- */
- #include <ncbi_pch.hpp>
- #include <gui/utils/exec.hpp>
- #include <corelib/ncbitime.hpp>
- #include <connect/ncbi_pipe.hpp>
- BEGIN_NCBI_SCOPE
- // run an executable using strings for std*
- int CExecute::Exec(const string& cmd,
- const vector<string>& args,
- const string& std_in,
- string& std_out,
- string& std_err,
- STimeout *timeout)
- {
- // open a pipe, with text mode for std_in, std_out, and std_err
- CPipe pipe;
- // set up timeout, if requested
- CStopWatch sw;
- double max_time;
- if (timeout) {
- pipe.SetTimeout(eIO_Open, timeout);
- pipe.SetTimeout(eIO_Close, timeout);
- max_time = timeout->sec + timeout->usec / 1000000.0;
- sw.Start();
- }
- pipe.Open(cmd.c_str(), args, CPipe::fStdErr_Open);
- STimeout short_time = {0, 1};
- pipe.SetTimeout(eIO_Read, &short_time);
- pipe.SetTimeout(eIO_Write, &short_time);
- size_t bytes_written;
- size_t total_bytes_written = 0;
- bool out_done = false;
- bool err_done = false;
- const size_t buf_size = 4096;
- char buf[buf_size];
- while (!out_done || !err_done) {
- // write stdin
- if (total_bytes_written < std_in.size()) {
- pipe.Write(std_in.c_str() + total_bytes_written,
- std_in.size() - total_bytes_written,
- &bytes_written);
- total_bytes_written += bytes_written;
- if (total_bytes_written == std_in.size()) {
- pipe.CloseHandle(CPipe::eStdIn);
- }
- }
- EIO_Status rstatus;
- size_t bytes_read;
- // read stdout
- if (!out_done) {
- rstatus = pipe.Read(buf, buf_size, &bytes_read);
- std_out.append(buf, bytes_read);
- if (rstatus != eIO_Success && rstatus != eIO_Timeout) {
- out_done = true;
- }
- }
- // read stderr
- if (!err_done) {
- rstatus = pipe.Read(buf, buf_size, &bytes_read, CPipe::eStdErr);
- std_err.append(buf, bytes_read);
- if (rstatus != eIO_Success && rstatus != eIO_Timeout) {
- err_done = true;
- }
- }
- // check whether total time (timeout paramater) exceeded
- if (timeout) {
- if (sw.Elapsed() > max_time) {
- pipe.SetTimeout(eIO_Close, &short_time);
- break;
- }
- }
- }
- int exit_value;
- pipe.Close(&exit_value);
- // return the value with which the process exited
- return exit_value;
- }
- END_NCBI_SCOPE
- /*
- * ===========================================================================
- * $Log: exec.cpp,v $
- * Revision 1000.2 2004/06/01 21:04:50 gouriano
- * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.7
- *
- * Revision 1.7 2004/05/21 22:27:51 gorelenk
- * Added PCH ncbi_pch.hpp
- *
- * Revision 1.6 2003/11/17 21:43:52 jcherry
- * Big change to deal properly with long input and output
- *
- * Revision 1.5 2003/09/25 19:10:30 jcherry
- * Moved exec.?pp to gui/utils
- *
- * Revision 1.4 2003/09/25 17:36:27 jcherry
- * Renamed CExec to CExecute to avoid name conflict. Made Exec()
- * really return the process's exit status.
- *
- * Revision 1.3 2003/09/09 22:45:47 jcherry
- * Added timeout
- *
- * Revision 1.2 2003/09/02 23:12:02 jcherry
- * Partial accommodation of changes to CPipe
- *
- * Revision 1.1 2003/07/28 18:19:42 jcherry
- * Initial version
- *
- * ===========================================================================
- */