420 lines
6.1 KiB
C++
420 lines
6.1 KiB
C++
/*
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* This file is a part of Winix
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2011-2014, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <cstring>
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#include "run.h"
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namespace Winix
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{
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Run::Run()
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{
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Clear();
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}
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void Run::Clear()
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{
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parlen = 0;
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envlen = 0;
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command = 0;
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last_status = 0;
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last_return = 255;
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}
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void Run::SetName()
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{
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size_t i=0;
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while( command[i] )
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i += 1;
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while( i>0 && command[i-1]!='/' )
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i -= 1;
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par[0] = const_cast<char*>(command + i);
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}
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void Run::Par(const char * p)
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{
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if( parlen < WINIX_RUN_MAX_PARAMETERS )
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{
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// they will be copied (fork)
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// the first (zero) parameter is a program name
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par[1 + parlen++] = const_cast<char*>(p);
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}
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}
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void Run::Env(const char * e)
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{
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if( envlen < WINIX_RUN_MAX_PARAMETERS )
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{
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// they will be copied (fork)
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env[envlen++] = const_cast<char*>(e);
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}
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}
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void Run::Cmd(const char * c)
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{
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command = c;
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SetName();
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}
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void Run::Par(const std::string & p)
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{
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Par(p.c_str());
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}
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void Run::Env(const std::string & e)
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{
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Env(e.c_str());
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}
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void Run::Cmd(const std::string & c)
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{
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Cmd(c.c_str());
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}
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int Run::LastStatus()
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{
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return last_status;
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}
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int Run::LastReturn()
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{
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return last_return;
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}
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void Run::Write(const char * in, size_t inlen)
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{
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ssize_t len;
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while( inlen > 0 )
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{
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len = write(desout[1], in, inlen);
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if( len < 0 || len > (ssize_t)inlen )
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{
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// something wrong
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last_status = 3;
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break;
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}
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in += len;
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inlen -= len;
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}
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}
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void Run::Read(std::string & out)
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{
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char buf[1024];
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size_t buflen = sizeof(buf) / sizeof(char);
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ssize_t len;
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do
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{
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len = read(desin[0], buf, buflen);
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if( len < 0 || len > (ssize_t)buflen )
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{
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// something wrong
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last_status = 4;
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break;
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}
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if( len > 0 )
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out.append(buf, len);
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}
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while( len > 0 );
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}
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void Run::ChildThrow()
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{
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if( dup2(desout[0], 0) == -1 )
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return;
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if( dup2(desin[1], 1) == -1 )
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return;
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close(2);
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close(desin[0]);
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close(desout[1]);
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par[parlen+1] = 0;
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env[envlen] = 0;
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execve(command, par, env);
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// if we are here then there is something wrong (execve failed)
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// !! IMPROVE ME may add exit() ?
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}
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void Run::Child()
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{
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try
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{
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ChildThrow();
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}
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catch(...)
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{
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}
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exit(255);
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}
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bool Run::CreatePipes()
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{
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int res = pipe(desin);
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if( res != 0 )
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{
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log << log1 << "Run: pipe failed (desin)" << logend;
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last_status = 1;
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return false;
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}
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res = pipe(desout);
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if( res != 0 )
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{
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log << log1 << "Run: pipe failed (desout)" << logend;
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last_status = 1;
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close(desin[0]);
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close(desin[1]);
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return false;
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}
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return true;
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}
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bool Run::Fork()
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{
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childpid = fork();
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if( childpid == -1 )
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{
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log << log1 << "Run: fork failed" << logend;
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last_status = 2;
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close(desin[0]);
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close(desin[1]);
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close(desout[0]);
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close(desout[1]);
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return false;
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}
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if( childpid == 0 )
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Child();
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return true;
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}
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void Run::WriteRead(const char * in, size_t inlen, std::string * out)
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{
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if( in && inlen>0 )
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Write(in, inlen);
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close(desout[1]);
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if( out )
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Read(*out);
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close(desin[0]);
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}
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void Run::CheckStatus()
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{
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int status;
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pid_t res = waitpid(childpid, &status, 0);
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if( res == -1 )
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{
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log << log1 << "Run: waitpid failed" << logend;
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last_status = 6;
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}
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else
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{
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if( WIFEXITED(status) )
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{
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last_return = WEXITSTATUS(status);
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}
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else
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{
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if( WIFCONTINUED(status) )
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log << log1 << "Run: child error: WIFCONTINUED" << logend;
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else
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if( WIFSIGNALED(status) )
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log << log1 << "Run: child error: WIFSIGNALED" << logend;
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else
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if( WIFSTOPPED(status) )
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log << log1 << "Run: child error: WIFSTOPPED" << logend;
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last_status = 5;
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}
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}
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}
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int Run::Go(const char * in, size_t inlen, std::string * out)
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{
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last_status = 0;
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last_return = 255;
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if( out )
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out->clear();
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if( !command )
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{
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last_status = 7;
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return last_return;
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}
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if( !CreatePipes() )
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return last_return;
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if( !Fork() )
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return last_return;
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// here goes the parent
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close(desin[1]);
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close(desout[0]);
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WriteRead(in, inlen, out);
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CheckStatus();
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if( last_status != 0 )
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log << log1 << "Run: a problem with the command, last_status: " << last_status << logend;
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return last_return;
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}
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int Run::Go(const char * in, size_t inlen, std::string & out)
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{
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return Go(in, inlen, &out);
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}
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int Run::Go(const char * in, std::string & out)
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{
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size_t len = strlen(in);
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return Go(in, len, &out);
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}
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int Run::Go(const char * in, size_t inlen)
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{
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return Go(in, inlen, 0);
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}
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int Run::Go(const char * in)
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{
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size_t len = strlen(in);
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return Go(in, len, 0);
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}
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int Run::Go()
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{
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return Go(0, 0, 0);
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}
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int Run::Go(const std::string in, std::string & out)
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{
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return Go(in.c_str(), in.size(), &out);
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}
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int Run::Go(const std::string in)
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{
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return Go(in.c_str(), in.size(), 0);
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}
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int Run::Go(std::string & out)
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{
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return Go(0, 0, &out);
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}
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} // namespace Winix
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