systemcalls Class Reference

Primitive system calls. More...

#include <systemcalls.h>

Inheritance diagram for systemcalls:

Collaboration diagram for systemcalls:

List of all members.

Public Member Functions
	systemcalls (stringc &command_, stringc &filename_="/tmp/temp.txt")
	Construct everything at start.
int	eval ()
	Evaluate the system call, saving the output to lines.
stringc	output () const
	Output of command.
Public Attributes
bool	file_remove
	Delete the existing file.
bool	combine
	output and error messages combined
string	command
	System command executed.
string	filename
	Redirect output of system command to file for reading.
vector< string >	lines
	Output from system command.

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Detailed Description

Primitive system calls.

This is for integration with other programming languages. Generally programming languages do not talk to eachother, but most write to files. So we can use files to pass information between different applications, programs and programming languages.

Example

  systemcalls sys01("ls","temp.txt");
  sys01.eval();
  for (uint i=0; i<sys01.lines.size(); ++i)
    { cout << sys01.lines[i] << endl; };

Exit Codes http://en.wikipedia.org/wiki/Exit_status

• unix 0-255 ????
• windows signed 32-bit

Definition at line 31 of file systemcalls.h.

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Constructor & Destructor Documentation

systemcalls::systemcalls	(	stringc &	command_,
		stringc &	filename_ = "/tmp/temp.txt"
	)

Construct everything at start.

Definition at line 27 of file systemcalls.cpp.

  : command(command_), filename(filename_) 
{
  file_remove=true;
  combine=false;
}

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Member Function Documentation

int systemcalls::eval

(

)

Evaluate the system call, saving the output to lines.

Definition at line 38 of file systemcalls.cpp.

References combine, command, exitint::exitstatus, file_remove, filename, and lines.

Referenced by mkerrorscompile::compilecode(), projfiles< CFC >::construct(), systemcallstest::developmenttest04(), projunittests::eval(), unittestcmd::eval(), mkerrorscompile::eval(), and systemcallstest::unittest01().

{
  lines.clear();

//stacktrace
//cout << SHOW3(command) << endl;

  // Remove the file first before writing to it.
  if (file_remove==true)
  {
    string s0 = "if [ -e " + filename + " ]; then rm " + filename + "; fi";
    system(s0.c_str());
  }

  string s1(command);
  s1 += " > ";
  s1 += filename;
  // <cmd> > tempfile.txt

  if (combine)
    s1 +=  " 2>&1";
  // <cmd> > tempfile.txt 2>&1
  
//cout << SHOW(s1.c_str()) << endl;
  exitstatus = system(s1.c_str());
  flush(cout);
  //cout << endl; // flush the buffer stream.

//stacktrace
//cout << SHOW3(exitstatus) << endl;

  ifstream in(filename.c_str());
  string str;
  while (in)
  {
    getline(in,str);
    if (str.length() > 0)
      lines.push_back(str);
  }

  return exitstatus;
}

stringc systemcalls::output

(

)

const

Output of command.

Definition at line 12 of file systemcalls.cpp.

References filename, and filestring::serialize().

Referenced by mkerrorscompile::compilecode(), projunittests::eval(), and unittestcmd::eval().

{
  if (filename.empty())
    return "";

  string str;
  
  bool res=filestring::serialize(str,filename);
  if (res==false)
    return "";

  return str;
}

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Member Data Documentation

bool systemcalls::combine

output and error messages combined

Definition at line 42 of file systemcalls.h.

Referenced by mkerrorscompile::compilecode(), eval(), and unittestcmd::eval().

string systemcalls::command

System command executed.

Definition at line 48 of file systemcalls.h.

Referenced by eval().

bool systemcalls::file_remove

Delete the existing file.

Definition at line 39 of file systemcalls.h.

Referenced by eval().

string systemcalls::filename

Redirect output of system command to file for reading.

Definition at line 50 of file systemcalls.h.

Referenced by eval(), and output().

vector<string> systemcalls::lines

Output from system command.

Definition at line 53 of file systemcalls.h.

Referenced by projfiles< CFC >::construct(), systemcallstest::developmenttest04(), eval(), and systemcallstest::unittest01().

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The documentation for this class was generated from the following files:

• makefilebuildtool/systemcalls.h
• makefilebuildtool/systemcalls.cpp