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#include <signal.h>
#include <iostream>
#include "pin.H"

static BOOL HandleSig(INT32, INT32, CONTEXT *, BOOL hndlr, VOID *);
static BOOL ParseCmdLine(int, char **);
static void Usage();


// These parameters are set from the tool's command line

int Signal = SIGINT;    // Signal to intercept
unsigned Count = 1;     // Tool exits after intercepting signal this many times
BOOL PassToApp = FALSE; // Whether intercepted signals should be passed to application handler


int main(int argc, char **argv)
{
    PIN_Init(argc, argv);
    if (!ParseCmdLine(argc, argv))
        return 1;

    PIN_AddSignalInterceptFunction(Signal, HandleSig, 0);

    PIN_StartProgram();
    return 0;
}


static BOOL HandleSig(INT32 tid, INT32 sig, CONTEXT *ctxt, BOOL hndlr, VOID *v)
{
    cerr << "Thread : " << tid << " Intercepting signal " << sig << endl;
    if (--Count == 0)
        exit(0);
    return PassToApp;
}


static BOOL ParseCmdLine(int argc, char **argv)
{
    // Skip over the Pin arguments.
    //
    int i;
    for (i = 0;  i < argc;  i++)
    {
        if (strcmp(argv[i], "-t") == 0 && (i+2 < argc))
        {
            i += 2;
            break;
        }
    }

    bool done = false;
    for (; i < argc && !done;  i++)
    {
        if (argv[i][0] != '-')
        {
            Usage();
            return FALSE;
        }

        switch (argv[i][1])
        {
          case 's':
          {
            if (i+1 >= argc)
            {
                Usage();
                return FALSE;
            }
            Signal = strtol(argv[i+1], 0, 10);
            if (Signal < 1 || Signal > 64)
            {
                cerr << "Invalid signal number: " << argv[i+i] << endl;
                Usage();
                return FALSE;
            }
            i++;
            break;
          }

          case 'c':
          {
            if (i+1 >= argc)
            {
                Usage();
                return FALSE;
            }
            unsigned long count = strtoul(argv[i+1], 0, 10);
            if (count == 0 || count > UINT_MAX)
            {
                cerr << "Invalid count, must be greater than zero: " << argv[i+1] << endl;
                Usage();
                return FALSE;
            }
            Count = static_cast<unsigned>(count);
            i++;
            break;
          }

          case 'p':
          {
            PassToApp = TRUE;
            break;
          }

          case '-':
          {
            done = TRUE;
            break;
          }

          default:
          {
            cerr << "Invalid argument: " << argv[i] << endl;
            Usage();
            return FALSE;
          }
        }
    }

    return TRUE;
}


static void Usage()
{
    cerr << endl;
    cerr << "pin -t intercepttool [-s <signal>] [-c <count>] [-p]" << endl;
    cerr << "    -s <signal>  - Specifies signal to intercept (default is SIGINT)" << endl;
    cerr << "    -c <count>   - Tool exits after intercepting signal this many times (default 1)" << endl;
    cerr << "    -p           - Tool forwards signal to application after intercepting" << endl;
    cerr << endl;
}