/*

    File:       Demo.c

    Description:    This file demonstrates the use of the GetPID calls.

    Author:     Chad Jones 

    Copyright:  © Copyright 2003 Apple Computer, Inc. All rights reserved.

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    Change History (most recent first): 

*/

#include "GetPID.h"

void DemoGetAllPIDsForProcessName(const char* ProcessName)

{

    const int kPIDArrayLength = 100;

    pid_t MyArray [kPIDArrayLength];

    unsigned int NumberOfMatches;

    int Counter, Error;

    /* Here we are calling the function GetAllPIDsForProcessName which wil give us the PIDs

     * of the process name we pass.  

     * First Argument: The BSD process name of the process we want to lookup.  In this case the

     *      the process name passed to us.

     * Second Argument: A preallocated array of pid_t.  This is where the PIDs of matching processes

     *      will be placed on return.  This case our array we already made.

     * Third Argument: The number of pid_t entries located in the array of pid_t (argument 2).  Thus

     *      this is the size of the array in number of PIDs in the array.  Size here is the size of

     *      the array we already allocated (kPIDArrayLength).

     * Forth Argument: On calling this is a pointer to a pre-allocated unsigned integer.  On return

     *      this will hold the number of PIDs placed into the pid_t array (array passed in argument 2).

     * Fifth Argument: A pointer to a pre-allocated integer.  On return this will be the sysctl error returned.

     *      Note here we can also pass NULL in which case this argument will be ignored (as we do here).

     * Return Value: An error indicating success (zero result) or failure (non-zero) result.

     *      Also, if return value is -1 then the requested process doesn't exist (not found).

     *      If the return value is -5 then the buffer we passed wasn't big enough.  (see function description for

     *      for details).

     */

    Error = GetAllPIDsForProcessName(ProcessName, MyArray, kPIDArrayLength, &NumberOfMatches, NULL);

    if (Error == 0) //success!  Print out info

    {

        printf("%s PID(s):    \t", ProcessName);

        for (Counter = 0 ; Counter < NumberOfMatches ; Counter++)

        {

            printf("%d", (int) MyArray[Counter]);

            if (Counter != NumberOfMatches - 1)

                {printf(", ");}

        } 

    }

    else if (Error == -1) //can't find process

    {

        printf("Process Not Found:\t\"%s\"", ProcessName);

    }

    else //other error

    {

        printf("Other Error Getting PID.  Error Code: %d\n", Error);

    }

    printf("\n");

}

int main()

{

    // --- Demo DemoGetAllPIDsForProcessName --- //

    printf("Demo DemoGetAllPIDsForProcessName: \n");

    //Note the BSD name is case sensitive for matching

    DemoGetAllPIDsForProcessName("Finder");

    //On a typical OSX machine there are several nfsiod processes running.  Printing out their PIDs.

    DemoGetAllPIDsForProcessName("nfsiod");

    DemoGetAllPIDsForProcessName("cron");

    DemoGetAllPIDsForProcessName("Bogus Process!");

    // --- Demo the convinence call GetPIDForProcessName --- //

    printf("------------\nDemo GetPIDForProcessName:\n");

    /* Here a PID of -1 returned indicates the that there was an error getting a single PID.  This can happen

     * if the process doesn't exist or even if there is more than one process with the given Process Name.

     * In any case if you get an error result you should probably call GetAllPIDsForProcessName for more

     * information (or to get the PID list)

     */

    printf("Finder PID: %d\n", GetPIDForProcessName("Finder"));

    //On a typical OSX machine there are several nfsiod processes running. 

    printf("nfsiod PID: %d\n", GetPIDForProcessName("nfsiod"));

    printf("cron PID: %d\n", GetPIDForProcessName("cron"));

    printf("BogusProcess! PID: %d\n", GetPIDForProcessName("BogusProcess!"));

    return(0);

}