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GetPID.h

/*
      File:       GetPID.h
      
      Description:      This file defines a simple API to do process PID lookup based on process name.
      
      Author:           Chad Jones 

      Copyright:  © Copyright 2003 Apple Computer, Inc. All rights reserved.
      
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      Change History (most recent first): 
*/
#if !defined(__DTSSampleCode_GetPID__)
#define __DTSSampleCode_GetPID__ 1

#include <stdlib.h>
#include <stdio.h>

#if defined(__cplusplus)
extern "C" {
#endif
    
// --- Defining constants for use with sample code --- //
enum  {kSuccess = 0,
        kCouldNotFindRequestedProcess = -1, 
        kInvalidArgumentsError = -2,
        kErrorGettingSizeOfBufferRequired = -3,
        kUnableToAllocateMemoryForBuffer = -4,
        kPIDBufferOverrunError = -5};

/*****************************************************
 * GetAllPIDsForProcessName
 *****************************************************
 * Purpose:  This functions purpose is to lookup a BSD
 * process PID given the BSD process name.  This function may
 * potentially return multiple PIDs for a given BSD process name
 * since several processes can have the same BSD process name.
 *
 * Parameters:
 *    ProcessName       A constant C-string.  On calling
 * GetAllPIDsForProcessName this variable holds the BSD process name
 * used to do the process lookup.  Note that the process name you need
 * to pass is the name of the BSD executable process.  If trying
 * to find the PID of an regular OSX application you will need to pass the 
 * name of the actual BSD executable inside an application bundle (rather
 * than the bundle name itself).  In any case as a user you can find the 
 * BSD process name of any process (including OSX applications) by 
 * typing the command "ps -axcocommand,pid" in terminal.
 *
 *    ArrayOfReturnedPIDs     A pointer to a pre-allocated array of pid_t.
 * On calling GetAllPIDsForProcessName this variable must be a pointer to a
 * pre-allocated array of pid_t whos length (in number of pid_t entries) is defined
 * in ArrayOfPIDsLength.  On successful return from GetAllPIDsForProcessName
 * this array will hold the PIDs of all processes which have a matching process
 * name to that specified in the ProcessName input variable.  The number of actual
 * PIDs entered in the array starting at index zero will be the value returned
 * in NumberOfMatchesFound.  On failed return if the error is a buffer overflow
 * error then the buffer will be filled to the  max with PIDs which matched.
 * Otherwise on failed return the state of the array will be undefined.
 *
 *    NumberOfPossiblePIDsInArray   A unsigned integer.  On calling
 * GetAllPIDsForProcessName this variable will hold the number of
 * pre-allocated PID entries which are in the ArrayOfReturnedPIDs for this functions
 * use.  Note this value must have a value greater than zero.
 *
 *    NumberOfMatchesFound    An unsigned integer.  On calling GetAllPIDsForProcessName
 * this variable will point to a pre-allocated unsigned integer.  On return from
 * GetAllPIDsForProcessName this variable will contain the number of PIDs contained in the
 * ArrayOfReturnedPIDs.  On failed return the value of the variable will be undefined.
 *
 *    SysctlError A pointer to a pre-allocated integer.  On failed return, this
 * variable represents the error returned from the sysctl command.  On function
 * success this variable will have a value specified by the sysctl based on the
 * error that occurred.  On success the variable will have the value zero.
 * Note this variable can also be NULL in which case the variable is ignored.
 *
 *    *Function Result*       A integer return value.
 *                      See result codes listed below.
 *          Result Codes:
 *            0         Success.  A set of process PIDs were found and are located in
 *                      ArrayOfReturnedPIDs array.
 *           -1         Could not find a process with a matching process name
 *                              (i.e. process not found).
 *           -2         Invalid arguments passed.
 *           -3         Unable to get the size of sysctl buffer required
 *                      (consult SysctlError return value for more information)
 *           -4         Unable to allocate memory to store BSD process information
 *                      (consult SysctlError return value for more information)
 *           -5         The array passed to hold the returned PIDs is not large enough
 *                      to hold all PIDs of process with matching names.
 *
 *****************************************************/
int GetAllPIDsForProcessName(const char* ProcessName,
                             pid_t ArrayOfReturnedPIDs[],
                             const unsigned int NumberOfPossiblePIDsInArray,
                             unsigned int* NumberOfMatchesFound,
                             int* SysctlError); //Can be NULL

/*****************************************************
 * GetPIDForProcessName
 *****************************************************
 * Purpose:  A convience call for GetAllPIDsForProcessName().
 * This function looks up a process PID given a BSD process 
 * name.  
 *
 * Parameters:
 *    ProcessName       A constant C-string.  On calling
 * GetPIDForProcessName this variable holds the BSD process name
 * used to do the process lookup.  Note that the process name you need
 * to pass is the name of the BSD executable process.  If trying
 * to find the PID of an regular OSX application you will need to pass the
 * name of the actual BSD executable inside an application bundle (rather
 * than the bundle name itself).  In any case as a user you can find the
 * BSD process name of any process (including OSX applications) by
 * typing the command "ps -axcocommand,pid" in terminal.
 *
 *    *Function Result*       A integer return value.
 *                      See result codes listed below.
 *          Result Codes:
 *            >=0             Success.  The value returned is the PID of the 
 *                      requested process.
 *           -1         Error getting PID for requested process.  This error can
 *                      be caused by several things.  One is if no such process exists.
 *                      Another is if more than one process has the given name.  The
 *                      Answer is to call GetAllPIDsForProcessName()
 *                      for complete error code or to get PIDs if there are multiple
 *                      processes with that name.
 *****************************************************/
int GetPIDForProcessName(const char* ProcessName);

#if defined(__cplusplus)
}
#endif

#endif

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