Update README.md

[proxmark3-svn] / client / cmdmain.c

diff --git a/client/cmdmain.c b/client/cmdmain.c
index f407cee4bf601e883206bfbaf4bbe453d8153306..8d9313f9b015f29deab19b9f166c8dcf2b11c376 100644 (file)
--- a/client/cmdmain.c
+++ b/client/cmdmain.c
@@ -8,6 +8,9 @@
 // Main command parser entry point
 //-----------------------------------------------------------------------------
 
+#include "cmdmain.h"
+
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -21,18 +24,15 @@
 #include "cmddata.h"
 #include "cmdhw.h"
 #include "cmdlf.h"
-#include "cmdmain.h"
 #include "util.h"
 #include "util_posix.h"
 #include "cmdscript.h"
-#include "cmdcrc.h"
 
 
 unsigned int current_command = CMD_UNKNOWN;
 
 static int CmdHelp(const char *Cmd);
 static int CmdQuit(const char *Cmd);
-static int CmdRev(const char *Cmd);
 
 //For storing command that are received from the device
 #define CMD_BUFFER_SIZE 50
@@ -41,6 +41,8 @@ static UsbCommand cmdBuffer[CMD_BUFFER_SIZE];
 static int cmd_head;//Starts as 0
 //Points to the position of the last unread command
 static int cmd_tail;//Starts as 0
+// to lock cmdBuffer operations from different threads
+static pthread_mutex_t cmdBufferMutex = PTHREAD_MUTEX_INITIALIZER;
 
 static command_t CommandTable[] = 
 {
@@ -49,7 +51,6 @@ static command_t CommandTable[] =
   {"hf",    CmdHF,    1, "{ High Frequency commands... }"},
   {"hw",    CmdHW,    1, "{ Hardware commands... }"},
   {"lf",    CmdLF,    1, "{ Low Frequency commands... }"},
-  {"reveng",CmdRev,   1, "Crc calculations from the software reveng1-30"},
   {"script",CmdScript,1, "{ Scripting commands }"},
   {"quit",  CmdQuit,  1, "Exit program"},
   {"exit",  CmdQuit,  1, "Exit program"},
@@ -71,12 +72,6 @@ int CmdQuit(const char *Cmd)
   return 99;
 }
 
-int CmdRev(const char *Cmd)
-{
-  CmdCrc(Cmd);
-  return 0;
-}
-
 /**
  * @brief This method should be called when sending a new command to the pm3. In case any old
  *  responses from previous commands are stored in the buffer, a call to this method should clear them.
@@ -86,7 +81,9 @@ int CmdRev(const char *Cmd)
 void clearCommandBuffer()
 {
     //This is a very simple operation
+       pthread_mutex_lock(&cmdBufferMutex);
     cmd_tail = cmd_head;
+       pthread_mutex_unlock(&cmdBufferMutex);
 }
 
 /**
@@ -95,6 +92,7 @@ void clearCommandBuffer()
  */
 void storeCommand(UsbCommand *command)
 {
+       pthread_mutex_lock(&cmdBufferMutex);
     if( ( cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
     {
         //If these two are equal, we're about to overwrite in the
@@ -106,6 +104,7 @@ void storeCommand(UsbCommand *command)
     memcpy(destination, command, sizeof(UsbCommand));
 
     cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
+       pthread_mutex_unlock(&cmdBufferMutex);
 }
 
 
@@ -116,8 +115,10 @@ void storeCommand(UsbCommand *command)
  */
 int getCommand(UsbCommand* response)
 {
+       pthread_mutex_lock(&cmdBufferMutex);
     //If head == tail, there's nothing to read, or if we just got initialized
     if(cmd_head == cmd_tail){
+               pthread_mutex_unlock(&cmdBufferMutex);
         return 0;
     }
     //Pick out the next unread command
@@ -125,7 +126,7 @@ int getCommand(UsbCommand* response)
     memcpy(response, last_unread, sizeof(UsbCommand));
     //Increment tail - this is a circular buffer, so modulo buffer size
     cmd_tail = (cmd_tail +1 ) % CMD_BUFFER_SIZE;
-
+       pthread_mutex_unlock(&cmdBufferMutex);
     return 1;
 }
 
@@ -139,7 +140,7 @@ int getCommand(UsbCommand* response)
  * @param ms_timeout
  * @return true if command was returned, otherwise false
  */
-bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
+bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeout, bool show_warning) {
   
        UsbCommand resp;
        
@@ -147,25 +148,34 @@ bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeou
                response = &resp;
        }
 
+       uint64_t start_time = msclock();
+       
        // Wait until the command is received
-       for(size_t dm_seconds=0; dm_seconds < ms_timeout/10; dm_seconds++) {
+       while (true) {
                while(getCommand(response)) {
                        if(response->cmd == cmd){
                                return true;
                        }
                }
-               msleep(10); // XXX ugh
-               if (dm_seconds == 200) { // Two seconds elapsed
+               if (msclock() - start_time > ms_timeout) {
+                       break;
+               }
+               if (msclock() - start_time > 2000 && show_warning) {
                        PrintAndLog("Waiting for a response from the proxmark...");
-                       PrintAndLog("Don't forget to cancel its operation first by pressing on the button");
+                       PrintAndLog("You can cancel this operation by pressing the pm3 button");
+                       show_warning = false;
                }
        }
        return false;
 }
 
 
+bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
+       return WaitForResponseTimeoutW(cmd, response, ms_timeout, true);
+}
+
 bool WaitForResponse(uint32_t cmd, UsbCommand* response) {
-       return WaitForResponseTimeout(cmd,response,-1);
+       return WaitForResponseTimeoutW(cmd, response, -1, true);
 }