[ts-7000] malloc()

[Jason Stahls <>]

I'm running into a _very_ weird error where I call malloc() three times 
for three pointers and get three unique memory pointers as I would 
expect, at the end of my loop I free them all and set the pointers to 
NULL.  Next time around I call malloc three times for the same pointers 
and I get back three pointers that are the same. Eg.

first time -
  pt1 = 0x12228
  pt2 = 0x12630
  pt3 = 0x12a38

second time -
  pt1 = 0x12228
  pt2 = 0x12228
  pt3 = 0x12228

and I'll keep getting the same result again and again... 

Now, a co-worker has raised a question about if this is a result of me 
misusing strtok_r(), I think I'm using it correctly but not sure.  Heres 
a snippit from the code

                                printf("Main loop: readBuf->%s<-",readBuf);
                                // Grab more memory
                                tempBuf = malloc(MAXMSG);
                                printf("tempBuf\n");
                                tokBuf = malloc(MAXMSG);
                                printf("tokBuf\n");
                                //tokPtr = malloc(MAXMSG);
                                //printf("tokPtr\n");
       
                                 if ( (tempBuf == NULL) || (tokBuf == 
NULL) || (tokPtr == NULL) ){
                                           printf("Memory allocation 
error!\n");
                                           exit(-1);
                                 }

                                printf("Main loop: 
tempBuf->%s<-\n",tempBuf);
                                printf("Main loop: tokBuf->%s<-\n",tokBuf);
                                printf("Main loop: tempBuf 
->%x\n",(unsigned int) tempBuf);
                                printf("Main loop: tokBuf 
->%x\n",(unsigned int) tokBuf);
                                printf("Main loop: tokPtr 
->%x\n",(unsigned int) tokPtr);

                                strncpy(tempBuf, readBuf, MAXMSG);
                                memset(tokBuf, 0, MAXMSG);
                                memset(tokPtr, 0, MAXMSG);
                                printf("Main loop: 
tempBuf->%s<-\n",tempBuf);

                                tokBuf = strtok_r(tempBuf,":",tokPtr);
                                printf("Main loop: tokBuf->%s<-\n",tokBuf);

                                if ( tokBuf == NULL ) {
                                        printf("Main loop: Invalid 
command\n");
                                }
                               <-- SNIP -->
                                free(tempBuf);
                                //free(tokPtr);
                                free(tokBuf);
                               
                                tempBuf = NULL;
                                //tokPtr = NULL;
                                tokBuf = NULL;

This gets looped everytime the program recives a message from a socket 
that is connected earlier.

Any ideas?

Jason



 
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