Pointer to pointer in C -

i hope can me.

i have function in c, takes file, reads line line , stores every line string. works in function

int createdownloadlist(file **dllistref, dltask* tasklist) {     ...     tasklist = (dltask*) malloc(tasksize*allocsize);     int num = 0;     while(getline(&line, &linesize, *dllistref) > 0) {         ...         tasklist[num] = task;         num++;         if(num%8 == 0) {             tasklist = realloc(tasklist, (num+allocsize)*tasksize);         }     }     return num; } 

but want access pointer tasklist outside of function. tried change

int createdownloadlist(file **dllistref, dltask** tasklist) {     size_t linesize = 256;     char* line = (char*) malloc(linesize);     size_t tasksize = sizeof(dltask);     int allocsize = 8;     *tasklist = (dltask*) malloc(tasksize*allocsize);     int num = 0;      while(getline(&line, &linesize, *dllistref) > 0) {         ...         *tasklist[num] = task;         num++;         if(num%8 == 0) {             *tasklist = realloc(tasklist, (num+allocsize)*tasksize);         }     }     return num; } 

but segmentation fault after third task , don't know why. hope can me, clueless, why won't work. oh, , that's how call second function in main method:

dltask* tasklist = null; numoftasks = createdownloadlist(&fileref_dllist, &tasklist) 

i added "&" in call, otherwise it's same call first function.

line

*tasklist = realloc(tasklist, (num+allocsize)*tasksize); 

have be

*tasklist = realloc(*tasklist, (num+allocsize)*tasksize); 

edit

the second error, found out @user3121023, is:

*tasklist[num] = task; 

that should be

(*tasklist)[num] = task;