return 0; 
return data; 
int map(struct mm_id *mm_idp, unsigned long virt, unsigned long len,        int r, int w, int x, int phys_fd, unsigned long long offset){        int prot, n;        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |                (x ? PROT_EXEC : 0);        if(proc_mm){                struct proc_mm_op map;                int fd = mm_idp->u.mm_fd;                map = ((struct proc_mm_op) { .op	= MM_MMAP,                                             .u		=                                             { .mmap	=                                               { .addr	= virt,                                                 .len	= len,                                                 .prot	= prot,                                                 .flags	= MAP_SHARED |                                                 MAP_FIXED,                                                 .fd	= phys_fd,                                                 .offset= offset                                               } } } );                n = os_write_file(fd, &map, sizeof(map));                if(n != sizeof(map))                        printk("map : /proc/mm map failed, err = %d\n", -n);        }        else {                long res;                unsigned long args[] = { virt, len, prot,                                         MAP_SHARED | MAP_FIXED, phys_fd,                                         MMAP_OFFSET(offset) };                res = run_syscall_stub(mm_idp, STUB_MMAP_NR, args);                if((void *) res == MAP_FAILED)                        printk("mmap stub failed, errno = %d\n", res);        }        return 0;}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/c56004901fa5dcf55f92318f192ab3c0e87db2d1/mem_user.c/buggy/arch/um/kernel/skas/mem_user.c