syscalls/mincore.c

   1 /*
   2  * SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len, unsigned char __user *, vec)
   3  */
   4 #include <stdlib.h>
   5 #include "arch.h"
   6 #include "maps.h"
   7 #include "sanitise.h"
   8 #include "shm.h"
   9
  10 static void sanitise_mincore(int childno)
  11 {
  12         struct map *map;
  13         unsigned long len;
  14
  15         map = common_set_mmap_ptr_len(childno);
  16
  17         len = map->size + (page_size - 1) / page_size;
  18         shm->syscall[childno].a3 = (unsigned long) malloc(len);
  19 }
  20
  21 static void post_mincore(int childno)
  22 {
  23         free((void *) shm->syscall[childno].a3);
  24 }
  25
  26 struct syscallentry syscall_mincore = {
  27         .name = "mincore",
  28         .num_args = 3,
  29         .arg1name = "start",
  30         .arg1type = ARG_MMAP,
  31         .arg2name = "len",
  32         .arg3name = "vec",
  33         .group = GROUP_VM,
  34         .sanitise = sanitise_mincore,
  35         .post = post_mincore,
  36 };