syscalls/msync.c

   1 /*
   2  * SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
   3  */
   4 #include "maps.h"
   5 #include "random.h"
   6 #include "sanitise.h"
   7 #include "shm.h"
   8
   9 #define MS_ASYNC        1               /* Sync memory asynchronously.  */
  10 #define MS_SYNC         4               /* Synchronous memory sync.  */
  11 #define MS_INVALIDATE   2               /* Invalidate the caches.  */
  12
  13 static void sanitise_msync(int childno)
  14 {
  15        (void) common_set_mmap_ptr_len(childno);
  16
  17         if (rand_bool())
  18                 shm->syscall[childno].a3 |= MS_INVALIDATE;
  19 }
  20
  21 struct syscallentry syscall_msync = {
  22         .name = "msync",
  23         .num_args = 3,
  24         .arg1name = "start",
  25         .arg1type = ARG_MMAP,
  26         .arg2name = "len",
  27         .arg3name = "flags",
  28         .arg3type = ARG_OP,
  29         .arg3list = {
  30                 .num = 2,
  31                 .values = { MS_ASYNC, MS_SYNC },
  32         },
  33         .group = GROUP_VM,
  34         .sanitise = sanitise_msync,
  35 };