syscalls/write.c

   1 /*
   2  * SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, size_t, count)
   3  */
   4 #include <stdlib.h>
   5 #include "arch.h"       // page_size
   6 #include "maps.h"
   7 #include "sanitise.h"
   8 #include "shm.h"
   9
  10 static void sanitise_write(int childno)
  11 {
  12         if ((rand() % 100) > 50)
  13                 shm->syscall[childno].a3 = 1;
  14         else
  15                 shm->syscall[childno].a3 = rand() % page_size;
  16 }
  17
  18 struct syscallentry syscall_write = {
  19         .name = "write",
  20         .num_args = 3,
  21         .sanitise = sanitise_write,
  22         .arg1name = "fd",
  23         .arg1type = ARG_FD,
  24         .arg2name = "buf",
  25         .arg2type = ARG_NON_NULL_ADDRESS,
  26         .arg3name = "count",
  27         .arg3type = ARG_LEN,
  28         .flags = NEED_ALARM,
  29 };