utils.c

   1 #include <sys/mman.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include "utils.h"
   6
   7
   8 /*
   9  * Use this allocator if you have an object a child writes to that you want
  10  * all other processes to see.
  11  */
  12 void * alloc_shared(unsigned int size)
  13 {
  14         void *ret;
  15
  16         ret = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
  17         if (ret == MAP_FAILED) {
  18                 printf("mmap %u failure\n", size);
  19                 exit(EXIT_FAILURE);
  20         }
  21         return ret;
  22 }
  23
  24 void * zmalloc(size_t size)
  25 {
  26         void *p;
  27
  28         p = malloc(size);
  29         if (p == NULL) {
  30                 printf("malloc(%zu) failure.\n", size);
  31                 exit(EXIT_FAILURE);
  32         }
  33
  34         memset(p, 0, size);
  35         return p;
  36 }
  37
  38 void sizeunit(unsigned long size, char *buf)
  39 {
  40         if (size < 1024 * 1024) {
  41                 sprintf(buf, "%lu bytes", size);
  42                 return;
  43         }
  44
  45         if (size < (1024 * 1024 * 1024)) {
  46                 sprintf(buf, "%ldMB", (size / 1024) / 1024);
  47                 return;
  48         }
  49
  50         sprintf(buf, "%ldGB", ((size / 1024) / 1024) / 1024);
  51 }