memzap

replay memory writes
git clone git://git.2f30.org/memzap
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utils.c (597B)

      1 /* See LICENSE file for copyright and license details. */
      2 
      3 #include "proto.h"
      4 
      5 void *
      6 xmalloc(size_t size)
      7 {
      8 	void *p;
      9 
     10 	p = malloc(size);
     11 	if (!p)
     12 		err(1, "malloc");
     13 	return p;
     14 }
     15 
     16 void *
     17 xrealloc(void *ptr, size_t size)
     18 {
     19 	void *p;
     20 
     21 	p = realloc(ptr, size);
     22 	if (!p)
     23 		err(1, "malloc");
     24 	return p;
     25 }
     26 
     27 void *
     28 map_buf(size_t len)
     29 {
     30 	void *buf;
     31 
     32 	buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON,
     33 		   -1, 0);
     34 	if (buf == MAP_FAILED)
     35 		err(1, "mmap");
     36 
     37 	return buf;
     38 }
     39 
     40 void
     41 unmap_buf(void *buf, size_t len)
     42 {
     43 	int ret;
     44 
     45 	ret = munmap(buf, len);
     46 	if (ret < 0)
     47 		err(1, "munmap");
     48 }