omMmap.c File Reference

#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>

Go to the source code of this file.

Functions
static void *	omVallocMmap (size_t size)
static int	omVfreeMmap (void *addr, size_t size)

Function Documentation

omVallocMmap()

static void * omVallocMmap ( size_t  size )

inlinestatic

Definition at line 15 of file omMmap.c.

{
  void* addr;
#ifndef MAP_ANONYMOUS
  static int fd = -1;
#endif
 
#ifdef MAP_ANONYMOUS
#ifndef __CYGWIN__
  /* under cygwin, MAP_PRIVATE|MAP_ANONYMOUS fails */
  addr = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
#else
  /* however, the following works */
  addr = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, -1, 0);
#endif
#else /* !MAP_ANONYMOUS */
  if (fd < 0)
  {
    fd = open("/dev/zero", O_RDWR);
    if (fd < 0) return NULL;
  }
  addr = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
#endif
 
  if (addr == (void*) -1) return NULL;
  return addr;
}

omVfreeMmap()

static int omVfreeMmap ( void *  addr, size_t  size  )

inlinestatic

Definition at line 43 of file omMmap.c.

{
  return munmap(addr, size);
}