text: 
  	/* (c) 2007,2008 Andrei Nigmatulin, Jerome Loyet */
  
  #include <sys/mman.h>
  #include <errno.h>
  #include <string.h>
  
  #include "fpm_shm.h"
  #include "zlog.h"
  
  
  /* MAP_ANON is deprecated, but not in macosx */
  #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
  #define MAP_ANONYMOUS MAP_ANON
  #endif
  
  static size_t fpm_shm_size = 0;
  
  void *fpm_shm_alloc(size_t size) /* {{{ */
  {
  	void *mem;
  
  	mem = mmap(0, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
  
  #ifdef MAP_FAILED
  	if (mem == MAP_FAILED) {
  		zlog(ZLOG_SYSERROR, "unable to allocate %zu bytes in shared memory: %s", size, strerror(errno));
  		return NULL;
  	}
  #endif
  
  	if (!mem) {
  		zlog(ZLOG_SYSERROR, "unable to allocate %zu bytes in shared memory", size);
  		return NULL;
  	}
  
  	fpm_shm_size += size;
  	return mem;
  }
  /* }}} */
  
  int fpm_shm_free(void *mem, size_t size) /* {{{ */
  {
  	if (!mem) {
  		zlog(ZLOG_ERROR, "mem is NULL");
  		return 0;
  	}
  
  	if (munmap(mem, size) == -1) {
  		zlog(ZLOG_SYSERROR, "Unable to free shm");
  		return 0;
  	}
  
  	if (fpm_shm_size - size > 0) {
  		fpm_shm_size -= size;
  	} else {
  		fpm_shm_size = 0;
  	}
  
  	return 1;
  }
  /* }}} */
  
  size_t fpm_shm_get_size_allocated() /* {{{*/
  {
  	return fpm_shm_size;
  }
  /* }}} */
  