compat-linux.c

   1 /*
   2  * Sane compat.c for Linux
   3  */
   4 #define _GNU_SOURCE
   5
   6 #include <stdlib.h>
   7 #include <sys/mman.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10
  11 #include "lib.h"
  12 #include "token.h"
  13
  14 /*
  15  * Allow old BSD naming too, it would be a pity to have to make a
  16  * separate file just for this.
  17  */
  18 #ifndef MAP_ANONYMOUS
  19 #define MAP_ANONYMOUS MAP_ANON
  20 #endif
  21
  22 /*
  23  * Our blob allocator enforces the strict CHUNK size
  24  * requirement, as a portability check.
  25  */
  26 void *blob_alloc(unsigned long size)
  27 {
  28         void *ptr;
  29
  30         if (size & ~CHUNK)
  31                 die("internal error: bad allocation size (%d bytes)", size);
  32         ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  33         if (ptr == MAP_FAILED)
  34                 ptr = NULL;
  35         return ptr;
  36 }
  37
  38 void blob_free(void *addr, unsigned long size)
  39 {
  40         if (!size || (size & ~CHUNK) || ((unsigned long) addr & 512))
  41                 die("internal error: bad blob free (%d bytes at %p)", size, addr);
  42         munmap(addr, size);
  43 }
  44
  45 long double string_to_ld(const char *nptr, char **endptr)
  46 {
  47         return strtold(nptr, endptr);
  48 }
  49
  50 int identical_files(struct stream* s, struct stat *st, const char * name)
  51 {
  52         return s->dev == st->st_dev && s->ino == st->st_ino;
  53 }