src/mman/mremap.c

   1 #define _GNU_SOURCE
   2 #include <unistd.h>
   3 #include <sys/mman.h>
   4 #include <errno.h>
   5 #include <stdint.h>
   6 #include <stdarg.h>
   7 #include "syscall.h"
   8
   9 static void dummy(void) { }
  10 weak_alias(dummy, __vm_wait);
  11
  12 void *__mremap(void *old_addr, size_t old_len, size_t new_len, int flags, ...)
  13 {
  14         va_list ap;
  15         void *new_addr = 0;
  16
  17         if (new_len >= PTRDIFF_MAX) {
  18                 errno = ENOMEM;
  19                 return MAP_FAILED;
  20         }
  21
  22         if (flags & MREMAP_FIXED) {
  23                 __vm_wait();
  24                 va_start(ap, flags);
  25                 new_addr = va_arg(ap, void *);
  26                 va_end(ap);
  27         }
  28
  29         return (void *)syscall(SYS_mremap, old_addr, old_len, new_len, flags, new_addr);
  30 }
  31
  32 weak_alias(__mremap, mremap);