src/system/libroot/posix/errno.c

   1 /*
   2 ** Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3 ** Distributed under the terms of the MIT License.
   4 */
   5
   6 /* Provides user space storage for "errno", located in TLS
   7  */
   8
   9 #include <errno.h>
  10
  11 #include "support/TLS.h"
  12 #include "tls.h"
  13
  14
  15 int *
  16 _errnop(void)
  17 {
  18         return (int *)tls_address(TLS_ERRNO_SLOT);
  19 }
  20
  21
  22 // This is part of the Linuxbase binary specification
  23 // and is referenced by some code in libgcc.a.
  24 // ToDo: maybe we even want to include this always
  25 #ifdef __linux__
  26 extern int *(*__errno_location)(void) __attribute__ ((weak, alias("_errnop")));
  27 #endif
  28
  29
  30 // #pragma mark -
  31
  32
  33 int
  34 _to_positive_error(int error)
  35 {
  36         if (error < 0)
  37                 return error == B_NO_MEMORY ? -B_POSIX_ENOMEM : -error;
  38         return error;
  39 }
  40
  41
  42 int
  43 _to_negative_error(int error)
  44 {
  45         return error > 0 ? -error : error;
  46 }