newlib/libc/reent/linkr.c

   1 /* Reentrant versions of file system calls.  These implementations
   2    just call the usual system calls.  */
   3
   4 #include <reent.h>
   5 #include <unistd.h>
   6 #include <_syslist.h>
   7
   8 /* Some targets provides their own versions of these functions.  Those
   9    targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
  10
  11 #ifdef _REENT_ONLY
  12 #ifndef REENTRANT_SYSCALLS_PROVIDED
  13 #define REENTRANT_SYSCALLS_PROVIDED
  14 #endif
  15 #endif
  16
  17 #ifdef REENTRANT_SYSCALLS_PROVIDED
  18
  19 int _dummy_link_syscalls = 1;
  20
  21 #else
  22
  23 /* We use the errno variable used by the system dependent layer.  */
  24 #undef errno
  25 extern int errno;
  26
  27 /*
  28 FUNCTION
  29         <<_link_r>>---Reentrant version of link
  30
  31 INDEX
  32         _link_r
  33
  34 SYNOPSIS
  35         #include <reent.h>
  36         int _link_r(struct _reent *<[ptr]>,
  37                     const char *<[old]>, const char *<[new]>);
  38
  39 DESCRIPTION
  40         This is a reentrant version of <<link>>.  It
  41         takes a pointer to the global data block, which holds
  42         <<errno>>.
  43 */
  44
  45 int
  46 _link_r (struct _reent *ptr,
  47      const char *old,
  48      const char *new)
  49 {
  50   int ret;
  51
  52   errno = 0;
  53   if ((ret = _link (old, new)) == -1 && errno != 0)
  54     _REENT_ERRNO(ptr) = errno;
  55   return ret;
  56 }
  57
  58 #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */