newlib/libc/reent/open64r.c

   1 /* Reentrant versions of open system call. */
   2
   3 #include <reent.h>
   4 #include <unistd.h>
   5 #include <fcntl.h>
   6 #include <_syslist.h>
   7
   8 #ifdef __LARGE64_FILES
   9
  10 /* Some targets provides their own versions of this functions.  Those
  11    targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
  12
  13 #ifdef _REENT_ONLY
  14 #ifndef REENTRANT_SYSCALLS_PROVIDED
  15 #define REENTRANT_SYSCALLS_PROVIDED
  16 #endif
  17 #endif
  18
  19 #ifndef REENTRANT_SYSCALLS_PROVIDED
  20
  21 /* We use the errno variable used by the system dependent layer.  */
  22 #undef errno
  23 extern int errno;
  24
  25 /*
  26 FUNCTION
  27         <<_open64_r>>---Reentrant version of open64
  28
  29 INDEX
  30         _open64_r
  31
  32 SYNOPSIS
  33         #include <reent.h>
  34         int _open64_r(struct _reent *<[ptr]>,
  35                       const char *<[file]>, int <[flags]>, int <[mode]>);
  36
  37 DESCRIPTION
  38         This is a reentrant version of <<open64>>.  It
  39         takes a pointer to the global data block, which holds
  40         <<errno>>.  This function only exists on systems with
  41         large file support.
  42 */
  43
  44 int
  45 _open64_r (ptr, file, flags, mode)
  46      struct _reent *ptr;
  47      const char *file;
  48      int flags;
  49      int mode;
  50 {
  51   int ret;
  52
  53   errno = 0;
  54   if ((ret = _open64 (file, flags, mode)) == -1 && errno != 0)
  55     _REENT_ERRNO(ptr) = errno;
  56   return ret;
  57 }
  58
  59 #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
  60
  61 #endif /* __LARGE64_FILES */