newlib/libc/reent/openr.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 /* Some targets provides their own versions of this 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 #ifndef REENTRANT_SYSCALLS_PROVIDED
  18
  19 /* We use the errno variable used by the system dependent layer.  */
  20 #undef errno
  21 extern int errno;
  22
  23 /*
  24 FUNCTION
  25         <<_open_r>>---Reentrant version of open
  26
  27 INDEX
  28         _open_r
  29
  30 SYNOPSIS
  31         #include <reent.h>
  32         int _open_r(struct _reent *<[ptr]>,
  33                     const char *<[file]>, int <[flags]>, int <[mode]>);
  34
  35 DESCRIPTION
  36         This is a reentrant version of <<open>>.  It
  37         takes a pointer to the global data block, which holds
  38         <<errno>>.
  39 */
  40
  41 int
  42 _open_r (struct _reent *ptr,
  43      const char *file,
  44      int flags,
  45      int mode)
  46 {
  47   int ret;
  48
  49   errno = 0;
  50   if ((ret = _open (file, flags, mode)) == -1 && errno != 0)
  51     _REENT_ERRNO(ptr) = errno;
  52   return ret;
  53 }
  54
  55
  56 #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */