newlib/libc/reent/gettimeofdayr.c

   1 /* Reentrant version of gettimeofday system call
   2    This implementation just calls the times/gettimeofday system calls.
   3    Gettimeofday may not be available on all targets.  It's presence
   4    here is dubious.  Consider it for internal use only.  */
   5
   6 #include <reent.h>
   7 #include <time.h>
   8 #include <sys/time.h>
   9 #include <sys/times.h>
  10 #include <_syslist.h>
  11
  12 /* Some targets provides their own versions of these functions.  Those
  13    targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */
  14
  15 #ifdef _REENT_ONLY
  16 #ifndef REENTRANT_SYSCALLS_PROVIDED
  17 #define REENTRANT_SYSCALLS_PROVIDED
  18 #endif
  19 #endif
  20
  21 #ifdef REENTRANT_SYSCALLS_PROVIDED
  22
  23 int _dummy_gettimeofday_syscalls = 1;
  24
  25 #else
  26
  27 /* We use the errno variable used by the system dependent layer.  */
  28 #undef errno
  29 extern int errno;
  30
  31 /*
  32 FUNCTION
  33         <<_gettimeofday_r>>---Reentrant version of gettimeofday
  34
  35 INDEX
  36         _gettimeofday_r
  37
  38 SYNOPSIS
  39         #include <reent.h>
  40         #include <time.h>
  41         int _gettimeofday_r(struct _reent *<[ptr]>,
  42                 struct timeval *<[ptimeval]>,
  43                 void *<[ptimezone]>);
  44
  45 DESCRIPTION
  46         This is a reentrant version of <<gettimeofday>>.  It
  47         takes a pointer to the global data block, which holds
  48         <<errno>>.
  49
  50         This function is only available for a few targets.
  51         Check libc.a to see if its available on yours.
  52 */
  53
  54 int
  55 _gettimeofday_r (struct _reent *ptr,
  56      struct timeval *ptimeval,
  57      void *ptimezone)
  58 {
  59   int ret;
  60
  61   errno = 0;
  62   if ((ret = _gettimeofday (ptimeval, ptimezone)) == -1 && errno != 0)
  63     _REENT_ERRNO(ptr) = errno;
  64   return ret;
  65 }
  66
  67 #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */