kolibrios-gitea/programs/develop/libraries/newlib/reent/gettimeofdayr.c
Sergey Semyonov (Serge) 2336060a0c newlib: update
git-svn-id: svn://kolibrios.org@1906 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-03-11 18:52:24 +00:00

114 lines
2.7 KiB
C

/* Reentrant version of gettimeofday system call
This implementation just calls the times/gettimeofday system calls.
Gettimeofday may not be available on all targets. It's presence
here is dubious. Consider it for internal use only. */
#include <reent.h>
#include <time.h>
#include <sys/time.h>
#include <sys/times.h>
#include <_syslist.h>
#include <errno.h>
/* Some targets provides their own versions of these functions. Those
targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */
#ifdef _REENT_ONLY
#ifndef REENTRANT_SYSCALLS_PROVIDED
#define REENTRANT_SYSCALLS_PROVIDED
#endif
#endif
#ifdef REENTRANT_SYSCALLS_PROVIDED
int _dummy_gettimeofday_syscalls = 1;
#else
/* We use the errno variable used by the system dependent layer. */
#undef errno
static int errno;
/*
FUNCTION
<<_gettimeofday_r>>---Reentrant version of gettimeofday
INDEX
_gettimeofday_r
ANSI_SYNOPSIS
#include <reent.h>
#include <time.h>
int _gettimeofday_r(struct _reent *<[ptr]>,
struct timeval *<[ptimeval]>,
void *<[ptimezone]>);
TRAD_SYNOPSIS
#include <reent.h>
#include <time.h>
int _gettimeofday_r(<[ptr]>, <[ptimeval]>, <[ptimezone]>)
struct _reent *<[ptr]>;
struct timeval *<[ptimeval]>;
void *<[ptimezone]>;
DESCRIPTION
This is a reentrant version of <<gettimeofday>>. It
takes a pointer to the global data block, which holds
<<errno>>.
This function is only available for a few targets.
Check libc.a to see if its available on yours.
*/
int
_DEFUN (_gettimeofday_r, (ptr, ptimeval, ptimezone),
struct _reent *ptr _AND
struct timeval *ptimeval _AND
void *ptimezone)
{
int ret;
errno = 0;
if ((ret = _gettimeofday (ptimeval, ptimezone)) == -1 && errno != 0)
ptr->_errno = errno;
return ret;
}
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
int
_gettimeofday (struct timeval *tv, void *tz)
{
unsigned int xtmp;
struct tm tmblk;
if( tv )
{
tv->tv_usec = 0;
__asm__ __volatile__("int $0x40":"=a"(xtmp):"0"(3));
tmblk.tm_sec = (xtmp>>16)&0xff;
tmblk.tm_min = (xtmp>>8)&0xff;
tmblk.tm_hour = xtmp&0xff;
BCD_TO_BIN(tmblk.tm_sec);
BCD_TO_BIN(tmblk.tm_min);
BCD_TO_BIN(tmblk.tm_hour);
__asm__ __volatile__("int $0x40":"=a"(xtmp):"0"(29));
tmblk.tm_mday = (xtmp>>16)&0xff;
tmblk.tm_mon = ((xtmp>>8)&0xff)-1;
tmblk.tm_year = ((xtmp&0xff)+2000)-1900;
tmblk.tm_wday = tmblk.tm_yday = 0;
tmblk.tm_isdst = -1;
tv->tv_sec = mktime(&tmblk);
return 0;
}
else
{
errno = EINVAL;
return -1;
};
}
#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */