newlib-cygwin/newlib/libc/reent/lseek64r.c

60 lines
1.2 KiB
C

/* Reentrant versions of lseek system call. */
#include <reent.h>
#include <unistd.h>
#include <_syslist.h>
/* Some targets provides their own versions of this functions. Those
targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */
#ifdef __LARGE64_FILES
#ifdef _REENT_ONLY
#ifndef REENTRANT_SYSCALLS_PROVIDED
#define REENTRANT_SYSCALLS_PROVIDED
#endif
#endif
#ifndef REENTRANT_SYSCALLS_PROVIDED
/* We use the errno variable used by the system dependent layer. */
#undef errno
extern int errno;
/*
FUNCTION
<<_lseek64_r>>---Reentrant version of lseek
INDEX
_lseek64_r
SYNOPSIS
#include <reent.h>
off64_t _lseek64_r(struct _reent *<[ptr]>,
int <[fd]>, off64_t <[pos]>, int <[whence]>);
DESCRIPTION
This is a reentrant version of <<lseek64>>. It
takes a pointer to the global data block, which holds
<<errno>>. This function only exists on a system
with large file support.
*/
_off64_t
_lseek64_r (struct _reent *ptr,
int fd,
_off64_t pos,
int whence)
{
_off64_t ret;
errno = 0;
if ((ret = _lseek64 (fd, pos, whence)) == (_off64_t) -1 && errno != 0)
ptr->_errno = errno;
return ret;
}
#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
#endif /* __LARGE64_FILES */