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

69 lines
1.4 KiB
C

#ifdef __LARGE64_FILES
/* 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 _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
ANSI_SYNOPSIS
#include <reent.h>
off64_t _lseek64_r(struct _reent *<[ptr]>,
int <[fd]>, off64_t <[pos]>, int <[whence]>);
TRAD_SYNOPSIS
#include <reent.h>
off64_t _lseek64_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>)
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 (ptr, fd, pos, whence)
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 */