mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-30 19:53:46 +00:00
64 lines
1.3 KiB
C
64 lines
1.3 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 _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
|
||
|
|
<<_lseek_r>>---Reentrant version of lseek
|
||
|
|
|
||
|
|
INDEX
|
||
|
|
_lseek_r
|
||
|
|
|
||
|
|
ANSI_SYNOPSIS
|
||
|
|
#include <reent.h>
|
||
|
|
off_t _lseek_r(struct _reent *<[ptr]>,
|
||
|
|
int <[fd]>, off_t <[pos]>, int <[whence]>);
|
||
|
|
|
||
|
|
TRAD_SYNOPSIS
|
||
|
|
#include <reent.h>
|
||
|
|
off_t _lseek_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>)
|
||
|
|
struct _reent *<[ptr]>;
|
||
|
|
int <[fd]>;
|
||
|
|
off_t <[pos]>;
|
||
|
|
int <[whence]>;
|
||
|
|
|
||
|
|
DESCRIPTION
|
||
|
|
This is a reentrant version of <<lseek>>. It
|
||
|
|
takes a pointer to the global data block, which holds
|
||
|
|
<<errno>>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
_off_t
|
||
|
|
_DEFUN (_lseek_r, (ptr, fd, pos, whence),
|
||
|
|
struct _reent *ptr _AND
|
||
|
|
int fd _AND
|
||
|
|
_off_t pos _AND
|
||
|
|
int whence)
|
||
|
|
{
|
||
|
|
_off_t ret;
|
||
|
|
|
||
|
|
errno = 0;
|
||
|
|
if ((ret = _lseek (fd, pos, whence)) == (_off_t) -1 && errno != 0)
|
||
|
|
ptr->_errno = errno;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
|