mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-22 22:56:53 +03:00
200 lines
8.9 KiB
C
200 lines
8.9 KiB
C
/* This header file provides the reentrancy. */
|
|
|
|
/* The reentrant system calls here serve two purposes:
|
|
|
|
1) Provide reentrant versions of the system calls the ANSI C library
|
|
requires.
|
|
2) Provide these system calls in a namespace clean way.
|
|
|
|
It is intended that *all* system calls that the ANSI C library needs
|
|
be declared here. It documents them all in one place. All library access
|
|
to the system is via some form of these functions.
|
|
|
|
The target may provide the needed syscalls by any of the following:
|
|
|
|
1) Define the reentrant versions of the syscalls directly.
|
|
(eg: _open_r, _close_r, etc.). Please keep the namespace clean.
|
|
When you do this, set "syscall_dir" to "syscalls" and add
|
|
-DREENTRANT_SYSCALLS_PROVIDED to newlib_cflags in configure.host.
|
|
|
|
2) Define namespace clean versions of the system calls by prefixing
|
|
them with '_' (eg: _open, _close, etc.). Technically, there won't be
|
|
true reentrancy at the syscall level, but the library will be namespace
|
|
clean.
|
|
When you do this, set "syscall_dir" to "syscalls" in configure.host.
|
|
|
|
3) Define or otherwise provide the regular versions of the syscalls
|
|
(eg: open, close, etc.). The library won't be reentrant nor namespace
|
|
clean, but at least it will work.
|
|
When you do this, add -DMISSING_SYSCALL_NAMES to newlib_cflags in
|
|
configure.host.
|
|
|
|
4) Define or otherwise provide the regular versions of the syscalls,
|
|
and do not supply functional interfaces for any of the reentrant
|
|
calls. With this method, the reentrant syscalls are redefined to
|
|
directly call the regular system call without the reentrancy argument.
|
|
When you do this, specify both -DREENTRANT_SYSCALLS_PROVIDED and
|
|
-DMISSING_SYSCALL_NAMES via newlib_cflags in configure.host and do
|
|
not specify "syscall_dir".
|
|
|
|
Stubs of the reentrant versions of the syscalls exist in the libc/reent
|
|
source directory and are provided if REENTRANT_SYSCALLS_PROVIDED isn't
|
|
defined. These stubs call the native system calls: _open, _close, etc.
|
|
if MISSING_SYSCALL_NAMES is *not* defined, otherwise they call the
|
|
non-underscored versions: open, close, etc. when MISSING_SYSCALL_NAMES
|
|
*is* defined.
|
|
|
|
By default, newlib functions call the reentrant syscalls internally,
|
|
passing a reentrancy structure as an argument. This reentrancy structure
|
|
contains data that is thread-specific. For example, the errno value is
|
|
kept in the reentrancy structure. If multiple threads exist, each will
|
|
keep a separate errno value which is intuitive since the application flow
|
|
cannot check for failure reliably otherwise.
|
|
|
|
The reentrant syscalls are either provided by the platform, by the
|
|
libc/reent stubs, or in the case of both MISSING_SYSCALL_NAMES and
|
|
REENTRANT_SYSCALLS_PROVIDED being defined, the calls are redefined to
|
|
simply call the regular syscalls with no reentrancy struct argument.
|
|
|
|
A single-threaded application does not need to worry about the reentrancy
|
|
structure. It is used internally.
|
|
|
|
A multi-threaded application needs either to manually manage reentrancy
|
|
structures or use dynamic reentrancy.
|
|
|
|
Manually managing reentrancy structures entails calling special reentrant
|
|
versions of newlib functions that have an additional reentrancy argument.
|
|
For example, _printf_r. By convention, the first argument is the
|
|
reentrancy structure. By default, the normal version of the function
|
|
uses the default reentrancy structure: _REENT. The reentrancy structure
|
|
is passed internally, eventually to the reentrant syscalls themselves.
|
|
How the structures are stored and accessed in this model is up to the
|
|
application.
|
|
|
|
Dynamic reentrancy is specified by the __DYNAMIC_REENT__ flag. This
|
|
flag denotes setting up a macro to replace _REENT with a function call
|
|
to __getreent(). This function needs to be implemented by the platform
|
|
and it is meant to return the reentrancy structure for the current
|
|
thread. When the regular C functions (e.g. printf) go to call internal
|
|
routines with the default _REENT structure, they end up calling with
|
|
the reentrancy structure for the thread. Thus, application code does not
|
|
need to call the _r routines nor worry about reentrancy structures. */
|
|
|
|
/* WARNING: All identifiers here must begin with an underscore. This file is
|
|
included by stdio.h and others and we therefore must only use identifiers
|
|
in the namespace allotted to us. */
|
|
|
|
#ifndef _REENT_H_
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#define _REENT_H_
|
|
|
|
#include <sys/reent.h>
|
|
#include <sys/_types.h>
|
|
#include <machine/types.h>
|
|
|
|
#define __need_size_t
|
|
#define __need_ptrdiff_t
|
|
#include <stddef.h>
|
|
|
|
/* FIXME: not namespace clean */
|
|
struct stat;
|
|
struct tms;
|
|
struct timeval;
|
|
struct timezone;
|
|
|
|
typedef struct
|
|
{
|
|
char *name;
|
|
unsigned int offset;
|
|
int (*write)(const char*, const void *, size_t, size_t, size_t*);
|
|
}__file_handle;
|
|
|
|
|
|
#if defined(REENTRANT_SYSCALLS_PROVIDED) && defined(MISSING_SYSCALL_NAMES)
|
|
|
|
#define _close_r(__reent, __fd) close(__fd)
|
|
#define _execve_r(__reent, __f, __arg, __env) execve(__f, __arg, __env)
|
|
#define _fcntl_r(__reent, __fd, __cmd, __arg) fcntl(__fd, __cmd, __arg)
|
|
#define _fork_r(__reent) fork()
|
|
#define _fstat_r(__reent, __fdes, __stat) fstat(__fdes, __stat)
|
|
#define _getpid_r(__reent) getpid()
|
|
#define _isatty_r(__reent, __desc) isatty(__desc)
|
|
#define _kill_r(__reent, __pid, __signal) kill(__pid, __signal)
|
|
#define _link_r(__reent, __oldpath, __newpath) link(__oldpath, __newpath)
|
|
#define _lseek_r(__reent, __fdes, __off, __w) lseek(__fdes, __off, __w)
|
|
#define _mkdir_r(__reent, __path, __m) mkdir(__path, __m)
|
|
#define _open_r(__reent, __path, __flag, __m) open(__path, __flag, __m)
|
|
#define _read_r(__reent, __fd, __buff, __cnt) read(__fd, __buff, __cnt)
|
|
#define _rename_r(__reent, __old, __new) rename(__old, __new)
|
|
#define _sbrk_r(__reent, __incr) sbrk(__incr)
|
|
#define _stat_r(__reent, __path, __buff) stat(__path, __buff)
|
|
#define _times_r(__reent, __time) times(__time)
|
|
#define _unlink_r(__reent, __path) unlink(__path)
|
|
#define _wait_r(__reent, __status) wait(__status)
|
|
#define _write_r(__reent, __fd, __buff, __cnt) write(__fd, __buff, __cnt)
|
|
#define _gettimeofday_r(__reent, __tp, __tzp) gettimeofday(__tp, __tzp)
|
|
|
|
#ifdef __LARGE64_FILES
|
|
#define _lseek64_r(__reent, __fd, __off, __w) lseek64(__fd, __off, __w)
|
|
#define _fstat64_r(__reent, __fd, __buff) fstat64(__fd, __buff)
|
|
#define _open64_r(__reent, __path, __flag, __m) open64(__path, __flag, __m)
|
|
#endif
|
|
|
|
#else
|
|
/* Reentrant versions of system calls. */
|
|
|
|
extern int _close_r _PARAMS ((struct _reent *, int));
|
|
extern int _execve_r _PARAMS ((struct _reent *, const char *, char *const *, char *const *));
|
|
extern int _fcntl_r _PARAMS ((struct _reent *, int, int, int));
|
|
extern int _fork_r _PARAMS ((struct _reent *));
|
|
extern int _fstat_r _PARAMS ((struct _reent *, int, struct stat *));
|
|
static inline int _getpid_r (struct _reent *r)
|
|
{
|
|
int pid;
|
|
(void)r;
|
|
__asm__ __volatile__(
|
|
"movl %%fs:0, %0 \n\t"
|
|
:"=r"(pid));
|
|
return pid;
|
|
}
|
|
extern int _isatty_r _PARAMS ((struct _reent *, int));
|
|
extern int _kill_r _PARAMS ((struct _reent *, int, int));
|
|
extern int _link_r _PARAMS ((struct _reent *, const char *, const char *));
|
|
extern _off_t _lseek_r _PARAMS ((struct _reent *, int, _off_t, int));
|
|
extern int _mkdir_r _PARAMS ((struct _reent *, const char *, int));
|
|
extern int _open_r _PARAMS ((struct _reent *, const char *, int, int));
|
|
extern _ssize_t _read_r _PARAMS ((struct _reent *, int, void *, size_t));
|
|
extern int _rename_r _PARAMS ((struct _reent *, const char *, const char *));
|
|
extern void *_sbrk_r _PARAMS ((struct _reent *, ptrdiff_t));
|
|
extern int _stat_r _PARAMS ((struct _reent *, const char *, struct stat *));
|
|
extern _CLOCK_T_ _times_r _PARAMS ((struct _reent *, struct tms *));
|
|
extern int _unlink_r _PARAMS ((struct _reent *, const char *));
|
|
extern int _wait_r _PARAMS ((struct _reent *, int *));
|
|
extern _ssize_t _write_r _PARAMS ((struct _reent *, int, const void *, size_t));
|
|
|
|
/* This one is not guaranteed to be available on all targets. */
|
|
extern int _gettimeofday_r _PARAMS ((struct _reent *, struct timeval *__tp, void *__tzp));
|
|
|
|
#ifdef __LARGE64_FILES
|
|
|
|
#if defined(__CYGWIN__) && defined(_COMPILING_NEWLIB)
|
|
#define stat64 __stat64
|
|
#endif
|
|
|
|
struct stat64;
|
|
|
|
extern _off64_t _lseek64_r _PARAMS ((struct _reent *, int, _off64_t, int));
|
|
extern int _fstat64_r _PARAMS ((struct _reent *, int, struct stat64 *));
|
|
extern int _open64_r _PARAMS ((struct _reent *, const char *, int, int));
|
|
extern int _stat64_r _PARAMS ((struct _reent *, const char *, struct stat64 *));
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* _REENT_H_ */
|