(892c46283a5ea4179500d951c9d4866c0051f27b)

#include "ruby/internal/config.h"
#include <stdarg.h>
#include "defines.h"
#include "ruby/internal/abi.h"
#include "ruby/internal/anyargs.h"
#include "ruby/internal/arithmetic.h"
#include "ruby/internal/core.h"
#include "ruby/internal/ctype.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/error.h"
#include "ruby/internal/eval.h"
#include "ruby/internal/event.h"
#include "ruby/internal/fl_type.h"
#include "ruby/internal/gc.h"
#include "ruby/internal/glob.h"
#include "ruby/internal/globals.h"
#include "ruby/internal/has/warning.h"
#include "ruby/internal/interpreter.h"
#include "ruby/internal/iterator.h"
#include "ruby/internal/memory.h"
#include "ruby/internal/method.h"
#include "ruby/internal/module.h"
#include "ruby/internal/newobj.h"
#include "ruby/internal/scan_args.h"
#include "ruby/internal/special_consts.h"
#include "ruby/internal/symbol.h"
#include "ruby/internal/value.h"
#include "ruby/internal/value_type.h"
#include "ruby/internal/variable.h"
#include "ruby/assert.h"
#include "ruby/backward/2/assume.h"
#include "ruby/backward/2/inttypes.h"
#include "ruby/backward/2/limits.h"
#include "ruby/intern.h"
#include <errno.h>
#include "ruby/subst.h"
#include "ruby/backward.h"

Include dependency graph for ruby.h:

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Go to the source code of this file.

Macros
#define	USE_SYMBOL_AS_METHOD_NAME 1

#define	FilePathValue(v) (RB_GC_GUARD(v) = rb_get_path(v))
	Ensures that the parameter object is a path. More...

#define	FilePathStringValue(v) ((v) = rb_get_path(v))
	This macro actually does the same thing as FilePathValue now. More...

#define	RUBY_VM 1 /* YARV */

#define	HAVE_NATIVETHREAD

#define	InitVM(ext) {void InitVM_##ext(void);InitVM_##ext();}
	This macro is for internal use. More...

Functions
VALUE	rb_get_path (VALUE obj)
	Converts an object to a path. More...

VALUE	rb_get_path_no_checksafe (VALUE)

const char *	rb_class2name (VALUE klass)
	Queries the name of the passed class. More...

const char *	rb_obj_classname (VALUE obj)
	Queries the name of the class of the passed object. More...

void	rb_p (VALUE obj)
	Inspects an object. More...

VALUE	rb_equal (VALUE lhs, VALUE rhs)
	This function is an optimised version of calling `#==`. More...

VALUE	rb_require (const char *feature)
	Identical to rb_require_string(), except it takes C's string instead of Ruby's. More...

int	ruby_native_thread_p (void)
	Queries if the thread which calls this function is a ruby's thread. More...

int	ruby_snprintf (char str, size_t n, char const fmt,...)
	Our own locale-insensitive version of `snprintf(3)`. More...

int	ruby_vsnprintf (char str, size_t n, char const fmt, va_list ap)
	Identical to ruby_snprintf(), except it takes a `va_list`. More...

Errno handling routines for userland threads
Note POSIX chapter 2 section 3 states that for each thread of a process, the value of `errno` shall not be affected by function calls or assignments to `errno` by other threads. Soooo this `#define errno` below seems like a noob mistake at first sight. If you look at its actual implementation, the functions are just adding one level of indirection. It doesn't make any sense sorry? But yes! @ko1 told @shyouhei that this is inevitable. The ultimate reason is because Ruby now has N:M threads implemented. Threads of that sort change their context in user land. A function can be "transferred" between threads in middle of their executions. Let us for instance consider: void foo() { auto i = errno; close(0); errno = i; } errno #define errno Ractor-aware version of errno. Definition: ruby.h:388 This function (if ran under our Ractor) could change its running thread at the `close` function. But the two `errno` invocations are different! Look how the source code above is compiled by clang 17 with `-O3` flag @ Linux: foo(int): # @foo(int) push rbp push r14 push rbx mov ebx, edi call __errno_location@PLT mov r14, rax mov ebp, dword ptr [rax] mov edi, ebx call close@PLT mov dword ptr [r14], ebp pop rbx pop r14 pop rbp ret ptr char * ptr Pointer to the underlying memory region, of at least capa bytes. Definition: io.h:2 Notice how `__errno_location@PLT` is `call`-ed only once. The compiler assumes that the location of `errno` does not change during a function call. Sadly this is no longer true for us. The `close@PLT` now changes threads, which should also change where `errno` is stored. With the `#define errno` below the compilation result changes to this: foo(int): # @foo(int) push rbp push rbx push rax mov ebx, edi call rb_errno_ptr()@PLT mov ebp, dword ptr [rax] mov edi, ebx call close@PLT call rb_errno_ptr()@PLT mov dword ptr [rax], ebp add rsp, 8 pop rbx pop rbp ret rb_errno_ptr int * rb_errno_ptr(void) The location of errno Definition: eval.c:2161 Which fixes the problem.
#define	rb_orig_errno errno
	System-provided original `errno`. More...

#define	errno (*rb_errno_ptr())
	Ractor-aware version of `errno`. More...

int	rb_errno (void)
	Identical to system `errno`. More...

void	rb_errno_set (int err)
	Set the errno. More...

int *	rb_errno_ptr (void)
	The location of `errno` More...

static int *	rb_orig_errno_ptr (void)
	Not sure if it is necessary for extension libraries but this is where the "bare" errno is located. More...

Detailed Description

Author: $Author$

Date: Thu Jun 10 14:26:32 JST 1993

Copyright: Copyright (C) 1993-2008 Yukihiro Matsumoto; Copyright (C) 2000 Network Applied Communication Laboratory, Inc.; Copyright (C) 2000 Information-technology Promotion Agency, Japan; This file is a part of the programming language Ruby. Permission is hereby granted, to either redistribute and/or modify this file, provided that the conditions mentioned in the file COPYING are met. Consult the file for details.

Definition in file ruby.h.

Macro Definition Documentation

◆ errno

#define errno (*rb_errno_ptr())

Ractor-aware version of errno.

Definition at line 388 of file ruby.h.

◆ FilePathStringValue

#define FilePathStringValue ( v ) ((v) = rb_get_path(v))

This macro actually does the same thing as FilePathValue now.

The "String" part indicates that this is for when a string is treated like a pathname, rather than the actual pathname on the file systems. For examples: Dir.fnmatch?, File.join, File.basename, etc.

Definition at line 105 of file ruby.h.

◆ FilePathValue

#define FilePathValue ( v ) (RB_GC_GUARD(v) = rb_get_path(v))

Ensures that the parameter object is a path.

Parameters

[in,out] v Arbitrary ruby object.

Exceptions

rb_eArgError	`v` contains a NUL byte.
rb_eTypeError	`v` is not path-ish.
rb_eEncCompatError	`v` is not path-compatible.

Postcondition: v is a path.

Definition at line 90 of file ruby.h.

◆ HAVE_NATIVETHREAD

#define HAVE_NATIVETHREAD

Deprecated:: This macro once was a thing in the old days, but makes no sense any longer today.

Exists here for backwards compatibility only. You can safely forget about it.

Definition at line 212 of file ruby.h.

◆ InitVM

#define InitVM ( ext ) {void InitVM_##ext(void);InitVM_##ext();}

This macro is for internal use.

Must be a mistake to place here.

Definition at line 231 of file ruby.h.

◆ rb_orig_errno

#define rb_orig_errno errno

System-provided original errno.

Definition at line 386 of file ruby.h.

◆ RUBY_VM

#define RUBY_VM 1 /* YARV */

Deprecated:: This macro once was a thing in the old days, but makes no sense any longer today.

Exists here for backwards compatibility only. You can safely forget about it.

Definition at line 203 of file ruby.h.

◆ USE_SYMBOL_AS_METHOD_NAME

#define USE_SYMBOL_AS_METHOD_NAME 1

Deprecated:: This macro once was a thing in the old days, but makes no sense any longer today.

Exists here for backwards compatibility only. You can safely forget about it.

Definition at line 67 of file ruby.h.

Function Documentation

◆ rb_class2name()

const char* rb_class2name ( VALUE klass )

Queries the name of the passed class.

Parameters

[in] klass An instance of a class.

Returns: The name of klass.

Note: Return value is managed by our GC. Don't free.

Definition at line 418 of file variable.c.

Referenced by rb_obj_classname(), and rb_profile_frame_classpath().

◆ rb_errno()

int rb_errno ( void )

Identical to system errno.

Returns: The last set errno number.

Definition at line 2149 of file eval.c.

Referenced by rb_nogvl().

◆ rb_errno_ptr()

int* rb_errno_ptr ( void )

The location of errno

Returns: The (thread-specific) location of errno.

Definition at line 2161 of file eval.c.

◆ rb_errno_set()

void rb_errno_set ( int err )

Set the errno.

Parameters

err	New `errno`.

Postcondition: errno is now set to err.

Definition at line 2155 of file eval.c.

Referenced by rb_nogvl().

◆ rb_get_path()

VALUE rb_get_path ( VALUE obj )

Converts an object to a path.

It first tries #to_path method if any, then falls back to #to_str method.

Parameters

[in] obj Arbitrary ruby object.

Exceptions

rb_eArgError	`obj` contains a NUL byte.
rb_eTypeError	`obj` is not path-ish.
rb_eEncCompatError	No encoding conversion from `obj` to path.

Returns: Converted path object.

Definition at line 246 of file file.c.

Referenced by rb_find_file(), rb_find_file_ext(), and rb_get_path_no_checksafe().

◆ rb_get_path_no_checksafe()

VALUE rb_get_path_no_checksafe ( VALUE obj )

Deprecated:: This function is an alias of rb_get_path() now.

The part that did "no_checksafe" was deleted. It remains here because of no harm.

Definition at line 240 of file file.c.

◆ rb_obj_classname()

const char* rb_obj_classname ( VALUE obj )

Queries the name of the class of the passed object.

Parameters

[in] obj Arbitrary ruby object.

Returns: The name of the class of obj.

Note: Return value is managed by our GC. Don't free.

Definition at line 427 of file variable.c.

Referenced by rb_Hash().

◆ rb_orig_errno_ptr()

static int* rb_orig_errno_ptr ( void )

inlinestatic

Not sure if it is necessary for extension libraries but this is where the "bare" errno is located.

Returns: The location of errno.

Definition at line 381 of file ruby.h.

Referenced by rb_errno(), rb_errno_ptr(), and rb_errno_set().

◆ rb_p()

void rb_p ( VALUE obj )

Inspects an object.

It first calls the argument's #inspect method, then feeds its result string into rb_stdout.

This is identical to Ruby level Kernel#p, except it takes only one object.

Definition at line 9000 of file io.c.

◆ rb_require()

VALUE rb_require ( const char * feature )

Identical to rb_require_string(), except it takes C's string instead of Ruby's.

Parameters

[in] feature Name of a feature, e.g. "json".

Exceptions

rb_eLoadError	No such feature.
rb_eRuntimeError	`$"` is frozen; unable to push.

Return values

RUBY_Qtrue	The feature is loaded for the first time.
RUBY_Qfalse	The feature has already been loaded.

Postcondition: $" is updated.

Definition at line 1416 of file load.c.

◆ ruby_native_thread_p()

int ruby_native_thread_p ( void )

Queries if the thread which calls this function is a ruby's thread.

"Ruby's" in this context is a thread created using one of our APIs like rb_thread_create(). There are distinctions between ruby's and other threads. For instance calling ruby methods are allowed only from inside of a ruby's thread.

Return values

1	The current thread is a Ruby's thread.
0	The current thread is a random thread from outside of Ruby.

Definition at line 5542 of file thread.c.

◆ ruby_snprintf()

int ruby_snprintf	(	char *	str,
		size_t	n,
		char const *	fmt,
			...
	)

Our own locale-insensitive version of snprintf(3).

It can also be seen as a routine identical to rb_sprintf(), except it writes back to the passed buffer instead of allocating a new Ruby object.

Parameters

[out]	str	Return buffer
[in]	n	Number of bytes of `str`.
[in]	fmt	A `printf`-like format specifier.
[in]	...	Variadic number of contents to format.

Returns: Number of bytes that would have been written to str, if n was large enough. Comparing this to n can give you insights that the buffer is too small or too big. Especially passing 0 to n gives you the exact number of bytes necessary to hold the result string without writing anything to anywhere.

Postcondition: str holds up to n-1 bytes of formatted contents (and the terminating NUL character.)

Definition at line 1041 of file sprintf.c.

◆ ruby_vsnprintf()

int ruby_vsnprintf	(	char *	str,
		size_t	n,
		char const *	fmt,
		va_list	ap
	)

Identical to ruby_snprintf(), except it takes a va_list.

It can also be seen as a routine identical to rb_vsprintf(), except it writes back to the passed buffer instead of allocating a new Ruby object.

Parameters

[out]	str	Return buffer
[in]	n	Number of bytes of `str`.
[in]	fmt	A `printf`-like format specifier.
[in]	ap	Contents to format.

Returns: Number of bytes that would have been written to str, if n was large enough. Comparing this to n can give you insights that the buffer is too small or too big. Especially passing 0 to n gives you the exact number of bytes necessary to hold the result string without writing anything to anywhere.

Postcondition: str holds up to n-1 bytes of formatted contents (and the terminating NUL character.)

Definition at line 1014 of file sprintf.c.

(892c46283a5ea4179500d951c9d4866c0051f27b)

Macros

Functions

Errno handling routines for userland threads

Detailed Description

Macro Definition Documentation

◆ errno

◆ FilePathStringValue

◆ FilePathValue

◆ HAVE_NATIVETHREAD

◆ InitVM

◆ rb_orig_errno

◆ RUBY_VM

◆ USE_SYMBOL_AS_METHOD_NAME

Function Documentation

◆ rb_class2name()

◆ rb_errno()

◆ rb_errno_ptr()

◆ rb_errno_set()

◆ rb_get_path()

◆ rb_get_path_no_checksafe()

◆ rb_obj_classname()

◆ rb_orig_errno_ptr()

◆ rb_p()

◆ rb_require()

◆ ruby_native_thread_p()

◆ ruby_snprintf()

◆ ruby_vsnprintf()