Current File : //opt/alt/ruby30/include/ruby/internal/intern/select/largesize.h
#ifndef RBIMPL_INTERN_SELECT_LARGESIZE_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_INTERN_SELECT_LARGESIZE_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright 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.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Public APIs to provide ::rb_fd_select().
*
* Several Unix platforms support file descriptors bigger than FD_SETSIZE in
* `select(2)` system call.
*
* - Linux 2.2.12 (?)
*
* - NetBSD 1.2 (src/sys/kern/sys_generic.c:1.25)
* `select(2)` documents how to allocate fd_set dynamically.
* http://netbsd.gw.com/cgi-bin/man-cgi?select++NetBSD-4.0
*
* - FreeBSD 2.2 (src/sys/kern/sys_generic.c:1.19)
*
* - OpenBSD 2.0 (src/sys/kern/sys_generic.c:1.4)
* `select(2)` documents how to allocate fd_set dynamically.
* http://www.openbsd.org/cgi-bin/man.cgi?query=select&manpath=OpenBSD+4.4
*
* - HP-UX documents how to allocate fd_set dynamically.
* http://docs.hp.com/en/B2355-60105/select.2.html
*
* - Solaris 8 has `select_large_fdset`
*
* - Mac OS X 10.7 (Lion)
* `select(2)` returns `EINVAL` if `nfds` is greater than `FD_SET_SIZE` and
* `_DARWIN_UNLIMITED_SELECT` (or `_DARWIN_C_SOURCE`) isn't defined.
* http://developer.apple.com/library/mac/#releasenotes/Darwin/SymbolVariantsRelNotes/_index.html
*
* When `fd_set` is not big enough to hold big file descriptors, it should be
* allocated dynamically. Note that this assumes `fd_set` is structured as
* bitmap.
*
* `rb_fd_init` allocates the memory.
* `rb_fd_term` frees the memory.
* `rb_fd_set` may re-allocate bitmap.
*
* So `rb_fd_set` doesn't reject file descriptors bigger than `FD_SETSIZE`.
*/
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/attr/pure.h"
#include "ruby/internal/dllexport.h"
/**@cond INTERNAL_MACRO */
#define rb_fd_ptr rb_fd_ptr
#define rb_fd_max rb_fd_max
/** @endcond */
struct timeval;
typedef struct {
int maxfd;
fd_set *fdset;
} rb_fdset_t;
RBIMPL_SYMBOL_EXPORT_BEGIN()
void rb_fd_init(rb_fdset_t *);
void rb_fd_term(rb_fdset_t *);
void rb_fd_zero(rb_fdset_t *);
void rb_fd_set(int, rb_fdset_t *);
void rb_fd_clr(int, rb_fdset_t *);
int rb_fd_isset(int, const rb_fdset_t *);
void rb_fd_copy(rb_fdset_t *, const fd_set *, int);
void rb_fd_dup(rb_fdset_t *dst, const rb_fdset_t *src);
int rb_fd_select(int, rb_fdset_t *, rb_fdset_t *, rb_fdset_t *, struct timeval *);
RBIMPL_SYMBOL_EXPORT_END()
RBIMPL_ATTR_NONNULL(())
RBIMPL_ATTR_PURE()
/* :TODO: can this function be __attribute__((returns_nonnull)) or not? */
static inline fd_set *
rb_fd_ptr(const rb_fdset_t *f)
{
return f->fdset;
}
RBIMPL_ATTR_NONNULL(())
RBIMPL_ATTR_PURE()
static inline int
rb_fd_max(const rb_fdset_t *f)
{
return f->maxfd;
}
#endif /* RBIMPL_INTERN_SELECT_LARGESIZE_H */
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