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Diffstat (limited to 'include/ruby/impl/intern/select/largesize.h')
| -rw-r--r-- | include/ruby/impl/intern/select/largesize.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/include/ruby/impl/intern/select/largesize.h b/include/ruby/impl/intern/select/largesize.h new file mode 100644 index 0000000000..b54ac116dd --- /dev/null +++ b/include/ruby/impl/intern/select/largesize.h @@ -0,0 +1,103 @@ +#ifndef RUBY3_INTERN_SELECT_LARGESIZE_H /*-*-C++-*-vi:se ft=cpp:*/ +#define RUBY3_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 `RUBY3` or `ruby3` 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/3/attr/nonnull.h" +#include "ruby/3/attr/pure.h" +#include "ruby/3/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; + +RUBY3_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 *); +RUBY3_SYMBOL_EXPORT_END() + +RUBY3_ATTR_NONNULL(()) +RUBY3_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; +} + +RUBY3_ATTR_NONNULL(()) +RUBY3_ATTR_PURE() +static inline int +rb_fd_max(const rb_fdset_t *f) +{ + return f->maxfd; +} + +#endif /* RUBY3_INTERN_SELECT_LARGESIZE_H */ |