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편집 파일: posix.h

#ifndef RBIMPL_INTERN_SELECT_POSIX_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_INTERN_SELECT_POSIX_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(). */ #include "ruby/internal/config.h" #ifdef HAVE_SYS_SELECT_H # include <sys/select.h> /* for select(2) (modern POSIX) */ #endif #ifdef HAVE_UNISTD_H # include <unistd.h> /* for select(2) (archaic UNIX) */ #endif #include "ruby/internal/attr/const.h" #include "ruby/internal/attr/noalias.h" #include "ruby/internal/attr/nonnull.h" #include "ruby/internal/attr/pure.h" /** * The data structure which wraps the fd_set bitmap used by `select(2)`. This * allows Ruby to use FD sets larger than what has been historically allowed on * modern platforms. * * @internal * * ... but because this header file is included only when the system is with * that "historic restrictions", this is nothing more than an alias of fd_set. */ typedef fd_set rb_fdset_t; /** Clears the given ::rb_fdset_t. */ #define rb_fd_zero FD_ZERO /** Sets the given fd to the ::rb_fdset_t. */ #define rb_fd_set FD_SET /** Unsets the given fd from the ::rb_fdset_t. */ #define rb_fd_clr FD_CLR /** Queries if the given fd is in the ::rb_fdset_t. */ #define rb_fd_isset FD_ISSET /** Initialises the :given :rb_fdset_t. */ #define rb_fd_init FD_ZERO /** Waits for multiple file descriptors at once. */ #define rb_fd_select select /**@cond INTERNAL_MACRO */ #define rb_fd_copy rb_fd_copy #define rb_fd_dup rb_fd_dup #define rb_fd_ptr rb_fd_ptr #define rb_fd_max rb_fd_max /** @endcond */ RBIMPL_ATTR_NONNULL(()) RBIMPL_ATTR_NOALIAS() /** * Destructively overwrites an fdset with another. * * @param[out] dst Target fdset. * @param[in] src Source fdset. * @param[in] n Unused parameter. * @post `dst` is a copy of `src`. */ static inline void rb_fd_copy(rb_fdset_t *dst, const fd_set *src, int n) { *dst = *src; } RBIMPL_ATTR_NONNULL(()) RBIMPL_ATTR_NOALIAS() /** * Destructively overwrites an fdset with another. * * @param[out] dst Target fdset. * @param[in] src Source fdset. * @post `dst` is a copy of `src`. */ static inline void rb_fd_dup(rb_fdset_t *dst, const fd_set *src) { *dst = *src; } RBIMPL_ATTR_PURE() /* :TODO: can this function be __attribute__((returns_nonnull)) or not? */ /** * Raw pointer to `fd_set`. * * @param[in] f Target fdset. * @return Underlying fd_set. * * @internal * * Extension library must not touch raw pointers. It was a bad idea to let * them use it. */ static inline fd_set * rb_fd_ptr(rb_fdset_t *f) { return f; } RBIMPL_ATTR_CONST() /** * It seems this function has no use. Maybe just remove? * * @param[in] f A set. * @return Number of file descriptors stored. */ static inline int rb_fd_max(const rb_fdset_t *f) { return FD_SETSIZE; } /** @cond INTERNAL_MACRO */ /* :FIXME: What are these? They don't exist for sibling implementations. */ #define rb_fd_init_copy(d, s) (*(d) = *(s)) #define rb_fd_term(f) ((void)(f)) /** @endcond */ #endif /* RBIMPL_INTERN_SELECT_POSIX_H */