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#ifndef RBIMPL_INTERN_IO_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_INTERN_IO_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 related to ::rb_cIO. */ #include "ruby/internal/dllexport.h" #include "ruby/internal/value.h" RBIMPL_SYMBOL_EXPORT_BEGIN() /* io.c */ /** * @private * * @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. */ #define rb_defout rb_stdout /* string.c */ /* ...why? moved in commit de7161526014b781468cea5d84411e23be */ /** * The field separator character for inputs, or the `$;`. This affects how * `String#split` works. You can set this via the `-F` command line option. * You can also assign arbitrary ruby objects programmatically, but it makes * best sense for you to assign a regular expression here. * * @internal * * Tidbit: "fs" comes from AWK's `FS` variable. */ RUBY_EXTERN VALUE rb_fs; /* io.c */ /* ...why? given rb_fs is in string.c? */ /** * The field separator character for outputs, or the `$,`. This affects how * `Array#join` works. * * @deprecated Assigning anything other than ::RUBY_Qnil to this variable is * deprecated. */ RUBY_EXTERN VALUE rb_output_fs; /** * The record separator character for inputs, or the `$/`. This affects how * `IO#gets` works. You can set this via the `-0` command line option. * * @deprecated Assigning anything other than ::RUBY_Qnil to this variable is * deprecated. * * @internal * * Tidbit: "rs" comes from AWK's `RS` variable. */ RUBY_EXTERN VALUE rb_rs; /** * This is the default value of ::rb_rs, i.e. `"\n"`. It seems it has always * been just a newline string since the beginning. Not sure why C codes has to * use this, given there is no way for ruby programs to interface. * * Also it has not been deprecated for unknown reasons. */ RUBY_EXTERN VALUE rb_default_rs; /** * The record separator character for outputs, or the `$\`. This affects how * `IO#print` works. * * @deprecated Assigning anything other than ::RUBY_Qnil to this variable is * deprecated. */ RUBY_EXTERN VALUE rb_output_rs; /** * Writes the given string to the given IO. * * @param[out] io An IO, opened for writing. * @param[in] str A String-like object to write to `io`. * @exception rb_eIOError `io` isn't opened for writing. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `str` to String. * @exception rb_eSystemCallError `write(2)` failed for some reason. * @return The number of bytes written to the `io`. * @post `str` (up to the length of return value) is written to `io`. * @note This function blocks. * @note Partial write is a thing. It must be at least questionable not * to check the return value. * * @internal * * Above description is in fact inaccurate. This function can take arbitrary * objects, and calls their `write` method. What is written above in fact * describes how `IO#write` works. You can pass StringIO etc. here, and would * work completely differently. */ VALUE rb_io_write(VALUE io, VALUE str); /** * Reads a "line" from the given IO. A line here means a chunk of characters * which is terminated by either `"\n"` or an EOF. * * @param[in,out] io An IO, opened for reading. * @exception rb_eIOError `io` isn't opened for reading. * @exception rb_eFrozenError `io` is frozen. * @retval RUBY_Qnil `io` is at EOF. * @retval otherwise An instance of ::rb_cString. * @post `io` is read. * @note Unlike `IO#gets` it doesn't set `$_`. * @note Unlike `IO#gets` it doesn't consider `$/`. */ VALUE rb_io_gets(VALUE io); /** * Reads a byte from the given IO. * * @note In Ruby a "byte" always means an 8 bit integer ranging from * 0 to 255 inclusive. * @param[in,out] io An IO, opened for reading. * @exception rb_eIOError `io` is not opened for reading. * @exception rb_eFrozenError `io` is frozen. * @retval RUBY_Qnil `io` is at EOF. * @retval otherwise An instance of ::rb_cInteger. * @post `io` is read. * * @internal * * Of course there was a function called `rb_io_getc()`. It was removed in * commit a25fbe3b3e531bbe479f344af24eaf9d2eeae6ea. */ VALUE rb_io_getbyte(VALUE io); /** * "Unget"s a string. This function pushes back the passed string onto the * passed IO, such that a subsequent buffered read will return it. If the * passed content is in fact an integer, a single character string of that * codepoint of the encoding of the IO will be pushed back instead. * * It might be counter-intuitive but this function can push back multiple * characters at once. Also this function can be called multiple times on a * same IO. Also a "character" can be wider than a byte, depending on the * encoding of the IO. * * @param[out] io An IO, opened for reading. * @param[in] c Either a String, or an Integer. * @exception rb_eIOError `io` is not opened for reading. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `c` to ::rb_cString. * @return Always returns ::RUBY_Qnil. * * @internal * * Why there is ungetc, given there is no getc? */ VALUE rb_io_ungetc(VALUE io, VALUE c); /** * Identical to rb_io_ungetc(), except it doesn't take the encoding of the * passed IO into account. When an integer is passed, it just casts that value * to C's `unsigned char`, and pushes that back. * * @param[out] io An IO, opened for reading. * @param[in] b Either a String, or an Integer. * @exception rb_eIOError `io` is not opened for reading. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `b` to ::rb_cString. * @return Always returns ::RUBY_Qnil. */ VALUE rb_io_ungetbyte(VALUE io, VALUE b); /** * Closes the IO. Any buffered contents are flushed to the operating system. * Any future operations against the IO would raise ::rb_eIOError. In case the * io was created using `IO.popen`, it also sets the `$?`. * * @param[out] io Target IO to close. * @return Always returns ::RUBY_Qnil. * @post `$?` is set in case IO is a pipe. * @post No operations are possible against `io` any further. * @note This can block to flush the contents. * @note This can wake other threads up, especially those who are * `select()`-ing the passed IO. * @note Multiple invocations of this function over the same IO again * and again is not an error, since Ruby 2.3. * * @internal * * You can close a frozen IO... Is this intentional? */ VALUE rb_io_close(VALUE io); /** * Flushes any buffered data within the passed IO to the underlying operating * system. * * @param[out] io Target IO to flush. * @exception rb_eIOError `io` is closed. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eSystemCallError `write(2)` failed for some reason. * @return The passed `io`. * @post `io`'s buffers are empty. * @note This operation also discards the read buffer. Should basically * be harmless, but in an esoteric situation like when user pushed * something different from what was read using `ungetc`, this * operation in fact changes the behaviour of the `io`. * @note Buffering is difficult. This operation flushes the data from * our userspace to the kernel, but that doesn't always mean you * can expect them stored persistently onto your hard drive. */ VALUE rb_io_flush(VALUE io); /** * Queries if the passed IO is at the end of file. "The end of file" here mans * that there are no more data to read. This function blocks until the read * buffer is filled in, and if that operation reached the end of file, it still * returns ::RUBY_Qfalse (because there are data yet in that buffer). It * returns ::RUBY_Qtrue once after the buffer is cleared. * * @param[in,out] io Target io to query. * @exception rb_eIOError `io` is not opened for reading. * @exception rb_eFrozenError `io` is frozen. * @retval RUBY_Qfalse There are things yet to be read. * @retval RUBY_Qtrue "The end of file" situation. */ VALUE rb_io_eof(VALUE io); /** * Sets the binmode. This operation nullifies the effect of textmode (newline * conversion from `"\r\n"` to `"\n"` or vice versa). Note that it doesn't * stop character encodings conversions. For instance an IO created using: * * ```ruby * File.open( * "/dev/urandom", * textmode: true, * external_encoding: Encoding::GB18030, * internal_encoding: Encoding::Windows_31J) * ``` * * has both newline and character conversions. If you pass such IO to this * function, only the `textmode:true` part is cancelled. Texts read through * the IO would still be encoded in Windows-31J; texts written to the IO will * be encoded in GB18030. * * @param[out] io Target IO to modify. * @exception rb_eFrozenError `io` is frozen. * @return The passed `io`. * @post `io` is in binmode. * @note There is no equivalent operation in Ruby. You can do this only * in C. */ VALUE rb_io_binmode(VALUE io); /** * Forces no conversions be applied to the passed IO. Unlike rb_io_binmode(), * this cancels any newline conversions as well as encoding conversions. Any * texts read/written through the IO will be the verbatim binary contents. * * @param[out] io Target IO to modify. * @exception rb_eFrozenError `io` is frozen. * @return The passed `io`. * @post `io` is in binmode. Both external/internal encoding are set to * rb_ascii8bit_encoding(). * @note This is the implementation of `IO#binmode`. */ VALUE rb_io_ascii8bit_binmode(VALUE io); /** * Identical to rb_io_write(), except it always returns the passed IO. * * @param[out] io An IO, opened for writing. * @param[in] str A String-like object to write to `io`. * @exception rb_eIOError `io` isn't opened for writing. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `str` to String. * @exception rb_eSystemCallError `write(2)` failed. * @return The passed `io`. * @post `str` is written to `io`. * @note This function blocks. * * @internal * * As rb_io_write(), above description is a fake. */ VALUE rb_io_addstr(VALUE io, VALUE str); /** * This is a rb_f_sprintf() + rb_io_write() combo. * * @param[in] argc Number of objects of `argv`. * @param[in] argv A format string followed by its arguments. * @param[out] io An IO, opened for writing. * @exception rb_eIOError `io` isn't opened for writing. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `str` to String. * @exception rb_eSystemCallError `write(2)` failed. * @return Always returns ::RUBY_Qnil. * @post `argv` is formatted, then written to `io`. * @note This function blocks. * * @internal * * As rb_io_write(), above descriptions include fakes. */ VALUE rb_io_printf(int argc, const VALUE *argv, VALUE io); /** * Iterates over the passed array to apply rb_io_write() individually. If * there is `$,`, this function inserts the string in middle of each * iterations. If there is `$\`, this function appends the string at the end. * If the array is empty, this function outputs `$_`. * * @param[in] argc Number of objects of `argv`. * @param[in] argv An array of strings to display. * @param[out] io An IO, opened for writing. * @exception rb_eIOError `io` isn't opened for writing. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `str` to String. * @exception rb_eSystemCallError `write(2)` failed. * @return Always returns ::RUBY_Qnil. * @post `argv` is written to `io`. * @note This function blocks. * @note This function calls rb_io_write() multiple times. Which means, * it is not an atomic operation. Outputs from multiple threads * can interleave. * * @internal * * As rb_io_write(), above descriptions include fakes. */ VALUE rb_io_print(int argc, const VALUE *argv, VALUE io); /** * Iterates over the passed array to apply rb_io_write() individually. Unlike * rb_io_print(), this function prints a newline per each element. It also * flattens the passed array (OTOH rb_io_print() just resorts to * rb_ary_to_s()). * * @param[in] argc Number of objects of `argv`. * @param[in] argv An array of strings to display. * @param[out] io An IO, opened for writing. * @exception rb_eIOError `io` isn't opened for writing. * @exception rb_eFrozenError `io` is frozen. * @exception rb_eTypeError No conversion from `str` to String. * @exception rb_eSystemCallError `write(2)` failed. * @return Always returns ::RUBY_Qnil. * @post `argv` is written to `io`. * @note This function blocks. * @note This function calls rb_io_write() multiple times. Which means, * it is not an atomic operation. Outputs from multiple threads * can interleave. * * @internal * * As rb_io_write(), above descriptions include fakes. */ VALUE rb_io_puts(int argc, const VALUE *argv, VALUE io); /** * Creates an IO instance whose backend is the given file descriptor. C * extension libraries sometimes have file descriptors created elsewhere (maybe * deep inside of another shared library), which they want ruby programs to * handle. This function is handy for such situations. * * @param[in] fd Target file descriptor. * @param[in] flags Flags, e.g. `O_CREAT|O_EXCL` * @param[in] path The path of the file that backs `fd`, for diagnostics. * @return An allocated instance of ::rb_cIO. * @note Leave `path` NULL if you don't know. */ VALUE rb_io_fdopen(int fd, int flags, const char *path); RBIMPL_ATTR_NONNULL(()) /** * Opens a file located at the given path. * * `fmode` is a C string that represents the open mode. It can be one of: * * - `r` (means `O_RDONLY`), * - `w` (means `O_WRONLY | O_TRUNC | O_CREAT`), * - `a` (means `O_WRONLY | O_APPEND | O_CREAT`), * * Followed by zero or more combinations of: * * - `b` (means `_O_BINARY`), * - `t` (means `_O_TEXT`), * - `+` (means `O_RDWR`), * - `x` (means `O_TRUNC`), or * - `:[BOM|]enc[:enc]` (see below). * * This last one specifies external (and internal if any) encodings, * respectively. If optional `BOM|` is specified and the specified external * encoding is capable of expressing BOMs, opening file's contents' byte order * is auto-detected using the mechanism. * * So for instance, fmode of `"rt|BOM:utf-16le:utf-8"` specifies that... * * - the physical representation of the contents of the file is in UTF-16; * - honours its BOM but assumes little endian if absent; * - opens the file for reading; * - what is read is converted into UTF-8; * - with newlines cannibalised to `\n`. * * @param[in] fname Path to open. * @param[in] fmode Mode specifier much like `fopen(3)`. * @exception rb_eArgError `fmode` contradicted (e.g. `"bt"`). * @exception rb_eSystemCallError `open(2)` failed for some reason. * @return An instance of ::rb_cIO. */ VALUE rb_file_open(const char *fname, const char *fmode); RBIMPL_ATTR_NONNULL(()) /** * Identical to rb_file_open(), except it takes the pathname as a Ruby's string * instead of C's. In case the passed Ruby object is a non-String it tries to * call `#to_path`. * * @param[in] fname Path to open. * @param[in] fmode Mode specifier much like `fopen(3)`. * @exception rb_eTypeError `fname` is not a String. * @exception rb_eEncCompatError `fname` is not ASCII-compatible. * @exception rb_eArgError `fmode` contradicted (e.g. `"bt"`). * @exception rb_eSystemCallError `open(2)` failed for some reason. * @return An instance of ::rb_cIO. */ VALUE rb_file_open_str(VALUE fname, const char *fmode); /** * Much like rb_io_gets(), but it reads from the mysterious ARGF object. ARGF * in this context can be seen as a virtual IO which concatenates contents of * the files passed to the process via the ARGV, or just STDIN if there are no * such files. * * Unlike rb_io_gets() this function sets `$_`. * * @exception rb_eFrozenError ARGF resorts to STDIN but it is frozen. * @retval RUBY_Qnil ARGF is at EOF. * @retval otherwise An instance of ::rb_cString. * @post ARGF is read. * @post `$_` is set. * * @internal * * In reality, this function can call `ARGF.gets`. Its redefinition can affect * the behaviour. * * Also, you can tamper ARGV on-the-fly in middle of ARGF usages: * * ``` * gets # Reads the first file. * ARGV << '/proc/self/limits' # Adds a file. * gets # Can read from /proc/self/limits. * ``` */ VALUE rb_gets(void); RBIMPL_ATTR_NONNULL(()) /** * Writes the given error message to somewhere applicable. On Windows it goes * to the console. On POSIX environments it goes to the standard error. * * @warning IT IS A BAD IDEA to use this function form your C extensions. * It is often annoying when GUI applications write to consoles; * users don't want to look at there. Programmers also want to * control the cause of the message itself, like by rescuing an * exception. Just let ruby handle errors. That must be better than * going your own way. * * @param[in] str Error message to display. * @post `str` is written to somewhere. * * @internal * * AFAIK this function is listed here without marked deprecated because there * are usages of this function in the wild. */ void rb_write_error(const char *str); /** * Identical to rb_write_error(), except it additionally takes the message's * length. Necessary when you want to handle wide characters. * * @param[in] str Error message to display. * @param[in] len Length of `str`, in bytes. * @post `str` is written to somewhere. */ void rb_write_error2(const char *str, long len); /** * Closes everything. In case of POSIX environments, a child process inherits * its parent's opened file descriptors. Which is nowadays considered as one * of the UNIX mistakes. This function closes such inherited file descriptors. * When your C extension needs to have a child process, don't forget to call * this from your child process right before exec. * * @param[in] lowfd Lower bound of FDs (you want STDIN to remain, no?). * @param[in] maxhint Hint of max FDs. * @param[in] noclose_fds A hash, whose keys are an allowlist. * * @internal * * As of writing, in spite of the name, this function does not actually close * anything. It just sets `FD_CLOEXEC` for everything and let `execve(2)` to * atomically close them at once. This is because as far as we know there are * no such platform that has `fork(2)` but lacks `FD_CLOEXEC`. * * Because this function is expected to run on a forked process it is entirely * async-signal-safe. */ void rb_close_before_exec(int lowfd, int maxhint, VALUE noclose_fds); RBIMPL_ATTR_NONNULL(()) /** * This is an rb_cloexec_pipe() + rb_update_max_fd() combo. * * @param[out] pipes Return buffer. Must at least hold 2 elements. * @retval 0 Successful creation of a pipe. * @retval -1 Failure in underlying system call(s). * @post `pipes` is filled with file descriptors. * @post `errno` is set on failure. */ int rb_pipe(int *pipes); /** * Queries if the given FD is reserved or not. Occasionally Ruby interpreter * opens files for its own purposes. Use this function to prevent touching * such behind-the-scene descriptors. * * @param[in] fd Target file descriptor. * @retval 1 `fd` is reserved. * @retval 0 Otherwise. */ int rb_reserved_fd_p(int fd); /** @alias{rb_reserved_fd_p} */ #define RB_RESERVED_FD_P(fd) rb_reserved_fd_p(fd) /** * Opens a file that closes on exec. In case of POSIX environments, a child * process inherits its parent's opened file descriptors. Which is nowadays * considered as one of the UNIX mistakes. This function opens a file * descriptor as `open(2)` does, but additionally instructs the operating * system that we don't want it be seen from child processes. * * @param[in] pathname File path to open. * @param[in] flags Open mode, as in `open(2)`. * @param[in] mode File mode, in case of `O_CREAT`. * @retval -1 `open(2)` failed for some reason. * @retval otherwise An allocated new file descriptor. * @note This function does not raise. * * @internal * * Whether this function can take NULL or not depends on the underlying open(2) * system call implementation but @shyouhei doesn't think it's worth trying. */ int rb_cloexec_open(const char *pathname, int flags, mode_t mode); /** * Identical to rb_cloexec_fcntl_dupfd(), except it implies minfd is 3. * * @param[in] oldfd File descriptor to duplicate. * @retval -1 `dup2(2)` failed for some reason. * @retval otherwise An allocated new file descriptor. * @note This function does not raise. */ int rb_cloexec_dup(int oldfd); /** * Identical to rb_cloexec_dup(), except you can specify the destination file * descriptor. If the destination is already squatted by another file * descriptor that gets silently closed without any warnings. (This is a spec * requested by POSIX.) * * @param[in] oldfd File descriptor to duplicate. * @param[in] newfd Return value destination. * @retval -1 `dup2(2)` failed for some reason. * @retval newfd An allocated new file descriptor. * @post Whatever sat at `newfd` gets closed with no notifications. * @post In case return value is -1 `newfd` is untouched. * @note This function does not raise. */ int rb_cloexec_dup2(int oldfd, int newfd); RBIMPL_ATTR_NONNULL(()) /** * Opens a pipe with closing on exec. In case of POSIX environments, a child * process inherits its parent's opened file descriptors. Which is nowadays * considered as one of the UNIX mistakes. This function opens a pipe as * `pipe(2)` does, but additionally instructs the operating system that we * don't want the duplicated FDs be seen from child processes. * * @param[out] fildes Return buffer. Must at least hold 2 elements. * @retval 0 Successful creation of a pipe. * @retval -1 Failure in underlying system call(s). * @post `pipes` is filled with file descriptors. * @post `errno` is set on failure. */ int rb_cloexec_pipe(int fildes[2]); /** * Duplicates a file descriptor with closing on exec. In case of POSIX * environments, a child process inherits its parent's opened file descriptors. * Which is nowadays considered as one of the UNIX mistakes. This function * duplicates a file descriptor as `dup(2)` does, but additionally instructs * the operating system that we don't want the duplicated FD be seen from child * processes. * * @param[in] fd File descriptor to duplicate. * @param[in] minfd Minimum allowed FD to return. * @retval -1 `dup(2)` failed for some reason. * @retval otherwise An allocated new file descriptor. * @note This function does not raise. * * `minfd` is handy when for instance STDERR is closed but you don't want to * use fd 2. */ int rb_cloexec_fcntl_dupfd(int fd, int minfd); /** * Informs the interpreter that the passed fd can be the max. This information * is used from rb_close_before_exec(). * * @param[in] fd An open FD, which can be large. */ void rb_update_max_fd(int fd); /** * Sets or clears the close-on-exec flag of the passed file descriptor to the * desired state. STDIN, STDOUT, STDERR are the exceptional file descriptors * that shall remain open. All others are to be closed on exec. When a C * extension library opens a file descriptor using anything other than * rb_cloexec_open() etc., that file descriptor shall experience this function. * * @param[in] fd An open file descriptor. */ void rb_fd_fix_cloexec(int fd); RBIMPL_SYMBOL_EXPORT_END() #endif /* RBIMPL_INTERN_IO_H */