ruby--ruby/include/ruby/io.h

#ifndef RUBY_IO_H                                    /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_IO_H 1
/**
 * @file
 * @author     $Author$
 * @date       Fri Nov 12 16:47:09 JST 1993
 * @copyright  Copyright (C) 1993-2007 Yukihiro Matsumoto
 * @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.
 */
#include "ruby/internal/config.h"

#include <stdio.h>
#include "ruby/encoding.h"

#if defined(HAVE_STDIO_EXT_H)
#include <stdio_ext.h>
#endif

#include <errno.h>
#if defined(HAVE_POLL)
#  ifdef _AIX
#    define reqevents events
#    define rtnevents revents
#  endif
#  include <poll.h>
#  ifdef _AIX
#    undef reqevents
#    undef rtnevents
#    undef events
#    undef revents
#  endif
#  define RB_WAITFD_IN  POLLIN
#  define RB_WAITFD_PRI POLLPRI
#  define RB_WAITFD_OUT POLLOUT
#else
#  define RB_WAITFD_IN  0x001
#  define RB_WAITFD_PRI 0x002
#  define RB_WAITFD_OUT 0x004
#endif

typedef enum {
    RUBY_IO_READABLE = RB_WAITFD_IN,
    RUBY_IO_WRITABLE = RB_WAITFD_OUT,
    RUBY_IO_PRIORITY = RB_WAITFD_PRI,
} rb_io_event_t;

#include "ruby/internal/dllexport.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()

PACKED_STRUCT_UNALIGNED(struct rb_io_buffer_t {
    char *ptr;                  /* off + len <= capa */
    int off;
    int len;
    int capa;
});
typedef struct rb_io_buffer_t rb_io_buffer_t;

typedef struct rb_io_t {
    VALUE self;

    FILE *stdio_file;		/* stdio ptr for read/write if available */
    int fd;                     /* file descriptor */
    int mode;			/* mode flags: FMODE_XXXs */
    rb_pid_t pid;		/* child's pid (for pipes) */
    int lineno;			/* number of lines read */
    VALUE pathv;		/* pathname for file */
    void (*finalize)(struct rb_io_t*,int); /* finalize proc */

    rb_io_buffer_t wbuf, rbuf;

    VALUE tied_io_for_writing;

    /*
     * enc  enc2 read action                      write action
     * NULL NULL force_encoding(default_external) write the byte sequence of str
     * e1   NULL force_encoding(e1)               convert str.encoding to e1
     * e1   e2   convert from e2 to e1            convert str.encoding to e2
     */
    struct rb_io_enc_t {
        rb_encoding *enc;
        rb_encoding *enc2;
        int ecflags;
        VALUE ecopts;
    } encs;

    rb_econv_t *readconv;
    rb_io_buffer_t cbuf;

    rb_econv_t *writeconv;
    VALUE writeconv_asciicompat;
    int writeconv_initialized;
    int writeconv_pre_ecflags;
    VALUE writeconv_pre_ecopts;

    VALUE write_lock;
} rb_io_t;

typedef struct rb_io_enc_t rb_io_enc_t;

#define HAVE_RB_IO_T 1

#define FMODE_READABLE              0x00000001
#define FMODE_WRITABLE              0x00000002
#define FMODE_READWRITE             (FMODE_READABLE|FMODE_WRITABLE)
#define FMODE_BINMODE               0x00000004
#define FMODE_SYNC                  0x00000008
#define FMODE_TTY                   0x00000010
#define FMODE_DUPLEX                0x00000020
#define FMODE_APPEND                0x00000040
#define FMODE_CREATE                0x00000080
/* #define FMODE_NOREVLOOKUP        0x00000100 */
#define FMODE_EXCL                  0x00000400
#define FMODE_TRUNC                 0x00000800
#define FMODE_TEXTMODE              0x00001000
/* #define FMODE_PREP               0x00010000 */
#define FMODE_SETENC_BY_BOM         0x00100000
/* #define FMODE_UNIX                  0x00200000 */
/* #define FMODE_INET                  0x00400000 */
/* #define FMODE_INET6                 0x00800000 */

#define RB_IO_POINTER(obj,fp) rb_io_check_closed((fp) = RFILE(rb_io_taint_check(obj))->fptr)
#define GetOpenFile RB_IO_POINTER

#define RB_IO_OPEN(obj, fp) do {\
    (fp) = rb_io_make_open_file(obj);\
} while (0)
#define MakeOpenFile RB_IO_OPEN

rb_io_t *rb_io_make_open_file(VALUE obj);

FILE *rb_io_stdio_file(rb_io_t *fptr);

FILE *rb_fdopen(int, const char*);
int rb_io_modestr_fmode(const char *modestr);
int rb_io_modestr_oflags(const char *modestr);
CONSTFUNC(int rb_io_oflags_fmode(int oflags));
void rb_io_check_writable(rb_io_t*);
void rb_io_check_readable(rb_io_t*);
void rb_io_check_char_readable(rb_io_t *fptr);
void rb_io_check_byte_readable(rb_io_t *fptr);
int rb_io_fptr_finalize(rb_io_t*);
void rb_io_synchronized(rb_io_t*);
void rb_io_check_initialized(rb_io_t*);
void rb_io_check_closed(rb_io_t*);
VALUE rb_io_get_io(VALUE io);
VALUE rb_io_check_io(VALUE io);
VALUE rb_io_get_write_io(VALUE io);
VALUE rb_io_set_write_io(VALUE io, VALUE w);
void rb_io_set_nonblock(rb_io_t *fptr);
int rb_io_extract_encoding_option(VALUE opt, rb_encoding **enc_p, rb_encoding **enc2_p, int *fmode_p);
void rb_io_extract_modeenc(VALUE *vmode_p, VALUE *vperm_p, VALUE opthash, int *oflags_p, int *fmode_p, rb_io_enc_t *convconfig_p);
ssize_t rb_io_bufwrite(VALUE io, const void *buf, size_t size);

int rb_io_wait_readable(int fd);
int rb_io_wait_writable(int fd);
int rb_wait_for_single_fd(int fd, int events, struct timeval *tv);

VALUE rb_io_wait(VALUE io, VALUE events, VALUE timeout);

/* compatibility for ruby 1.8 and older */
#define rb_io_mode_flags(modestr) [<"rb_io_mode_flags() is obsolete; use rb_io_modestr_fmode()">]
#define rb_io_modenum_flags(oflags) [<"rb_io_modenum_flags() is obsolete; use rb_io_oflags_fmode()">]

VALUE rb_io_taint_check(VALUE);
NORETURN(void rb_eof_error(void));

void rb_io_read_check(rb_io_t*);
int rb_io_read_pending(rb_io_t*);

struct stat;
VALUE rb_stat_new(const struct stat *);

/* gc.c */

RBIMPL_SYMBOL_EXPORT_END()

#endif /* RUBY_IO_H */