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io.c
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/**********************************************************************
io.c -
$Author$
created at: Fri Oct 15 18:08:59 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/io.h"
#include "ruby/thread.h"
#include "dln.h"
#include "internal.h"
#include "id.h"
#include <ctype.h>
#include <errno.h>
#include "ruby_atomic.h"
#define free(x) xfree(x)
#if defined(DOSISH) || defined(__CYGWIN__)
#include <io.h>
#endif
#include <sys/types.h>
#if defined HAVE_NET_SOCKET_H
# include <net/socket.h>
#elif defined HAVE_SYS_SOCKET_H
# ifndef __native_client__
# include <sys/socket.h>
# endif
#endif
#if defined(__BOW__) || defined(__CYGWIN__) || defined(_WIN32) || defined(__EMX__) || defined(__BEOS__) || defined(__HAIKU__)
# define NO_SAFE_RENAME
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__sun) || defined(_nec_ews)
# define USE_SETVBUF
#endif
#ifdef __QNXNTO__
#include "unix.h"
#endif
#include <sys/types.h>
#if defined(HAVE_SYS_IOCTL_H) && !defined(_WIN32)
#include <sys/ioctl.h>
#endif
#if defined(__native_client__) && defined(NACL_NEWLIB)
# include "nacl/ioctl.h"
#endif
#if defined(HAVE_FCNTL_H) || defined(_WIN32)
#include <fcntl.h>
#elif defined(HAVE_SYS_FCNTL_H)
#include <sys/fcntl.h>
#endif
#if !HAVE_OFF_T && !defined(off_t)
# define off_t long
#endif
#include <sys/stat.h>
/* EMX has sys/param.h, but.. */
#if defined(HAVE_SYS_PARAM_H) && !(defined(__EMX__) || defined(__HIUX_MPP__))
# include <sys/param.h>
#endif
#if !defined NOFILE
# define NOFILE 64
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYSCALL_H
#include <syscall.h>
#elif defined HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#if defined(__BEOS__) || defined(__HAIKU__)
# ifndef NOFILE
# define NOFILE (OPEN_MAX)
# endif
#endif
#include "ruby/util.h"
#ifndef O_ACCMODE
#define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
#endif
#if SIZEOF_OFF_T > SIZEOF_LONG && !defined(HAVE_LONG_LONG)
# error off_t is bigger than long, but you have no long long...
#endif
#ifndef PIPE_BUF
# ifdef _POSIX_PIPE_BUF
# define PIPE_BUF _POSIX_PIPE_BUF
# else
# define PIPE_BUF 512 /* is this ok? */
# endif
#endif
#ifndef EWOULDBLOCK
# define EWOULDBLOCK EAGAIN
#endif
#if defined(HAVE___SYSCALL) && (defined(__APPLE__) || defined(__OpenBSD__))
/* Mac OS X and OpenBSD have __syscall but don't define it in headers */
off_t __syscall(quad_t number, ...);
#endif
#define IO_RBUF_CAPA_MIN 8192
#define IO_CBUF_CAPA_MIN (128*1024)
#define IO_RBUF_CAPA_FOR(fptr) (NEED_READCONV(fptr) ? IO_CBUF_CAPA_MIN : IO_RBUF_CAPA_MIN)
#define IO_WBUF_CAPA_MIN 8192
/* define system APIs */
#ifdef _WIN32
#undef open
#define open rb_w32_uopen
#endif
VALUE rb_cIO;
VALUE rb_eEOFError;
VALUE rb_eIOError;
VALUE rb_mWaitReadable;
VALUE rb_mWaitWritable;
extern VALUE rb_eEAGAIN;
extern VALUE rb_eEWOULDBLOCK;
extern VALUE rb_eEINPROGRESS;
static VALUE rb_eEAGAINWaitReadable;
static VALUE rb_eEAGAINWaitWritable;
static VALUE rb_eEWOULDBLOCKWaitReadable;
static VALUE rb_eEWOULDBLOCKWaitWritable;
static VALUE rb_eEINPROGRESSWaitWritable;
static VALUE rb_eEINPROGRESSWaitReadable;
VALUE rb_stdin, rb_stdout, rb_stderr;
VALUE rb_deferr; /* rescue VIM plugin */
static VALUE orig_stdout, orig_stderr;
VALUE rb_output_fs;
VALUE rb_rs;
VALUE rb_output_rs;
VALUE rb_default_rs;
static VALUE argf;
static ID id_write, id_read, id_getc, id_flush, id_readpartial, id_set_encoding;
static VALUE sym_mode, sym_perm, sym_extenc, sym_intenc, sym_encoding, sym_open_args;
static VALUE sym_textmode, sym_binmode, sym_autoclose, sym_exception;
static VALUE sym_SET, sym_CUR, sym_END;
#ifdef SEEK_DATA
static VALUE sym_DATA;
#endif
#ifdef SEEK_HOLE
static VALUE sym_HOLE;
#endif
struct argf {
VALUE filename, current_file;
long last_lineno; /* $. */
long lineno;
VALUE argv;
char *inplace;
struct rb_io_enc_t encs;
int8_t init_p, next_p, binmode;
};
static rb_atomic_t max_file_descriptor = NOFILE;
void
rb_update_max_fd(int fd)
{
struct stat buf;
rb_atomic_t afd = (rb_atomic_t)fd;
if (afd <= max_file_descriptor)
return;
if (fstat(fd, &buf) != 0 && errno == EBADF) {
rb_bug("rb_update_max_fd: invalid fd (%d) given.", fd);
}
while (max_file_descriptor < afd) {
ATOMIC_CAS(max_file_descriptor, max_file_descriptor, afd);
}
}
void
rb_maygvl_fd_fix_cloexec(int fd)
{
/* MinGW don't have F_GETFD and FD_CLOEXEC. [ruby-core:40281] */
#if defined(HAVE_FCNTL) && defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
int flags, flags2, ret;
flags = fcntl(fd, F_GETFD); /* should not fail except EBADF. */
if (flags == -1) {
rb_bug("rb_maygvl_fd_fix_cloexec: fcntl(%d, F_GETFD) failed: %s", fd, strerror(errno));
}
if (fd <= 2)
flags2 = flags & ~FD_CLOEXEC; /* Clear CLOEXEC for standard file descriptors: 0, 1, 2. */
else
flags2 = flags | FD_CLOEXEC; /* Set CLOEXEC for non-standard file descriptors: 3, 4, 5, ... */
if (flags != flags2) {
ret = fcntl(fd, F_SETFD, flags2);
if (ret == -1) {
rb_bug("rb_maygvl_fd_fix_cloexec: fcntl(%d, F_SETFD, %d) failed: %s", fd, flags2, strerror(errno));
}
}
#endif
}
void
rb_fd_fix_cloexec(int fd)
{
rb_maygvl_fd_fix_cloexec(fd);
rb_update_max_fd(fd);
}
/* this is only called once */
static int
rb_fix_detect_o_cloexec(int fd)
{
#ifdef O_CLOEXEC
int flags = fcntl(fd, F_GETFD);
if (flags == -1)
rb_bug("rb_fix_detect_o_cloexec: fcntl(%d, F_GETFD) failed: %s", fd, strerror(errno));
if (flags & FD_CLOEXEC)
return 1;
#endif /* fall through if O_CLOEXEC does not work: */
rb_maygvl_fd_fix_cloexec(fd);
return 0;
}
int
rb_cloexec_open(const char *pathname, int flags, mode_t mode)
{
int ret;
static int o_cloexec_state = -1; /* <0: unknown, 0: ignored, >0: working */
#ifdef O_CLOEXEC
/* O_CLOEXEC is available since Linux 2.6.23. Linux 2.6.18 silently ignore it. */
flags |= O_CLOEXEC;
#elif defined O_NOINHERIT
flags |= O_NOINHERIT;
#endif
ret = open(pathname, flags, mode);
if (ret == -1) return -1;
if (ret <= 2 || o_cloexec_state == 0) {
rb_maygvl_fd_fix_cloexec(ret);
} else if (o_cloexec_state > 0) {
return ret;
} else {
o_cloexec_state = rb_fix_detect_o_cloexec(ret);
}
return ret;
}
int
rb_cloexec_dup(int oldfd)
{
/* Don't allocate standard file descriptors: 0, 1, 2 */
return rb_cloexec_fcntl_dupfd(oldfd, 3);
}
int
rb_cloexec_dup2(int oldfd, int newfd)
{
int ret;
/* When oldfd == newfd, dup2 succeeds but dup3 fails with EINVAL.
* rb_cloexec_dup2 succeeds as dup2. */
if (oldfd == newfd) {
ret = newfd;
}
else {
#if defined(HAVE_DUP3) && defined(O_CLOEXEC)
static int try_dup3 = 1;
if (2 < newfd && try_dup3) {
ret = dup3(oldfd, newfd, O_CLOEXEC);
if (ret != -1)
return ret;
/* dup3 is available since Linux 2.6.27, glibc 2.9. */
if (errno == ENOSYS) {
try_dup3 = 0;
ret = dup2(oldfd, newfd);
}
}
else {
ret = dup2(oldfd, newfd);
}
#else
ret = dup2(oldfd, newfd);
#endif
if (ret == -1) return -1;
}
rb_maygvl_fd_fix_cloexec(ret);
return ret;
}
int
rb_cloexec_pipe(int fildes[2])
{
int ret;
#if defined(HAVE_PIPE2)
static int try_pipe2 = 1;
if (try_pipe2) {
ret = pipe2(fildes, O_CLOEXEC);
if (ret != -1)
return ret;
/* pipe2 is available since Linux 2.6.27, glibc 2.9. */
if (errno == ENOSYS) {
try_pipe2 = 0;
ret = pipe(fildes);
}
}
else {
ret = pipe(fildes);
}
#else
ret = pipe(fildes);
#endif
if (ret == -1) return -1;
#ifdef __CYGWIN__
if (ret == 0 && fildes[1] == -1) {
close(fildes[0]);
fildes[0] = -1;
errno = ENFILE;
return -1;
}
#endif
rb_maygvl_fd_fix_cloexec(fildes[0]);
rb_maygvl_fd_fix_cloexec(fildes[1]);
return ret;
}
int
rb_cloexec_fcntl_dupfd(int fd, int minfd)
{
int ret;
#if defined(HAVE_FCNTL) && defined(F_DUPFD_CLOEXEC) && defined(F_DUPFD)
static int try_dupfd_cloexec = 1;
if (try_dupfd_cloexec) {
ret = fcntl(fd, F_DUPFD_CLOEXEC, minfd);
if (ret != -1) {
if (ret <= 2)
rb_maygvl_fd_fix_cloexec(ret);
return ret;
}
/* F_DUPFD_CLOEXEC is available since Linux 2.6.24. Linux 2.6.18 fails with EINVAL */
if (errno == EINVAL) {
ret = fcntl(fd, F_DUPFD, minfd);
if (ret != -1) {
try_dupfd_cloexec = 0;
}
}
}
else {
ret = fcntl(fd, F_DUPFD, minfd);
}
#elif defined(HAVE_FCNTL) && defined(F_DUPFD)
ret = fcntl(fd, F_DUPFD, minfd);
#elif defined(HAVE_DUP)
ret = dup(fd);
if (ret != -1 && ret < minfd) {
const int prev_fd = ret;
ret = rb_cloexec_fcntl_dupfd(fd, minfd);
close(prev_fd);
}
return ret;
#else
# error "dup() or fcntl(F_DUPFD) must be supported."
#endif
if (ret == -1) return -1;
rb_maygvl_fd_fix_cloexec(ret);
return ret;
}
#define argf_of(obj) (*(struct argf *)DATA_PTR(obj))
#define ARGF argf_of(argf)
#ifdef _STDIO_USES_IOSTREAM /* GNU libc */
# ifdef _IO_fpos_t
# define STDIO_READ_DATA_PENDING(fp) ((fp)->_IO_read_ptr != (fp)->_IO_read_end)
# else
# define STDIO_READ_DATA_PENDING(fp) ((fp)->_gptr < (fp)->_egptr)
# endif
#elif defined(FILE_COUNT)
# define STDIO_READ_DATA_PENDING(fp) ((fp)->FILE_COUNT > 0)
#elif defined(FILE_READEND)
# define STDIO_READ_DATA_PENDING(fp) ((fp)->FILE_READPTR < (fp)->FILE_READEND)
#elif defined(__BEOS__) || defined(__HAIKU__)
# define STDIO_READ_DATA_PENDING(fp) ((fp)->_state._eof == 0)
#else
# define STDIO_READ_DATA_PENDING(fp) (!feof(fp))
#endif
#define GetWriteIO(io) rb_io_get_write_io(io)
#define READ_DATA_PENDING(fptr) ((fptr)->rbuf.len)
#define READ_DATA_PENDING_COUNT(fptr) ((fptr)->rbuf.len)
#define READ_DATA_PENDING_PTR(fptr) ((fptr)->rbuf.ptr+(fptr)->rbuf.off)
#define READ_DATA_BUFFERED(fptr) READ_DATA_PENDING(fptr)
#define READ_CHAR_PENDING(fptr) ((fptr)->cbuf.len)
#define READ_CHAR_PENDING_COUNT(fptr) ((fptr)->cbuf.len)
#define READ_CHAR_PENDING_PTR(fptr) ((fptr)->cbuf.ptr+(fptr)->cbuf.off)
#if defined(_WIN32)
#define WAIT_FD_IN_WIN32(fptr) \
(rb_w32_io_cancelable_p((fptr)->fd) ? 0 : rb_thread_wait_fd((fptr)->fd))
#else
#define WAIT_FD_IN_WIN32(fptr)
#endif
#define READ_CHECK(fptr) do {\
if (!READ_DATA_PENDING(fptr)) {\
WAIT_FD_IN_WIN32(fptr);\
rb_io_check_closed(fptr);\
}\
} while(0)
#ifndef S_ISSOCK
# ifdef _S_ISSOCK
# define S_ISSOCK(m) _S_ISSOCK(m)
# else
# ifdef _S_IFSOCK
# define S_ISSOCK(m) (((m) & S_IFMT) == _S_IFSOCK)
# else
# ifdef S_IFSOCK
# define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
# endif
# endif
# endif
#endif
static int io_fflush(rb_io_t *);
static rb_io_t *flush_before_seek(rb_io_t *fptr);
#define NEED_NEWLINE_DECORATOR_ON_READ(fptr) ((fptr)->mode & FMODE_TEXTMODE)
#define NEED_NEWLINE_DECORATOR_ON_WRITE(fptr) ((fptr)->mode & FMODE_TEXTMODE)
#if defined(RUBY_TEST_CRLF_ENVIRONMENT) || defined(_WIN32)
/* Windows */
# define DEFAULT_TEXTMODE FMODE_TEXTMODE
# define TEXTMODE_NEWLINE_DECORATOR_ON_WRITE ECONV_CRLF_NEWLINE_DECORATOR
/*
* CRLF newline is set as default newline decorator.
* If only CRLF newline conversion is needed, we use binary IO process
* with OS's text mode for IO performance improvement.
* If encoding conversion is needed or a user sets text mode, we use encoding
* conversion IO process and universal newline decorator by default.
*/
#define NEED_READCONV(fptr) ((fptr)->encs.enc2 != NULL || (fptr)->encs.ecflags & ~ECONV_CRLF_NEWLINE_DECORATOR)
#define NEED_WRITECONV(fptr) (((fptr)->encs.enc != NULL && (fptr)->encs.enc != rb_ascii8bit_encoding()) || ((fptr)->encs.ecflags & ((ECONV_DECORATOR_MASK & ~ECONV_CRLF_NEWLINE_DECORATOR)|ECONV_STATEFUL_DECORATOR_MASK)))
#define SET_BINARY_MODE(fptr) setmode((fptr)->fd, O_BINARY)
#define NEED_NEWLINE_DECORATOR_ON_READ_CHECK(fptr) do {\
if (NEED_NEWLINE_DECORATOR_ON_READ(fptr)) {\
if (((fptr)->mode & FMODE_READABLE) &&\
!((fptr)->encs.ecflags & ECONV_NEWLINE_DECORATOR_MASK)) {\
setmode((fptr)->fd, O_BINARY);\
}\
else {\
setmode((fptr)->fd, O_TEXT);\
}\
}\
} while(0)
#define SET_UNIVERSAL_NEWLINE_DECORATOR_IF_ENC2(enc2, ecflags) do {\
if ((enc2) && ((ecflags) & ECONV_DEFAULT_NEWLINE_DECORATOR)) {\
(ecflags) |= ECONV_UNIVERSAL_NEWLINE_DECORATOR;\
}\
} while(0)
/*
* IO unread with taking care of removed '\r' in text mode.
*/
static void
io_unread(rb_io_t *fptr)
{
off_t r, pos;
ssize_t read_size;
long i;
long newlines = 0;
long extra_max;
char *p;
char *buf;
rb_io_check_closed(fptr);
if (fptr->rbuf.len == 0 || fptr->mode & FMODE_DUPLEX) {
return;
}
errno = 0;
if (!rb_w32_fd_is_text(fptr->fd)) {
r = lseek(fptr->fd, -fptr->rbuf.len, SEEK_CUR);
if (r < 0 && errno) {
if (errno == ESPIPE)
fptr->mode |= FMODE_DUPLEX;
return;
}
fptr->rbuf.off = 0;
fptr->rbuf.len = 0;
return;
}
pos = lseek(fptr->fd, 0, SEEK_CUR);
if (pos < 0 && errno) {
if (errno == ESPIPE)
fptr->mode |= FMODE_DUPLEX;
return;
}
/* add extra offset for removed '\r' in rbuf */
extra_max = (long)(pos - fptr->rbuf.len);
p = fptr->rbuf.ptr + fptr->rbuf.off;
/* if the end of rbuf is '\r', rbuf doesn't have '\r' within rbuf.len */
if (*(fptr->rbuf.ptr + fptr->rbuf.capa - 1) == '\r') {
newlines++;
}
for (i = 0; i < fptr->rbuf.len; i++) {
if (*p == '\n') newlines++;
if (extra_max == newlines) break;
p++;
}
buf = ALLOC_N(char, fptr->rbuf.len + newlines);
while (newlines >= 0) {
r = lseek(fptr->fd, pos - fptr->rbuf.len - newlines, SEEK_SET);
if (newlines == 0) break;
if (r < 0) {
newlines--;
continue;
}
read_size = _read(fptr->fd, buf, fptr->rbuf.len + newlines);
if (read_size < 0) {
free(buf);
rb_sys_fail_path(fptr->pathv);
}
if (read_size == fptr->rbuf.len) {
lseek(fptr->fd, r, SEEK_SET);
break;
}
else {
newlines--;
}
}
free(buf);
fptr->rbuf.off = 0;
fptr->rbuf.len = 0;
return;
}
/*
* We use io_seek to back cursor position when changing mode from text to binary,
* but stdin and pipe cannot seek back. Stdin and pipe read should use encoding
* conversion for working properly with mode change.
*
* Return previous translation mode.
*/
static inline int
set_binary_mode_with_seek_cur(rb_io_t *fptr)
{
if (!rb_w32_fd_is_text(fptr->fd)) return O_BINARY;
if (fptr->rbuf.len == 0 || fptr->mode & FMODE_DUPLEX) {
return setmode(fptr->fd, O_BINARY);
}
flush_before_seek(fptr);
return setmode(fptr->fd, O_BINARY);
}
#define SET_BINARY_MODE_WITH_SEEK_CUR(fptr) set_binary_mode_with_seek_cur(fptr)
#else
/* Unix */
# define DEFAULT_TEXTMODE 0
#define NEED_READCONV(fptr) ((fptr)->encs.enc2 != NULL || NEED_NEWLINE_DECORATOR_ON_READ(fptr))
#define NEED_WRITECONV(fptr) (((fptr)->encs.enc != NULL && (fptr)->encs.enc != rb_ascii8bit_encoding()) || NEED_NEWLINE_DECORATOR_ON_WRITE(fptr) || ((fptr)->encs.ecflags & (ECONV_DECORATOR_MASK|ECONV_STATEFUL_DECORATOR_MASK)))
#define SET_BINARY_MODE(fptr) (void)(fptr)
#define NEED_NEWLINE_DECORATOR_ON_READ_CHECK(fptr) (void)(fptr)
#define SET_UNIVERSAL_NEWLINE_DECORATOR_IF_ENC2(enc2, ecflags) ((void)(enc2), (void)(ecflags))
#define SET_BINARY_MODE_WITH_SEEK_CUR(fptr) (void)(fptr)
#endif
#if !defined HAVE_SHUTDOWN && !defined shutdown
#define shutdown(a,b) 0
#endif
#if defined(_WIN32)
#define is_socket(fd, path) rb_w32_is_socket(fd)
#elif !defined(S_ISSOCK)
#define is_socket(fd, path) 0
#else
static int
is_socket(int fd, VALUE path)
{
struct stat sbuf;
if (fstat(fd, &sbuf) < 0)
rb_sys_fail_path(path);
return S_ISSOCK(sbuf.st_mode);
}
#endif
void
rb_eof_error(void)
{
rb_raise(rb_eEOFError, "end of file reached");
}
VALUE
rb_io_taint_check(VALUE io)
{
rb_check_frozen(io);
return io;
}
void
rb_io_check_initialized(rb_io_t *fptr)
{
if (!fptr) {
rb_raise(rb_eIOError, "uninitialized stream");
}
}
void
rb_io_check_closed(rb_io_t *fptr)
{
rb_io_check_initialized(fptr);
if (fptr->fd < 0) {
rb_raise(rb_eIOError, "closed stream");
}
}
VALUE
rb_io_get_io(VALUE io)
{
return rb_convert_type(io, T_FILE, "IO", "to_io");
}
VALUE
rb_io_check_io(VALUE io)
{
return rb_check_convert_type(io, T_FILE, "IO", "to_io");
}
VALUE
rb_io_get_write_io(VALUE io)
{
VALUE write_io;
rb_io_check_initialized(RFILE(io)->fptr);
write_io = RFILE(io)->fptr->tied_io_for_writing;
if (write_io) {
return write_io;
}
return io;
}
VALUE
rb_io_set_write_io(VALUE io, VALUE w)
{
VALUE write_io;
rb_io_check_initialized(RFILE(io)->fptr);
if (!RTEST(w)) {
w = 0;
}
else {
GetWriteIO(w);
}
write_io = RFILE(io)->fptr->tied_io_for_writing;
RFILE(io)->fptr->tied_io_for_writing = w;
return write_io ? write_io : Qnil;
}
/*
* call-seq:
* IO.try_convert(obj) -> io or nil
*
* Try to convert <i>obj</i> into an IO, using to_io method.
* Returns converted IO or nil if <i>obj</i> cannot be converted
* for any reason.
*
* IO.try_convert(STDOUT) #=> STDOUT
* IO.try_convert("STDOUT") #=> nil
*
* require 'zlib'
* f = open("/tmp/zz.gz") #=> #<File:/tmp/zz.gz>
* z = Zlib::GzipReader.open(f) #=> #<Zlib::GzipReader:0x81d8744>
* IO.try_convert(z) #=> #<File:/tmp/zz.gz>
*
*/
static VALUE
rb_io_s_try_convert(VALUE dummy, VALUE io)
{
return rb_io_check_io(io);
}
#if !(defined(RUBY_TEST_CRLF_ENVIRONMENT) || defined(_WIN32))
static void
io_unread(rb_io_t *fptr)
{
off_t r;
rb_io_check_closed(fptr);
if (fptr->rbuf.len == 0 || fptr->mode & FMODE_DUPLEX)
return;
/* xxx: target position may be negative if buffer is filled by ungetc */
errno = 0;
r = lseek(fptr->fd, -fptr->rbuf.len, SEEK_CUR);
if (r < 0 && errno) {
if (errno == ESPIPE)
fptr->mode |= FMODE_DUPLEX;
return;
}
fptr->rbuf.off = 0;
fptr->rbuf.len = 0;
return;
}
#endif
static rb_encoding *io_input_encoding(rb_io_t *fptr);
static void
io_ungetbyte(VALUE str, rb_io_t *fptr)
{
long len = RSTRING_LEN(str);
if (fptr->rbuf.ptr == NULL) {
const int min_capa = IO_RBUF_CAPA_FOR(fptr);
fptr->rbuf.off = 0;
fptr->rbuf.len = 0;
#if SIZEOF_LONG > SIZEOF_INT
if (len > INT_MAX)
rb_raise(rb_eIOError, "ungetbyte failed");
#endif
if (len > min_capa)
fptr->rbuf.capa = (int)len;
else
fptr->rbuf.capa = min_capa;
fptr->rbuf.ptr = ALLOC_N(char, fptr->rbuf.capa);
}
if (fptr->rbuf.capa < len + fptr->rbuf.len) {
rb_raise(rb_eIOError, "ungetbyte failed");
}
if (fptr->rbuf.off < len) {
MEMMOVE(fptr->rbuf.ptr+fptr->rbuf.capa-fptr->rbuf.len,
fptr->rbuf.ptr+fptr->rbuf.off,
char, fptr->rbuf.len);
fptr->rbuf.off = fptr->rbuf.capa-fptr->rbuf.len;
}
fptr->rbuf.off-=(int)len;
fptr->rbuf.len+=(int)len;
MEMMOVE(fptr->rbuf.ptr+fptr->rbuf.off, RSTRING_PTR(str), char, len);
}
static rb_io_t *
flush_before_seek(rb_io_t *fptr)
{
if (io_fflush(fptr) < 0)
rb_sys_fail(0);
io_unread(fptr);
errno = 0;
return fptr;
}
#define io_seek(fptr, ofs, whence) (errno = 0, lseek(flush_before_seek(fptr)->fd, (ofs), (whence)))
#define io_tell(fptr) lseek(flush_before_seek(fptr)->fd, 0, SEEK_CUR)
#ifndef SEEK_CUR
# define SEEK_SET 0
# define SEEK_CUR 1
# define SEEK_END 2
#endif
void
rb_io_check_char_readable(rb_io_t *fptr)
{
rb_io_check_closed(fptr);
if (!(fptr->mode & FMODE_READABLE)) {
rb_raise(rb_eIOError, "not opened for reading");
}
if (fptr->wbuf.len) {
if (io_fflush(fptr) < 0)
rb_sys_fail(0);
}
if (fptr->tied_io_for_writing) {
rb_io_t *wfptr;
GetOpenFile(fptr->tied_io_for_writing, wfptr);
if (io_fflush(wfptr) < 0)
rb_sys_fail(0);
}
}
void
rb_io_check_byte_readable(rb_io_t *fptr)
{
rb_io_check_char_readable(fptr);
if (READ_CHAR_PENDING(fptr)) {
rb_raise(rb_eIOError, "byte oriented read for character buffered IO");
}
}
void
rb_io_check_readable(rb_io_t *fptr)
{
rb_io_check_byte_readable(fptr);
}
static rb_encoding*
io_read_encoding(rb_io_t *fptr)
{
if (fptr->encs.enc) {
return fptr->encs.enc;
}
return rb_default_external_encoding();
}
static rb_encoding*
io_input_encoding(rb_io_t *fptr)
{
if (fptr->encs.enc2) {
return fptr->encs.enc2;
}
return io_read_encoding(fptr);
}
void
rb_io_check_writable(rb_io_t *fptr)
{
rb_io_check_closed(fptr);
if (!(fptr->mode & FMODE_WRITABLE)) {
rb_raise(rb_eIOError, "not opened for writing");
}
if (fptr->rbuf.len) {
io_unread(fptr);
}
}
int
rb_io_read_pending(rb_io_t *fptr)
{
/* This function is used for bytes and chars. Confusing. */
if (READ_CHAR_PENDING(fptr))
return 1; /* should raise? */
return READ_DATA_PENDING(fptr);
}
void
rb_read_check(FILE *fp)
{
if (!STDIO_READ_DATA_PENDING(fp)) {
rb_thread_wait_fd(fileno(fp));
}
}
void
rb_io_read_check(rb_io_t *fptr)
{
if (!READ_DATA_PENDING(fptr)) {
rb_thread_wait_fd(fptr->fd);
}
return;
}
static int
ruby_dup(int orig)
{
int fd;
fd = rb_cloexec_dup(orig);
if (fd < 0) {
if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
rb_gc();
fd = rb_cloexec_dup(orig);
}
if (fd < 0) {
rb_sys_fail(0);
}
}
rb_update_max_fd(fd);
return fd;
}
static VALUE
io_alloc(VALUE klass)
{
NEWOBJ_OF(io, struct RFile, klass, T_FILE);
io->fptr = 0;
return (VALUE)io;
}
#ifndef S_ISREG
# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
static int
wsplit_p(rb_io_t *fptr)
{
#if defined(HAVE_FCNTL) && defined(F_GETFL) && defined(O_NONBLOCK)
int r;
#endif
if (!(fptr->mode & FMODE_WSPLIT_INITIALIZED)) {
struct stat buf;
if (fstat(fptr->fd, &buf) == 0 &&
!S_ISREG(buf.st_mode)
#if defined(HAVE_FCNTL) && defined(F_GETFL) && defined(O_NONBLOCK)
&& (r = fcntl(fptr->fd, F_GETFL)) != -1 &&
!(r & O_NONBLOCK)
#endif
) {
fptr->mode |= FMODE_WSPLIT;
}
fptr->mode |= FMODE_WSPLIT_INITIALIZED;
}
return fptr->mode & FMODE_WSPLIT;
}
struct io_internal_read_struct {
int fd;
void *buf;
size_t capa;
};
struct io_internal_write_struct {
int fd;
const void *buf;
size_t capa;
};
#ifdef HAVE_WRITEV
struct io_internal_writev_struct {
int fd;
const struct iovec *iov;
int iovcnt;
};
#endif
static VALUE
internal_read_func(void *ptr)
{
struct io_internal_read_struct *iis = ptr;
return read(iis->fd, iis->buf, iis->capa);
}
static VALUE
internal_write_func(void *ptr)
{
struct io_internal_write_struct *iis = ptr;
return write(iis->fd, iis->buf, iis->capa);
}
static void*
internal_write_func2(void *ptr)
{
struct io_internal_write_struct *iis = ptr;
return (void*)(intptr_t)write(iis->fd, iis->buf, iis->capa);
}
#ifdef HAVE_WRITEV
static VALUE
internal_writev_func(void *ptr)
{
struct io_internal_writev_struct *iis = ptr;
return writev(iis->fd, iis->iov, iis->iovcnt);
}
#endif
static ssize_t
rb_read_internal(int fd, void *buf, size_t count)
{
struct io_internal_read_struct iis;
iis.fd = fd;
iis.buf = buf;
iis.capa = count;
return (ssize_t)rb_thread_io_blocking_region(internal_read_func, &iis, fd);
}