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rktio_fd.c
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rktio_fd.c
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#include "rktio.h"
#include "rktio_private.h"
#include <errno.h>
#include <stdlib.h>
#ifdef RKTIO_SYSTEM_UNIX
# include <sys/stat.h>
# include <fcntl.h>
# include <unistd.h>
# include <sys/select.h>
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
# include <windows.h>
# include <string.h>
#endif
#ifdef HAVE_POLL_SYSCALL
# include <poll.h>
#endif
/*========================================================================*/
/* fd struct */
/*========================================================================*/
struct rktio_fd_t {
int modes;
#ifdef RKTIO_SYSTEM_UNIX
intptr_t fd;
# ifdef SOME_FDS_ARE_NOT_SELECTABLE
int bufcount;
char buffer[1];
# endif
# ifdef RKTIO_USE_PENDING_OPEN
struct open_in_thread_t *pending;
# endif
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
union {
HANDLE fd;
SOCKET sock; /* when `modes & RKTIO_OPEN_SOCKET` */
};
struct Win_FD_Input_Thread *th; /* input mode */
struct Win_FD_Output_Thread *oth; /* output mode */
int unblocked; /* whether non-blocking mode is installed */
int write_limit; /* non-0 => max on amount to try writing */
char *buffer; /* shared with reading thread */
int has_pending_byte; /* for text-mode input, may be dropped by a following lf */
int pending_byte; /* for text-mode input, either a CR waiting to decode, or byte that didn't fit */
int leftover_len; /* for bytes that should be written/read, but that form a UTF-8 encoding prefix/suffix */
char leftover[6];
int w_buf_count; /* number of console wide chars in `buffer` pending to encode */
#endif
};
struct rktio_fd_transfer_t {
rktio_fd_t fd;
};
/*========================================================================*/
/* Windows I/O helper structs */
/*========================================================================*/
#ifdef RKTIO_SYSTEM_WINDOWS
/* There doesn't appear to be a good answer for fd-style waiting on
input with a Windows console handle.
When USE_BACKGROUND_THREAD_FOR_CONSOLE_INPUT is 0, the
implementation here treats the input as ready as soon as there are
events in the console, but those might be key events that haven't
been submitted by hitting Return. So, a `sync` could return too
early and reading can block when it shouldn't.
When USE_BACKGROUND_THREAD_FOR_CONSOLE_INPUT is 1, a background
thread avoids that problem with blocking, but can consume
characters while waiting, which means the console handle can't be
shared (with expeditor, for example). */
#define USE_BACKGROUND_THREAD_FOR_CONSOLE_INPUT 0
typedef struct Win_FD_Input_Thread {
/* This is malloced for use in a Win32 thread */
HANDLE fd;
int avail, offset, err, checking, you_clean_up;
int *refcount;
HANDLE eof;
unsigned char *buffer;
HANDLE lock_sema, checking_sema, ready_sema;
HANDLE thread;
} Win_FD_Input_Thread;
typedef struct Win_FD_Output_Thread {
/* This is malloced for use in a Win32 thread */
HANDLE fd;
int nonblocking; /* non-zero => an NT pipe where non-blocking WriteFile
works. We still use a thread to detect when the
write has ben flushed, which in turn is needed to
know whether future writes will immediately succeed. */
int flushed, needflush; /* Used for non-blocking, only. The flushed
flag communicates from the flush-testing thread
to the main thread. For efficiency, we request
flush checking only when needed (instead of
after every write); needflush indicates that
a flush check is currently needed, but hasn't
been started. */
int done, err_no, you_clean_up;
unsigned int buflen; /* used for blocking, only */
unsigned char *buffer; /* used for blocking, only */
int *refcount;
HANDLE lock_sema, work_sema, ready_sema;
HANDLE thread;
} Win_FD_Output_Thread;
# define RKTIO_FD_BUFFSIZE 4096
static void init_read_fd(rktio_t *rktio, rktio_fd_t *rfd);
static void deinit_read_fd(rktio_fd_t *rfd, int full_close);
static void deinit_write_fd(rktio_fd_t *rfd, int full_close);
static void deinit_fd(rktio_fd_t *rfd, int full_close)
{
deinit_read_fd(rfd, full_close);
deinit_write_fd(rfd, full_close);
}
#define DELAYED_CONSOLE_HANDLE ((HANDLE)-2)
static void force_console(rktio_fd_t *rfd);
static HANDLE get_std_handle(int which);
static long WINAPI WindowsFDReader(Win_FD_Input_Thread *th);
static void WindowsFDICleanup(Win_FD_Input_Thread *th, int close_mode);
static long WINAPI WindowsFDWriter(Win_FD_Output_Thread *oth);
static void WindowsFDOCleanup(Win_FD_Output_Thread *oth, int close_mode);
typedef BOOL (WINAPI* CSI_proc)(HANDLE);
static CSI_proc get_csi(void)
{
static int tried_csi = 0;
static CSI_proc csi;
if (!tried_csi) {
HMODULE hm;
hm = LoadLibraryW(L"kernel32.dll");
if (hm)
csi = (CSI_proc)GetProcAddress(hm, "CancelSynchronousIo");
else
csi = NULL;
tried_csi = 1;
}
return csi;
}
static intptr_t adjust_input_text(rktio_fd_t *rfd, char *buffer, char *is_converted,
intptr_t got, intptr_t offset);
static intptr_t adjust_input_text_for_pending_cr(rktio_fd_t *rfd, char *buffer, char *is_converted,
intptr_t got);
static const char *adjust_output_text(const char *buffer, intptr_t *towrite);
static intptr_t recount_output_text(const char *orig_buffer, const char *buffer, intptr_t wrote);
static wchar_t *convert_output_wtext(const char *buffer, intptr_t *_towrite,
int *_can_leftover, int *_keep_leftover,
int leftover_len, char *leftover);
static intptr_t recount_output_wtext(wchar_t *w_buffer, intptr_t winwrote);
#define MIN_VIA_WIDE_BUFFER_SIZE 6
static int read_console_via_wide(HANDLE fd,
wchar_t *w_buffer, DWORD w_buf_len, int *_w_buf_count,
void *dest_buffer, DWORD dest_len, DWORD *_got);
#endif
/*========================================================================*/
/* creating an fd */
/*========================================================================*/
rktio_fd_t *rktio_system_fd(rktio_t *rktio, intptr_t system_fd, int modes)
{
rktio_fd_t *rfd;
rfd = calloc(1, sizeof(rktio_fd_t));
rfd->modes = (modes - (modes & RKTIO_OPEN_INIT));
#ifdef RKTIO_SYSTEM_UNIX
rfd->fd = system_fd;
if (!(modes & (RKTIO_OPEN_REGFILE | RKTIO_OPEN_NOT_REGFILE | RKTIO_OPEN_SOCKET))) {
struct stat buf;
int cr;
do {
cr = fstat(rfd->fd, &buf);
} while ((cr == -1) && (errno == EINTR));
if (S_ISREG(buf.st_mode))
rfd->modes |= RKTIO_OPEN_REGFILE;
if (!(modes & (RKTIO_OPEN_DIR | RKTIO_OPEN_NOT_DIR)))
if (S_ISDIR(buf.st_mode))
rfd->modes |= RKTIO_OPEN_DIR;
}
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (modes & RKTIO_OPEN_SOCKET)
rfd->sock = (SOCKET)system_fd;
else
rfd->fd = (HANDLE)system_fd;
if (!(modes & (RKTIO_OPEN_REGFILE | RKTIO_OPEN_NOT_REGFILE | RKTIO_OPEN_SOCKET))
&& (rfd->fd != DELAYED_CONSOLE_HANDLE)) {
if ((GetFileType(rfd->fd) == FILE_TYPE_DISK))
rfd->modes |= RKTIO_OPEN_REGFILE;
if (!(modes & (RKTIO_OPEN_DIR | RKTIO_OPEN_NOT_DIR))) {
BY_HANDLE_FILE_INFORMATION info;
if (GetFileInformationByHandle(rfd->fd, &info)) {
if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
rfd->modes |= RKTIO_OPEN_DIR;
}
}
}
}
#endif
if ((modes & RKTIO_OPEN_SOCKET) && (modes & RKTIO_OPEN_INIT))
rktio_socket_init(rktio, rfd);
if ((modes & RKTIO_OPEN_SOCKET) && (modes & RKTIO_OPEN_OWN))
rktio_socket_own(rktio, rfd);
return rfd;
}
int rktio_fd_is_pending_open(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending)
rktio_pending_open_poll(rktio, rfd, rfd->pending);
return !!rfd->pending;
#else
return 0;
#endif
}
#ifdef RKTIO_USE_PENDING_OPEN
rktio_fd_t *rktio_pending_system_fd(rktio_t *rktio, struct open_in_thread_t *oit, int modes)
{
rktio_fd_t *rfd;
rfd = calloc(1, sizeof(rktio_fd_t));
rfd->modes = (modes - (modes & RKTIO_OPEN_INIT));
rfd->pending = oit;
return rfd;
}
void rktio_update_system_fd(rktio_t *rktio, rktio_fd_t *rfd, int fd, int modes)
/* Convert an open-pending rfd to a normal rfd. The given `modes` adds
to (and completes) the modes provided to `rktio_pending_system_fd`. */
{
rfd->fd = fd;
rfd->modes |= modes;
rfd->pending = NULL;
}
#endif
intptr_t rktio_internal_fd_system_fd(rktio_fd_t *rfd)
{
#ifdef RKTIO_SYSTEM_UNIX
# ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending) return -1;
# endif
return rfd->fd;
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_SOCKET)
return (intptr_t)rfd->sock;
else {
force_console(rfd);
return (intptr_t)rfd->fd;
}
#endif
}
intptr_t rktio_fd_system_fd(rktio_t *rktio, rktio_fd_t *rfd)
{
return rktio_internal_fd_system_fd(rfd);
}
rktio_fd_t *rktio_std_fd(rktio_t *rktio, int which)
{
int mode = ((which == RKTIO_STDIN)
? RKTIO_OPEN_READ
: RKTIO_OPEN_WRITE);
#ifdef RKTIO_SYSTEM_UNIX
return rktio_system_fd(rktio, which, mode | RKTIO_OPEN_NOT_DIR);
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
HANDLE h;
switch (which) {
case RKTIO_STDIN:
which = STD_INPUT_HANDLE;
break;
case RKTIO_STDOUT:
which = STD_OUTPUT_HANDLE;
break;
case RKTIO_STDERR:
which = STD_ERROR_HANDLE;
break;
}
h = get_std_handle(which);
if ((h == INVALID_HANDLE_VALUE) || (h == NULL)) {
h = DELAYED_CONSOLE_HANDLE; /* => open a console on demand */
}
return rktio_system_fd(rktio,
(intptr_t)h,
mode | RKTIO_OPEN_NOT_DIR);
#endif
}
int rktio_fd_is_regular_file(rktio_t *rktio, rktio_fd_t *rfd)
{
return ((rfd->modes & RKTIO_OPEN_REGFILE) ? 1 : 0);
}
int rktio_fd_is_directory(rktio_t *rktio, rktio_fd_t *rfd)
{
return ((rfd->modes & RKTIO_OPEN_DIR) ? 1 : 0);
}
int rktio_fd_is_socket(rktio_t *rktio, rktio_fd_t *rfd)
{
return ((rfd->modes & RKTIO_OPEN_SOCKET) ? 1 : 0);
}
int rktio_fd_is_udp(rktio_t *rktio, rktio_fd_t *rfd)
{
return ((rfd->modes & RKTIO_OPEN_UDP) ? 1 : 0);
}
int rktio_fd_is_open_pending(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending) return 1;
#endif
return 0;
}
int rktio_fd_modes(rktio_t *rktio, rktio_fd_t *rfd)
{
return rfd->modes;
}
int rktio_system_fd_is_terminal(rktio_t *rktio, intptr_t fd)
{
#ifdef RKTIO_SYSTEM_UNIX
return isatty(fd);
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if ((HANDLE)fd == DELAYED_CONSOLE_HANDLE)
return 1; /* delayed console */
else if (GetFileType((HANDLE)fd) == FILE_TYPE_CHAR) {
DWORD mode;
if (GetConsoleMode((HANDLE)fd, &mode))
return 1;
else
return 0;
} else
return 0;
#endif
}
int rktio_fd_is_terminal(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending) return 0;
#endif
return rktio_system_fd_is_terminal(rktio, (intptr_t)rfd->fd);
}
int rktio_fd_is_text_converted(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_TEXT)
return 1;
#endif
return 0;
}
rktio_fd_t *rktio_dup(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_SYSTEM_UNIX
intptr_t nfd;
# ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending) {
rktio_pending_open_retain(rktio, rfd->pending);
return rktio_pending_system_fd(rktio, rfd->pending, rfd->modes);
}
# endif
rktio_cloexec_lock();
do {
nfd = dup(rfd->fd);
} while (nfd == -1 && errno == EINTR);
if (nfd != -1)
rktio_fd_cloexec(nfd);
else
get_posix_error();
rktio_cloexec_unlock();
if (nfd == -1) {
return NULL;
} else {
/* Set the `RKTIO_OPEN_INIT` flag, because dup()ing a file
descriptor does not keep all of its properties on some
platforms (e.g., the non-blocking property on sockets on
Linux). */
return rktio_system_fd(rktio, nfd, rfd->modes | RKTIO_OPEN_INIT);
}
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_SOCKET) {
return rktio_socket_dup(rktio, rfd);
} else {
HANDLE newhandle;
BOOL rc;
if (rfd->fd == DELAYED_CONSOLE_HANDLE) {
newhandle = DELAYED_CONSOLE_HANDLE;
rc = TRUE;
} else
rc = DuplicateHandle(GetCurrentProcess(), rfd->fd,
GetCurrentProcess(), &newhandle,
0, FALSE, DUPLICATE_SAME_ACCESS);
if (rc == FALSE) {
get_windows_error();
return NULL;
} else {
return rktio_system_fd(rktio, (intptr_t)newhandle, rfd->modes);
}
}
#endif
}
void rktio_fd_cloexec(intptr_t fd) {
#ifdef RKTIO_SYSTEM_UNIX
# ifdef RKTIO_HAS_CLOEXEC
int flags;
flags = fcntl(fd, F_GETFD, 0);
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
# endif
#endif
}
/*========================================================================*/
/* closing */
/*========================================================================*/
#ifdef RKTIO_SYSTEM_UNIX
int rktio_reliably_close_err(intptr_t s) {
int cr;
do {
cr = close(s);
} while ((cr == -1) && (errno == EINTR));
return cr;
}
void rktio_reliably_close(intptr_t s)
{
(void)rktio_reliably_close_err(s);
}
#endif
static rktio_ok_t do_close(rktio_t *rktio /* maybe NULL */, rktio_fd_t *rfd, int set_error)
/* The `rktio` argument can be NULL for a detached file descriptor */
{
int ok;
#ifdef RKTIO_SYSTEM_UNIX
int cr;
# ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending)
cr = rktio_pending_open_release(rktio, rfd->pending);
else
# endif
cr = rktio_reliably_close_err(rfd->fd);
# ifdef RKTIO_USE_FCNTL_AND_FORK_FOR_FILE_LOCKS
if (rktio && !(rfd->modes & RKTIO_OPEN_SOCKET) && (!cr || !set_error))
rktio_release_lockf(rktio, rfd->fd);
# endif
if (cr && set_error) {
get_posix_error();
ok = 0;
} else
ok = 1;
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_SOCKET)
return rktio_socket_close(rktio, rfd, set_error);
deinit_fd(rfd, 1);
ok = 1;
if (!rfd->th && !rfd->oth && (rfd->fd != DELAYED_CONSOLE_HANDLE)) {
if (!CloseHandle(rfd->fd)) {
ok = 0;
if (set_error)
get_windows_error();
}
}
#endif
if (ok || !set_error)
free(rfd);
return ok;
}
rktio_ok_t rktio_close(rktio_t *rktio, rktio_fd_t *rfd)
{
return do_close(rktio, rfd, 1);
}
void rktio_close_noerr(rktio_t *rktio, rktio_fd_t *rfd)
{
(void)do_close(rktio, rfd, 0);
}
rktio_ok_t rktio_internal_close(rktio_t *rktio /* may be NULL */, rktio_fd_t *rfd, int set_error)
{
return do_close(rktio, rfd, set_error);
}
void rktio_forget(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_WINDOWS_SYSTEM
deinit_fd(rfd, 1);
#endif
free(rfd);
}
/*========================================================================*/
/* detach, attach, and abandon */
/*========================================================================*/
rktio_fd_transfer_t *rktio_fd_detach(rktio_t *rktio, rktio_fd_t *rfd)
{
#ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending)
rktio_pending_open_detach(rktio, rfd->pending);
#endif
return (rktio_fd_transfer_t *)rfd;
}
rktio_fd_t *rktio_fd_attach(rktio_t *rktio, rktio_fd_transfer_t *rfdt)
{
rktio_fd_t *rfd = (rktio_fd_t *)rfdt;
#ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending)
rktio_pending_open_attach(rktio, rfd->pending);
#endif
return rfd;
}
void rktio_fd_close_transfer(rktio_fd_transfer_t *rfdt)
{
(void)do_close(NULL, (rktio_fd_t *)rfdt, 0);
}
/*========================================================================*/
/* polling */
/*========================================================================*/
#ifdef SOME_FDS_ARE_NOT_SELECTABLE
static int try_get_fd_char(int fd, int *ready)
{
int old_flags, c;
unsigned char buf[1];
old_flags = fcntl(fd, F_GETFL, 0);
if (!(old_flags & RKTIO_NONBLOCKING))
fcntl(fd, F_SETFL, old_flags | RKTIO_NONBLOCKING);
do {
c = read(fd, buf, 1);
} while ((c == -1) && errno == EINTR);
if (!(old_flags & RKTIO_NONBLOCKING))
fcntl(fd, F_SETFL, old_flags);
if (c < 0) {
*ready = 0;
return 0;
} else {
*ready = 1;
if (!c)
return RKTIO_READ_EOF;
else
return buf[0];
}
}
#endif
int rktio_poll_read_ready(rktio_t *rktio, rktio_fd_t *rfd)
{
if (rktio_fd_is_regular_file(rktio, rfd))
return RKTIO_POLL_READY;
#ifdef RKTIO_SYSTEM_UNIX
{
int r;
# ifdef SOME_FDS_ARE_NOT_SELECTABLE
if (rfd->bufcount)
return RKTIO_POLL_READY;
# endif
# ifdef HAVE_POLL_SYSCALL
struct pollfd pfd[1];
pfd[0].fd = rfd->fd;
pfd[0].events = POLLIN;
do {
r = poll(pfd, 1, 0);
} while ((r == -1) && (errno == EINTR));
# else
DECL_FDSET(readfds, 1);
DECL_FDSET(exnfds, 1);
struct timeval time = {0, 0};
INIT_DECL_RD_FDSET(readfds);
INIT_DECL_ER_FDSET(exnfds);
RKTIO_FD_ZERO(readfds);
RKTIO_FD_ZERO(exnfds);
RKTIO_FD_SET(rfd->fd, readfds);
RKTIO_FD_SET(rfd->fd, exnfds);
do {
r = select(rfd->fd + 1, RKTIO_FDS(readfds), NULL, RKTIO_FDS(exnfds), &time);
} while ((r == -1) && (errno == EINTR));
# endif
# ifdef SOME_FDS_ARE_NOT_SELECTABLE
/* Try a non-blocking read: */
if (!r && !(rfd->modes & RKTIO_OPEN_SOCKET)) {
int c, ready;
c = try_get_fd_char(rfd->fd, &ready);
if (ready) {
if (c != RKTIO_READ_EOF) {
rfd->buffer[0] = (unsigned char)c;
rfd->bufcount = 1;
}
r = 1;
}
}
# endif
return r != 0;
}
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_SOCKET)
return rktio_socket_poll_read_ready(rktio, rfd);
init_read_fd(rktio, rfd);
if (rfd->leftover_len)
return RKTIO_POLL_READY;
if (!rfd->th) {
/* No thread, so use wait. See `USE_BACKGROUND_THREAD_FOR_CONSOLE_INPUT`
for why this isn't ready right for console handles. */
if (WaitForSingleObject(rfd->fd, 0) == WAIT_OBJECT_0)
return RKTIO_POLL_READY;
} else {
/* Has the reader thread pulled in data? */
WaitForSingleObject(rfd->th->lock_sema, INFINITE);
if (rfd->th->checking) {
/* The thread is still trying.
Clean up any signals that we may have ignored before. */
WaitForSingleObject(rfd->th->ready_sema, 0);
} else if (rfd->th->avail || rfd->th->err || rfd->th->eof) {
ReleaseSemaphore(rfd->th->lock_sema, 1, NULL);
return RKTIO_POLL_READY; /* other thread found data */
} else {
/* Doesn't have anything, and it's not even looking. Tell it
to look: */
rfd->th->checking = 1;
ReleaseSemaphore(rfd->th->checking_sema, 1, NULL);
}
ReleaseSemaphore(rfd->th->lock_sema, 1, NULL);
}
return 0;
#endif
}
int poll_write_ready_or_flushed(rktio_t *rktio, rktio_fd_t *rfd, int check_flushed)
{
#ifdef RKTIO_SYSTEM_UNIX
if (check_flushed)
return RKTIO_POLL_READY;
else {
int sr;
# ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending) {
int errval = rktio_pending_open_poll(rktio, rfd, rfd->pending);
if (errval) {
errno = errval;
get_posix_error();
return RKTIO_POLL_ERROR;
} else if (rfd->pending)
return RKTIO_POLL_NOT_READY;
}
# endif
# ifdef HAVE_POLL_SYSCALL
struct pollfd pfd[1];
pfd[0].fd = rfd->fd;
pfd[0].events = POLLOUT;
do {
sr = poll(pfd, 1, 0);
} while ((sr == -1) && (errno == EINTR));
# else
DECL_FDSET(writefds, 1);
DECL_FDSET(exnfds, 1);
struct timeval time = {0, 0};
INIT_DECL_WR_FDSET(writefds);
INIT_DECL_ER_FDSET(exnfds);
RKTIO_FD_ZERO(writefds);
RKTIO_FD_ZERO(exnfds);
RKTIO_FD_SET(rfd->fd, writefds);
RKTIO_FD_SET(rfd->fd, exnfds);
do {
/* Mac OS X 10.8 and 10.9: select() seems to claim that a pipe
is always ready for output. To work around that problem,
kqueue() support might be used for pipes, but that has different
problems. The pol() code above should be used, instead. */
sr = select(rfd->fd + 1, NULL, RKTIO_FDS(writefds), RKTIO_FDS(exnfds), &time);
} while ((sr == -1) && (errno == EINTR));
# endif
if (sr == -1) {
get_posix_error();
return RKTIO_POLL_ERROR;
} else
return (sr != 0);
}
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->fd == DELAYED_CONSOLE_HANDLE)
return RKTIO_POLL_READY;
if (rfd->modes & RKTIO_OPEN_SOCKET) {
if (check_flushed)
return RKTIO_POLL_READY;
return rktio_socket_poll_write_ready(rktio, rfd);
}
if (rfd->oth) {
/* Pipe output that can block or needs a background flush */
int retval;
Win_FD_Output_Thread *oth = rfd->oth;
if (check_flushed && rfd->oth->nonblocking) {
/* Not Windows 95, so any written data really is in the pipe, as
good as flushed, and we don't really need to ask the thread. */
return RKTIO_POLL_READY;
}
WaitForSingleObject(oth->lock_sema, INFINITE);
if (oth->nonblocking) {
if (oth->needflush) {
oth->needflush = 0;
oth->flushed = 0;
ReleaseSemaphore(oth->work_sema, 1, NULL); /* start trying to flush */
retval = 0;
} else
retval = oth->flushed;
if (!retval) {
/* While we hold the lock, clear any leftover notifications */
WaitForSingleObject(oth->ready_sema, 0);
}
} else {
/* Using separate writing thread for Windows 95 */
if (oth->err_no) {
/* Delay error report until next write */
retval = 1;
} else
retval = (check_flushed
? !oth->buflen
: (oth->buflen < RKTIO_FD_BUFFSIZE));
if (!retval && !check_flushed) {
/* clear any leftover notifications */
WaitForSingleObject(oth->ready_sema, 0);
}
}
ReleaseSemaphore(oth->lock_sema, 1, NULL);
return (retval ? RKTIO_POLL_READY : 0);
} else
return RKTIO_POLL_READY; /* non-blocking output, such as a console, or haven't written yet */
#endif
}
int rktio_poll_write_ready(rktio_t *rktio, rktio_fd_t *rfd)
{
return poll_write_ready_or_flushed(rktio, rfd, 0);
}
int rktio_poll_write_flushed(rktio_t *rktio, rktio_fd_t *rfd)
{
return poll_write_ready_or_flushed(rktio, rfd, 1);
}
void rktio_poll_add(rktio_t *rktio, rktio_fd_t *rfd, rktio_poll_set_t *fds, int modes)
{
#ifdef RKTIO_SYSTEM_UNIX
rktio_poll_set_t *fds2;
# ifdef RKTIO_USE_PENDING_OPEN
if (rfd->pending) {
rktio_poll_add_pending_open(rktio, rfd, rfd->pending, fds);
return;
}
# endif
if (modes & RKTIO_POLL_READ) {
RKTIO_FD_SET(rfd->fd, fds);
}
if (modes & RKTIO_POLL_WRITE) {
fds2 = RKTIO_GET_FDSET(fds, 1);
RKTIO_FD_SET(rfd->fd, fds2);
}
fds2 = RKTIO_GET_FDSET(fds, 2);
RKTIO_FD_SET(rfd->fd, fds2);
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_SOCKET) {
/* RKTIO_FD_SET(), etc., for Windows expects sockets */
rktio_poll_set_t *fds2;
if (modes & RKTIO_POLL_READ) {
RKTIO_FD_SET((intptr_t)rfd->sock, fds);
}
if (modes & RKTIO_POLL_WRITE) {
fds2 = RKTIO_GET_FDSET(fds, 1);
RKTIO_FD_SET((intptr_t)rfd->sock, fds2);
}
fds2 = RKTIO_GET_FDSET(fds, 2);
RKTIO_FD_SET((intptr_t)rfd->sock, fds2);
} else {
force_console(rfd);
if (modes & RKTIO_POLL_READ) {
init_read_fd(rktio, rfd);
if (rfd->th) {
WaitForSingleObject(rfd->th->lock_sema, INFINITE);
if (!rfd->th->checking) {
if (rfd->th->avail || rfd->th->err || rfd->th->eof) {
/* Data is ready. We shouldn't be trying to sleep, so force an
immediate wake-up: */
ReleaseSemaphore(rfd->th->lock_sema, 1, NULL);
rktio_poll_set_add_nosleep(rktio, fds);
} else {
/* Ask the reader thread to start checking for data */
rfd->th->checking = 1;
ReleaseSemaphore(rfd->th->checking_sema, 1, NULL);
/* clear any notifications that we may have ignored before */
WaitForSingleObject(rfd->th->ready_sema, 0);
ReleaseSemaphore(rfd->th->lock_sema, 1, NULL);
rktio_poll_set_add_handle(rktio, (intptr_t)rfd->th->ready_sema, fds, 1);
}
} else {
ReleaseSemaphore(rfd->th->lock_sema, 1, NULL);
rktio_poll_set_add_handle(rktio, (intptr_t)rfd->th->ready_sema, fds, 1);
}
} else if (rktio_fd_is_regular_file(rktio, rfd)) {
/* regular files never block */
rktio_poll_set_add_nosleep(rktio, fds);
} else {
/* We get here for console input with
USE_BACKGROUND_THREAD_FOR_CONSOLE_INPUT is 0, for
example. */
if (rfd->leftover_len)
rktio_poll_set_add_nosleep(rktio, fds);
else {
/* This is not really right for consoles.
See `USE_BACKGROUND_THREAD_FOR_CONSOLE_INPUT`. */
rktio_poll_set_add_handle(rktio, (intptr_t)rfd->fd, fds, 0);
}
}
}
if (modes & RKTIO_POLL_WRITE) {
if (rfd->oth && !rktio_poll_write_ready(rktio, rfd))
rktio_poll_set_add_handle(rktio, (intptr_t)rfd->oth->ready_sema, fds, 1);
else
rktio_poll_set_add_nosleep(rktio, fds);
}
if (modes & RKTIO_POLL_FLUSH) {
if (rfd->oth && !rktio_poll_write_flushed(rktio, rfd))
rktio_poll_set_add_handle(rktio, (intptr_t)rfd->oth->ready_sema, fds, 1);
else
rktio_poll_set_add_nosleep(rktio, fds);
}
}
#endif
}
/*========================================================================*/
/* reading */
/*========================================================================*/
intptr_t rktio_read_converted(rktio_t *rktio, rktio_fd_t *rfd, char *buffer, intptr_t len,
char *is_converted)
{
#ifdef RKTIO_SYSTEM_UNIX
intptr_t bc;
if (rfd->modes & RKTIO_OPEN_SOCKET)
return rktio_socket_read(rktio, rfd, buffer, len);
# ifdef SOME_FDS_ARE_NOT_SELECTABLE
if (rfd->bufcount && len) {
buffer[0] = rfd->buffer[0];
rfd->bufcount = 0;
return 1;
}
# endif
len = LIMIT_REQUEST_SIZE(len);
if (rktio_fd_is_regular_file(rktio, rfd)) {
/* Reading regular file never blocks */
do {
bc = read(rfd->fd, buffer, len);
} while ((bc == -1) && (errno == EINTR));
if (bc == -1) {
get_posix_error();
return RKTIO_READ_ERROR;
} else if (bc == 0)
return RKTIO_READ_EOF;
else
return bc;
} else {
int old_flags;
/* Check that input is available. This step is needed
for fifos to avoid getting an EOF-looking result
if there's no writer, yet. */
if (!rktio_poll_read_ready(rktio, rfd))
return 0;
old_flags = fcntl(rfd->fd, F_GETFL, 0);
if (!(old_flags & RKTIO_NONBLOCKING))
fcntl(rfd->fd, F_SETFL, old_flags | RKTIO_NONBLOCKING);
/* We use a non-blocking read here, even though we've waited
for input above, because an external process might have
gobbled the characters that we expected to get. */
do {
bc = read(rfd->fd, buffer, len);
} while ((bc == -1) && errno == EINTR);
if ((bc == -1) && (errno != EAGAIN))
get_posix_error();
if (!(old_flags & RKTIO_NONBLOCKING))
fcntl(rfd->fd, F_SETFL, old_flags);
if (bc == -1) {
if (errno == EAGAIN)
return 0; /* no bytes from a non-blocking read */
else
return RKTIO_READ_ERROR;
} else if (bc == 0)
return RKTIO_READ_EOF;
else
return bc;
}
#endif
#ifdef RKTIO_SYSTEM_WINDOWS
if (rfd->modes & RKTIO_OPEN_SOCKET)
return rktio_socket_read(rktio, rfd, buffer, len);