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Make stdin pollable on Windows

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You can now play Super Mario Bros in CMD.EXE using Cosmopolitan! This is
thanks to a new worker thread that's spawned on Windows whenever any one
of poll(), select(), or ioctl(FIONREAD) is linked.
This commit is contained in:
Justine Tunney 2023-08-13 22:42:25 -07:00
parent ef6387ee5e
commit 9c0821def7
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
15 changed files with 280 additions and 58 deletions
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52
libc/calls/ioctl.c
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@ -18,7 +18,9 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/calls/termios.h"
#include "libc/dce.h"
#include "libc/errno.h"
@ -29,7 +31,10 @@
#include "libc/macros.internal.h"
#include "libc/mem/alloca.h"
#include "libc/mem/mem.h"
#include "libc/nt/enum/filetype.h"
#include "libc/nt/errors.h"
#include "libc/nt/files.h"
#include "libc/nt/ipc.h"
#include "libc/nt/iphlpapi.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/ipadapteraddresses.h"
@ -48,6 +53,10 @@
#include "libc/sysv/consts/termios.h"
#include "libc/sysv/errfuns.h"
#ifdef __x86_64__
__static_yoink("WinMainStdin");
#endif
/* Maximum number of unicast addresses handled for each interface */
#define MAX_UNICAST_ADDR 32
#define MAX_NAME_CLASH ((int)('z' - 'a')) /* Allow a..z */
@ -61,14 +70,10 @@ static struct HostAdapterInfoNode {
short flags;
} * __hostInfo;
static int ioctl_default(int fd, unsigned long request, ...) {
static int ioctl_default(int fd, unsigned long request, void *arg) {
int rc;
void *arg;
va_list va;
int64_t handle;
va_start(va, request);
arg = va_arg(va, void *);
va_end(va);
if (!IsWindows()) {
return sys_ioctl(fd, request, arg);
} else if (__isfdopen(fd)) {
@ -87,6 +92,36 @@ static int ioctl_default(int fd, unsigned long request, ...) {
}
}
static int ioctl_fionread(int fd, uint32_t *arg) {
int rc;
va_list va;
int64_t handle;
uint32_t avail;
if (!IsWindows()) {
return sys_ioctl(fd, FIONREAD, arg);
} else if (__isfdopen(fd)) {
handle = __resolve_stdin_handle(g_fds.p[fd].handle);
if (g_fds.p[fd].kind == kFdSocket) {
if ((rc = _weaken(__sys_ioctlsocket_nt)(handle, FIONREAD, arg)) != -1) {
return rc;
} else {
return _weaken(__winsockerr)();
}
} else if (GetFileType(handle) == kNtFileTypePipe) {
if (PeekNamedPipe(handle, 0, 0, 0, &avail, 0)) {
*arg = avail;
return 0;
} else {
return __winerr();
}
} else {
return eopnotsupp();
}
} else {
return ebadf();
}
}
/* Frees all the nodes of the _hostInfo */
static textwindows void freeHostInfo(void) {
struct HostAdapterInfoNode *next, *node = __hostInfo;
@ -564,8 +599,7 @@ static int ioctl_siocgifflags(int fd, void *arg) {
* @param request can be any of:
*
* - `FIONREAD` takes an `int *` and returns how many bytes of input
* are available on a terminal or socket, waiting to be read. On
* Windows this currently won't work for console file descriptors.
* are available on a terminal or socket, waiting to be read.
*
* - `TIOCGWINSZ` populates `struct winsize *` with the dimensions
* of your teletypewriter. It's an alias for tcgetwinsize().
@ -635,8 +669,8 @@ int ioctl(int fd, unsigned long request, ...) {
va_start(va, request);
arg = va_arg(va, void *);
va_end(va);
if (request == FIONBIO) {
rc = ioctl_default(fd, request, arg);
if (request == FIONREAD) {
rc = ioctl_fionread(fd, arg);
} else if (request == TIOCGWINSZ) {
rc = tcgetwinsize(fd, arg);
} else if (request == TIOCSWINSZ) {