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win32: Support overlapped (asynchronous) I/O on standard streams in GSFileHandle

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* win32: Support overlapped I/O on standard streams in GSFileHandle

* Add isStandardInput instance variable

* Restrict PeekConsoleInput on stdin

* Update ChangeLog
This commit is contained in:
Hugo Melder 2022-08-23 18:43:14 +02:00 • committed by GitHub
parent 6b537b4a45
commit 32eb5d2acd
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 100 additions and 25 deletions
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111
Source/win32/GSFileHandle.m
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@ -1065,6 +1065,7 @@ NSString * const GSSOCKSRecvAddr = @"GSSOCKSRecvAddr";
if (self)
{
readOK = NO;
isStandardStream = YES;
}
}
return self;
@ -1083,6 +1084,8 @@ NSString * const GSSOCKSRecvAddr = @"GSSOCKSRecvAddr";
if (self)
{
writeOK = NO;
isStandardStream = YES;
isStandardInput = YES;
}
}
return self;
@ -1101,6 +1104,7 @@ NSString * const GSSOCKSRecvAddr = @"GSSOCKSRecvAddr";
if (self)
{
readOK = NO;
isStandardStream = YES;
}
}
return self;
@ -1158,8 +1162,7 @@ NSString * const GSSOCKSRecvAddr = @"GSSOCKSRecvAddr";
{
if (GetFileType(h) == FILE_TYPE_PIPE)
{
/* If we can't get named pipe info, we assume this is a socket.
*/
// If we can't get named pipe info, we assume this is a socket.
if (GetNamedPipeInfo(h, 0, 0, 0, 0) == 0)
{
isSocket = YES;
@ -2089,33 +2092,87 @@ NSString * const GSSOCKSRecvAddr = @"GSSOCKSRecvAddr";
}
else
{
HANDLE h;
h = (HANDLE)_get_osfhandle(descriptor);
/* Overlapped (asynchronous) I/O on a standard stream requires
* a different interface to that of a pipe.
*
* Opening a standard stream ("CONIN$", "CONOUT$", "CONERR$") via
* CreateFile() with the FILE_FLAG_OVERLAPPED flag has no effect
* on the handle; the parameter dwFlagsAndAttributes is ignored when
* creating a standard stream handle.
*
* A Windows standard stream is not an anonymous or named pipe and
* PeekNamedPipe is therefore not supported. Instead, PeekConsoleInput
* is used to "peek" into the standard stream.
*/
if (YES == isStandardInput && YES == isStandardStream)
{
/* Stores the number of input records read
*/
DWORD bytes = 0;
/* PeekConsoleInput fails, if it returns a non-zero value.
*/
if (PeekConsoleInput(h, 0, 0, &bytes) == 0)
{
DWORD e = GetLastError();
NSString *s;
s = [NSString stringWithFormat: @"Standard input peek problem: %lu - %@", e,
[NSError _last]];
[readInfo setObject: s forKey: GSFileHandleNotificationError];
NSLog(@"%@", s);
return;
}
else if (bytes == 0)
{
return; // No data available yet.
}
}
else if (NO == isStandardInput && YES == isStandardStream) {
NSString *s;
s = @"Reading from stdout and stderr is not available.";
[readInfo setObject: s forKey: GSFileHandleNotificationError];
NSLog(@"%@", s);
return;
}
/* If this is not a socket or a standard file, we assume it's a pipe
* and therefore we need to check to see if data really is available.
*/
if (NO == isSocket && NO == isStandardFile)
{
HANDLE h = (HANDLE)_get_osfhandle(descriptor);
DWORD bytes = 0;
else if (NO == isSocket && NO == isStandardFile)
{
DWORD bytes = 0;
if (PeekNamedPipe(h, 0, 0, 0, &bytes, 0) == 0)
{
DWORD e = GetLastError();
if (PeekNamedPipe(h, 0, 0, 0, &bytes, 0) == 0)
{
DWORD e = GetLastError();
if (e != ERROR_BROKEN_PIPE && e != ERROR_HANDLE_EOF)
{
NSLog(@"pipe peek problem %lu: %@", e, [NSError _last]);
return;
}
/* In the case of a broken pipe, we fall through so that a read
* attempt is performed allowing higer level code to notice the
* problem and deal with it.
*/
}
else if (bytes == 0)
{
return; // No data available yet.
}
}
{
NSString *s;
s = [NSString stringWithFormat: @"pipe peek problem: %lu - %@", e,
[NSError _last]];
[readInfo setObject: s forKey: GSFileHandleNotificationError];
NSLog(@"%@", s);
return;
}
/* In the case of a broken pipe, we fall through so that a read
* attempt is performed allowing higer level code to notice the
* problem and deal with it.
*/
}
else if (bytes == 0)
{
return; // No data available yet.
}
}
if (operation == NSFileHandleDataAvailableNotification)
{
@ -2417,6 +2474,14 @@ NSString * const GSSOCKSRecvAddr = @"GSSOCKSRecvAddr";
{
return;
}
/* Invoking SetNamedPipeHandleState on a standard stream results in an
* ERROR_INVALID_FUNCTION (1) error message. Proceed only if the
* file descriptor is not a standard stream.
*/
else if (isStandardStream == YES)
{
return;
}
else if (isNonBlocking == flag)
{
return;