mingw: make isatty() recognize MSys pseudo terminals (/dev/pty*)

MSys2 emulates pseudo terminals via named pipes, and isatty() returns 0
for such file descriptors. Therefore, some interactive functionality (such
as launching a pager, asking if a failed unlink should be repeated etc.)
doesn't work when run in a terminal emulator that uses MSys ptys (such as
mintty).

However, MSys uses special names for its pty pipes ('msys-*-pty*'), which
allows us to distinguish them from normal piped input / output.

On startup, check if stdin / stdout / stderr are connected to such pipes
using the NtQueryObject API from NTDll.dll. If the names match, adjust the
flags in MSVCRT's ioinfo structure accordingly.

Signed-off-by: Karsten Blees <[email protected]>

Author: kblees

compat/winansi.c

@@ -7,6 +7,11 @@
 #include <wingdi.h>
 #include <winreg.h>
 
+#ifdef USE_NTDLL
+#include <winternl.h>
+#include <ntstatus.h>
+#endif
+
 /*
  ANSI codes used by git: m, K
 
@@ -483,6 +488,7 @@ static size_t sizeof_ioinfo = 0;
 #define IOINFO_L2E 5
 #define IOINFO_ARRAY_ELTS (1 << IOINFO_L2E)
 
+#define FPIPE 0x08
 #define FDEV  0x40
 
 static inline ioinfo* _pioinfo(int fd)
@@ -530,6 +536,44 @@ static HANDLE swap_osfhnd(int fd, HANDLE new_handle)
 	return old_handle;
 }
 
+#ifdef USE_NTDLL
+
+static void msystty_init(int fd)
+{
+	ULONG result;
+	BYTE buffer[1024];
+	POBJECT_NAME_INFORMATION nameinfo = (POBJECT_NAME_INFORMATION) buffer;
+	PWSTR name;
+
+	/* check if fd is a pipe */
+	HANDLE h = (HANDLE) _get_osfhandle(fd);
+	if (GetFileType(h) != FILE_TYPE_PIPE)
+		return;
+
+	/* get pipe name */
+	if (!NT_SUCCESS(NtQueryObject(h, ObjectNameInformation,
+			buffer, sizeof(buffer) - 2, &result)))
+		return;
+	name = nameinfo->Name.Buffer;
+	name[nameinfo->Name.Length] = 0;
+
+	/* check if this could be a msys pty pipe ('msys-XXXX-ptyN-XX') */
+	if (!wcsstr(name, L"msys-") || !wcsstr(name, L"-pty"))
+		return;
+
+	/* init ioinfo size if we haven't done so */
+	if (init_sizeof_ioinfo())
+		return;
+
+	/* set FDEV flag, reset FPIPE flag */
+	_pioinfo(fd)->osflags &= ~FPIPE;
+	_pioinfo(fd)->osflags |= FDEV;
+}
+
+#else
+#define msystty_init(fd) (void)0
+#endif
+
 void winansi_init(void)
 {
 	int con1, con2;
@@ -538,8 +582,13 @@ void winansi_init(void)
 	/* check if either stdout or stderr is a console output screen buffer */
 	con1 = is_console(1);
 	con2 = is_console(2);
-	if (!con1 && !con2)
+	if (!con1 && !con2) {
+		/* check if stdin / stdout / stderr are msys pty pipes */
+		msystty_init(0);
+		msystty_init(1);
+		msystty_init(2);
 		return;
+	}
 
 	/* create a named pipe to communicate with the console thread */
 	sprintf(name, "\\\\.\\pipe\\winansi%lu", GetCurrentProcessId());
@@ -575,8 +624,11 @@ void winansi_init(void)
 HANDLE winansi_get_osfhandle(int fd)
 {
 	HANDLE hnd = (HANDLE) _get_osfhandle(fd);
-	if ((fd == 1 || fd == 2) && isatty(fd)
-	    && GetFileType(hnd) == FILE_TYPE_PIPE)
-		return (fd == 1) ? hconsole1 : hconsole2;
+	if (isatty(fd) && GetFileType(hnd) == FILE_TYPE_PIPE) {
+		if (fd == 1 && hconsole1)
+			return hconsole1;
+		else if (fd == 2 && hconsole2)
+			return hconsole2;
+	}
 	return hnd;
 }

config.mak.uname

@@ -548,7 +548,8 @@ else
 			BASIC_LDFLAGS += -Wl,--large-address-aware
 		endif
 		CC = gcc
-		COMPAT_CFLAGS += -D__USE_MINGW_ANSI_STDIO=0
+		COMPAT_CFLAGS += -D__USE_MINGW_ANSI_STDIO=0 -DUSE_NTDLL
+		EXTLIBS += -lntdll
 		INSTALL = /bin/install
 		NO_R_TO_GCC_LINKER = YesPlease
 		INTERNAL_QSORT = YesPlease