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mingw: make isatty() recognize MSYS2's pseudo terminals (/dev/pty*)

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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 MSYS2's
ptys (such as mintty).

However, MSYS2 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 <blees@dcon.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karsten Blees
2016-04-27 17:16:37 +02:00
committed by Junio C Hamano
parent 0f8e831356
commit f7f90e0f4f
2 changed files with 56 additions and 5 deletions
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config.mak.uname
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@ -557,7 +557,8 @@ 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 -DDETECT_MSYS_TTY
EXTLIBS += -lntdll
INSTALL = /bin/install
NO_R_TO_GCC_LINKER = YesPlease
INTERNAL_QSORT = YesPlease