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mikesart committed Sep 15, 2021
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2 changes: 2 additions & 0 deletions .gitignore
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_debug/
_release/
23 changes: 23 additions & 0 deletions LICENSE
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The MIT License (MIT)

Copyright 2021 Michael Sartain

All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
119 changes: 119 additions & 0 deletions Makefile
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# $@: name of the target file (one before colon)
# $<: name of first prerequisite file (first one after colon)
# $^: names of all prerequisite files (space separated)
# $*: stem (bit which matches the % wildcard in rule definition)
#
# VAR = val: Normal setting - values within are recursively expand when var used.
# VAR := val: Setting of var with simple expansion of values inside - values are expanded at decl time.
# VAR ?= val: Set var only if it doesn't have a value.
# VAR += val: Append val to existing value (or set if var didn't exist).

# To use static analyzer:
# http://clang-analyzer.llvm.org/scan-build.html
# Ie:
# scan-build -k -V --use-analyzer ~/bin/clang make

NAME = inotify-info

CFG ?= release
ifeq ($(CFG), debug)
ASAN ?= 1
endif

LD = $(CC)
RM = rm -f
MKDIR = mkdir -p
VERBOSE ?= 0

COMPILER = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)

WARNINGS = -Wall -Wextra -Wpedantic -Wmissing-include-dirs -Wformat=2 -Wshadow -Wno-unused-parameter -Wno-missing-field-initializers
ifneq ($(COMPILER),clang)
# https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
WARNINGS += -Wsuggest-attribute=format -Wimplicit-fallthrough=2
endif

# Investigate: Improving C++ Builds with Split DWARF
# http://www.productive-cpp.com/improving-cpp-builds-with-split-dwarf/

CFLAGS = $(WARNINGS) -march=native -fno-exceptions -gdwarf-4 -g2 -ggnu-pubnames -gsplit-dwarf
CFLAGS += -D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64
CXXFLAGS = -fno-rtti -Woverloaded-virtual -Wno-class-memaccess -Wno-pedantic
LDFLAGS = -march=native -gdwarf-4 -g2 -Wl,--build-id=sha1
LIBS = -Wl,--no-as-needed -lm -ldl -lpthread -lstdc++

ifneq ("$(wildcard /usr/bin/ld.gold)","")
$(info Using gold linker...)
LDFLAGS += -fuse-ld=gold -Wl,--gdb-index
endif

CFILES = \
inotify-info.cpp \
lfqueue/lfqueue.c

# Useful GCC address sanitizer checks not enabled by default
# https://kristerw.blogspot.com/2018/06/useful-gcc-address-sanitizer-checks-not.html

ifeq ($(ASAN), 1)
# https://gcc.gnu.org/gcc-5/changes.html
# -fsanitize=float-cast-overflow: check that the result of floating-point type to integer conversions do not overflow;
# -fsanitize=alignment: enable alignment checking, detect various misaligned objects;
# -fsanitize=vptr: enable checking of C++ member function calls, member accesses and some conversions between pointers to base and derived classes, detect if the referenced object does not have the correct dynamic type.
ASAN_FLAGS = -fno-omit-frame-pointer -fno-optimize-sibling-calls
ASAN_FLAGS += -fsanitize=address # fast memory error detector (heap, stack, global buffer overflow, and use-after free)
ASAN_FLAGS += -fsanitize=leak # detect leaks
ASAN_FLAGS += -fsanitize=undefined # fast undefined behavior detector
ASAN_FLAGS += -fsanitize=float-divide-by-zero # detect floating-point division by zero;
ASAN_FLAGS += -fsanitize=bounds # enable instrumentation of array bounds and detect out-of-bounds accesses;
ASAN_FLAGS += -fsanitize=object-size # enable object size checking, detect various out-of-bounds accesses.
CFLAGS += $(ASAN_FLAGS)
LDFLAGS += $(ASAN_FLAGS)
endif

ifeq ($(CFG), debug)
ODIR=_debug
CFLAGS += -O0 -DDEBUG
CFLAGS += -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC -D_GLIBCXX_SANITIZE_VECTOR -D_LIBCPP_DEBUG=1
else
ODIR=_release
CFLAGS += -O2 -DNDEBUG
endif

PROJ = $(ODIR)/$(NAME)
$(info Building $(ODIR)/$(NAME)...)

ifeq ($(VERBOSE), 1)
VERBOSE_PREFIX=
else
VERBOSE_PREFIX=@
endif

C_OBJS = ${CFILES:%.c=${ODIR}/%.o}
OBJS = ${C_OBJS:%.cpp=${ODIR}/%.o}

all: $(PROJ)

$(ODIR)/$(NAME): $(OBJS)
@echo "Linking $@...";
$(VERBOSE_PREFIX)$(LD) $(LDFLAGS) $^ $(LIBS) -o $@

-include $(OBJS:.o=.d)

$(ODIR)/%.o: %.c Makefile
$(VERBOSE_PREFIX)echo "---- $< ----";
@$(MKDIR) $(dir $@)
$(VERBOSE_PREFIX)$(CC) -MMD -MP -std=gnu99 $(CFLAGS) -o $@ -c $<

$(ODIR)/%.o: %.cpp Makefile
$(VERBOSE_PREFIX)echo "---- $< ----";
@$(MKDIR) $(dir $@)
$(VERBOSE_PREFIX)$(CXX) -MMD -MP -std=c++11 $(CFLAGS) $(CXXFLAGS) -o $@ -c $<

.PHONY: clean

clean:
@echo Cleaning...
$(VERBOSE_PREFIX)$(RM) $(PROJ)
$(VERBOSE_PREFIX)$(RM) $(OBJS)
$(VERBOSE_PREFIX)$(RM) $(OBJS:.o=.d)
$(VERBOSE_PREFIX)$(RM) $(OBJS:.o=.dwo)
150 changes: 150 additions & 0 deletions README.md
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# inotify-info

The Linux inotify system has a few issues** and can be difficult to debug.

This app should hopefully help track down how many inotify watches, instances, and what files are being watched.

** https://code.visualstudio.com/docs/setup/linux#_visual-studio-code-is-unable-to-watch-for-file-changes-in-this-large-workspace-error-enospc
*** https://unix.stackexchange.com/questions/15509/whos-consuming-my-inotify-resources

## Build
```
$ make
Building _release/inotify-info...
---- inotify-info.cpp ----
---- lfqueue/lfqueue.c ----
Linking _release/inotify-info...
```
```
$ CFG=debug make
Building _debug/inotify-info...
---- inotify-info.cpp ----
---- lfqueue/lfqueue.c ----
Linking _debug/inotify-info...
```

## Run (Prints Summary)
```
$ _release/inotify-info
------------------------------------------------------------------------------
INotify Limits:
max_queued_events: 16384
max_user_instances: 128
max_user_watches: 65536
------------------------------------------------------------------------------
Pid App Watches Instances
2632 systemd 23 3
2653 pulseaudio 2 2
2656 dbus-daemon 2 1
2987 dbus-daemon 1 1
3056 xfsettingsd 56 1
3068 xfdesktop 10 1
3072 wrapper-2.0 6 1
3091 xfce4-clipman 1 1
3099 xiccd 1 1
3343 xfce4-terminal 1 1
3997 xfce4-appfinder 11 1
4048 xdg-desktop-portal 1 1
4086 xdg-desktop-portal-gtk 56 1
205668 vivaldi-bin 8 1
205705 vivaldi-bin 2 1
------------------------------------------------------------------------------
Total inotify Watches: 181
Total inotify Instances: 18
------------------------------------------------------------------------------
```

## Run with Appname Filter
```
$ _release/inotify-info xfce4
------------------------------------------------------------------------------
INotify Limits:
max_queued_events: 16384
max_user_instances: 128
max_user_watches: 65536
------------------------------------------------------------------------------
Pid App Watches Instances
2632 systemd 23 3
2653 pulseaudio 2 2
2656 dbus-daemon 2 1
2987 dbus-daemon 1 1
3056 xfsettingsd 56 1
3068 xfdesktop 10 1
3072 wrapper-2.0 6 1
3091 xfce4-clipman 1 1
94111050 [10304h]
3099 xiccd 1 1
3343 xfce4-terminal 1 1
71048655 [10304h]
3997 xfce4-appfinder 11 1
94111468 [10304h] 15339430 [10304h] 14554799 [10304h] 70254617 [10304h] 70254684 [10304h] 16786993 [10304h] 14551253 [10304h] 14550430 [10304h] 70254647 [10304h] 70254646 [10304h]
92275589 [10304h]
4048 xdg-desktop-portal 1 1
4086 xdg-desktop-portal-gtk 56 1
205668 vivaldi-bin 8 1
205705 vivaldi-bin 2 1
------------------------------------------------------------------------------
Total inotify Watches: 181
Total inotify Instances: 18
------------------------------------------------------------------------------
Searching '/' for listed inodes... (8 threads)
14550430 [10304h] /usr/share/applications/
14551253 [10304h] /usr/local/share/
14554799 [10304h] /usr/share/xfce4/
15339430 [10304h] /usr/share/desktop-directories/
16786993 [10304h] /usr/share/xfce4/applications/
70254617 [10304h] /home/mikesart/.local/share/
70254646 [10304h] /home/mikesart/.config/menus/
70254647 [10304h] /home/mikesart/.config/menus/applications-merged/
70254684 [10304h] /home/mikesart/.local/share/applications/
71048655 [10304h] /home/mikesart/.config/xfce4/terminal/
92275589 [10304h] /etc/xdg/menus/
94111050 [10304h] /home/mikesart/.config/xfce4/panel/
94111468 [10304h] /home/mikesart/.cache/xfce4/xfce4-appfinder/
```
## Run with Specific Pid(s)
```
$ _release/inotify-info 3997
------------------------------------------------------------------------------
INotify Limits:
max_queued_events: 16384
max_user_instances: 128
max_user_watches: 65536
------------------------------------------------------------------------------
Pid App Watches Instances
2632 systemd 23 3
2653 pulseaudio 2 2
2656 dbus-daemon 2 1
2987 dbus-daemon 1 1
3056 xfsettingsd 56 1
3068 xfdesktop 10 1
3072 wrapper-2.0 6 1
3091 xfce4-clipman 1 1
3099 xiccd 1 1
3343 xfce4-terminal 1 1
3997 xfce4-appfinder 11 1
94111468 [10304h] 15339430 [10304h] 14554799 [10304h] 70254617 [10304h] 70254684 [10304h] 16786993 [10304h] 14551253 [10304h] 14550430 [10304h] 70254647 [10304h] 70254646 [10304h]
92275589 [10304h]
4048 xdg-desktop-portal 1 1
4086 xdg-desktop-portal-gtk 56 1
205668 vivaldi-bin 8 1
205705 vivaldi-bin 2 1
------------------------------------------------------------------------------
Total inotify Watches: 181
Total inotify Instances: 18
------------------------------------------------------------------------------
Searching '/' for listed inodes... (8 threads)
14550430 [10304h] /usr/share/applications/
14551253 [10304h] /usr/local/share/
14554799 [10304h] /usr/share/xfce4/
15339430 [10304h] /usr/share/desktop-directories/
16786993 [10304h] /usr/share/xfce4/applications/
70254617 [10304h] /home/mikesart/.local/share/
70254646 [10304h] /home/mikesart/.config/menus/
70254647 [10304h] /home/mikesart/.config/menus/applications-merged/
70254684 [10304h] /home/mikesart/.local/share/applications/
92275589 [10304h] /etc/xdg/menus/
94111468 [10304h] /home/mikesart/.cache/xfce4/xfce4-appfinder/
```
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