GitHub - hiyuh/cygwin-stackdump-example

about cygwin_stackdump():

cygwin_stackdump() creates a file named executable's plus suffixed .stackdump.
cygwin_stackdump() writes simple stack trace which are constructed by frame,
function and args in hex notation.
fopen() stackdump file immediately after cygwin_stackdump() calling in signle
process will fail, so use fork() and waitpid().
cygwin has clang-3.1 as most recent version.
w/ 3.1, DWARF part looks broken, so unable to use addr2line to decode.
do not use cygwin_stackdump() for new code.
Christopher Faylor said:
"Exporting this function is an ancient mistake but we are stuck with
keeping it around to maintain backwards compatibility. There is
no guarantee that the stackdump you get from this is correct and
we have no plans on augmenting it further."
http://cygwin.com/ml/cygwin/2014-01/msg00056.html
cygwin_stackdump() can not dump stack correctly in signal handler.

about unwind.h:

cygwin has clang-3.1 as most recent version.
w/ clang-3.1, DWARF part looks broken, so unable to use addr2line to decode.
w/ clang-3.1, only _Unwind_GetIP() and _Unwind_Backtrace() are supported.
as upstream version, see http://clang.llvm.org/doxygen/unwind_8h.html.
using _Unwind_GetIP() only via _Unwind_Backtrace(), it can not dump stack
correctly in signal handler.

about signal handler:

SA_SIGINFO is not supported properly on cygwin ATM.
according to _cygtls::call_signal_handler() in winsup/cygwin/exception.cc,
the 3rd argument of signal handler is NULL even if SA_SIGINFO was set.
http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/cygwin/exceptions.cc?rev=1.432&content-type=text/x-cvsweb-markup&cvsroot=src
FYI, following code project looks promising:
http://www.codeproject.com/Articles/4225/Unix-ucontext_t-Operations-on-Windows-Platforms

$ uname -a
CYGWIN_NT-5.1 jabberwocky 1.7.27(0.271/5/3) 2013-12-09 11:57 i686 Cygwin

$ make CC=gcc clean info check
rm -f test-cygwin_stackdump.exe
rm -f test-cygwin_stackdump.exe.stackdump
rm -f test-cygwin_stackdump-signal.exe
rm -f test-cygwin_stackdump-signal.exe.stackdump
rm -f test-cygwin_stackdump-fork-waitpid.exe
rm -f test-cygwin_stackdump-fork-waitpid.exe.stackdump
rm -f test-cygwin_stackdump-fork-waitpid-signal.exe
rm -f test-cygwin_stackdump-fork-waitpid-signal.exe.stackdump
rm -f test-unwind.exe
rm -f test-unwind.exe.stackdump
rm -f test-unwind-signal.exe
rm -f test-unwind-signal.exe.stackdump
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-cygwin/4.8.2/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/gcc4/gcc-4.8.2-2/src/gcc-4.8.2/configure --srcdir=/cygdrive/i/szsz/tmpp/gcc4/gcc-4.8.2-2/src/gcc-4.8.2 --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C --build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --disable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic --disable-sjlj-exceptions --enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-libada --enable-libjava --enable-libgcj-sublibs --disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --with-system-zlib --libexecdir=/usr/lib
Thread model: posix
gcc version 4.8.2 (GCC)
gcc -DUSE_CYGWIN_STACKDUMP -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump.exe test.c
gcc -DUSE_CYGWIN_STACKDUMP -DUSE_SIGNAL -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump-signal.exe test.c
gcc -DUSE_CYGWIN_STACKDUMP -DUSE_FORK_WAITPID -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump-fork-waitpid.exe test.c
gcc -DUSE_CYGWIN_STACKDUMP -DUSE_FORK_WAITPID -DUSE_SIGNAL -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump-fork-waitpid-signal.exe test.c
gcc -DUSE_UNWIND -g -O0 -std=gnu99 -Wall -funwind-tables -o test-unwind.exe test.c
gcc -DUSE_UNWIND -DUSE_SIGNAL -g -O0 -std=gnu99 -Wall -funwind-tables -o test-unwind-signal.exe test.c
./test-cygwin_stackdump.exe || true
fopen: Device or resource busy
/bin/sh: line 1:  2832 Aborted                 (core dumped) ./test-cygwin_stackdump.exe
./test-cygwin_stackdump.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump.exe || true
./test-cygwin_stackdump-signal.exe || true
fopen: Device or resource busy
/bin/sh: line 1:  4000 Aborted                 (core dumped) ./test-cygwin_stackdump-signal.exe
./test-cygwin_stackdump-signal.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump-signal.exe || true
./test-cygwin_stackdump-fork-waitpid.exe
Stack trace:
Frame     Function  Args
0022ABC8  00401374 (20000008, 00401A10, 0022ABE8, 00401390)
0022ABD8  00401382 (00000000, 00000000, 0022ABF8, 0040139E)
0022ABE8  00401390 (00401A10, 00401A10, 0022AC08, 004013AC)
0022ABF8  0040139E (611882B0, 7FFDDC00, 0022AC18, 004013BA)
0022AC08  004013AC (7C80B760, 00000000, 0022AC28, 004013C8)
0022AC18  004013BA (00000000, 610063A0, 0022AC38, 004013D6)
0022AC28  004013C8 (00401A14, 00401A10, 0022AC48, 004013E4)
0022AC38  004013D6 (610063A0, 6119EF5B, 0022AC58, 004013F2)
0022AC48  004013E4 (0000002F, 0022AC8C, 0022AC68, 0040140F)
0022AC58  004013F2 (00000000, 0022CDB4, 0022AD28, 61007FB5)
0022AC68  0040140F (00000001, 0022AC8C, 20010100, 61007F58)
0022AD28  61007FB5 (00000000, 0022CDB4, 61007120, 00000000)
End of stack trace
./test-cygwin_stackdump-fork-waitpid.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump-fork-waitpid.exe
f9
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:119
f8
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:120
f7
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:121
f6
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:122
f5
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:123
f4
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:124
f3
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:125
f2
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:126
f1
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:127
f0
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:128
main
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:165
??
??:0
./test-cygwin_stackdump-fork-waitpid-signal.exe
Stack trace:
Frame     Function  Args
./test-cygwin_stackdump-fork-waitpid-signal.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump-fork-waitpid-signal.exe
./test-unwind.exe
#14: 00401225
#14: 00401288
#14: 00401296
#14: 004012a4
#14: 004012b2
#14: 004012c0
#14: 004012ce
#14: 004012dc
#14: 004012ea
#14: 004012f8
#14: 00401306
#14: 00401314
#14: 00401327
#14: 61007fb5
./test-unwind.exe 2>&1 | awk '{ print $2 }' | addr2line -f -e ./test-unwind.exe
show_stackdump
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:92
f10
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:112
f9
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:119
f8
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:120
f7
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:121
f6
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:122
f5
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:123
f4
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:124
f3
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:125
f2
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:126
f1
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:127
f0
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:128
main
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:165
??
??:0
./test-unwind-signal.exe
#3: 00401225
#3: 00401339
#3: 6103053e
./test-unwind-signal.exe 2>&1 | awk '{ print $2 }' | addr2line -f -e ./test-unwind-signal.exe
show_stackdump
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:92
signal_handler
/home/hiyuh/git-repos/cygwin-stackdump-example/test.c:144
??
??:0

$ make CC=clang clean info check
rm -f test-cygwin_stackdump.exe
rm -f test-cygwin_stackdump.exe.stackdump
rm -f test-cygwin_stackdump-signal.exe
rm -f test-cygwin_stackdump-signal.exe.stackdump
rm -f test-cygwin_stackdump-fork-waitpid.exe
rm -f test-cygwin_stackdump-fork-waitpid.exe.stackdump
rm -f test-cygwin_stackdump-fork-waitpid-signal.exe
rm -f test-cygwin_stackdump-fork-waitpid-signal.exe.stackdump
rm -f test-unwind.exe
rm -f test-unwind.exe.stackdump
rm -f test-unwind-signal.exe
rm -f test-unwind-signal.exe.stackdump
clang -v
clang version 3.1 (branches/release_31)
Target: i386-pc-cygwin
Thread model: posix
clang -DUSE_CYGWIN_STACKDUMP -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump.exe test.c
clang -DUSE_CYGWIN_STACKDUMP -DUSE_SIGNAL -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump-signal.exe test.c
clang -DUSE_CYGWIN_STACKDUMP -DUSE_FORK_WAITPID -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump-fork-waitpid.exe test.c
clang -DUSE_CYGWIN_STACKDUMP -DUSE_FORK_WAITPID -DUSE_SIGNAL -g -O0 -std=gnu99 -Wall -funwind-tables -o test-cygwin_stackdump-fork-waitpid-signal.exe test.c
clang -DUSE_UNWIND -g -O0 -std=gnu99 -Wall -funwind-tables -o test-unwind.exe test.c
clang -DUSE_UNWIND -DUSE_SIGNAL -g -O0 -std=gnu99 -Wall -funwind-tables -o test-unwind-signal.exe test.c
./test-cygwin_stackdump.exe || true
fopen: Device or resource busy
/bin/sh: line 1:  2068 Aborted                 (core dumped) ./test-cygwin_stackdump.exe
./test-cygwin_stackdump.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump.exe || true
./test-cygwin_stackdump-signal.exe || true
fopen: Device or resource busy
/bin/sh: line 1:  2172 Aborted                 (core dumped) ./test-cygwin_stackdump-signal.exe
./test-cygwin_stackdump-signal.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump-signal.exe || true
./test-cygwin_stackdump-fork-waitpid.exe
Stack trace:
Frame     Function  Args
0022AC0C  00401268 (0022AC1C, 00401248, 0022AC24, 00401238)
0022AC14  00401258 (0022AC24, 00401238, 0022AC2C, 00401228)
0022AC1C  00401248 (0022AC2C, 00401228, 0022AC34, 00401218)
0022AC24  00401238 (0022AC34, 00401218, 0022AC3C, 00401208)
0022AC2C  00401228 (0022AC3C, 00401208, 0022AC44, 004011F8)
0022AC34  00401218 (0022AC44, 004011F8, 0022AC4C, 004011E8)
0022AC3C  00401208 (0022AC4C, 004011E8, 0022AC54, 004011D8)
0022AC44  004011F8 (0022AC54, 004011D8, 0022AC68, 004011BD)
0022AC4C  004011E8 (0022AC68, 004011BD, 0022AC8C, 00000001)
0022AC54  004011D8 (0022AC8C, 00000001, 00000000, 0022AD28)
0022AC68  004011BD (00000001, 0022AC8C, 20010100, 61007F58)
0022AD28  61007FB5 (00000000, 0022CDB4, 61007120, 00000000)
End of stack trace
./test-cygwin_stackdump-fork-waitpid.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump-fork-waitpid.exe
BFD: Dwarf Error: Offset (4263950) greater than or equal to .debug_str size (1405).
BFD: Dwarf Error: Offset (4263990) greater than or equal to .debug_str size (1405).
BFD: Dwarf Error: Offset (4263997) greater than or equal to .debug_str size (1405).
BFD: Dwarf Error: Offset (4260301) greater than or equal to .debug_line size (3477).
??
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./test-cygwin_stackdump-fork-waitpid-signal.exe
Stack trace:
Frame     Function  Args
./test-cygwin_stackdump-fork-waitpid-signal.exe 2>&1 | awk '/^[0-9]/ { print $2 }' | addr2line -f -e ./test-cygwin_stackdump-fork-waitpid-signal.exe
./test-unwind.exe
#14: 004012bf
#14: 00401268
#14: 00401258
#14: 00401248
#14: 00401238
#14: 00401228
#14: 00401218
#14: 00401208
#14: 004011f8
#14: 004011e8
#14: 004011d8
#14: 004011c8
#14: 004011b3
#14: 61007fb5
./test-unwind.exe 2>&1 | awk '{ print $2 }' | addr2line -f -e ./test-unwind.exe
BFD: Dwarf Error: Offset (4263950) greater than or equal to .debug_str size (541).
BFD: Dwarf Error: Offset (4263990) greater than or equal to .debug_str size (541).
BFD: Dwarf Error: Offset (4263997) greater than or equal to .debug_str size (541).
BFD: Dwarf Error: Offset (4260301) greater than or equal to .debug_line size (3442).
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./test-unwind-signal.exe
#3: 0040139f
#3: 0040133d
#3: 6103053e
./test-unwind-signal.exe 2>&1 | awk '{ print $2 }' | addr2line -f -e ./test-unwind-signal.exe
BFD: Dwarf Error: Offset (4263950) greater than or equal to .debug_str size (1013).
BFD: Dwarf Error: Offset (4263990) greater than or equal to .debug_str size (1013).
BFD: Dwarf Error: Offset (4263997) greater than or equal to .debug_str size (1013).
BFD: Dwarf Error: Offset (4260301) greater than or equal to .debug_line size (3513).
??
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??:0

Name		Name	Last commit message	Last commit date
Latest commit History 19 Commits
Makefile		Makefile
README.md		README.md
test.c		test.c

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