Denys Vlasenko [Wed, 22 Jun 2011 11:03:56 +0000 (13:03 +0200)]
Make strace_popen abort on error
It makes no sense to postpone abort on strace_popen error
unti it returns. Moreover, out-of-memory error was exiting
without any message.
While at it, use 0 as "none" for popen_pid, as optimization.
* strace: Initialize popen_pid to 0 - this puts it in bss.
(trace): Reset popen_pid to 0 instead of -1.
(strace_popen): Never return NULL as error indicator,
abort with good error message instead.
(main): Remove NULL check of strace_popen result.
Denys Vlasenko [Wed, 22 Jun 2011 10:45:25 +0000 (12:45 +0200)]
Delete fork_tcb()
Get rid of fork_tcb() function. It used to do what the comment
above it says, but now it doesn't do much:
it only sets tcp->flags |= TCB_FOLLOWFORK and maybe calls
expand_tcbtab(). The second operation is not necessary, since
alloc_tcp() will do it itself when needed.
This patch deletes fork_tcb(), open-coding tcp->flags |= TCB_FOLLOWFORK
where it was formerly called. It also makes nprocs, tcbtabsize and
expand_tcbtab() static. (While at it, I nuked redundant
extern char **environ declaration: strace.c had *two* of them...)
* defs.h: Remove declarations of nprocs, tcbtabsize and
expand_tcbtab.
* process.c (fork_tcb): Remove this function.
(internal_fork): Open-code fork_tcb.
(handle_new_child): Likewise.
* strace.c: Remove redundant "extern char **environ". Declare
nprocs and tcbtabsize static.
(expand_tcbtab): Make it static.
Denys Vlasenko [Wed, 22 Jun 2011 10:41:57 +0000 (12:41 +0200)]
Simplify expand_tcbtab and alloc_tcb
Get rid of a few intermediate variables, simplifies a few expressions,
and uses error_msg_and_die instead of more verbose
fprintf+cleanup+exit sequence.
In alloc_tcp, I use memset to clear entire new tcp.
This not only saves a few bytes of code, but lowers the chances
of future bugs where some data "leaks out" into new tcb's
from old ones because we forgot to re-initialize it.
* strace.c (expand_tcbtab): Simplify this function. No logic changes.
(alloc_tcb): Likewise.
Denys Vlasenko [Tue, 21 Jun 2011 22:09:25 +0000 (00:09 +0200)]
Trivial fixes
* process.c (internal_fork): Remove conditionals which make no difference
(we return 0 on both branches of these ifs).
* util.c: Fix indentation of an ifdef.
Denys Vlasenko [Tue, 21 Jun 2011 12:34:10 +0000 (14:34 +0200)]
Fix regression introduced by "Properly handle real SIGTRAPs" change
Commit 3454e4b463e6c22c7ea8c5461ef5a077f4650a54
introduced a bug: sometimes, TRACECLONE/TRACE[V]FORK opts were not set.
The check (tcp->parent == NULL) in old code was meant to check
"if we are not a child created by auto-attach" - in this case,
options need to be set on the child; otherwise they are inherited
and do not need to be set.
I misunderstood the check and if tcp->parent is not NULL, I was
setting only ptrace_setoptions_for_all bits.
This change fixes the problem. Since the fixed logic makes it
unnecessary to keep two sets of options in separate variables,
I merge them back into one variable, ptrace_setoptions.
* defs.h: Merge ptrace_setoptions_followfork and ptrace_setoptions_for_all
into one variable, ptrace_setoptions.
* strace.c: Likewise.
(test_ptrace_setoptions_followfork): Use ptrace_setoptions variable.
(test_ptrace_setoptions_for_all): Likewise.
(main): Likewise.
* process.c (internal_fork): Likewise.
(internal_exec): Likewise.
* strace.c (trace): Fix the bug where different options were set
depending on "tcp->parent == NULL" condition. Add a comment
which makes it more clear why this condition is checked.
Denys Vlasenko [Sat, 18 Jun 2011 09:29:10 +0000 (11:29 +0200)]
Do not suspend waitpid.
strace used to suspend waitpid until there is a child
for waitpid'ing process to collect status from.
Apparently, it was done because in some very old kernels
(circa 2002 or even earlier) there were ptrace bugs which
were making waitpid in real parent to not see children.
This kernel bug is fixed long ago. This change removes the workaround.
test/wait_must_be_interruptible.c is a test program which
illustrates why without this change strace changes
programs's behavior.
* defs.h: Delete waitpid and nclone_waiting members from from struct tcb.
Remove declaration of internal_wait().
* process.c (internal_wait): Remove this function.
* strace.c (alloc_tcb): Do not set tcp->nclone_waiting.
(resume): Remove this function.
(resume_from_tcp): Remove this function.
(detach): Do not call resume_from_tcp().
(handle_group_exit): Do not call resume_from_tcp().
* syscall.c (internal_syscall): Do not call internal_wait().
Andi Kleen [Mon, 13 Jun 2011 22:05:44 +0000 (22:05 +0000)]
Enhance io_submit() decoding
strace didn't decode important fields in the iocb passed to io_submit.
This patch changes the code to dump them all. Also it prefixes the fields
with names to make it easier to read.
* desc.c (iocb_cmd_lookup, print_common_flags): New functions.
(sys_io_submit): New iocb decoder.
Denys Vlasenko [Wed, 8 Jun 2011 23:43:22 +0000 (01:43 +0200)]
Don't display bogus parameter for sigreturn syscall
* linux/*/syscallent.h: For those arches which use sys_sigreturn,
not printargs, to show [rt_]sigreturn syscall, change number of arguments
from 1 to 0: sys_sigreturn function doesn't use syscall parameters.
(I guess kernel doesn't actually _have_ any parameters for this syscall,
at least on these architectures). Do the same change for I386 and x86-64
even though they use printargs: I looked at kernel code and syscall
definitely doesn't have any parameters on these arches.
(I hesitate to change 1 to 0 params for arches I don't know -
it is remotely possible some of them do have a parameter for this syscall).
Denys Vlasenko [Wed, 8 Jun 2011 23:36:29 +0000 (01:36 +0200)]
Optimize sigreturn handling
* signal.c (sys_sigreturn): move stack pointer variables,
and for SPARC and MIPS, stack pointer and sigmask reading code
into "if (entering) ..." block, because it is only needed
in this branch; load tcp->u_arg[1] into sigmask for display
_after_ we know for sure u_arg[1] does contain valid sigmask
(IOW: perform operation only when we know we will need the result)
Denys Vlasenko [Wed, 8 Jun 2011 23:28:11 +0000 (01:28 +0200)]
"Modernize" four old-style function parameter declarations
* signal.c (signame, long_to_sigset, printsigmask, printsignal):
Convert old-style C function definitions to a "modern" form.
This does not change any actual code.
Denys Vlasenko [Wed, 8 Jun 2011 23:22:10 +0000 (01:22 +0200)]
Fix sigreturn decoding on MIPS
The "return 0" line was accidentally deleted circa 2007,
which made sigreturn on MIPS always display "= 0" return
instead of more informative " = ? (mask now [MASK])".
* strace.c (sys_sigreturn): Add wrongly deleted "return 0" line
Denys Vlasenko [Wed, 8 Jun 2011 14:15:04 +0000 (16:15 +0200)]
Print at least one space between SYSCALL(ARGS) and = RESULT if tracee is killed
We already do it in the normal case, but in rare code path where
tracee is gone (SIGKILLed?) sometimes we were printing this:
"SYSCALL(ARGS <unavailable>)= ? <unavailable>" - note jammed together ")=".
test/sigkill_rain.c can be used to verify the fix.
* strace.c (printleader): add a space after ")" in " <unavailable>)"
Denys Vlasenko [Wed, 8 Jun 2011 12:08:59 +0000 (14:08 +0200)]
Update test/* directory, it seem to be a bit bit-rotted
Added README; modified sigkill_rain.c to be more understandable,
made clone.c compile; added wait_must_be_interruptible.c test;
updated Makefile and .gitignore.
Dmitry V. Levin [Sat, 28 May 2011 20:47:43 +0000 (20:47 +0000)]
ARM EABI: fix 64-bit syscall's arguments decoding
ARM OABI and ARM EABI have different function parameters passing rules.
With EABI, 64-bit function parameters passed in registers are aligned to
an even-numbered register instead of using the next available pair, see
http://lkml.org/lkml/2006/1/12/175
This rule also applies to syscall's arguments.
* linux/arm/syscallent.h (pread, pwrite, truncate64, ftruncate64,
readahead, preadv, pwritev): Fix number of arguments.
* util.c (printllval): Align 64bit argument to 64bit boundary on
__ARM_EABI__.
Reported-by: Damir Shayhutdinov <damir@altlinux.org> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Denys Vlasenko [Fri, 27 May 2011 12:36:01 +0000 (14:36 +0200)]
Cleanups on top of "handle SIGTRAP properly" change,
based on Dmitry's comments.
* defs.h ([p]error_msg[_and_die]): Declare new functions.
* strace.c (SYSCALLTRAP): Rename to syscall_trap_sig.
([p]error_msg[_and_die]): Define new functions.
(strace_tracer_pid): New variable, it controls which pid will
do cleanup on exit via [p]error_msg_and_die.
(main): Set strace_tracer_pid to our initial pid.
(startup_attach): Change strace_tracer_pid if we are in -D mode.
(test_ptrace_setoptions_for_all): Minor changes to logic,
such as better diagnostic messages.
Denys Vlasenko [Tue, 24 May 2011 18:30:24 +0000 (20:30 +0200)]
Don't perform TCB_WAITEXECVE wait if not needed.
* defs.h (ptrace_setoptions_for_all): Expose this variable.
* strace.c (ptrace_setoptions_for_all): Remove "static".
* process.c (internal_exec): Don't set TCB_WAITEXECVE bit
if we know that post-execve SIGTRAP is not going to happen.
Denys Vlasenko [Mon, 23 May 2011 19:29:03 +0000 (21:29 +0200)]
Properly handle real SIGTRAPs.
* defs.h (ptrace_setoptions): Variable renamed to ptrace_setoptions_followfork.
* process.c (internal_fork): Ditto.
* strace.c (ptrace_setoptions_for_all): New variable.
(SYSCALLTRAP): New variable.
(error_msg_and_die): New function.
(test_ptrace_setoptions_for_all): New function.
(main): Call test_ptrace_setoptions_for_all() at init.
(handle_ptrace_event): Handle PTRACE_EVENT_EXEC (by ignoring it).
(trace): Check events and set ptrace options without -f too.
Check WSTOPSIG(status) not for SIGTRAP, but for SYSCALLTRAP.
Grant Edwards [Thu, 7 Apr 2011 20:25:40 +0000 (20:25 +0000)]
Add ability to print file descriptor paths and filter by those paths
* pathtrace.c: New file, implements matching syscall arguments to
user-specified file paths.
* Makefile.am (strace_SOURCES): Add pathtrace.c.
* defs.h (TCB_FILTERED, filtered): New defines.
(getfdpath, pathtrace_select, pathtrace_match, show_fd_path,
tracing_paths): New declarations.
* strace.c (show_fd_path, tracing_paths): New global variables.
(usage, main): Implement handling of -y and -P options.
* strace.1: Add descriptions of -y and -P options.
* syscall.c (trace_syscall_entering): Add path matching logic to the
print/noprint decision and set the TCB_FILTERED bit appropriately.
(trace_syscall_exiting): Use filtered() macro that checks the
TCB_FILTERED bit to determine print/noprint status.
* util.c (printfd): Use getfdpath().
Mike Frysinger [Mon, 21 Feb 2011 04:24:22 +0000 (23:24 -0500)]
linux/ioctlent: unify them all
This unifies all the ioctlent.h's in the linux subdir while still
allowing each arch to maintain its own minor list.
The basic method is:
- each arch has linux/<arch>/ioctlent.h.in which defines only the
arch-specific ioctls;
- linux/ioctlent.h.in which defines only the common ioctls;
- at build time, these two headers are combined and sorted to produce
the linux/ioctlent.h file.
This also requires a little tweaking of the include files since the
common ioctlent.h is a built file.
* linux/ioctlent.h: Split into linux/ioctlent.h.in and
linux/i386/ioctlent.h.in, remove asm entries from the former, remove
non-asm entries from the latter.
* linux/alpha/ioctlent.h: Rename to linux/alpha/ioctlent.h.in, remove
non-asm entries.
* linux/bfin/ioctlent.h: Rename to linux/bfin/ioctlent.h.in, remove
non-asm entries.
* linux/hppa/ioctlent.h: Rename to linux/hppa/ioctlent.h.in, remove
non-asm entries.
* linux/ia64/ioctlent.h: Rename to linux/ia64/ioctlent.h.in, remove
non-asm entries.
* linux/mips/ioctlent.h: Rename to linux/mips/ioctlent.h.in, remove
non-asm entries.
* linux/powerpc/ioctlent.h: Rename to linux/powerpc/ioctlent.h.in,
remove non-asm entries.
* linux/s390/ioctlent.h: Rename to linux/s390/ioctlent.h.in, remove
non-asm entries.
* linux/sh/ioctlent.h: Rename to linux/sh/ioctlent.h.in, remove
non-asm entries.
* linux/sparc/ioctlent.h: Rename to linux/sparc/ioctlent.h.in, remove
non-asm entries.
* linux/arm/ioctlent.h.in: New file.
* linux/avr32/ioctlent.h.in: Likewise.
* linux/i386/ioctlent.h.in: Likewise.
* linux/m68k/ioctlent.h.in: Likewise.
* linux/microblaze/ioctlent.h.in: Likewise.
* linux/tile/ioctlent.h.in: Likewise.
* linux/x86_64/ioctlent.h.in: Likewise.
* linux/s390x/ioctlent.h.in: Include ioctlent.h.in instead of
ioctlent.h.
* linux/sh64/ioctlent.h.in: Likewise.
* linux/sparc64/ioctlent.h.in: Likewise.
* linux/arm/ioctlent1.h: Update ioctlent.h include.
* linux/powerpc/ioctlent1.h: Likewise.
* linux/sparc/ioctlent1.h: Likewise.
* linux/sparc64/ioctlent1.h: Likewise.
* linux/x86_64/ioctlent1.h: Likewise.
* Makefile.am (AM_CPPFLAGS): Add -I$(builddir)/$(OS).
(EXTRA_DIST): Update.
[MAINTAINER_MODE && LINUX]: Convert from ioctlent_h to ioctlent_h_in.
[LINUX]: Add $(builddir)/$(OS)/ioctlent.h generation rules.
* .gitignore: Add linux/ioctlent.h.
Dmitry V. Levin [Thu, 10 Mar 2011 21:20:35 +0000 (21:20 +0000)]
Show more details about signals received by traced processess
* strace.c [!USE_PROCFS] (trace): Differentiate output format depending
on PTRACE_GETSIGINFO success or failure. In the former case, use
printsiginfo() to show more details about received signal.
Dmitry V. Levin [Thu, 10 Mar 2011 14:44:45 +0000 (14:44 +0000)]
Get rid of PT_GETSIGINFO
* strace.c [!USE_PROCFS] (trace): Assume that PTRACE_GETSIGINFO is
available. Replace PT_GETSIGINFO with PTRACE_GETSIGINFO. Use
PTRACE_GETSIGINFO for all signals.
Dmitry V. Levin [Thu, 3 Mar 2011 01:02:41 +0000 (01:02 +0000)]
Fix struct xlat initialization bugs
* file.c (inotify_modes): Terminate with NULL entry.
* net.c (sock_type_flags): Make this array static.
(socketlayers): Add a comment that this array should remain not
NULL-terminated.
Dmitry V. Levin [Thu, 3 Mar 2011 00:10:20 +0000 (00:10 +0000)]
tests: avoid SIGPIPE
* tests/ptrace_setoptions: Replace "grep -q" with "grep > /dev/null".
The former may result to strace being killed by SIGPIPE, which in
certain configuratons may lead to generation of a core file.
Suggested by Mike Frysinger.
Dmitry V. Levin [Sat, 26 Feb 2011 14:32:12 +0000 (14:32 +0000)]
Remove redundant ioctlent.h files
* linux/s390x/ioctlent.h: Replace old contents with include of
s390/ioctlent.h file.
* linux/sparc64/ioctlent.h: Replace old contents with include of
sparc/ioctlent.h file.
Dmitry V. Levin [Thu, 24 Feb 2011 01:51:15 +0000 (01:51 +0000)]
Generate much of the CREDITS file from git log
* CREDITS.in: New file, derived from CREDITS, without names of
those who are listed as git log 'Author:'s.
* CREDITS: Remove file.
* Makefile.am [MAINTAINER_MODE] (CREDITS): New rule.
* .gitignore: Add CREDITS.
* .mailmap: New file, required to map git author names and email
addresses to canonical/preferred form.
Dmitry V. Levin [Tue, 18 Jan 2011 17:36:20 +0000 (17:36 +0000)]
Fix decoding of get[ug]id, gete[ug]id and setfs[ug]id return values
* defs.h (SYSCALL_NEVER_FAILS): New syscall flag.
* linux/dummy.h: Change redirection for sys_get[ug]id, sys_gete[ug]id
and setfs[ug]id.
* linux/*/syscallent.h: Set SYSCALL_NEVER_FAILS flag for get[ug]id,
gete[ug]id and setfs[ug]id syscalls.
* process.c [LINUX] (sys_getuid, sys_setfsuid): New functions.
* syscall.c (NF): New shorthand macro for use in syscallent.h files.
(get_error): Check SYSCALL_NEVER_FAILS flag.
Reported by Марк Коренберг <socketpair@gmail.com>.
Dmitry V. Levin [Sun, 16 Jan 2011 23:07:51 +0000 (23:07 +0000)]
block.c: cleanup
* block.c: Include <inttypes.h>.
(print_blkpg_req): Always decode struct blkpg_ioctl_arg.
Robustify decoding of strings.
(block_ioctl): Do not decode return values passed by pointers on exit
from failed syscalls.
Use format macros from inttypes.h to print values of type uint64_t.
Dmitry V. Levin [Sat, 15 Jan 2011 20:15:31 +0000 (20:15 +0000)]
Add block ioctl support
* block.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h [LINUX] (block_ioctl): New function.
* ioctl.c (ioctl_decode) [LINUX]: Use it to decode HDIO_* and BLK*
ioctls.
Patch by Jeff Mahoney <jeffm@suse.com>