Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r239501:
- Use pid_t type instead of just int.

MFC r239611:
- Put arguments for print_syscall_ret() function in proper order.
Bug was introduced in r192025.

MFC r239898:
- Remove unused variables.
- Fix warnings about comparing signed and unsigned ints.

MFC r240005:
- Style(9) cleanup.

MFC r240364:
- Remove unused variables.
- Remove redundant return after err(3) call.

MFC r240393:
- Fix detaching under some circumstances.

When truss is detaching from very active process it is possible to
hang on waitpid(2) in restore_proc() forever, because
ptrace(PT_SYSCALL) must be called before detaching, to allow the
debugging process to continue execution. Also when truss called with
'-c' argument, it does not print anything after detach, because it
immediately exits from restore_proc().

To fix these two problems make detaching deferred, but then it is
impossible to detach from a process which does not do any system call.
To fix this issue use sigaction(2) instead of signal(3) to disable
SA_RESTART flag for waitpid(2) that makes it non-restartable. Remove
global variable child_pid, because now detaching is handled in context
where child's pid is known.

MFC r240562:
- Make truss thread-aware.

Approved by: kib (mentor)

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix copyright spelling.

PR: 139825
Submitted by: Ruslan Mahmatkhanov

Correct off-by-one issue in truss(1) which happens when system call number
is nsyscalls.

PR: bin/134916
Submitted by: Steven Hartland <steven hartland multiplay co uk>
MFC after: 2 weeks

Reduce diff against my local version: replace malloc+memset() cases to calloc().

Add -c option to summarize number of calls, errors, and system time.

Reviewed by: alfred

MFp4: Bugfixes for truss(1):

- Fix logic handling execve(). We will not be able to
obtain information otherwise.
- truss coredump [1].
- truss does not work against itself [2].

PR: bin/58970 [1], bin/45193 [2]
Submitted by: Howard Su
Approved by: re (kensmith)

Make use of ptrace(2) instead of procfs in truss(1), eliminating
yet another need of an available /proc/ mount.

Tested with: make universe
Submitted by: howardsu
Reviewed by: alfred

- Fix crash when hitting unknown syscall. Copied from i386-fbsd.c

Approved by: alfred

Add a -s flag for the same functionality as strace. Introduce a Name
type which is a String type that has no -s limitations applied to it.
Change most Strings in the code to Names and add a few extra syscalls,
namely munmap, read, rename and symlink. This was enough to facilitate
following file descriptor allocations in the code more easily and
getting a hint at what's being read/written from/to files. More
syscalls should really be added.

While here, fix an off-by-one bug in the buffer truncation code and
add a fflush so that truss's output reflects the syscall that the
program is stuck in.

Sponsored by: Sophos/Activestate
MFC after: 2 weeks

Support readlink(2) better. Readlink does not nul terminate the
result buffer, so we need to format it ourselves. The problem is
that the length is stored as the return value from readlink, so we
need to pass the return value from our syscall into print_arg.

Motivated by: truss garbage on my screen from reading /etc/malloc.conf.

Move declarations of Procfd to a header file.

Port truss(1) to 64-bit architectures:
o Syscall return values do not fit in int on 64-bit architectures.
Change the type of retval in <arch>_syscall_exit() to long and
change the prototype of said function to return a long as well.
o Change the prototype of print_syscall_ret() to take a long for
the return address and change the format string accordingly.
o Replace the code sequence
tmp = malloc(X);
sprintf(tmp, format, ...);
with X by definition too small on 64-bit platforms by
asprintf(&tmp, format, ...);

With these changes the output makes sense again, although it does
mess up the tabulation on ia64. Go widescreen...

Not tested on: alpha, sparc64.

Various cleanups of truss:
1) Missing include.
2) Constness.
3) ANSIfication.
4) Avoid some shadowing.
5) Add/clarify some error messages.
6) Some int functions were using return without a value.
7) Mark some parameters as unused.
8) Cast a value we know is non-negative to a size_t before comparing.

- Use time.h not sys/time.h.
- Fix printf format errors.

Submitted by: bde

Diff reduction.

Include <sys/time.h> for the declaration of struct timeval. Do not
depend on namespace pollution in <signal.h>. (truss shouldn't be
using timevals anyway, since it was implemented long after timevals
were obsoleted by timespecs.)

Add options to print the argument and environment string parameters to
execve().

This could be done in a more general manner but it still wouldn't
be very pretty.

MFC after: 3 weeks

Terminate the output line when a non-returning syscall is printed.

Allow tracking fork()ed children.

PR: bin/25587 (in part)
MFC after: 3 weeks

Parameterize globals.

PR: bin/25587 (in part)
MFC after: 3 weeks

s/inline/__inline/

Partial WARNS=1 fizes with NO_WERROR set to prevent world breakage.
Use __FBSDID().

Print the correct return code for successful Linux syscalls.

Submitted by: Vitezslav Novy <vita@fio.cz>
PR: 32036
MFC after: 1 week

#include <sys/proc.h> where needed (for the stop event definitions) and
reorder includes everywhere to conform to style(9).

Change the output of truss to more closely resemble SysV's. (Yes, it
really is much nicer looking.)

Submitted by: "Matthew N. Dodd" <winter@jurai.net>

$Id$ -> $FreeBSD$

Fixed printf format errors.

Revert the changes yet again, after some email from Bruce. Sorry.

Proper way to do the previous mis-commit. Still not quite right, because
some header files (e.g., <err.h>) include <machine/something.h>, and this
will not pick up the right header files, so it may be removed eventually
anyway. But some people who are not willing to build the right way
apparantly want this, so this is for them.

Sort Xrefs. Use err(3). Remove uneeded #include.
Correct usage: one of {-p pid, command} is required.
Open output file when command line is fully analyzed: incorrect `truss -o f'
command does not create an empty file anymore.

Add some copyright and license terms, at Jordan's request. Note that
syscall.h just refers to another file for the copyright notice.

Truss program. Requires procfs.