Constify tv_* functions

* defs.h (tv_nz, tv_cmp, tv_float, tv_add, tv_sub, tv_mul, tv_div): Add
const qualifier to read only arguments.
* util.c (tv_nz, tv_cmp, tv_float, tv_add, tv_sub, tv_mul, tv_div):
Likewise.
Constify count_syscall function

* count.c (count_syscall): Add const qualifier to timeval argument and
rename it.  Store the wall clock time spent while in syscall in separate
timeval variable.
* defs.h (count_syscall): Update prototype.
* syscall.c (trace_syscall_exiting): Update count_syscall invocation.
Optionally produce stats on syscall latency

Time spent in system time is not useful where a syscall depends on some
non-CPU resource, eg. typically open() or stat() to a network drive.

This patch adds a new flag (-w) to produce a summary of the time
difference between beginning and end of the system call (ie. latency)

This functionality has been useful to profile slow processes that
are not CPU-bound.

Signed-off-by: Mark Hills <mark.hills@framestore.com>
tests: add a test for -c and -w options

* tests/count.test: New test.
* tests/Makefile.am (TESTS): Add it.
Decode file descriptors passed via SCM_RIGHTS control messages

* net.c (printcmsghdr): Print descriptors from SCM_RIGHTS control
messages using printfd.
* tests/scm_rights.c: New file.
* tests/scm_rights-fd.test: New test.
* tests/Makefile.am (check_PROGRAMS): Add scm_rights.
(TESTS): Add scm_rights-fd.test.
* tests/.gitignore: Add scm_rights and uio.
tests: fix SCM_RIGHTS test for big-endian systems

* tests/scm_rights.c (main): Send zero integer to avoid issues with
endianness.
* tests/scm_rights-fd.test: Update grep patterns.
Implement xlat generator

* bootstrap: New file.
* xlat/gen.sh: Likewise.
* Makefile.am: Include xlat/Makemodule.am
(EXTRA_DIST): Add $(XLAT_INPUT_FILES), $(XLAT_HEADER_FILES), and
xlat/gen.sh.
Use bootstrap script consistently

Now that ./xlat/gen.sh has to be run before autoreconf,
replace all autoreconf calls with ./bootstrap call.

* bootstrap: Forward arguments to autoreconf.
* build_static_example.sh: Replace autoreconf call with bootstrap call.
* make-dist: Likewise.
* qemu_multiarch_testing/README: Likewise.
Enhance xlat generator

* xlat/gen.sh: Define all xlat structs not declared in defs.h as static.
Some symbolic constants are not macros, extend #ifdef check to cover
symbolic constants checked by AC_CHECK_DECLS.
Handle complex symbolic constants in SYMBOL|... form.
Handle symbolic constants in 1<<SYMBOL form.
Handle numeric constants.
Implement #unconditional directive that turns off preprocessor checks.
Implement #unterminated directive that turns off adding XLAT_END.
Rename several xlat structures to avoid collisions

* bjm.c (which): Rename to qm_which.
* ipc.c (msg_flags): Rename to ipc_msg_flags.
* time.c (which): Rename to itimer_which.
Generate xlat/*.in files

Automatically convert xlat structures from *.c files to xlat/*.in files
using "./generate_xlat_in.sh *.c" command.
xlat: cleanup the aftermath of automatic conversion
Compress blank lines

Suppress empty lines left after automated xlat conversion.
Check for LO_FLAGS_READ_ONLY constant

* configure.ac (AC_CHECK_DECLS): Add LO_FLAGS_READ_ONLY.
Check for constants used by waitid function

* configure.ac (AC_CHECK_DECLS): Add P_* constants.
sysctl: update CTL_*, KERN_*, NET_*, and VM_* constants

* configure.ac (AC_CHECK_DECLS): Add CTL_*, KERN_*, NET_*, and
VM_* constants.
* system.c (CTL_PROC, CTL_CPU): Remove definitions.
* xlat/sysctl_*.in: Update.
Add -k option to print stack trace after each syscall

Print the stack trace of the traced process after each system call when
-k option is specified.  It is implemented using libunwind to unwind the
stack and to obtain the function name pointed by the IP.

Based on the code that was originally taken from strace-plus
of Philip J. Guo.

* configure.ac: Add --with-libunwind option.  Check libunwind support.
* Makefile.am: Add libunwind support.
* defs.h (struct tcb) [USE_LIBUNWIND]: Append libunwind specific fields.
[USE_LIBUNWIND] (stack_trace_enabled, alloc_mmap_cache,
delete_mmap_cache, print_stacktrace): New prototypes.
* mem.c (print_mmap, sys_munmap, sys_mprotect): Add libunwind support.
* process.c (sys_execve): Likewise.
* strace.c (usage, alloctcb, droptcb, init): Likewise.
* syscall.c (trace_syscall_exiting): Likewise.
* unwind.c: New file.
* strace.1: Document -k option.
unwind: fix a bug in range updating of binary search

* unwind.c (print_stacktrace): Fix off-by-one error in binary search.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Luca Clementi <luca.clementi@gmail.com>
unwind: make alloc_mmap_cache function local

* defs.h (alloc_mmap_cache): Remove.
* unwind.c (alloc_mmap_cache): Add static qualifier.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
unwind: delete mmap cache in free_libunwind_ui

free_libunwind_ui is expected to release all unwind related resources
attached to tcp.

* strace.c (droptcb): Move delete_mmap_cache call ...
* unwind.c (free_libunwind_ui): ... to here.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>