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* defs.h (Tflag_scale, Tflag_width): New declarations.
* strace.c (Tflag_scale, Tflag_width, rflag_scale, rflag_width): New
variables.
(printleader): Parametrise relative timestamp printing with rflag_width
and rflag_scale.
(init) <longopts>: Change second field of "relative-timestamps" and
"syscall-times" from no_argument to optional_argument.
(init) <case 'r', case 'T'>: Handle optarg, fail if the scale variable
is set to -1.
(usage): Document it.
* strace.1.in (.SS Output format): Likewise.
* syscall.c (syscall_exiting_trace): Parametrise syscall time printing
* with Tflag_width and Tflag_scale.
* tests/gen_tests.in (strace--relative-timestamps-s,
strace--relative-timestamps-ms, strace--relative-timestamps-us,
strace--relative-timestamps-ns): New tests.
* tests/options-syntax.test: New checks for --relative-timestamps and
--syscall-times option syntax.
* tests/strace--relative-timestamps-ms.expected: New file.
* tests/strace--relative-timestamps-ns.expected: Likewise.
* tests/strace--relative-timestamps-s.expected: Likewise.
* tests/strace--relative-timestamps-us.expected: Likewise.
* tests/strace--syscall-times-ms.expected: Likewise.
* tests/strace--syscall-times-ns.expected: Likewise.
* tests/strace--syscall-times-s.expected: Likewise.
* tests/strace--syscall-times-us.expected: Likewise.
* tests/Makefile.am (EXTRA_DIST): Add them.
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