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The following are examples of sh_flow.d.
This is a simple script to trace the flow of Bourne shell functions,
builtins and external commands. Here it traces the example program,
Code/Shell/func_abc.sh.
# sh_flow.d
C TIME(us) FILE -- NAME
0 3060274370505 func_abc.sh -> func_a
0 3060274370529 func_abc.sh > echo
0 3060274372742 func_abc.sh | sleep
0 3060275381634 func_abc.sh -> func_b
0 3060275381660 func_abc.sh > echo
0 3060275383852 func_abc.sh | sleep
0 3060276391653 func_abc.sh -> func_c
0 3060276391679 func_abc.sh > echo
0 3060276393671 func_abc.sh | sleep
0 3060277401753 func_abc.sh <- func_c
0 3060277401767 func_abc.sh <- func_b
0 3060277401775 func_abc.sh <- func_a
^C
As each function is entered, the third column is indented by 2 spaces. This
shows which function is calling who - the output abovebegins by showing that
func_a() began, and then called func_b().
If the output looks shuffled, check the CPU "C" and "TIME" columns, and
post sort based on TIME if necessary.
See Notes/ALLflow_notes.txt for important notes about reading flow outputs.
The following traces the firefox startup script.
# sh_flow.d
C TIME(us) FILE -- NAME
0 3060321598138 firefox > test
0 3060321603730 firefox > [
0 3060321603796 firefox > cd
0 3060321603878 firefox > [
0 3060321603900 firefox > [
0 3060321604099 firefox > [
0 3060321609050 firefox > echo
0 3060321620601 firefox > echo
0 3060321626369 firefox > [
0 3060321626432 firefox > export
0 3060321626459 firefox -> moz_pis_startstop_scripts
0 3060321626519 firefox > export
0 3060321626966 firefox > [
0 3060321627031 firefox > .
0 3060321628446 firefox -> moz_spc_verbose_echo
0 3060321628458 firefox > :
0 3060321628467 firefox <- moz_spc_verbose_echo
0 3060321636461 firefox > [
0 3060321636738 firefox -> moz_spc_verbose_echo
0 3060321636751 firefox > :
0 3060321636760 firefox <- moz_spc_verbose_echo
0 3060321636778 firefox > [
0 3060321636793 firefox > [
0 3060321636817 firefox > [
0 3060321637126 firefox -> moz_spc_verbose_echo
0 3060321637136 firefox > :
0 3060321637143 firefox <- moz_spc_verbose_echo
0 3060321666922 firefox -> moz_spc_verbose_echo
0 3060321666952 firefox > :
0 3060321666964 firefox <- moz_spc_verbose_echo
0 3060321674929 firefox > [
0 3060321680246 firefox > [
0 3060321680312 firefox -> moz_spc_verbose_echo
0 3060321680323 firefox > :
0 3060321680331 firefox <- moz_spc_verbose_echo
0 3060321680356 firefox -> moz_spc_verbose_echo
0 3060321680363 firefox > :
0 3060321680370 firefox <- moz_spc_verbose_echo
0 3060321680396 firefox > [
0 3060321680428 firefox <- moz_pis_startstop_scripts
0 3060321680525 firefox > [
0 3060321680580 firefox > [
0 3060321685358 firefox | /usr/lib/firefox/run-mozilla.sh
0 3060321700731 run-mozilla.sh > [
0 3060321700950 run-mozilla.sh > break
0 3060321703259 run-mozilla.sh > [
0 3060321703292 run-mozilla.sh > shift
0 3060321703382 run-mozilla.sh > [
0 3060321703421 run-mozilla.sh > [
0 3060321703493 run-mozilla.sh > [
0 3060321703642 run-mozilla.sh > [
0 3060321703669 run-mozilla.sh > export
0 3060321703706 run-mozilla.sh > [
0 3060321703725 run-mozilla.sh > [
0 3060321703857 run-mozilla.sh > [
0 3060321703880 run-mozilla.sh > export
0 3060321703925 run-mozilla.sh > export
0 3060321703954 run-mozilla.sh > [
0 3060321703982 run-mozilla.sh -> moz_run_program
0 3060321704013 run-mozilla.sh > [
0 3060321704049 run-mozilla.sh -> moz_test_binary
0 3060321704065 run-mozilla.sh > [
0 3060321704097 run-mozilla.sh > [
0 3060321704127 run-mozilla.sh > return
0 3060321704137 run-mozilla.sh <- moz_test_binary
0 3060321704151 run-mozilla.sh > [
0 3060321709953 run-mozilla.sh > type
0 3060321724260 run-mozilla.sh > [
0 3060321724559 run-mozilla.sh > [
0 3060321724574 run-mozilla.sh > [
0 3060321727396 run-mozilla.sh | /usr/lib/firefox/firefox-bin
0 3060325513871 run-mozilla.sh > [
0 3060325513898 run-mozilla.sh > [
0 3060325513929 run-mozilla.sh > [
0 3060325513940 run-mozilla.sh <- moz_run_program
0 3060325513967 run-mozilla.sh > exit
0 3060325515113 firefox -> moz_pis_startstop_scripts
0 3060325515189 firefox > export
0 3060325515431 firefox > [
0 3060325515466 firefox > [
0 3060325515487 firefox <- moz_pis_startstop_scripts
0 3060325515503 firefox > exit
This shows the flow, incluing the handover between the "firefox" script
and the "run-mozilla.sh" script.
There is a point in the output where flow appears to reverse (at time
3060321709953, with the entry "> type"). This is due to another instance
of the run-mozilla.sh script running, which is indistinguishable from
the other lines in the output. To confirm this for yourself, add a PID
column to the flow script (or use sh_flowinfo.d).
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