perf trace: Add a etcsnoop.c augmented syscalls eBPF utility

perf trace: Add a etcsnoop.c augmented syscalls eBPF utility

We need to put common stuff into a separate header in tools/perf/include/bpf/
for these augmented syscalls, but I couldn't resist adding a etcsnoop.c tool,
combining augmented syscalls + filtering, that in the future will be passed
from 'perf trace''s command line, to use in building the eBPF program to do
that specific filtering at the source, inside the kernel:

  Running system wide: (hope there isn't any embarassing stuff here...  ;-) )

  # perf trace -e tools/perf/examples/bpf/etcsnoop.c
       0.000 sed/21878 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
    1741.473 cat/21883 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
    1741.892 cat/21883 openat(dfd: CWD, filename: /etc/passwd)
    1748.948 sed/21886 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
    1777.136 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1777.738 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.158 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.528 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.595 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.901 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.939 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.966 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1778.992 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.019 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.045 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.071 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.095 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.121 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.148 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.175 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.202 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.229 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.254 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.279 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.309 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.336 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.363 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.388 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.414 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.442 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.470 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.500 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.529 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.557 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.586 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.617 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.648 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.679 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.706 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.739 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.769 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.798 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.823 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.844 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.862 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.880 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.911 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.942 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1779.972 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1780.004 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
    1780.035 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
   13059.154 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13060.739 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13061.990 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13063.177 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13064.265 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13065.483 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13067.383 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13068.902 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13069.922 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13070.915 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13072.612 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13074.816 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13077.343 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13078.731 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC)
   13559.064 DNS Res~er #22/21054 open(filename: /etc/hosts, flags: CLOEXEC)
   22419.522 sed/21896 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   24473.313 git/21900 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   24491.988 less/21901 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   24493.793 git/21901 openat(dfd: CWD, filename: /etc/sysless)
   24565.772 sed/21924 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   25878.752 git/21928 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   26075.666 git/21928 open(filename: /etc/localtime, flags: CLOEXEC)
   26075.565 less/21929 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   26076.060 less/21929 openat(dfd: CWD, filename: /etc/sysless)
   26346.395 sed/21932 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   26483.583 sed/21938 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   26954.890 sed/21944 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   27016.165 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime)
   27016.414 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime)
   27712.313 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime)
   27712.616 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime)
   27829.035 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   27829.368 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   27829.584 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   27829.800 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   27830.107 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   27830.521 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   27961.516 git/21948 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   27987.568 less/21949 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   27988.948 bash/21949 openat(dfd: CWD, filename: /etc/sysless)
   28043.536 sed/21972 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   28736.008 sed/21978 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   34882.664 git/21991 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   34882.664 sort/21990 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   34884.441 uniq/21992 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   35593.098 git/21997 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   35638.839 git/21997 openat(dfd: CWD, filename: /etc/gitattributes)
   35702.851 sed/22000 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   36076.039 sed/22006 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   37569.049 git/22014 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   37673.712 git/22014 open(filename: /etc/localtime, flags: CLOEXEC)
   37781.710 vim/22040 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   37783.667 git/22040 openat(dfd: CWD, filename: /etc/vimrc)
   37792.394 git/22040 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   37792.436 git/22040 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   37792.580 git/22040 open(filename: /etc/passwd, flags: CLOEXEC)
   43893.625 DNS Res~er #23/21365 open(filename: /etc/hosts, flags: CLOEXEC)
   48060.409 nm-dhcp-helper/22044 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48071.745 systemd/1 openat(dfd: CWD, filename: /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service, flags: CLOEXEC|NOFOLLOW|NOCTTY)
   48082.780 nm-dispatcher/22049 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48111.418 systemd/22049 open(filename: /etc/NetworkManager/dispatcher.d, flags: CLOEXEC|DIRECTORY|NONBLOCK)
   48111.904 systemd/22049 open(filename: /etc/localtime, flags: CLOEXEC)
   48118.357 00-netreport/22052 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48119.668 systemd/22052 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   48119.762 systemd/22052 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48119.887 systemd/22052 open(filename: /etc/passwd, flags: CLOEXEC)
   48120.025 systemd/22052 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/00-netreport)
   48124.144 hostname/22054 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48125.492 systemd/22052 openat(dfd: CWD, filename: /etc/init.d/functions)
   48127.253 systemd/22052 openat(dfd: CWD, filename: /etc/profile.d/lang.sh)
   48127.388 systemd/22052 openat(dfd: CWD, filename: /etc/locale.conf)
   48137.749 cat/22056 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48143.519 04-iscsi/22058 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48144.438 04-iscsi/22058 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   48144.478 04-iscsi/22058 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48144.577 04-iscsi/22058 open(filename: /etc/passwd, flags: CLOEXEC)
   48144.819 04-iscsi/22058 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/04-iscsi)
   48145.620 10-ifcfg-rh-ro/22059 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48146.169 systemd/22059 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   48146.207 systemd/22059 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48146.287 systemd/22059 open(filename: /etc/passwd, flags: CLOEXEC)
   48146.387 systemd/22059 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/10-ifcfg-rh-routes.sh)
   48147.215 11-dhclient/22060 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48147.787 11-dhclient/22060 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   48147.813 11-dhclient/22060 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48147.929 11-dhclient/22060 open(filename: /etc/passwd, flags: CLOEXEC)
   48148.016 11-dhclient/22060 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/11-dhclient)
   48148.906 grep/22063 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48151.165 11-dhclient/22060 openat(dfd: CWD, filename: /etc/sysconfig/network)
   48151.560 11-dhclient/22060 open(filename: /etc/dhcp/dhclient.d/, flags: CLOEXEC|DIRECTORY|NONBLOCK)
   48151.704 11-dhclient/22060 openat(dfd: CWD, filename: /etc/dhcp/dhclient.d/chrony.sh)
   48153.593 20-chrony/22065 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48154.695 20-chrony/22065 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   48154.756 20-chrony/22065 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48154.914 20-chrony/22065 open(filename: /etc/passwd, flags: CLOEXEC)
   48155.067 20-chrony/22065 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/20-chrony)
   48156.962 25-polipo/22066 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48157.824 systemd/22066 open(filename: /etc/nsswitch.conf, flags: CLOEXEC)
   48157.866 systemd/22066 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC)
   48157.981 systemd/22066 open(filename: /etc/passwd, flags: CLOEXEC)
   48158.090 systemd/22066 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/25-polipo)
   48533.616 gsd-housekeepi/2412 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC)
   87122.021 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime)
   87122.146 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime)
   87825.582 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime)
   87825.844 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime)
   87829.524 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   87830.531 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   87831.288 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   87832.011 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   87832.672 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   87833.276 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime)
   ^C#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-0o770jvdcy04ee6vhv6v471m@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>