tests: (lsfd::mkfds-multiplexing) skip if /proc/$pid/syscall is broken

Close #2867
Close #2887

We should skip the test case on the platforms where /proc/$pid/syscall
doesn't report correct system call number. On such platforms,

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
(cherry picked from commit e199a933058ae052b1dfa2fcb457791f47b60b11)

diff --git a/tests/ts/lsfd/mkfds-multiplexing b/tests/ts/lsfd/mkfds-multiplexing
index 8cc7f31c09807959adbb0b24bd66f82b142ef52c..a53f6eb122d3b461067a04f40cd0d1b93d497dc9 100755 (executable)
--- a/tests/ts/lsfd/mkfds-multiplexing
+++ b/tests/ts/lsfd/mkfds-multiplexing
@@ -26,6 +26,8 @@ ts_check_test_command "$TS_HELPER_MKFDS"
 # /proc/${PID}/syscall is rendered in the host side byteorder.
 ts_skip_qemu_user
 
+ts_check_prog "cat"
+ts_check_prog "cut"
 ts_check_prog "grep"
 
 ts_cd "$TS_OUTDIR"
@@ -44,12 +46,24 @@ for multiplexer in pselect6 select poll ppoll; do
     } > "$TS_OUTPUT" 2>&1
 
     if read -r -u "${MKFDS[0]}" PID; then
-       if ! cat /proc/"${PID}"/syscall > /dev/null 2>&1; then
+       syscall_line=$(cat /proc/"${PID}"/syscall 2>> "$TS_OUTPUT")
+       syscall_status=$?
+       if [[ "$syscall_status" != 0 ]]; then
            kill -CONT "${PID}"
            wait "${MKFDS_PID}"
            ts_skip_subtest "cannot open /proc/${PID}/syscall"
            continue
        fi
+       syscall_n=$(cut -f1 -d' ' <<< "$syscall_line")
+       # We assume the syscall number for the $multiplexer is not zero
+       # on any platforms.
+       if [[ "$syscall_n" == 0 ]]; then
+           kill -CONT "${PID}"
+           wait "${MKFDS_PID}"
+           ts_skip_subtest "incorrect syscall number in /proc/${PID}/syscall"
+           continue
+       fi
+
        {
            "${TS_CMD_LSFD}" -n -o ASSOC,XMODE -p "${PID}" -Q '(FD >= 10) && (FD <= 22)'
            echo "[$multiplexer] ASSOC,XMODE: $?"