instrumentation/syscalls/lttng-get-syscall-inout.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   3
   4 # example usage:
   5 # lttng-get-syscall-inout.sh table-syscall-inout.txt select 1
   6
   7 FILENAME=$1
   8 SYSCALL_NAME=$2
   9 ARG_NR=$3
  10 TMPFILE=$(mktemp)
  11
  12 # Delete temp file on exit
  13 trap 'rm -f "$TMPFILE"' EXIT
  14
  15
  16 if [ x"${FILENAME}" = x"" ]; then
  17         echo "Error: Please specify input file name as first argument" >&2
  18         exit 1
  19 fi
  20
  21 if [ x"${SYSCALL_NAME}" = x"" ]; then
  22         echo "Error: Please specify system call name as second argument" >&2
  23         exit 1
  24 fi
  25
  26 if [[ x"${ARG_NR}" = x"" || ${ARG_NR} == 0 ]]; then
  27         echo "Error: Please specify argument number larger than 0 as third argument" >&2
  28         exit 1
  29 fi
  30
  31 # Abort on error and undefined variable
  32 set -eu
  33
  34 # Get the required syscall
  35 grep "syscall ${SYSCALL_NAME} " "${FILENAME}" > "${TMPFILE}" || true
  36
  37 # Error out if we got more than one syscall
  38 NR_MATCH=$(wc -l < "${TMPFILE}")
  39 if [ "${NR_MATCH}" -gt 1 ]; then
  40         echo "Error: more than one system call match" >&2
  41         exit 1
  42 fi
  43
  44 # Default to sc_inout for unknown syscalls
  45 if [ "${NR_MATCH}" -eq 0 ]; then
  46         echo "Warning: no match for syscall '${SYSCALL_NAME}', set to 'inout'" >&2
  47         # no match, default to inout
  48         echo "sc_inout"
  49         exit 0
  50 fi
  51
  52 # Get the number of argument
  53 SC_ARGS=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) .*/\2/g' "${TMPFILE}")
  54
  55 if [ "${ARG_NR}" -gt "${SC_ARGS}" ]; then
  56         echo "Error: argument number (${ARG_NR}) is larger than number of syscall arguments (${SC_ARGS})" >&2
  57         exit 1
  58 fi
  59
  60 if [ "${ARG_NR}" == 1 ]; then
  61         SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: (\([^,)]*\).*/\3/g' "${TMPFILE}")
  62 fi
  63
  64 if [ "${ARG_NR}" == 2 ]; then
  65         SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}")
  66 fi
  67
  68 if [ "${ARG_NR}" == 3 ]; then
  69         SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}")
  70 fi
  71
  72 if [ "${ARG_NR}" == 4 ]; then
  73         SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}")
  74 fi
  75
  76 if [ "${ARG_NR}" == 5 ]; then
  77         SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, [^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}")
  78 fi
  79
  80 if [ "${ARG_NR}" == 6 ]; then
  81         SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, [^,]*, [^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}")
  82 fi
  83
  84
  85 if [ "${SC_ARG_TYPE}" = "r" ]; then
  86         echo "sc_in"
  87 fi
  88 if [ "${SC_ARG_TYPE}" = "w" ]; then
  89         echo "sc_out"
  90 fi
  91 if [ "${SC_ARG_TYPE}" = "rw" ]; then
  92         echo "sc_inout"
  93 fi
  94
  95 # EOF