+# Search for the in/out description of a syscall. This function attempts to find
+# a matching description in the per-architecture description override file (if it exists)
+# and falls back to the generic description file otherwise.
+#
+# Returns 0 if a description was found and written to the output file, 1 otherwise.
+function write_inout_description ()
+{
+ local arch_name=$1
+ local syscall_name=$2
+ local output_file=$3
+ local description_files=("$(dirname "$0")/table-syscall-inout-${arch_name}-override.txt" "$GENERIC_INOUT_DESCRIPTION_FILE")
+ local found=0
+
+ for file in ${description_files[@]}; do
+ if [ ! -f "$file" ]; then
+ continue
+ fi
+
+ # Look for the syscall's in/out description
+ grep "syscall ${syscall_name} " "${file}" > "${output_file}" || true
+
+ # Error out if we got more than one syscall
+ local match_count=$(wc -l < "${output_file}")
+ if [ "${match_count}" -gt 1 ]; then
+ # Fatal error; invalid description file
+ echo "Error: more than one system call match" >&2
+ exit 1
+ elif [ "${match_count}" -eq 1 ]; then
+ # Description found
+ return 0
+ fi
+ done
+
+ return 1
+}
+