1#!/bin/bash
2# Consistency checks for the system call list
3# Copyright (C) 2017-2022 Free Software Foundation, Inc.
4# This file is part of the GNU C Library.
5#
6# The GNU C Library is free software; you can redistribute it and/or
7# modify it under the terms of the GNU Lesser General Public
8# License as published by the Free Software Foundation; either
9# version 2.1 of the License, or (at your option) any later version.
10#
11# The GNU C Library is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14# Lesser General Public License for more details.
15#
16# You should have received a copy of the GNU Lesser General Public
17# License along with the GNU C Library; if not, see
18# <https://www.gnu.org/licenses/>.
19
20export LC_ALL=C
21set -e
22set -o pipefail
23
24if test $# != 4; then
25    echo "error: wrong number of arguments: $#"
26    exit 1
27fi
28
29macros="$1"
30list_nr="$2"
31list_sys="$3"
32GAWK="$4"
33
34linux_version="$("$GAWK" \
35  '/#define LINUX_VERSION_CODE / {print $3}' < "$macros")"
36glibc_linux_version="$("$GAWK" \
37  '/#define __GLIBC_LINUX_VERSION_CODE / {print $3}' < "$macros")"
38
39echo "info: LINUX_VERSION_CODE: $linux_version"
40echo "info: __GLIBC_LINUX_VERSION_CODE: $glibc_linux_version"
41# Ignore the subrelease in the comparison.
42if test $(expr "$glibc_linux_version" / 256) \
43        -lt $(expr "$linux_version" / 256); then
44    echo "info: The kernel major/minor version is newer than the glibc version"
45    kernel_newer=true
46else
47    kernel_newer=false
48fi
49echo
50
51errors=0
52
53# Use getpid as a system call which is expected to be always defined.
54# alpha uses getxpid instead, so it is permitted as an alternative.
55if ! grep -E -q '^getx?pid$' -- "$list_nr"; then
56    echo "error: __NR_getpid not defined"
57    errors=1
58fi
59if ! grep -E -q '^getx?pid$' -- "$list_sys"; then
60    echo "error: SYS_getpid not defined"
61    errors=1
62fi
63
64comm_1="$(mktemp)"
65comm_2="$(mktemp)"
66comm_result="$(mktemp)"
67cleanup () {
68    rm -f -- "$comm_1" "$comm_2" "$comm_result"
69}
70trap cleanup 0
71
72sort -o "$comm_1" -- "$list_nr"
73sort -o "$comm_2" -- "$list_sys"
74
75# Check for missing SYS_* macros.
76comm --check-order -2 -3 -- "$comm_1" "$comm_2" > "$comm_result"
77if test -s "$comm_result"; then
78    echo "error: These system calls need to be added to syscall-names.list:"
79    cat -- "$comm_result"
80    # This is only an error if our version is older than the kernel
81    # version because we cannot predict future kernel development.
82    if $kernel_newer; then
83        echo
84        echo "warning: This error has been ignored because the glibc"
85        echo "warning: system call list is older than the kernel version."
86    else
87        errors=1
88    fi
89fi
90
91# Check for additional SYS_* macros.
92comm --check-order -1 -3 -- "$comm_1" "$comm_2" > "$comm_result"
93if test -s "$comm_result"; then
94    echo "error: The following system calls have unexpected SYS_* macros:"
95    cat -- "$comm_result"
96    errors=1
97fi
98
99exit "$errors"
100