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https://sourceware.org/git/glibc.git
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2dba5ce7b8
This commit changes the way the list of SYS_* system call macros is created on Linux. glibc now contains a list of all known system calls, and the generated <bits/syscall.h> file defines the SYS_ macro only if the correspnding __NR_ macro is defined by the kernel headers. As a result, glibc does not have to be rebuilt to pick up system calls if the glibc sources already know about them. This means that glibc can be built with older kernel headers, and if the installed kernel headers are upgraded afterwards, additional SYS_ macros become available as long as glibc has a record for those system calls.
100 lines
2.9 KiB
Bash
100 lines
2.9 KiB
Bash
#!/bin/bash
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# Consistency checks for the system call list
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# Copyright (C) 2017 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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export LC_ALL=C
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set -e
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set -o pipefail
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if test $# != 4; then
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echo "error: wrong number of arguments: $#"
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exit 1
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fi
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macros="$1"
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list_nr="$2"
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list_sys="$3"
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GAWK="$4"
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linux_version="$("$GAWK" \
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'/#define LINUX_VERSION_CODE / {print $3}' < "$macros")"
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glibc_linux_version="$("$GAWK" \
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'/#define __GLIBC_LINUX_VERSION_CODE / {print $3}' < "$macros")"
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echo "info: LINUX_VERSION_CODE: $linux_version"
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echo "info: __GLIBC_LINUX_VERSION_CODE: $glibc_linux_version"
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# Ignore the subrelease in the comparison.
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if test $(expr "$glibc_linux_version" / 256) \
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-lt $(expr "$linux_version" / 256); then
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echo "info: The kernel major/minor version is newer than the glibc version"
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kernel_newer=true
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else
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kernel_newer=false
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fi
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echo
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errors=0
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# Use getpid as a system call which is expected to be always defined.
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# alpha uses getxpid instead, so it is permitted as an alternative.
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if ! grep -E -q '^getx?pid$' -- "$list_nr"; then
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echo "error: __NR_getpid not defined"
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errors=1
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fi
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if ! grep -E -q '^getx?pid$' -- "$list_sys"; then
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echo "error: SYS_getpid not defined"
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errors=1
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fi
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comm_1="$(mktemp)"
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comm_2="$(mktemp)"
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comm_result="$(mktemp)"
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cleanup () {
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rm -f -- "$comm_1" "$comm_2" "$comm_result"
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}
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trap cleanup 0
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sort -o "$comm_1" -- "$list_nr"
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sort -o "$comm_2" -- "$list_sys"
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# Check for missing SYS_* macros.
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comm --check-order -2 -3 -- "$comm_1" "$comm_2" > "$comm_result"
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if test -s "$comm_result"; then
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echo "error: These system calls need to be added to syscall-names.list:"
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cat -- "$comm_result"
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# This is only an error if our version is older than the kernel
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# version because we cannot predict future kernel development.
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if $kernel_newer; then
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echo
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echo "warning: This error has been ignored because the glibc"
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echo "warning: system call list is older than the kernel version."
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else
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errors=1
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fi
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fi
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# Check for additional SYS_* macros.
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comm --check-order -1 -3 -- "$comm_1" "$comm_2" > "$comm_result"
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if test -s "$comm_result"; then
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echo "error: The following system calls have unexpected SYS_* macros:"
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cat -- "$comm_result"
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errors=1
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fi
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exit "$errors"
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