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[PATCH] <bits/syscall.h>: Use an arch-independent system call list on Linux


Downstream, we have the problem that we need to deliver our glibc packages before the kernel team finishes backporting system calls. This means that the final glibc build before a release does not contain all the SYS_* macros supported by the kernel headers.

I would have liked to address this by phasing out the SYS_* macros, but this suggestion was not received favorably during a previous discussion.

An ideal solution would generate the SYS_* macros when the glibc development package is installed, based on the already-installed kernel headers. Our RPM version does not support delayed script execution, so there is significant risk that we end up with a dependency loop, due to which the generation step could fail.

So I'm proposing the attached patch as an alternative. It uses a list of system call names and generates a <bits/syscall.h> file from that which has items of the form

#ifdef __NR_write
# define SYS_write __NR_write
#endif

The idea is to define only those SYS_ macros which actually exist in the kernel headers as __NR_ macros. Therefore, we only need a single system call list across all architectures, and the generated header file is no longer architecture-specific, either. The -dM-based macro extraction remains as a (much simplified) test case. It fails if the kernel headers contain __NR_ macros not currently listed in the glibc source tree.

I think the increased predictability of glibc builds might be worth it upstream as well. The cost is that we now have to update the list periodically, but that can be done when the kernel version embedded in scripts/build-many-glibcs.py is increased.

The included list of system call names is based on the currently building build-many-glibcs.py targets (that is, hppa and coldfire are missing). We can easily adjust it once we get more buildable architectures.

Comments?

Thanks,
Florian
<bits/syscall.h>: Use an arch-independent system call list on Linux

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, there 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.

2017-04-05  Florian Weimer  <fweimer@redhat.com>

	Store supported list of SYS_* system calls in the source tree.
	* sysdeps/unix/sysv/linux/Makefile (bits/syscall.h): Generate from
	list file.
	[$(subdir) = misc] (tests): Add tst-syscall-list.
	[$(subdir) = misc] (tests-special): Add tst-syscall-list.out
	[$(subdir) = misc] (tst-syscall-list-macros.list)
	(tst-syscall-list-nr.list, tst-syscall-list-sys.list): Helper
	targets for new tst-syscall-list test.
	(tst-syscall-list.out): Run test script tst-syscall-list.sh.
	* sysdeps/unix/sysv/linux/syscall-names.list: New file.
	* sysdeps/unix/sysv/linux/gen-syscall-h.awk: Likewise.
	* sysdeps/unix/sysv/linux/filter-nr-syscalls.awk: Likewise.
	* sysdeps/unix/sysv/linux/tst-syscall-list.sh: Likewise.

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 1872cdb..5573c4e 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -45,75 +45,46 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 tests += tst-clone tst-clone2 tst-fanotify tst-personality tst-quota \
 	 tst-sync_file_range test-errno-linux
 
-# Generate the list of SYS_* macros for the system calls (__NR_* macros).
+# Generate the list of SYS_* macros for the system calls (__NR_*
+# macros).  The file syscall-names.list contains all possible system
+# call names, and the generated header file produces SYS_* macros for
+# the __NR_* macros which are actually defined.
 
-# If there is more than one syscall list for different architecture
-# variants, the CPU/Makefile defines abi-variants to be a list of names
-# for those variants (e.g. 32 64), and, for each variant, defines
-# abi-$(variant)-options to be compiler options to cause <asm/unistd.h>
-# to define the desired list of syscalls and abi-$(variant)-condition to
-# be the condition for those options to use in a C #if condition.
-# abi-includes may be defined to a list of headers to include
-# in the generated header, if the default does not suffice.
-#
-# The generated header is compiled with `-ffreestanding' to avoid any
-# circular dependencies against the installed implementation headers.
-# Such a dependency would require the implementation header to be
-# installed before the generated header could be built (See bug 15711).
-# In current practice the generated header dependencies do not include
-# any of the implementation headers removed by the use of `-ffreestanding'.
-
-$(objpfx)bits/syscall%h $(objpfx)bits/syscall%d: ../sysdeps/unix/sysv/linux/sys/syscall.h
+generated += bits/syscall.h
+$(objpfx)bits/syscall.h: \
+  ../sysdeps/unix/sysv/linux/gen-syscall-h.awk \
+  ../sysdeps/unix/sysv/linux/syscall-names.list
 	$(make-target-directory)
-	{ \
-	 echo '/* Generated at libc build time from kernel syscall list.  */';\
-	 echo ''; \
-	 echo '#ifndef _SYSCALL_H'; \
-	 echo '# error "Never use <bits/syscall.h> directly; include <sys/syscall.h> instead."'; \
-	 echo '#endif'; \
-	 echo ''; \
-	 $(foreach h,$(abi-includes), echo '#include <$(h)>';) \
-	 echo ''; \
-	 $(if $(abi-variants), \
-	 $(foreach v,$(abi-variants),\
-	 $(CC) -ffreestanding -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
-	       -x c $(sysincludes) $< $(abi-$(v)-options) \
-	       -D_LIBC -dM | \
-	 sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \
-	 LC_ALL=C sort > $(@:.d=.h).new$(v); \
-	 $(if $(abi-$(v)-condition),\
-	 echo '#if $(abi-$(v)-condition)';) \
-	 cat $(@:.d=.h).new$(v); \
-	 $(if $(abi-$(v)-condition),echo '#endif';) \
-	 rm -f $(@:.d=.h).new$(v); \
-	 ), \
-	 $(CC) -ffreestanding -E -MD -MP -MF $(@:.h=.d)-t$(v) -MT '$(@:.d=.h) $(@:.h=.d)' \
-	       -x c $(sysincludes) $< \
-	       -D_LIBC -dM | \
-	 sed -n 's@^#define __NR_\([^ ]*\) .*$$@#define SYS_\1 __NR_\1@p' | \
-	 LC_ALL=C sort;) \
-	} > $(@:.d=.h).new
-	mv -f $(@:.d=.h).new $(@:.d=.h)
-ifdef abi-variants
-ifneq (,$(objpfx))
-	sed $(sed-remove-objpfx) \
-	 $(foreach v,$(abi-variants),$(@:.h=.d)-t$(v)) > $(@:.h=.d)-t3
-else
-	cat $(foreach v,$(abi-variants),$(@:.h=.d)-t$(v)) \
-	 > $(@:.h=.d)-t3
-endif
-	rm -f $(foreach v,$(abi-variants),$(@:.h=.d)-t$(v))
-	mv -f $(@:.h=.d)-t3 $(@:.h=.d)
-else
-	mv -f $(@:.h=.d)-t $(@:.h=.d)
-endif
+	$(AWK) -f $^ > $@-tmp
+	$(move-if-change) $@-tmp $@
 
-ifndef no_deps
-# Get the generated list of dependencies (probably /usr/include/asm/unistd.h).
--include $(objpfx)bits/syscall.d
-endif
-generated += bits/syscall.h bits/syscall.d
-endif
+# All macros defined by <sys/syscall.h>.  Include <bits/syscall.h>
+# explicitly because <sys/sycall.h> skips it if _LIBC is defined.
+$(objpfx)tst-syscall-list-macros.list: \
+  $(objpfx)bits/syscall.h ../sysdeps/unix/sysv/linux/sys/syscall.h
+	printf '#include <sys/syscall.h>\n#include <bits/syscall.h>\n' | \
+	  $(CC) -E -o $@-tmp $(CFLAGS) $(CPPFLAGS) -x c - -dM
+	$(move-if-change) $@-tmp $@
+
+# __NR_* system call names.  Used by the test below.
+$(objpfx)tst-syscall-list-nr.list: \
+  ../sysdeps/unix/sysv/linux/filter-nr-syscalls.awk \
+  $(objpfx)tst-syscall-list-macros.list
+	$(AWK) -f $^ > $@-tmp
+	$(move-if-change) $@-tmp $@
+
+# SYS_* system call names.  Used by the test below.
+$(objpfx)tst-syscall-list-sys.list: $(objpfx)tst-syscall-list-macros.list
+	$(AWK) '/^#define SYS_/ { print substr($$2, 5) }' $< > $@-tmp
+	$(move-if-change) $@-tmp $@
+
+tests-special += $(objpfx)tst-syscall-list.out
+$(objpfx)tst-syscall-list.out: \
+  ../sysdeps/unix/sysv/linux/tst-syscall-list.sh \
+  $(objpfx)tst-syscall-list-nr.list $(objpfx)tst-syscall-list-sys.list
+	$(BASH) $^ > $@; $(evaluate-test)
+
+endif # $(subdir) == misc
 
 ifeq ($(subdir),time)
 sysdep_headers += sys/timex.h bits/timex.h
diff --git a/sysdeps/unix/sysv/linux/filter-nr-syscalls.awk b/sysdeps/unix/sysv/linux/filter-nr-syscalls.awk
new file mode 100644
index 0000000..15b052a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/filter-nr-syscalls.awk
@@ -0,0 +1,35 @@
+# Filter preprocessor __NR_* macros and extract system call names.
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# Skip reserved system calls.
+/^#define __NR_(unused|reserved)[0-9]+ / {
+    next;
+}
+
+# Skip pseudo-system calls which describe ranges.
+/^#define __NR_(syscalls|arch_specific_syscall|(OABI_)?SYSCALL_BASE) / {
+    next;
+}
+/^#define __NR_(|64_|[NO]32_)Linux(_syscalls)? / {
+    next;
+}
+
+# Print the remaining _NR_* macros as system call names.
+/^#define __NR_/ {
+    print substr($2, 6);
+}
diff --git a/sysdeps/unix/sysv/linux/gen-syscall-h.awk b/sysdeps/unix/sysv/linux/gen-syscall-h.awk
new file mode 100644
index 0000000..0a27b3c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/gen-syscall-h.awk
@@ -0,0 +1,75 @@
+# Generate SYS_* macros from a list in a text file.
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# Emit a conditional definition for SYS_NAME.
+function emit(name) {
+    print "#ifdef __NR_" name;
+    print "# define SYS_" name " __NR_" name;
+    print "#endif";
+    print "";
+}
+
+# Bail out with an error.
+function fatal(message) {
+    print FILENAME ":" FNR ": " message > "/dev/stderr";
+    exit 1;
+}
+
+BEGIN {
+    name = "";
+    kernel = "";
+}
+
+# Skip empty lines and comments.
+/^\s*(|#.*)$/ {
+    next;
+}
+
+# Kernel version.  Used for documentation purposes only.
+/^kernel [0-9.]+$/ {
+    if (kernel != "") {
+        fatal("duplicate kernel directive");
+    }
+    kernel = $2;
+    print "/* Generated at libc build time from syscall list.  */";
+    print "/* The system call list corresponds to kernel " kernel ".  */";
+    print "";
+    print "#ifndef _SYSCALL_H"
+    print "# error \"Never use <bits/syscall.h> directly; include <sys/syscall.h> instead.\"";
+    print "#endif";
+    print "";
+    next;
+}
+
+# If there is just one word, it is a system call.
+/^[a-zA-Z_][a-zA-Z0-9_]+$/ {
+    if (kernel == "") {
+        fatal("expected kernel directive before this line");
+    }
+    if ($1 <= name) {
+        fatal("name " name " violates ordering");
+    }
+    emit($1);
+    name = $1;
+    next;
+}
+
+# The rest has to be syntax errors.
+// {
+    fatal("unrecognized syntax");
+}
diff --git a/sysdeps/unix/sysv/linux/syscall-names.list b/sysdeps/unix/sysv/linux/syscall-names.list
new file mode 100644
index 0000000..9a47755
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/syscall-names.list
@@ -0,0 +1,594 @@
+# List of all known Linux system calls.
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# This file contains the list of system call names names.  It has to
+# remain in alphabetica order.  Lines which start with # are treated
+# as comments.  This file can list all potential system calls.  The
+# names are only used if the installed kernel headers also provide
+# them.
+
+# The list of system calls is current as of Linux 4.10.
+kernel 4.10
+
+FAST_atomic_update
+FAST_cmpxchg
+FAST_cmpxchg64
+_llseek
+_newselect
+_sysctl
+accept
+accept4
+access
+acct
+add_key
+adjtimex
+afs_syscall
+alarm
+arch_prctl
+arm_fadvise64_64
+arm_sync_file_range
+atomic_barrier
+atomic_cmpxchg_32
+bdflush
+bind
+bpf
+break
+brk
+cachectl
+cacheflush
+capget
+capset
+chdir
+chmod
+chown
+chown32
+chroot
+clock_adjtime
+clock_getres
+clock_gettime
+clock_nanosleep
+clock_settime
+clone
+clone2
+close
+cmpxchg_badaddr
+connect
+copy_file_range
+creat
+create_module
+delete_module
+dipc
+dup
+dup2
+dup3
+epoll_create
+epoll_create1
+epoll_ctl
+epoll_ctl_old
+epoll_pwait
+epoll_wait
+epoll_wait_old
+eventfd
+eventfd2
+exec_with_loader
+execv
+execve
+execveat
+exit
+exit_group
+faccessat
+fadvise64
+fadvise64_64
+fallocate
+fanotify_init
+fanotify_mark
+fchdir
+fchmod
+fchmodat
+fchown
+fchown32
+fchownat
+fcntl
+fcntl64
+fdatasync
+fgetxattr
+finit_module
+flistxattr
+flock
+fork
+fremovexattr
+fsetxattr
+fstat
+fstat64
+fstatat64
+fstatfs
+fstatfs64
+fsync
+ftime
+ftruncate
+ftruncate64
+futex
+futimesat
+get_kernel_syms
+get_mempolicy
+get_robust_list
+get_thread_area
+getcpu
+getcwd
+getdents
+getdents64
+getdomainname
+getdtablesize
+getegid
+getegid32
+geteuid
+geteuid32
+getgid
+getgid32
+getgroups
+getgroups32
+gethostname
+getitimer
+getpagesize
+getpeername
+getpgid
+getpgrp
+getpid
+getpmsg
+getppid
+getpriority
+getrandom
+getresgid
+getresgid32
+getresuid
+getresuid32
+getrlimit
+getrusage
+getsid
+getsockname
+getsockopt
+gettid
+gettimeofday
+getuid
+getuid32
+getunwind
+getxattr
+getxgid
+getxpid
+getxuid
+gtty
+idle
+init_module
+inotify_add_watch
+inotify_init
+inotify_init1
+inotify_rm_watch
+io_cancel
+io_destroy
+io_getevents
+io_setup
+io_submit
+ioctl
+ioperm
+iopl
+ioprio_get
+ioprio_set
+ipc
+kcmp
+kern_features
+kexec_file_load
+kexec_load
+keyctl
+kill
+lchown
+lchown32
+lgetxattr
+link
+linkat
+listen
+listxattr
+llistxattr
+llseek
+lock
+lookup_dcookie
+lremovexattr
+lseek
+lsetxattr
+lstat
+lstat64
+madvise
+mbind
+membarrier
+memfd_create
+memory_ordering
+migrate_pages
+mincore
+mkdir
+mkdirat
+mknod
+mknodat
+mlock
+mlock2
+mlockall
+mmap
+mmap2
+modify_ldt
+mount
+move_pages
+mprotect
+mpx
+mq_getsetattr
+mq_notify
+mq_open
+mq_timedreceive
+mq_timedsend
+mq_unlink
+mremap
+msgctl
+msgget
+msgrcv
+msgsnd
+msync
+multiplexer
+munlock
+munlockall
+munmap
+name_to_handle_at
+nanosleep
+newfstatat
+nfsservctl
+ni_syscall
+nice
+old_adjtimex
+oldfstat
+oldlstat
+oldolduname
+oldstat
+oldumount
+olduname
+open
+open_by_handle_at
+openat
+osf_adjtime
+osf_afs_syscall
+osf_alt_plock
+osf_alt_setsid
+osf_alt_sigpending
+osf_asynch_daemon
+osf_audcntl
+osf_audgen
+osf_chflags
+osf_execve
+osf_exportfs
+osf_fchflags
+osf_fdatasync
+osf_fpathconf
+osf_fstat
+osf_fstatfs
+osf_fstatfs64
+osf_fuser
+osf_getaddressconf
+osf_getdirentries
+osf_getdomainname
+osf_getfh
+osf_getfsstat
+osf_gethostid
+osf_getitimer
+osf_getlogin
+osf_getmnt
+osf_getrusage
+osf_getsysinfo
+osf_gettimeofday
+osf_kloadcall
+osf_kmodcall
+osf_lstat
+osf_memcntl
+osf_mincore
+osf_mount
+osf_mremap
+osf_msfs_syscall
+osf_msleep
+osf_mvalid
+osf_mwakeup
+osf_naccept
+osf_nfssvc
+osf_ngetpeername
+osf_ngetsockname
+osf_nrecvfrom
+osf_nrecvmsg
+osf_nsendmsg
+osf_ntp_adjtime
+osf_ntp_gettime
+osf_old_creat
+osf_old_fstat
+osf_old_getpgrp
+osf_old_killpg
+osf_old_lstat
+osf_old_open
+osf_old_sigaction
+osf_old_sigblock
+osf_old_sigreturn
+osf_old_sigsetmask
+osf_old_sigvec
+osf_old_stat
+osf_old_vadvise
+osf_old_vtrace
+osf_old_wait
+osf_oldquota
+osf_pathconf
+osf_pid_block
+osf_pid_unblock
+osf_plock
+osf_priocntlset
+osf_profil
+osf_proplist_syscall
+osf_reboot
+osf_revoke
+osf_sbrk
+osf_security
+osf_select
+osf_set_program_attributes
+osf_set_speculative
+osf_sethostid
+osf_setitimer
+osf_setlogin
+osf_setsysinfo
+osf_settimeofday
+osf_shmat
+osf_signal
+osf_sigprocmask
+osf_sigsendset
+osf_sigstack
+osf_sigwaitprim
+osf_sstk
+osf_stat
+osf_statfs
+osf_statfs64
+osf_subsys_info
+osf_swapctl
+osf_swapon
+osf_syscall
+osf_sysinfo
+osf_table
+osf_uadmin
+osf_usleep_thread
+osf_uswitch
+osf_utc_adjtime
+osf_utc_gettime
+osf_utimes
+osf_utsname
+osf_wait4
+osf_waitid
+pause
+pciconfig_iobase
+pciconfig_read
+pciconfig_write
+perf_event_open
+perfctr
+perfmonctl
+personality
+pipe
+pipe2
+pivot_root
+pkey_alloc
+pkey_free
+pkey_mprotect
+poll
+ppoll
+prctl
+pread64
+preadv
+preadv2
+prlimit64
+process_vm_readv
+process_vm_writev
+prof
+profil
+pselect6
+ptrace
+putpmsg
+pwrite64
+pwritev
+pwritev2
+query_module
+quotactl
+read
+readahead
+readdir
+readlink
+readlinkat
+readv
+reboot
+recv
+recvfrom
+recvmmsg
+recvmsg
+remap_file_pages
+removexattr
+rename
+renameat
+renameat2
+request_key
+restart_syscall
+rmdir
+rt_sigaction
+rt_sigpending
+rt_sigprocmask
+rt_sigqueueinfo
+rt_sigreturn
+rt_sigsuspend
+rt_sigtimedwait
+rt_tgsigqueueinfo
+rtas
+s390_pci_mmio_read
+s390_pci_mmio_write
+s390_runtime_instr
+sched_get_affinity
+sched_get_priority_max
+sched_get_priority_min
+sched_getaffinity
+sched_getattr
+sched_getparam
+sched_getscheduler
+sched_rr_get_interval
+sched_set_affinity
+sched_setaffinity
+sched_setattr
+sched_setparam
+sched_setscheduler
+sched_yield
+seccomp
+security
+select
+semctl
+semget
+semop
+semtimedop
+send
+sendfile
+sendfile64
+sendmmsg
+sendmsg
+sendto
+set_mempolicy
+set_robust_list
+set_thread_area
+set_tid_address
+setdomainname
+setfsgid
+setfsgid32
+setfsuid
+setfsuid32
+setgid
+setgid32
+setgroups
+setgroups32
+sethae
+sethostname
+setitimer
+setns
+setpgid
+setpgrp
+setpriority
+setregid
+setregid32
+setresgid
+setresgid32
+setresuid
+setresuid32
+setreuid
+setreuid32
+setrlimit
+setsid
+setsockopt
+settimeofday
+setuid
+setuid32
+setxattr
+sgetmask
+shmat
+shmctl
+shmdt
+shmget
+shutdown
+sigaction
+sigaltstack
+signal
+signalfd
+signalfd4
+sigpending
+sigprocmask
+sigreturn
+sigsuspend
+socket
+socketcall
+socketpair
+splice
+spu_create
+spu_run
+ssetmask
+stat
+stat64
+statfs
+statfs64
+stime
+stty
+subpage_prot
+swapcontext
+swapoff
+swapon
+switch_endian
+symlink
+symlinkat
+sync
+sync_file_range
+sync_file_range2
+syncfs
+sys_debug_setcontext
+sys_epoll_create
+sys_epoll_ctl
+sys_epoll_wait
+syscall
+sysfs
+sysinfo
+syslog
+sysmips
+tee
+tgkill
+time
+timer_create
+timer_delete
+timer_getoverrun
+timer_gettime
+timer_settime
+timerfd
+timerfd_create
+timerfd_gettime
+timerfd_settime
+times
+tkill
+truncate
+truncate64
+tuxcall
+ugetrlimit
+ulimit
+umask
+umount
+umount2
+uname
+unlink
+unlinkat
+unshare
+uselib
+userfaultfd
+ustat
+utime
+utimensat
+utimes
+utrap_install
+vfork
+vhangup
+vm86
+vm86old
+vmsplice
+vserver
+wait4
+waitid
+waitpid
+write
+writev
diff --git a/sysdeps/unix/sysv/linux/tst-syscall-list.sh b/sysdeps/unix/sysv/linux/tst-syscall-list.sh
new file mode 100644
index 0000000..f48b7cd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-syscall-list.sh
@@ -0,0 +1,72 @@
+#!/bin/bash
+# Consistency checks for the system call list
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+export LC_ALL=C
+set -e
+set -o pipefail
+
+if test $# != 2 ; then
+    echo "error: wrong number of arguments: $#"
+    exit 1
+fi
+
+list_nr="$1"
+list_sys="$2"
+
+errors=0
+
+# Use getpid as a system call which is expected to be always defined.
+# alpha uses getxpid instead, so it is permitted as an alternative.
+if ! grep -E -q '^getx?pid$' -- "$list_nr" ; then
+    echo "error: __NR_getpid not defined"
+    errors=1
+fi
+if ! grep -E -q '^getx?pid$' -- "$list_sys" ; then
+    echo "error: SYS_getpid not defined"
+    errors=1
+fi
+
+comm_1="$(mktemp)"
+comm_2="$(mktemp)"
+comm_result="$(mktemp)"
+cleanup () {
+    rm -f -- "$comm_1" "$comm_2" "$comm_result"
+}
+trap cleanup 0
+
+sort -o "$comm_1" -- "$list_nr"
+sort -o "$comm_2" -- "$list_sys"
+
+# Check for missing SYS_* macros.
+comm --check-order -2 -3 -- "$comm_1" "$comm_2" > "$comm_result"
+if test -s "$comm_result"; then
+    echo "error: These system calls need to be added to syscall-names.list:"
+    cat -- "$comm_result"
+    errors=1
+fi
+
+# Check for additional SYS_* macros.
+comm --check-order -1 -3 -- "$comm_1" "$comm_2" > "$comm_result"
+if test -s "$comm_result"; then
+    echo "error: The following system calls have unexpected SYS_* macros:"
+    cat -- "$comm_result"
+    errors=1
+fi
+
+exit "$errors"

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