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This patch is from the upstream release/2.20/master branch, which is a
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backport containing only the syscalls.list changes in commit 016495b8 in
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master.
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commit adba20cf74bc6ea3910afe57d40ed755c92c2ddb
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Author: Stefan Liebler <stli@linux.vnet.ibm.com>
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Date: Thu Mar 3 08:24:18 2016 +0100
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S390: Do not use direct socket syscalls if build on kernels >= 4.3. [BZ #19682]
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Beginning with Linux 4.3, the kernel headers contain direct
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system call numbers __NR_socket etc. on s390x. On older kernels,
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the socket-multiplexer syscall __NR_socketcall was used.
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To enable these new syscalls, the patch
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"S390: Call direct system calls for socket operations."
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(https://sourceware.org/git/?p=glibc.git;a=commit;h=016495b818cb61df7d0d10e6db54074271b3e3a5)
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was applied upstream.
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If glibc 2.23 is configured with --enable-kernel=4.3 and newer,
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the direct socket syscalls are used.
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For older kernels, the socket-multiplexer syscall is used instead.
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In glibc 2.22 and earlier, this patch is not applied.
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If you build glibc on a kernel < 4.3, the socket-multiplexer
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syscall is used. But if you build glibc on kernel >= 4.3, the
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direct socket-syscalls are used. If you install this glibc on a
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kernel < 4.3, all socket operations will fail.
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See "Bug 19682 - s390x: Incorrect syscall definitions cause
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breakage with Linux 4.3 headers"
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(https://sourceware.org/bugzilla/show_bug.cgi?id=19682)
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The configure switch --enable-kernel does not influence this
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behaviour on older glibc-releases.
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The solution is to remove the direct socket-syscalls in
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sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
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(this patch) on older glibc-releases as it was done by the
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upstream patch, too. These entries were never used on s390x,
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but the c-files in sysdeps/unix/sysv/linux/.
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After this removal, the behaviour of the socket functions are
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not changed compared to the original glibc release version
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and the socket-multiplexer-syscall is always used.
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Index: b/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
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===================================================================
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--- a/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
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+++ b/sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list
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@@ -14,22 +14,3 @@ shmget - shmget i:iii __shmget shmget
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semop - semop i:ipi __semop semop
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semget - semget i:iii __semget semget
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semctl - semctl i:iiii __semctl semctl
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-
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-# proper socket implementations:
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-accept - accept Ci:iBN __libc_accept __accept accept
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-bind - bind i:ipi __bind bind
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-connect - connect Ci:ipi __libc_connect __connect connect
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-getpeername - getpeername i:ipp __getpeername getpeername
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-getsockname - getsockname i:ipp __getsockname getsockname
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-getsockopt - getsockopt i:iiiBN __getsockopt getsockopt
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-listen - listen i:ii __listen listen
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-recv - recv Ci:ibni __libc_recv __recv recv
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-recvfrom - recvfrom Ci:ibniBN __libc_recvfrom __recvfrom recvfrom
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-recvmsg - recvmsg Ci:ipi __libc_recvmsg __recvmsg recvmsg
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-send - send Ci:ibni __libc_send __send send
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-sendmsg - sendmsg Ci:ipi __libc_sendmsg __sendmsg sendmsg
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-sendto - sendto Ci:ibnibn __libc_sendto __sendto sendto
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-setsockopt - setsockopt i:iiibn __setsockopt setsockopt
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-shutdown - shutdown i:ii __shutdown shutdown
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-socket - socket i:iii __socket socket
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-socketpair - socketpair i:iiif __socketpair socketpair
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