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pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
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* pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
@ 2025-01-14 23:51  Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 6+ messages in thread

From: Tom Lane @ 2025-01-14 23:51 UTC (permalink / raw)
  To: pgsql-committers@lists.postgresql.org

Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c.

In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/cfd7aadebea1997e26cb96f31f8eb9af95affa36

Modified Files
--------------
src/include/port.h                     |  5 ++++-
src/interfaces/libpq/legacy-pqsignal.c | 12 +++++++++---
src/port/pqsignal.c                    |  4 ++++
3 files changed, 17 insertions(+), 4 deletions(-)



^ permalink  raw  reply  [nested|flat] 6+ messages in thread

* pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
@ 2025-01-14 23:51  Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 6+ messages in thread

From: Tom Lane @ 2025-01-14 23:51 UTC (permalink / raw)
  To: pgsql-committers@lists.postgresql.org

Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c.

In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/9a45a89c38f3257b13e09edf382e32fa28b918c2

Modified Files
--------------
src/include/port.h                     |  7 ++++++-
src/interfaces/libpq/legacy-pqsignal.c | 10 +++++++++-
src/port/pqsignal.c                    |  4 ++++
3 files changed, 19 insertions(+), 2 deletions(-)



^ permalink  raw  reply  [nested|flat] 6+ messages in thread

* pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
@ 2025-01-14 23:51  Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 6+ messages in thread

From: Tom Lane @ 2025-01-14 23:51 UTC (permalink / raw)
  To: pgsql-committers@lists.postgresql.org

Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c.

In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/b935691b8b2f7ec7d537b77cb262ee8363f4715c

Modified Files
--------------
src/include/port.h                     |  5 ++++-
src/interfaces/libpq/legacy-pqsignal.c | 12 +++++++++---
src/port/pqsignal.c                    |  4 ++++
3 files changed, 17 insertions(+), 4 deletions(-)



^ permalink  raw  reply  [nested|flat] 6+ messages in thread

* pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
@ 2025-01-14 23:51  Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 6+ messages in thread

From: Tom Lane @ 2025-01-14 23:51 UTC (permalink / raw)
  To: pgsql-committers@lists.postgresql.org

Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c.

In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com

Branch
------
REL_17_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a0dfeae0dc9aca33f3d70eea0fd5f81992562ea0

Modified Files
--------------
src/include/port.h                     |  5 ++++-
src/interfaces/libpq/legacy-pqsignal.c | 10 +++++++++-
src/port/pqsignal.c                    |  4 ++++
3 files changed, 17 insertions(+), 2 deletions(-)



^ permalink  raw  reply  [nested|flat] 6+ messages in thread

* pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
@ 2025-01-14 23:51  Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 6+ messages in thread

From: Tom Lane @ 2025-01-14 23:51 UTC (permalink / raw)
  To: pgsql-committers@lists.postgresql.org

Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c.

In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/02e69313ad0c9687fc6ac90ea0daf74d9e8a6e50

Modified Files
--------------
src/include/port.h                     |  5 ++++-
src/interfaces/libpq/legacy-pqsignal.c | 12 +++++++++---
src/port/pqsignal.c                    |  4 ++++
3 files changed, 17 insertions(+), 4 deletions(-)



^ permalink  raw  reply  [nested|flat] 6+ messages in thread

* pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c
@ 2025-01-14 23:51  Tom Lane <tgl@sss.pgh.pa.us>
  0 siblings, 0 replies; 6+ messages in thread

From: Tom Lane @ 2025-01-14 23:51 UTC (permalink / raw)
  To: pgsql-committers@lists.postgresql.org

Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c.

In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a3b709cf73e0ae2be1259afec9994ff30416f695

Modified Files
--------------
src/include/port.h                     |  5 ++++-
src/interfaces/libpq/legacy-pqsignal.c | 12 +++++++++---
src/port/pqsignal.c                    |  4 ++++
3 files changed, 17 insertions(+), 4 deletions(-)



^ permalink  raw  reply  [nested|flat] 6+ messages in thread


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2025-01-14 23:51 pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c Tom Lane <tgl@sss.pgh.pa.us>
2025-01-14 23:51 pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c Tom Lane <tgl@sss.pgh.pa.us>
2025-01-14 23:51 pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c Tom Lane <tgl@sss.pgh.pa.us>
2025-01-14 23:51 pgsql: Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c Tom Lane <tgl@sss.pgh.pa.us>

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