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Commit2131c04

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Avoid calling gettext() in signal handlers.
It seems highly unlikely that gettext() can be relied on to beasync-signal-safe. psql used to understand that, but someone gotit wrong long ago in the src/bin/scripts/ version of handle_sigint,and then the bad idea was perpetuated when those two versions wereunified into src/fe_utils/cancel.c.I'm unsure why there have not been field complaints about this... maybe gettext() is signal-safe once it's translated at leastone message? But we have no business assuming any such thing.In cancel.c (v13 and up), I preserved our ability to localize"Cancel request sent" messages by invoking gettext() beforethe signal handler is set up. In earlier branches I just madesrc/bin/scripts/ not localize those messages, as psql did then.(Just for extra unsafety, the src/bin/scripts/ version wasinvoking fprintf() from a signal handler. Sigh.)Noted while fixing signal-safety issues in PQcancel() itself.Back-patch to all supported branches.Discussion:https://postgr.es/m/2937814.1641960929@sss.pgh.pa.us
1 parentf3f467b commit2131c04

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‎src/fe_utils/cancel.c

Lines changed: 16 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -42,6 +42,13 @@
4242
*/
4343
staticPGcancel*volatilecancelConn=NULL;
4444

45+
/*
46+
* Predetermined localized error strings --- needed to avoid trying
47+
* to call gettext() from a signal handler.
48+
*/
49+
staticconstchar*cancel_sent_msg=NULL;
50+
staticconstchar*cancel_not_sent_msg=NULL;
51+
4552
/*
4653
* CancelRequested is set when we receive SIGINT (or local equivalent).
4754
* There is no provision in this module for resetting it; but applications
@@ -158,11 +165,11 @@ handle_sigint(SIGNAL_ARGS)
158165
{
159166
if (PQcancel(cancelConn,errbuf,sizeof(errbuf)))
160167
{
161-
write_stderr(_("Cancel request sent\n"));
168+
write_stderr(cancel_sent_msg);
162169
}
163170
else
164171
{
165-
write_stderr(_("Could not send cancel request: "));
172+
write_stderr(cancel_not_sent_msg);
166173
write_stderr(errbuf);
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}
168175
}
@@ -179,6 +186,9 @@ void
179186
setup_cancel_handler(void (*callback) (void))
180187
{
181188
cancel_callback=callback;
189+
cancel_sent_msg=_("Cancel request sent\n");
190+
cancel_not_sent_msg=_("Could not send cancel request: ");
191+
182192
pqsignal(SIGINT,handle_sigint);
183193
}
184194

@@ -203,11 +213,11 @@ consoleHandler(DWORD dwCtrlType)
203213
{
204214
if (PQcancel(cancelConn,errbuf,sizeof(errbuf)))
205215
{
206-
write_stderr(_("Cancel request sent\n"));
216+
write_stderr(cancel_sent_msg);
207217
}
208218
else
209219
{
210-
write_stderr(_("Could not send cancel request: "));
220+
write_stderr(cancel_not_sent_msg);
211221
write_stderr(errbuf);
212222
}
213223
}
@@ -225,6 +235,8 @@ void
225235
setup_cancel_handler(void (*callback) (void))
226236
{
227237
cancel_callback=callback;
238+
cancel_sent_msg=_("Cancel request sent\n");
239+
cancel_not_sent_msg=_("Could not send cancel request: ");
228240

229241
InitializeCriticalSection(&cancelConnLock);
230242

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