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Avoid calling gettext() in signal handlers.
It seems highly unlikely that gettext() can be relied on to be async-signal-safe. psql used to understand that, but someone got it wrong long ago in the src/bin/scripts/ version of handle_sigint, and then the bad idea was perpetuated when those two versions were unified 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 least one 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() before the signal handler is set up. In earlier branches I just made src/bin/scripts/ not localize those messages, as psql did then. (Just for extra unsafety, the src/bin/scripts/ version was invoking 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
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@ -23,6 +23,19 @@
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#include "fe_utils/string_utils.h"
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/*
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* Write a simple string to stderr --- must be safe in a signal handler.
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* We ignore the write() result since there's not much we could do about it.
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* Certain compilers make that harder than it ought to be.
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*/
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#define write_stderr(str) \
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do { \
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const char *str_ = (str); \
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int rc_; \
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rc_ = write(fileno(stderr), str_, strlen(str_)); \
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(void) rc_; \
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} while (0)
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#define PQmblenBounded(s, e) strnlen(s, PQmblen(s, e))
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static PGcancel *volatile cancelConn = NULL;
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@ -485,10 +498,13 @@ handle_sigint(SIGNAL_ARGS)
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if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
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{
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CancelRequested = true;
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fprintf(stderr, _("Cancel request sent\n"));
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write_stderr("Cancel request sent\n");
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}
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else
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fprintf(stderr, _("Could not send cancel request: %s"), errbuf);
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{
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write_stderr("Could not send cancel request: ");
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write_stderr(errbuf);
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}
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}
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else
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CancelRequested = true;
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@ -522,11 +538,14 @@ consoleHandler(DWORD dwCtrlType)
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{
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if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
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{
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fprintf(stderr, _("Cancel request sent\n"));
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CancelRequested = true;
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write_stderr("Cancel request sent\n");
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}
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else
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fprintf(stderr, _("Could not send cancel request: %s"), errbuf);
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{
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write_stderr("Could not send cancel request: ");
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write_stderr(errbuf);
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}
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}
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else
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CancelRequested = true;
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