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Avoid calling pqsignal() with invalid signals on Windows frontends.

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As noted by the comment at the top of port/pqsignal.c, Windows
frontend programs can only use pqsignal() with the 6 signals
required by C.  Most places avoid using invalid signals via #ifndef
WIN32, but initdb and pg_test_fsync check whether the signal itself
is defined, which doesn't work because win32_port.h defines many
extra signals for the signal emulation code.  pg_regress seems to
have missed the memo completely.  These issues aren't causing any
real problems today because nobody checks the return value of
pqsignal(), but a follow-up commit will add some error checking.

To fix, surround all frontend calls to pqsignal() that use signals
that are invalid on Windows with #ifndef WIN32.  We cannot simply
skip defining the extra signals in win32_port.h for frontends
because they are needed in places such as pgkill().

Reviewed-by: Thomas Munro
Discussion: https://postgr.es/m/Z4chOKfnthRH71mw%40nathan
This commit is contained in:
Nathan Bossart
2025-01-16 15:56:39 -06:00
parent d7674c9fab
commit 5cda4fdb0b
3 changed files with 13 additions and 19 deletions
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19
src/bin/initdb/initdb.c
View File

@@ -2874,27 +2874,18 @@ setup_text_search(void)
void
setup_signals(void)
{
/* some of these are not valid on Windows */
#ifdef SIGHUP
pqsignal(SIGHUP, trapsig);
#endif
#ifdef SIGINT
pqsignal(SIGINT, trapsig);
#endif
#ifdef SIGQUIT
pqsignal(SIGQUIT, trapsig);
#endif
#ifdef SIGTERM
pqsignal(SIGTERM, trapsig);
#endif
/* the following are not valid on Windows */
#ifndef WIN32
pqsignal(SIGHUP, trapsig);
pqsignal(SIGQUIT, trapsig);
/* Ignore SIGPIPE when writing to backend, so we can clean up */
#ifdef SIGPIPE
pqsignal(SIGPIPE, SIG_IGN);
#endif
/* Prevent SIGSYS so we can probe for kernel calls that might not work */
#ifdef SIGSYS
pqsignal(SIGSYS, SIG_IGN);
#endif
}

5
src/bin/pg_test_fsync/pg_test_fsync.c
View File

@@ -112,11 +112,10 @@ main(int argc, char *argv[])
/* Prevent leaving behind the test file */
pqsignal(SIGINT, signal_cleanup);
pqsignal(SIGTERM, signal_cleanup);
/* the following are not valid on Windows */
#ifndef WIN32
pqsignal(SIGALRM, process_alarm);
#endif
#ifdef SIGHUP
/* Not defined on win32 */
pqsignal(SIGHUP, signal_cleanup);
#endif

8
src/test/regress/pg_regress.c
View File

@@ -518,11 +518,15 @@ make_temp_sockdir(void)
* Remove the directory before dying to the usual signals. Omit SIGQUIT,
* preserving it as a quick, untidy exit.
*/
pqsignal(SIGHUP, signal_remove_temp);
pqsignal(SIGINT, signal_remove_temp);
pqsignal(SIGPIPE, signal_remove_temp);
pqsignal(SIGTERM, signal_remove_temp);
/* the following are not valid on Windows */
#ifndef WIN32
pqsignal(SIGHUP, signal_remove_temp);
pqsignal(SIGPIPE, signal_remove_temp);
#endif
return temp_sockdir;
}