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Fix pg_dump's sigTermHandler() to use _exit() not exit().

sigTermHandler() tried to be careful to invoke only operations thatare safe to do in a signal handler. But for some reason we forgotthat exit(3) is not among those, because it calls atexit handlersthat might do various random things. (pg_dump itself installs noatexit handlers, but e.g. OpenSSL does.) That led to crashes orlockups when attempting to terminate a parallel dump or restorevia a signal.Fix by calling _exit() instead.Per bug #16199 from Raúl Marín. Back-patch to all supported branches.Discussion:https://postgr.es/m/16199-cb2f121146a96f9b@postgresql.org

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src/bin/pg_dump
- parallel.c

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`‎src/bin/pg_dump/parallel.c`

Lines changed: 5 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -611,8 +611,11 @@ sigTermHandler(SIGNAL_ARGS)`
`611`	`611`	`write_stderr("terminated by user\n");`
`612`	`612`	`}`
`613`	`613`
`614`		`-/* And die. */`
`615`		`-exit(1);`
	`614`	`+/*`
	`615`	`+ * And die, using _exit() not exit() because the latter will invoke atexit`
	`616`	`+ * handlers that can fail if we interrupted related code.`
	`617`	`+ */`
	`618`	`+_exit(1);`
`616`	`619`	`}`
`617`	`620`
`618`	`621`	`/*`

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Commit4ea5cf4

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`‎src/bin/pg_dump/parallel.c`

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