Move pqsignal() to libpgport.

We had two copies of this function in the backend and libpq, which was
already pretty bogus, but it turns out that we need it in some other
programs that don't use libpq (such as pg_test_fsync).  So put it where
it probably should have been all along.  The signal-mask-initialization
support in src/backend/libpq/pqsignal.c stays where it is, though, since
we only need that in the backend.

src/interfaces/libpq/Makefile

@@ -32,7 +32,7 @@ LIBS := $(LIBS:-lpgport=)
 # We can't use Makefile variables here because the MSVC build system scrapes
 # OBJS from this file.
 OBJS=	fe-auth.o fe-connect.o fe-exec.o fe-misc.o fe-print.o fe-lobj.o \
-	fe-protocol2.o fe-protocol3.o pqexpbuffer.o pqsignal.o fe-secure.o \
+	fe-protocol2.o fe-protocol3.o pqexpbuffer.o fe-secure.o \
 	libpq-events.o
 # libpgport C files we always use
 OBJS += chklocale.o inet_net_ntop.o noblock.o pgstrcasecmp.o thread.o

src/interfaces/libpq/bcc32.mak

@@ -95,7 +95,6 @@ CLEAN :
 	-@erase "$(INTDIR)\fe-secure.obj"
 	-@erase "$(INTDIR)\libpq-events.obj"
 	-@erase "$(INTDIR)\pqexpbuffer.obj"
-	-@erase "$(INTDIR)\pqsignal.obj"
 	-@erase "$(INTDIR)\win32.obj"
 	-@erase "$(INTDIR)\wchar.obj"
 	-@erase "$(INTDIR)\encnames.obj"
@@ -140,7 +139,6 @@ LIB32_OBJS= \
 	"$(INTDIR)\fe-secure.obj" \
 	"$(INTDIR)\libpq-events.obj" \
 	"$(INTDIR)\pqexpbuffer.obj" \
-	"$(INTDIR)\pqsignal.obj" \
 	"$(INTDIR)\wchar.obj" \
 	"$(INTDIR)\encnames.obj" \
 	"$(INTDIR)\snprintf.obj" \

src/interfaces/libpq/fe-misc.c

@@ -55,7 +55,6 @@
 
 #include "libpq-fe.h"
 #include "libpq-int.h"
-#include "pqsignal.h"
 #include "mb/pg_wchar.h"
 #include "pg_config_paths.h"
 

src/interfaces/libpq/fe-print.c

@@ -35,7 +35,6 @@
 
 #include "libpq-fe.h"
 #include "libpq-int.h"
-#include "pqsignal.h"
 
 
 static void do_field(const PQprintOpt *po, const PGresult *res,

src/interfaces/libpq/fe-secure.c

@@ -30,7 +30,6 @@
 
 #include "libpq-fe.h"
 #include "fe-auth.h"
-#include "pqsignal.h"
 #include "libpq-int.h"
 
 #ifdef WIN32

src/interfaces/libpq/pqsignal.c

@@ -1,49 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * pqsignal.c
- *	  reliable BSD-style signal(2) routine stolen from RWW who stole it
- *	  from Stevens...
- *
- * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  src/interfaces/libpq/pqsignal.c
- *
- * NOTES
- *		This shouldn't be in libpq, but the monitor and some other
- *		things need it...
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres_fe.h"
-
-#include <signal.h>
-
-#include "pqsignal.h"
-
-
-pqsigfunc
-pqsignal(int signo, pqsigfunc func)
-{
-#if !defined(HAVE_POSIX_SIGNALS)
-	return signal(signo, func);
-#else
-	struct sigaction act,
-				oact;
-
-	act.sa_handler = func;
-	sigemptyset(&act.sa_mask);
-	act.sa_flags = 0;
-	if (signo != SIGALRM)
-		act.sa_flags |= SA_RESTART;
-#ifdef SA_NOCLDSTOP
-	if (signo == SIGCHLD)
-		act.sa_flags |= SA_NOCLDSTOP;
-#endif
-	if (sigaction(signo, &act, &oact) < 0)
-		return SIG_ERR;
-	return oact.sa_handler;
-#endif   /* !HAVE_POSIX_SIGNALS */
-}

src/interfaces/libpq/pqsignal.h

@@ -1,25 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * pqsignal.h
- *	  prototypes for the reliable BSD-style signal(2) routine.
- *
- *
- * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * src/interfaces/libpq/pqsignal.h
- *
- * NOTES
- *	  This shouldn't be in libpq, but the monitor and some other
- *	  things need it...
- *
- *-------------------------------------------------------------------------
- */
-#ifndef PQSIGNAL_H
-#define PQSIGNAL_H
-
-typedef void (*pqsigfunc) (int);
-
-extern pqsigfunc pqsignal(int signo, pqsigfunc func);
-
-#endif   /* PQSIGNAL_H */

src/interfaces/libpq/win32.mak

@@ -102,7 +102,6 @@ CLEAN :
 	-@erase "$(INTDIR)\fe-secure.obj"
 	-@erase "$(INTDIR)\libpq-events.obj"
 	-@erase "$(INTDIR)\pqexpbuffer.obj"
-	-@erase "$(INTDIR)\pqsignal.obj"
 	-@erase "$(INTDIR)\win32.obj"
 	-@erase "$(INTDIR)\wchar.obj"
 	-@erase "$(INTDIR)\encnames.obj"
@@ -150,7 +149,6 @@ LIB32_OBJS= \
 	"$(INTDIR)\fe-secure.obj" \
 	"$(INTDIR)\libpq-events.obj" \
 	"$(INTDIR)\pqexpbuffer.obj" \
-	"$(INTDIR)\pqsignal.obj" \
 	"$(INTDIR)\wchar.obj" \
 	"$(INTDIR)\encnames.obj" \
 	"$(INTDIR)\snprintf.obj" \