extract soft interrupt handlers

Delays handler setup until after config is set to a valid
value to avoid a segmentation fault.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

src/pacman/pacman.c

@@ -1092,7 +1092,6 @@ int main(int argc, char *argv[])
 	uid_t myuid = getuid();
 
 	install_segv_handler();
-	install_signal_handlers();
 
 	/* i18n init */
 #if defined(ENABLE_NLS)
@@ -1108,6 +1107,8 @@ int main(int argc, char *argv[])
 		cleanup(1);
 	}
 
+	install_soft_interrupt_handler();
+
 	if(!isatty(fileno(stdout))) {
 		/* disable progressbar if the output is redirected */
 		config->noprogressbar = 1;

src/pacman/sighandler.c

@@ -42,7 +42,7 @@ static ssize_t xwrite(int fd, const void *buf, size_t count)
  * in a consistent state.
  * @param signum the thrown signal
  */
-static void handler(int signum)
+static void soft_interrupt_handler(int signum)
 {
 	if(signum == SIGINT) {
 		const char msg[] = "\nInterrupt signal received\n";
@@ -55,13 +55,25 @@ static void handler(int signum)
 		/* a transaction is being interrupted, don't exit pacman yet. */
 		return;
 	}
-	/* SIGINT/SIGHUP: no committing transaction, release it now and then exit pacman */
 	alpm_unlock(config->handle);
 	/* output a newline to be sure we clear any line we may be on */
 	xwrite(STDOUT_FILENO, "\n", 1);
 	_Exit(128 + signum);
 }
 
+void install_soft_interrupt_handler(void)
+{
+	struct sigaction new_action;
+	new_action.sa_handler = soft_interrupt_handler;
+	new_action.sa_flags = SA_RESTART;
+	sigemptyset(&new_action.sa_mask);
+	sigaddset(&new_action.sa_mask, SIGINT);
+	sigaddset(&new_action.sa_mask, SIGHUP);
+
+	sigaction(SIGINT, &new_action, NULL);
+	sigaction(SIGHUP, &new_action, NULL);
+}
+
 static void segv_handler(int signum)
 {
 	const char msg[] = "\nerror: segmentation fault\n"
@@ -94,22 +106,4 @@ void install_winch_handler(void)
 	sigaction(SIGWINCH, &new_action, NULL);
 }
 
-void install_signal_handlers(void)
-{
-	struct sigaction new_action;
-	const int signals[] = { SIGHUP, SIGINT };
-	size_t i;
-
-	/* Set signal handlers */
-	/* Set up the structure to specify the new action. */
-	new_action.sa_handler = handler;
-	sigemptyset(&new_action.sa_mask);
-	new_action.sa_flags = SA_RESTART;
-
-	/* assign our handler to any signals we care about */
-	for(i = 0; i < ARRAYSIZE(signals); i++) {
-		sigaction(signals[i], &new_action, NULL);
-	}
-}
-
 /* vim: set noet: */

src/pacman/sighandler.h

@@ -22,7 +22,7 @@
 
 void install_segv_handler(void);
 void install_winch_handler(void);
-void install_signal_handlers(void);
+void install_soft_interrupt_handler(void);
 
 #endif /* _PM_SIGHANDLER_H */