Kill POSIX_SIGNALS define and old signal support now that we emulate POSIX ones

Also be sure to correctly initialize struct sigaction.

config.h.in

@@ -125,12 +125,6 @@
 /* Define if you want to use execv() instead of execvp().  */
 #undef USE_EXECV
 
-/* Define if you have POSIX signals.  */
-#undef HAVE_SIGACTION
-#ifdef HAVE_SIGACTION
-#  define POSIX_SIGNALS
-#endif /* HAVE_SIGACTION */
-
 /* Define if you have tzset(3).  */
 #undef HAVE_TZSET
 

configure.in

@@ -1550,7 +1550,7 @@ esac
 dnl
 dnl Function checks
 dnl
-AC_CHECK_FUNCS(strchr strrchr memchr memcpy memset sysconf sigaction tzset \
+AC_CHECK_FUNCS(strchr strrchr memchr memcpy memset sysconf tzset \
 	       seteuid setegid strftime setrlimit initgroups fstat)
 if test -z "$BROKEN_SETREUID"; then
     AC_CHECK_FUNCS(setreuid)
@@ -1570,7 +1570,7 @@ AC_CHECK_FUNCS(innetgr _innetgr, AC_CHECK_FUNCS(getdomainname) [break])
 AC_CHECK_FUNCS(lsearch, , [AC_CHECK_LIB(compat, lsearch, AC_CHECK_HEADER(search.h, AC_DEFINE(HAVE_LSEARCH) [LIBS="${LIBS} -lcompat"], AC_LIBOBJ(lsearch)), AC_LIBOBJ(lsearch))])
 AC_CHECK_FUNCS(utime, SUDO_FUNC_UTIME_POSIX, AC_LIBOBJ(utime))
 SUDO_FUNC_FNMATCH(AC_DEFINE(HAVE_FNMATCH), AC_LIBOBJ(fnmatch))
-AC_REPLACE_FUNCS(strerror strcasecmp)
+AC_REPLACE_FUNCS(strerror strcasecmp sigaction)
 AC_CHECK_FUNCS(snprintf vsnprintf asprintf vasprintf, , [NEED_SNPRINTF=1])
 dnl
 dnl If NEED_SNPRINTF is set, add snprintf.c to LIBOBJS

logging.c

@@ -432,23 +432,15 @@ send_mail(line)
     FILE *mail;
     char *p;
     int pfd[2], pid, status;
-#ifdef POSIX_SIGNALS
     sigset_t set, oset;
-#else
-    int omask;
-#endif /* POSIX_SIGNALS */
 
     /* Just return if mailer is disabled. */
     if (!def_str(I_MAILERPATH) || !def_str(I_MAILTO))
 	return;
 
-#ifdef POSIX_SIGNALS
     (void) sigemptyset(&set);
     (void) sigaddset(&set, SIGCHLD);
     (void) sigprocmask(SIG_BLOCK, &set, &oset);
-#else
-    omask = sigblock(sigmask(SIGCHLD));
-#endif /* POSIX_SIGNALS */
 
     if (pipe(pfd) == -1) {
 	(void) fprintf(stderr, "%s: cannot open pipe: %s\n",
@@ -534,11 +526,7 @@ send_mail(line)
 #ifdef sudo_waitpid
     (void) sudo_waitpid(pid, &status, WNOHANG);
 #endif
-#ifdef POSIX_SIGNALS
     (void) sigprocmask(SIG_SETMASK, &oset, NULL);
-#else
-    (void) sigsetmask(omask);
-#endif /* POSIX_SIGNALS */
 }
 
 /*
@@ -584,9 +572,6 @@ reapchild(sig)
 #else
     (void) wait(&status);
 #endif
-#ifndef POSIX_SIGNALS
-    (void) signal(SIGCHLD, reapchild);
-#endif /* POSIX_SIGNALS */
     errno = serrno;
 }
 

sudo.c

@@ -146,11 +146,7 @@ main(argc, argv, envp)
     int cmnd_status;
     int sudo_mode;
     int pwflag;
-#ifdef POSIX_SIGNALS
     sigset_t set, oset;
-#else
-    int omask;
-#endif /* POSIX_SIGNALS */
     extern int printmatches;
     extern char **environ;
 
@@ -177,15 +173,11 @@ main(argc, argv, envp)
      * Block signals so the user cannot interrupt us at some point and
      * avoid the logging.
      */
-#ifdef POSIX_SIGNALS
     (void) sigemptyset(&set);
     (void) sigaddset(&set, SIGINT);
     (void) sigaddset(&set, SIGQUIT);
     (void) sigaddset(&set, SIGTSTP);
     (void) sigprocmask(SIG_BLOCK, &set, &oset);
-#else
-    omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTSTP));
-#endif /* POSIX_SIGNALS */
 
     /*
      * Setup signal handlers, turn off core dumps, and close open files.
@@ -344,11 +336,7 @@ main(argc, argv, envp)
 	endpwent();
 
 	/* Reset signal mask before we exec. */
-#ifdef POSIX_SIGNALS
 	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
-#else
-	(void) sigsetmask(omask);
-#endif /* POSIX_SIGNALS */
 
 	/* Override user's umask if configured to do so. */
 	if (def_ival(I_UMASK) != 0777)
@@ -809,9 +797,7 @@ initial_setup()
 #ifdef HAVE_SETRLIMIT
     struct rlimit rl;
 #endif
-#ifdef POSIX_SIGNALS
+    sigaction_t sa;
-    struct sigaction sa;
-#endif
 
 #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
     /*
@@ -841,13 +827,10 @@ initial_setup()
 	(void) close(fd);
 
     /* Catch children as they die... */
-#ifdef POSIX_SIGNALS
+    sigemptyset(&sa.sa_mask);
-    (void) memset((VOID *)&sa, 0, sizeof(sa));
+    sa.sa_flags = SA_RESTART;
     sa.sa_handler = reapchild;
     (void) sigaction(SIGCHLD, &sa, NULL);
-#else
-    (void) signal(SIGCHLD, reapchild);
-#endif /* POSIX_SIGNALS */
 
     /* Set set_perms pointer to the correct function */
 #if defined(_SC_SAVED_IDS) && defined(_SC_VERSION)

visudo.c

@@ -568,28 +568,18 @@ whatnow()
 static void
 setup_signals()
 {
-#ifdef POSIX_SIGNALS
+	sigaction_t sa;
-	struct sigaction action;		/* POSIX signal structure */
-#endif /* POSIX_SIGNALS */
 
 	/*
 	 * Setup signal handlers to cleanup nicely.
 	 */
-#ifdef POSIX_SIGNALS
+	sigemptyset(&sa.sa_mask);
-	(void) memset((VOID *)&action, 0, sizeof(action));
+	sa.sa_flags = SA_RESTART;
-	sigemptyset(&action.sa_mask);
+	sa.sa_handler = Exit;
-	action.sa_flags = 0;
+	(void) sigaction(SIGTERM, &sa, NULL);
-	action.sa_handler = Exit;
+	(void) sigaction(SIGHUP, &sa, NULL);
-	(void) sigaction(SIGTERM, &action, NULL);
+	(void) sigaction(SIGINT, &sa, NULL);
-	(void) sigaction(SIGHUP, &action, NULL);
+	(void) sigaction(SIGQUIT, &sa, NULL);
-	(void) sigaction(SIGINT, &action, NULL);
-	(void) sigaction(SIGQUIT, &action, NULL);
-#else
-	(void) signal(SIGTERM, Exit);
-	(void) signal(SIGHUP, Exit);
-	(void) signal(SIGINT, Exit);
-	(void) signal(SIGQUIT, Exit);
-#endif /* POSIX_SIGNALS */
 }
 
 static int
@@ -599,15 +589,11 @@ run_command(path, argv)
 {
     int status;
     pid_t pid;
-#ifndef POSIX_SIGNALS
-    int omask = sigblock(sigmask(SIGCHLD));
-#else
     sigset_t set, oset;
 
     (void) sigemptyset(&set);
     (void) sigaddset(&set, SIGCHLD);
     (void) sigprocmask(SIG_BLOCK, &set, &oset);
-#endif /* POSIX_SIGNALS */
 
     switch (pid = fork()) {
 	case -1:
@@ -616,11 +602,7 @@ run_command(path, argv)
 	    Exit(-1);
 	    break;	/* NOTREACHED */
 	case 0:
-#ifdef POSIX_SIGNALS
 	    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
-#else
-	    (void) sigsetmask(omask);
-#endif /* POSIX_SIGNALS */
 	    execv(path, argv);
 	    (void) fprintf(stderr,
 		"%s: unable to run %s: %s\n", Argv[0], path, strerror(errno));
@@ -634,11 +616,7 @@ run_command(path, argv)
     pid = wait(&status);
 #endif
 
-#ifdef POSIX_SIGNALS
     (void) sigprocmask(SIG_SETMASK, &oset, NULL);
-#else
-    (void) sigsetmask(omask);
-#endif /* POSIX_SIGNALS */
 
     /* XXX - should use WEXITSTATUS() */
     return(pid == -1 ? -1 : (status >> 8));