tests: add signal receiver program

Target to kill with a check that will be written later.

CC: Bernhard Voelker <mail@bernhard-voelker.de>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>

tests/commands.sh

@@ -21,6 +21,7 @@ TS_HELPER_MD5="$top_builddir/test_md5"
 TS_HELPER_MORE=${TS_HELPER_MORE-"$top_builddir/test_more"}
 TS_HELPER_PARTITIONS="$top_builddir/sample-partitions"
 TS_HELPER_PATHS="$top_builddir/test_pathnames"
+TS_HELPER_SIGRECEIVE="$top_builddir/test_sigreceive"
 TS_HELPER_STRUTILS="$top_builddir/test_strutils"
 TS_HELPER_SYSINFO="$top_builddir/test_sysinfo"
 

tests/helpers/Makemodule.am

@@ -10,3 +10,7 @@ test_pathnames_SOURCES = tests/helpers/test_pathnames.c
 
 check_PROGRAMS += test_sysinfo
 test_sysinfo_SOURCES = tests/helpers/test_sysinfo.c
+
+check_PROGRAMS += test_sigreceive
+test_sigreceive_SOURCES = tests/helpers/test_sigreceive.c
+test_sigreceive_LDADD = $(LDADD) libcommon.la

tests/helpers/test_sigreceive.c

@@ -0,0 +1,175 @@
+/*
+ * test_sigreceive - wait for signal and exit with value of it
+ *
+ * Written by Sami Kerola <kerolasa@iki.fi>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <err.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/select.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "strutils.h"
+
+#define TEST_SIGRECEIVE_FAILURE 0
+
+static void __attribute__((__noreturn__)) usage(FILE *out)
+{
+	fputs("Usage: test_sigreceive [-s|--setuid <login|uid>]\n", out);
+	exit(TEST_SIGRECEIVE_FAILURE);
+}
+
+static __attribute__((__noreturn__))
+void exiter(int sig)
+{
+	_exit(sig);
+}
+
+int main(int argc, char **argv)
+{
+	struct sigaction sigact;
+	fd_set rfds;
+	struct timeval timeout;
+	char *user = NULL;
+	int c;
+
+	static const struct option longopts[] = {
+		{"setuid", required_argument, NULL, 's'},
+		{NULL, 0, NULL, 0}
+	};
+
+	while ((c = getopt_long(argc, argv, "s:h", longopts, NULL)) != -1)
+		switch (c) {
+		case 's':
+			user = optarg;
+			break;
+		case 'h':
+			usage(stdout);
+		default:
+			usage(stderr);
+		}
+
+	if (user) {
+		struct passwd *pw;
+		uid_t uid;
+
+		pw = getpwnam(user);
+		if (pw)
+			uid = pw->pw_uid;
+		else
+			uid = strtou32_or_err(user, "failed to parse uid");
+		if (setuid(uid) < 0)
+			err(TEST_SIGRECEIVE_FAILURE, "setuid failed");
+	}
+
+	sigemptyset(&sigact.sa_mask);
+	sigact.sa_flags = 0;
+	sigact.sa_handler = exiter;
+	timeout.tv_sec = 5;
+	timeout.tv_usec = 0;
+
+	sigaction(SIGINT, &sigact, NULL);
+	sigaction(SIGQUIT, &sigact, NULL);
+	sigaction(SIGILL, &sigact, NULL);
+#ifdef SIGTRAP
+	sigaction(SIGTRAP, &sigact, NULL);
+#endif
+	sigaction(SIGABRT, &sigact, NULL);
+#ifdef SIGIOT
+	sigaction(SIGIOT, &sigact, NULL);
+#endif
+#ifdef SIGEMT
+	sigaction(SIGEMT, &sigact, NULL);
+#endif
+#ifdef SIGBUS
+	sigaction(SIGBUS, &sigact, NULL);
+#endif
+	sigaction(SIGFPE, &sigact, NULL);
+	sigaction(SIGUSR1, &sigact, NULL);
+	sigaction(SIGSEGV, &sigact, NULL);
+	sigaction(SIGUSR2, &sigact, NULL);
+	sigaction(SIGPIPE, &sigact, NULL);
+	sigaction(SIGALRM, &sigact, NULL);
+	sigaction(SIGTERM, &sigact, NULL);
+#ifdef SIGSTKFLT
+	sigaction(SIGSTKFLT, &sigact, NULL);
+#endif
+	sigaction(SIGCHLD, &sigact, NULL);
+#ifdef SIGCLD
+	sigaction(SIGCLD, &sigact, NULL);
+#endif
+	sigaction(SIGCONT, &sigact, NULL);
+	sigaction(SIGTSTP, &sigact, NULL);
+	sigaction(SIGTTIN, &sigact, NULL);
+	sigaction(SIGTTOU, &sigact, NULL);
+#ifdef SIGURG
+	sigaction(SIGURG, &sigact, NULL);
+#endif
+#ifdef SIGXCPU
+	sigaction(SIGXCPU, &sigact, NULL);
+#endif
+#ifdef SIGXFSZ
+	sigaction(SIGXFSZ, &sigact, NULL);
+#endif
+#ifdef SIGVTALRM
+	sigaction(SIGVTALRM, &sigact, NULL);
+#endif
+#ifdef SIGPROF
+	sigaction(SIGPROF, &sigact, NULL);
+#endif
+#ifdef SIGWINCH
+	sigaction(SIGWINCH, &sigact, NULL);
+#endif
+#ifdef SIGIO
+	sigaction(SIGIO, &sigact, NULL);
+#endif
+#ifdef SIGPOLL
+	sigaction(SIGPOLL, &sigact, NULL);
+#endif
+#ifdef SIGINFO
+	sigaction(SIGINFO, &sigact, NULL);
+#endif
+#ifdef SIGLOST
+	sigaction(SIGLOST, &sigact, NULL);
+#endif
+#ifdef SIGPWR
+	sigaction(SIGPWR, &sigact, NULL);
+#endif
+#ifdef SIGUNUSED
+	sigaction(SIGUNUSED, &sigact, NULL);
+#endif
+#ifdef SIGSYS
+	sigaction(SIGSYS, &sigact, NULL);
+#endif
+#ifdef SIGRTMIN
+	sigaction(SIGRTMIN, &sigact, NULL);
+	sigaction(SIGRTMAX, &sigact, NULL);
+#endif
+	/* Keep SIGHUP last, the bit it flips tells to check script the
+	 * helper is ready to be killed.  */
+	sigaction(SIGHUP, &sigact, NULL);
+
+	FD_ZERO(&rfds);
+	FD_SET(STDIN_FILENO, &rfds);
+	select(0, &rfds, NULL, NULL, &timeout);
+
+	exiter(TEST_SIGRECEIVE_FAILURE);
+}