tests: check decoding of tgkill syscall

* tests/tgkill.c: New file.
* tests/gen_tests.in (tgkill): New entry.
* tests/pure_executables.list: Add tgkill.
* tests/.gitignore: Likewise.

4 files changed, 72 insertions, 0 deletions

diff --git a/tests/.gitignore b/tests/.gitignore
index e5d059a78..0031d04d7 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -729,6 +729,7 @@ sysinfo
 syslog
 syslog-success
 tee
+tgkill
 threads-execve
 threads-execve--quiet-thread-execve
 threads-execve-q
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 2879d6bfe..6f8e1420e 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -663,6 +663,7 @@ sync_file_range2
 sysinfo	-a14
 syslog	-a35
 tee
+tgkill	-a15 --signal='!cont'
 threads-execve--quiet-thread-execve +threads-execve.test -s40 --quiet=personality,thread-execve
 threads-execve-q +threads-execve.test -q
 threads-execve-qq +threads-execve.test -qq
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index d709ac62f..01619fcf0 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -590,6 +590,7 @@ sync_file_range2
 sysinfo
 syslog
 tee
+tgkill
 time
 timer_create
 timer_xettime
diff --git a/tests/tgkill.c b/tests/tgkill.c
new file mode 100644
index 000000000..901be3764
--- /dev/null
+++ b/tests/tgkill.c
@@ -0,0 +1,69 @@
+/*
+ * Check decoding of tgkill syscall.
+ *
+ * Copyright (c) 2020 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "tests.h"
+#include "scno.h"
+
+#ifdef __NR_tgkill
+
+# include <signal.h>
+# include <stdio.h>
+# include <unistd.h>
+
+static const char *errstr;
+
+static long
+k_tgkill(const unsigned int tgid,
+	 const unsigned int tid,
+	 const unsigned int sig)
+{
+        const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
+        const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
+        const kernel_ulong_t arg1 = fill | tgid;
+        const kernel_ulong_t arg2 = fill | tid;
+        const kernel_ulong_t arg3 = fill | sig;
+        const long rc = syscall(__NR_tgkill, arg1, arg2, arg3, bad, bad, bad);
+        errstr = sprintrc(rc);
+        return rc;
+}
+
+int
+main(void)
+{
+	const int pid = getpid();
+	const int bad_pid = -1;
+	const int bad_sig = 0xface;
+
+	k_tgkill(pid, pid, 0);
+	printf("tgkill(%d, %d, 0) = %s\n", pid, pid, errstr);
+
+	k_tgkill(pid, bad_pid, 0);
+	printf("tgkill(%d, %d, 0) = %s\n", pid, bad_pid, errstr);
+
+	k_tgkill(bad_pid, pid, 0);
+	printf("tgkill(%d, %d, 0) = %s\n", bad_pid, pid, errstr);
+
+	k_tgkill(pid, pid, SIGCONT);
+	printf("tgkill(%d, %d, SIGCONT) = %s\n", pid, pid, errstr);
+
+	k_tgkill(pid, pid, bad_sig);
+	printf("tgkill(%d, %d, %d) = %s\n", pid, pid, bad_sig, errstr);
+
+	k_tgkill(pid, pid, -bad_sig);
+	printf("tgkill(%d, %d, %d) = %s\n", pid, pid, -bad_sig, errstr);
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_tgkill")
+
+#endif