test-execute: add a test for systemcall filter (#10273)

This adds a test for issue #9939 which is fixed by
a5404992cc (#9942).

src/test/test-execute.c

@@ -359,6 +359,7 @@ static void test_exec_systemcallfilter(Manager *m) {
 
         test(m, "exec-systemcallfilter-with-errno-name.service", errno_from_name("EILSEQ"), CLD_EXITED);
         test(m, "exec-systemcallfilter-with-errno-number.service", 255, CLD_EXITED);
+        test(m, "exec-systemcallfilter-with-errno-multi.service", errno_from_name("EILSEQ"), CLD_EXITED);
 #endif
 }
 

test/meson.build

@@ -134,6 +134,7 @@ test_data_files = '''
         test-execute/exec-systemcallfilter-system-user-nfsnobody.service
         test-execute/exec-systemcallfilter-system-user-nobody.service
         test-execute/exec-systemcallfilter-system-user.service
+        test-execute/exec-systemcallfilter-with-errno-multi.service
         test-execute/exec-systemcallfilter-with-errno-name.service
         test-execute/exec-systemcallfilter-with-errno-number.service
         test-execute/exec-temporaryfilesystem-options.service

test/test-execute/exec-systemcallfilter-with-errno-multi.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Test for SystemCallFilter updating errno
+# test for issue #9939 which is fixed by a5404992cc7724ebf7572a0aa89d9fdb26ce0b62 (#9942)
+
+[Service]
+ExecStart=/usr/bin/python3 -c 'import os\ntry: os.uname()\nexcept Exception as e: exit(e.errno)'
+Type=oneshot
+SystemCallFilter=~uname:ENOENT uname:EILSEQ
+SystemCallErrorNumber=EACCES