tests: add swap.test

* tests/swap.c: New file.
* tests/swap.test: New test.
* tests/.gitignore: Add swap.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add swap.test.

tests/.gitignore

@@ -137,6 +137,7 @@ stack-fcall
 stat
 stat64
 statfs
+swap
 sync_file_range
 sync_file_range2
 sysinfo

tests/Makefile.am

@@ -186,6 +186,7 @@ check_PROGRAMS = \
 	stat \
 	stat64 \
 	statfs \
+	swap \
 	sync_file_range \
 	sync_file_range2 \
 	sysinfo \
@@ -374,6 +375,7 @@ DECODER_TESTS = \
 	stat64.test \
 	statfs.test \
 	sun_path.test \
+	swap.test \
 	sync_file_range.test \
 	sync_file_range2.test \
 	sysinfo.test \

tests/swap.c

@@ -0,0 +1,42 @@
+#include "tests.h"
+#include <sys/syscall.h>
+
+#if defined __NR_swapon && defined __NR_swapoff
+
+# include <errno.h>
+# include <stdio.h>
+# include <sys/swap.h>
+# include <unistd.h>
+
+static const char *
+error_msg(int error_num)
+{
+	switch (error_num) {
+		case ENOSYS: return "ENOSYS";
+		case EPERM: return "EPERM";
+		default: return "ENOENT";
+	}
+}
+
+int
+main(void)
+{
+	static const char sample[] = "swap.sample";
+
+	int rc = syscall(__NR_swapon, sample, 0);
+	printf("swapon(\"%s\", 0) = %d %s (%m)\n",
+	       sample, rc, error_msg(errno));
+
+	rc = syscall(__NR_swapoff, sample);
+	printf("swapoff(\"%s\") = %d %s (%m)\n",
+	       sample, rc, error_msg(errno));
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_swapon && __NR_swapoff")
+
+#endif

tests/swap.test

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check swapon and swapoff syscalls decoding.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a23 -e trace=swapon,swapoff