From d8953ce923ec3bee1b0e4459e737e315472ec808 Mon Sep 17 00:00:00 2001
From: Stafford Horne <shorne@gmail.com>
Date: Thu, 14 Dec 2017 15:21:00 +0900
Subject: tst-syscall*: Add tests for syscall() with varargs

Add tests in preparation for genericizing some of the architecture
syscall() implementations.

This was noticed when testing OR1K and found it had a broken syscall
implementation.

These tests try to cover the libc syscall() lqyer which has the purpose
of passing the syscall number and arguments to the kernel.  The actual
kernel syscalls chosen have been selected for ease of testing.

Signed-off-by: Stafford Horne <shorne@gmail.com>
---
 test/misc/tst-syscall0.c | 15 ++++++++++++
 test/misc/tst-syscall1.c | 18 ++++++++++++++
 test/misc/tst-syscall6.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 test/misc/tst-syscall0.c
 create mode 100644 test/misc/tst-syscall1.c
 create mode 100644 test/misc/tst-syscall6.c

diff --git a/test/misc/tst-syscall0.c b/test/misc/tst-syscall0.c
new file mode 100644
index 0000000..ebfca95
--- /dev/null
+++ b/test/misc/tst-syscall0.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+int main() {
+	int pid;
+
+	pid = syscall(SYS_getpid);
+   	if (pid > 0) {
+		printf("syscall(SYS_getpid) says %d\n", pid);
+     		return 0;
+	}
+
+	return 1;
+}
diff --git a/test/misc/tst-syscall1.c b/test/misc/tst-syscall1.c
new file mode 100644
index 0000000..e3b990e
--- /dev/null
+++ b/test/misc/tst-syscall1.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/utsname.h>
+
+int main() {
+	int ret;
+	struct utsname name;
+
+	ret = syscall(SYS_uname, &name);
+   	if (ret == 0) {
+		printf("syscall(SYS_uname) says %s-%s\n", name.sysname,
+			name.release);
+     		return 0;
+	}
+
+	return 1;
+}
diff --git a/test/misc/tst-syscall6.c b/test/misc/tst-syscall6.c
new file mode 100644
index 0000000..dad67d1
--- /dev/null
+++ b/test/misc/tst-syscall6.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/uio.h>
+#include <sys/types.h>
+#include <linux/fs.h> /* for RWF_HIPRI */
+
+int main()
+{
+	char tmp[] = "/tmp/tst-preadv2-XXXXXX";
+	int fd;
+	struct iovec iov[2];
+	char *str0 = "hello ";
+	char *str1 = "world\n";
+	char input[16];
+	int nio;
+
+	fd = mkstemp (tmp);
+	if (fd == -1) {
+		puts ("mkstemp failed");
+		return 1;
+	}
+
+	iov[0].iov_base = str0;
+	iov[0].iov_len = strlen(str0);
+	iov[1].iov_base = str1;
+	iov[1].iov_len = strlen(str1) + 1; /* null terminator */
+
+	nio = syscall(SYS_pwritev2, fd, iov, 2, 0, 0, RWF_DSYNC);
+
+	if (nio <= 0) {
+		puts ("failed to write to fd");
+		return 1;
+	}
+
+	/* Read in the second string into the first buffer */
+	iov[0].iov_base = input;
+	iov[0].iov_len = strlen(str1) + 1; /* null terminator */
+	nio = syscall(SYS_preadv2, fd, iov, 1, strlen(str0), 0, RWF_HIPRI);
+	if (nio <= 0) {
+		printf ("failed to read fd %d\n", nio);
+		return 1;
+	}
+
+	if (strncmp(iov[0].iov_base, iov[1].iov_base, strlen(str1)) == 0)
+		printf ("syscall(SYS_preadv2) read %s", (char *) iov[0].iov_base);
+
+	if (close(fd) != 0) {
+		puts ("failed to close read fd");
+		return 1;
+	}
+
+	if (unlink(tmp) != 0) {
+		puts ("failed to unlink file");
+		return 1;
+	}
+
+	return 0;
+}
-- 
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