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Subject[PATCH 2/2] proc: test /proc/self/syscall
Read from /proc/self/syscall should yield read system call and correct
args in the output as current is reading /proc/self/syscall.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

tools/testing/selftests/proc/.gitignore | 3 +
tools/testing/selftests/proc/Makefile | 1
tools/testing/selftests/proc/proc-self-syscall.c | 45 +++++++++++++++++++++++
3 files changed, 48 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/proc/.gitignore
+++ b/tools/testing/selftests/proc/.gitignore
@@ -1 +1,2 @@
-/proc-self-wchan
+/proc-self-mem
+/proc-self-syscall
--- a/tools/testing/selftests/proc/Makefile
+++ b/tools/testing/selftests/proc/Makefile
@@ -1,6 +1,7 @@
CFLAGS += -Wall -O2

TEST_GEN_PROGS :=
+TEST_GEN_PROGS += proc-self-syscall
TEST_GEN_PROGS += proc-self-wchan

include ../lib.mk
new file mode 100644
--- /dev/null
+++ b/tools/testing/selftests/proc/proc-self-syscall.c
@@ -0,0 +1,45 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+static inline ssize_t sys_read(int fd, void *buf, size_t len)
+{
+ return syscall(SYS_read, fd, buf, len);
+}
+
+int main(void)
+{
+ char buf1[64];
+ char buf2[64];
+ int fd;
+ ssize_t rv;
+
+ fd = open("/proc/self/syscall", O_RDONLY);
+ if (fd == -1) {
+ if (errno == ENOENT)
+ return 2;
+ return 1;
+ }
+
+ /* Do direct system call as libc can wrap anything. */
+ snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
+ (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
+
+ memset(buf2, 0, sizeof(buf2));
+ rv = sys_read(fd, buf2, sizeof(buf2));
+ if (rv < 0)
+ return 1;
+ if (rv < strlen(buf1))
+ return 1;
+ if (strncmp(buf1, buf2, strlen(buf1)) != 0)
+ return 1;
+
+ return 0;
+}
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