From 9cd65655585523adecd65b750e1537cdea84718e Mon Sep 17 00:00:00 2001
From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Tue, 10 Apr 2018 16:31:45 -0700
Subject: [PATCH] proc: test /proc/self/wchan
This patch starts testing /proc. Many more tests to come (I promise).
Read from /proc/self/wchan should always return "0" as current is in
TASK_RUNNING state while reading /proc/self/wchan.
Link: http://lkml.kernel.org/r/20180226212006.GA742@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/proc/.gitignore | 1 +
tools/testing/selftests/proc/Makefile | 6 +++++
tools/testing/selftests/proc/config | 1 +
.../testing/selftests/proc/proc-self-wchan.c | 25 +++++++++++++++++++
5 files changed, 34 insertions(+)
create mode 100644 tools/testing/selftests/proc/.gitignore
create mode 100644 tools/testing/selftests/proc/Makefile
create mode 100644 tools/testing/selftests/proc/config
create mode 100644 tools/testing/selftests/proc/proc-self-wchan.c
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 2fc410bc4f331..32aafa92074c5 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -25,6 +25,7 @@ TARGETS += mqueue
TARGETS += net
TARGETS += nsfs
TARGETS += powerpc
+TARGETS += proc
TARGETS += pstore
TARGETS += ptrace
TARGETS += seccomp
diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore
new file mode 100644
index 0000000000000..4c851db80bd57
--- /dev/null
+++ b/tools/testing/selftests/proc/.gitignore
@@ -0,0 +1 @@
+/proc-self-wchan
diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
new file mode 100644
index 0000000000000..592603a5d6753
--- /dev/null
+++ b/tools/testing/selftests/proc/Makefile
@@ -0,0 +1,6 @@
+CFLAGS += -Wall -O2
+
+TEST_GEN_PROGS :=
+TEST_GEN_PROGS += proc-self-wchan
+
+include ../lib.mk
diff --git a/tools/testing/selftests/proc/config b/tools/testing/selftests/proc/config
new file mode 100644
index 0000000000000..68fbd2b358843
--- /dev/null
+++ b/tools/testing/selftests/proc/config
@@ -0,0 +1 @@
+CONFIG_PROC_FS=y
diff --git a/tools/testing/selftests/proc/proc-self-wchan.c b/tools/testing/selftests/proc/proc-self-wchan.c
new file mode 100644
index 0000000000000..b8d8728a6869a
--- /dev/null
+++ b/tools/testing/selftests/proc/proc-self-wchan.c
@@ -0,0 +1,25 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+int main(void)
+{
+ char buf[64];
+ int fd;
+
+ fd = open("/proc/self/wchan", O_RDONLY);
+ if (fd == -1) {
+ if (errno == ENOENT)
+ return 2;
+ return 1;
+ }
+
+ buf[0] = '\0';
+ if (read(fd, buf, sizeof(buf)) != 1)
+ return 1;
+ if (buf[0] != '0')
+ return 1;
+ return 0;
+}
--
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