aboutsummaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/proc
diff options
context:
space:
mode:
authorAlexey Dobriyan <adobriyan@gmail.com>2018-08-21 21:54:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-22 10:52:45 -0700
commit2cd36fb329487e9525db3ccdbac1e92053b646fa (patch)
treed1c65365896e5c0448352e00a4ef77c9e872bc57 /tools/testing/selftests/proc
parentproc: test /proc/self symlink (diff)
downloadlinux-dev-2cd36fb329487e9525db3ccdbac1e92053b646fa.tar.xz
linux-dev-2cd36fb329487e9525db3ccdbac1e92053b646fa.zip
proc: test /proc/thread-self symlink
Same story: I have WIP patch to make it faster, so better have a test as well. Link: http://lkml.kernel.org/r/20180627195209.GC18113@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/proc')
-rw-r--r--tools/testing/selftests/proc/.gitignore1
-rw-r--r--tools/testing/selftests/proc/Makefile1
-rw-r--r--tools/testing/selftests/proc/proc.h5
-rw-r--r--tools/testing/selftests/proc/thread-self.c64
4 files changed, 71 insertions, 0 deletions
diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore
index ee33d6c3137f..82121a81681f 100644
--- a/tools/testing/selftests/proc/.gitignore
+++ b/tools/testing/selftests/proc/.gitignore
@@ -10,3 +10,4 @@
/proc-uptime-002
/read
/self
+/thread-self
diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
index 344bca8e4b28..1c12c34cf85d 100644
--- a/tools/testing/selftests/proc/Makefile
+++ b/tools/testing/selftests/proc/Makefile
@@ -14,5 +14,6 @@ TEST_GEN_PROGS += proc-uptime-001
TEST_GEN_PROGS += proc-uptime-002
TEST_GEN_PROGS += read
TEST_GEN_PROGS += self
+TEST_GEN_PROGS += thread-self
include ../lib.mk
diff --git a/tools/testing/selftests/proc/proc.h b/tools/testing/selftests/proc/proc.h
index 31ca4b0c007f..b7d57ea40237 100644
--- a/tools/testing/selftests/proc/proc.h
+++ b/tools/testing/selftests/proc/proc.h
@@ -14,6 +14,11 @@ static inline pid_t sys_getpid(void)
return syscall(SYS_getpid);
}
+static inline pid_t sys_gettid(void)
+{
+ return syscall(SYS_gettid);
+}
+
static inline bool streq(const char *s1, const char *s2)
{
return strcmp(s1, s2) == 0;
diff --git a/tools/testing/selftests/proc/thread-self.c b/tools/testing/selftests/proc/thread-self.c
new file mode 100644
index 000000000000..4b23b39b7ae0
--- /dev/null
+++ b/tools/testing/selftests/proc/thread-self.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+// Test that /proc/thread-self gives correct TGID/PID.
+#undef NDEBUG
+#include <assert.h>
+#include <sched.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+
+#include "proc.h"
+
+int f(void *arg)
+{
+ char buf1[64], buf2[64];
+ pid_t pid, tid;
+ ssize_t rv;
+
+ pid = sys_getpid();
+ tid = sys_gettid();
+ snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid);
+
+ rv = readlink("/proc/thread-self", buf2, sizeof(buf2));
+ assert(rv == strlen(buf1));
+ buf2[rv] = '\0';
+ assert(streq(buf1, buf2));
+
+ if (arg)
+ exit(0);
+ return 0;
+}
+
+int main(void)
+{
+ const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
+ pid_t pid;
+ void *stack;
+
+ /* main thread */
+ f((void *)0);
+
+ stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+ assert(stack != MAP_FAILED);
+ /* side thread */
+ pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1);
+ assert(pid > 0);
+ pause();
+
+ return 0;
+}