proc: add selftest for last field of /proc/loadavg

Test fork counter formerly known as ->last_pid, the only part of
/proc/loadavg which can be tested.

Testing in init pid namespace is not reliable because of background
activity.

Link: http://lkml.kernel.org/r/20180311152241.GA26247@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>

diff --git a/tools/testing/selftests/proc/.gitignore b/tools/testing/selftests/proc/.gitignore
index e3ceb19..78c40f5 100644 (file)
--- a/tools/testing/selftests/proc/.gitignore
+++ b/tools/testing/selftests/proc/.gitignore
@@ -1,3 +1,4 @@
+/proc-loadavg-001
 /proc-self-map-files-001
 /proc-self-map-files-002
 /proc-self-syscall

diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
index 1a0ce32..d7f7058 100644 (file)
--- 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-loadavg-001
 TEST_GEN_PROGS += proc-self-map-files-001
 TEST_GEN_PROGS += proc-self-map-files-002
 TEST_GEN_PROGS += proc-self-syscall

diff --git a/tools/testing/selftests/proc/proc-loadavg-001.c b/tools/testing/selftests/proc/proc-loadavg-001.c
new file mode 100644 (file)
index 0000000..e38ad6d
--- /dev/null
+++ b/tools/testing/selftests/proc/proc-loadavg-001.c
@@ -0,0 +1,83 @@
+/*
+ * 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/loadavg correctly reports last pid in pid namespace. */
+#define _GNU_SOURCE
+#include <errno.h>
+#include <sched.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+int main(void)
+{
+       pid_t pid;
+       int wstatus;
+
+       if (unshare(CLONE_NEWPID) == -1) {
+               if (errno == ENOSYS || errno == EPERM)
+                       return 2;
+               return 1;
+       }
+
+       pid = fork();
+       if (pid == -1)
+               return 1;
+       if (pid == 0) {
+               char buf[128], *p;
+               int fd;
+               ssize_t rv;
+
+               fd = open("/proc/loadavg" , O_RDONLY);
+               if (fd == -1)
+                       return 1;
+               rv = read(fd, buf, sizeof(buf));
+               if (rv < 3)
+                       return 1;
+               p = buf + rv;
+
+               /* pid 1 */
+               if (!(p[-3] == ' ' && p[-2] == '1' && p[-1] == '\n'))
+                       return 1;
+
+               pid = fork();
+               if (pid == -1)
+                       return 1;
+               if (pid == 0)
+                       return 0;
+               if (waitpid(pid, NULL, 0) == -1)
+                       return 1;
+
+               lseek(fd, 0, SEEK_SET);
+               rv = read(fd, buf, sizeof(buf));
+               if (rv < 3)
+                       return 1;
+               p = buf + rv;
+
+               /* pid 2 */
+               if (!(p[-3] == ' ' && p[-2] == '2' && p[-1] == '\n'))
+                       return 1;
+
+               return 0;
+       }
+
+       if (waitpid(pid, &wstatus, 0) == -1)
+               return 1;
+       if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0)
+               return 0;
+       return 1;
+}