Add a regression test for pipefs, sockfs and anon_inodefs

test/src/apps/Makefile

@@ -37,6 +37,7 @@ TEST_APPS := \
 	prctl \
 	process \
 	procfs \
+	pseudofs \
 	pthread \
 	pty \
 	sched \

test/src/apps/pseudofs/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: MPL-2.0
+
+include ../test_common.mk
+
+EXTRA_C_FLAGS :=

test/src/apps/pseudofs/pseudo_inode.c

@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <sys/eventfd.h>
+#include <sys/timerfd.h>
+#include <sys/signalfd.h>
+#include <sys/epoll.h>
+#include <signal.h>
+
+#include "../test.h"
+
+static void fd_path(int fd, char *buf, size_t buflen)
+{
+	CHECK(snprintf(buf, buflen, "/proc/self/fd/%d", fd));
+}
+
+int get_mode(int fd)
+{
+	char path[64];
+	struct stat st;
+	fd_path(fd, path, sizeof(path));
+	CHECK(stat(path, &st));
+	return st.st_mode & 0777;
+}
+
+void set_mode(int fd, int mode)
+{
+	mode &= 0777;
+	char path[64];
+	fd_path(fd, path, sizeof(path));
+	CHECK(chmod(path, mode));
+}
+
+FN_TEST(pipe_ends_share_inode)
+{
+	int pipe1[2], pipe2[2];
+	TEST_SUCC(pipe(pipe1));
+	TEST_SUCC(pipe(pipe2));
+
+	TEST_RES(get_mode(pipe1[0]), _ret == 0600);
+	TEST_RES(get_mode(pipe1[1]), _ret == 0600);
+	TEST_RES(get_mode(pipe2[0]), _ret == 0600);
+	TEST_RES(get_mode(pipe2[1]), _ret == 0600);
+
+	set_mode(pipe1[0], 0000);
+
+	TEST_RES(get_mode(pipe1[0]), _ret == 0000);
+	TEST_RES(get_mode(pipe1[1]), _ret == 0000);
+	TEST_RES(get_mode(pipe2[0]), _ret == 0600);
+	TEST_RES(get_mode(pipe2[1]), _ret == 0600);
+}
+END_TEST()
+
+FN_TEST(sockets_do_not_share_inode)
+{
+	int sock[2];
+	TEST_SUCC(socketpair(AF_UNIX, SOCK_STREAM, 0, sock));
+
+	TEST_RES(get_mode(sock[0]), _ret == 0777);
+	TEST_RES(get_mode(sock[1]), _ret == 0777);
+
+	set_mode(sock[0], 0000);
+
+	TEST_RES(get_mode(sock[0]), _ret == 0000);
+	TEST_RES(get_mode(sock[1]), _ret == 0777);
+}
+END_TEST()
+
+FN_TEST(anon_inodefs_share_inode)
+{
+	int fd;
+
+	// eventfd
+	fd = TEST_SUCC(eventfd(0, EFD_CLOEXEC));
+	TEST_RES(get_mode(fd), _ret == 0600);
+	set_mode(fd, 0000);
+	TEST_RES(get_mode(fd), _ret == 0000);
+	TEST_SUCC(close(fd));
+
+	// timerfd
+	fd = TEST_SUCC(timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC));
+	TEST_RES(get_mode(fd), _ret == 0000);
+	set_mode(fd, 0111);
+	TEST_RES(get_mode(fd), _ret == 0111);
+	TEST_SUCC(close(fd));
+
+	// signalfd
+	sigset_t mask;
+	TEST_SUCC(sigemptyset(&mask));
+	TEST_SUCC(sigaddset(&mask, SIGUSR1));
+	fd = TEST_SUCC(signalfd(-1, &mask, SFD_CLOEXEC));
+	TEST_RES(get_mode(fd), _ret == 0111);
+	set_mode(fd, 0222);
+	TEST_RES(get_mode(fd), _ret == 0222);
+	TEST_SUCC(close(fd));
+
+	// epollfd
+	fd = TEST_SUCC(epoll_create1(EPOLL_CLOEXEC));
+	TEST_RES(get_mode(fd), _ret == 0222);
+	set_mode(fd, 0600);
+	TEST_RES(get_mode(fd), _ret == 0600);
+	TEST_SUCC(close(fd));
+}
+END_TEST()

test/src/apps/scripts/process.sh

@@ -44,6 +44,7 @@ process/job_control
 process/pidfd
 process/wait4
 procfs/pid_mem
+pseudofs/pseudo_inode
 pthread/pthread_test
 pty/close_pty
 pty/open_pty