From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/tools/testing/selftests/memfd/memfd_test.c | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/kernel/tools/testing/selftests/memfd/memfd_test.c b/kernel/tools/testing/selftests/memfd/memfd_test.c
index c67d32e..fba322d 100644
--- a/kernel/tools/testing/selftests/memfd/memfd_test.c
+++ b/kernel/tools/testing/selftests/memfd/memfd_test.c
@@ -290,6 +290,40 @@
munmap(p, mfd_def_size);
}
+static void mfd_assert_fork_private_write(int fd)
+{
+ int *p;
+ pid_t pid;
+
+ p = mmap(NULL,
+ mfd_def_size,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE,
+ fd,
+ 0);
+ if (p == MAP_FAILED) {
+ printf("mmap() failed: %m\n");
+ abort();
+ }
+
+ p[0] = 22;
+
+ pid = fork();
+ if (pid == 0) {
+ p[0] = 33;
+ exit(0);
+ } else {
+ waitpid(pid, NULL, 0);
+
+ if (p[0] != 22) {
+ printf("MAP_PRIVATE copy-on-write failed: %m\n");
+ abort();
+ }
+ }
+
+ munmap(p, mfd_def_size);
+}
+
static void mfd_assert_write(int fd)
{
ssize_t l;
@@ -421,6 +455,7 @@
printf("mmap()+mprotect() didn't fail as expected\n");
abort();
}
+ munmap(p, mfd_def_size);
}
/* verify PUNCH_HOLE fails */
@@ -760,6 +795,8 @@
mfd_assert_read_shared(fd2);
mfd_fail_write(fd2);
+ mfd_assert_fork_private_write(fd);
+
munmap(p, mfd_def_size);
close(fd2);
close(fd);
--
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