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https://github.com/SerenityOS/serenity
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ebaa9f9d35
Adds the following tests: * if there are multiple shared mmaps for the same file, writes to one mmap region should be visible in the other mmap regions. * if you write to a file with write(), those changes should be visible in shared mmaps for that file. * if you write to a shared mmap, those changes should be visible when you read() from the file. * if you write to a private mmap, any changes you make should not be visible when you read() the file.
41 lines
1.0 KiB
C++
41 lines
1.0 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/mman.h>
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static u8* private_ptr = nullptr;
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size_t const mmap_len = 0x1000;
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static void private_zero_length_inode_vmobject_sync_signal_handler(int)
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{
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auto rc = msync(private_ptr, mmap_len, MS_ASYNC);
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EXPECT(rc == 0);
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rc = munmap(private_ptr, mmap_len);
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EXPECT(rc == 0);
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exit(0);
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}
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TEST_CASE(private_zero_length_inode_vmobject_sync)
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{
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{
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struct sigaction new_action {
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{ private_zero_length_inode_vmobject_sync_signal_handler }, 0, 0
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};
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int rc = sigaction(SIGBUS, &new_action, nullptr);
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VERIFY(rc == 0);
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}
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int fd = open("/tmp/private_msync_test", O_RDWR | O_CREAT, 0644);
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VERIFY(fd >= 0);
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private_ptr = (u8*)mmap(nullptr, mmap_len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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EXPECT(private_ptr != MAP_FAILED);
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private_ptr[0] = 0x1;
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VERIFY_NOT_REACHED();
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}
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