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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/*
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* Copyright (c) 2022, Daniel Bertalan <dani@danielbertalan.dev>
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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 <stdio.h>
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#include <sys/wait.h>
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#include <unistd.h>
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// Test whether file writes are flushed to disk at program termination,
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// even if we do not close the files or call fflush().
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TEST_CASE(flush_on_exit)
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{
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static constexpr auto test_str = "peekaboo";
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auto pid = fork();
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VERIFY(pid >= 0);
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if (pid == 0) {
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auto* fp = fopen("/tmp/flushtest", "w");
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VERIFY(fp != nullptr);
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auto nwritten = fwrite(test_str, 1, strlen(test_str), fp);
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VERIFY(nwritten != 0);
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// We intentionally leak `fp` here.
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exit(0);
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} else {
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int wstatus;
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auto rc = waitpid(pid, &wstatus, 0);
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VERIFY(rc >= 0);
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char buf[256];
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auto* fp = fopen("/tmp/flushtest", "r");
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VERIFY(fp != nullptr);
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auto* sp = fgets(buf, sizeof(buf), fp);
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VERIFY(sp != nullptr);
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fclose(fp);
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unlink("/tmp/flushtest");
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EXPECT_EQ(strcmp(test_str, buf), 0);
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}
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}
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