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b9c361e4af
Compiler memory barriers do not prevent the CPU from executing the code out of order. Switch to C11 atomics. This also lets us get rid of the mutex; instead, loop until the compare_exchange succeeds. While here, change the return value of at_quick_exit() on failure to the more traditional -1, matching atexit(). Sponsored by: Klara, Inc. Reviewed by: Olivier Certner, kevans, kib Differential Revision: https://reviews.freebsd.org/D41936 (cherry picked from commit 1dc3abb052430279e47c8922d22b30922adcf0f6) libc: Add a rudimentary test for quick_exit(3). Sponsored by: Klara, Inc. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D41937 (cherry picked from commit c7dd4601aeebbc1bbe131cbe6747476c124b47fe)
81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
/*-
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* Copyright (c) 2023 Klara, Inc.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <sys/wait.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <atf-c.h>
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static void func_a(void)
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{
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if (write(STDOUT_FILENO, "a", 1) != 1)
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_Exit(1);
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}
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static void func_b(void)
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{
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if (write(STDOUT_FILENO, "b", 1) != 1)
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_Exit(1);
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}
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static void func_c(void)
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{
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if (write(STDOUT_FILENO, "c", 1) != 1)
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_Exit(1);
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}
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static void child(void)
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{
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// this will be received by the parent
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printf("hello, ");
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fflush(stdout);
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// this won't, because quick_exit() does not flush
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printf("world");
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// these will be called in reverse order, producing "abc"
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if (at_quick_exit(func_c) != 0 ||
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at_quick_exit(func_b) != 0 ||
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at_quick_exit(func_a) != 0)
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_Exit(1);
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quick_exit(0);
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}
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ATF_TC_WITHOUT_HEAD(quick_exit);
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ATF_TC_BODY(quick_exit, tc)
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{
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char buf[100] = "";
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ssize_t len;
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int p[2], wstatus = 0;
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pid_t pid;
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ATF_REQUIRE(pipe(p) == 0);
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pid = fork();
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if (pid == 0) {
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if (dup2(p[1], STDOUT_FILENO) < 0)
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_Exit(1);
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(void)close(p[1]);
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(void)close(p[0]);
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child();
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_Exit(1);
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}
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ATF_REQUIRE_MSG(pid > 0,
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"expect fork() to succeed");
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ATF_CHECK_EQ_MSG(pid, waitpid(pid, &wstatus, 0),
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"expect to collect child process");
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ATF_CHECK_EQ_MSG(0, wstatus,
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"expect child to exit cleanly");
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ATF_CHECK_MSG((len = read(p[0], buf, sizeof(buf))) > 0,
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"expect to receive output from child");
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ATF_CHECK_STREQ("hello, abc", buf);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, quick_exit);
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return (atf_no_error());
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}
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