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https://github.com/freebsd/freebsd-src
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a4aaee2120
MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: allanjude Differential Revision: https://reviews.freebsd.org/D41491
59 lines
1.2 KiB
C
59 lines
1.2 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/resource.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <libutil.h>
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#include <unistd.h>
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#include <atf-c.h>
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ATF_TC(forkfail);
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ATF_TC_HEAD(forkfail, tc)
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{
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atf_tc_set_md_var(tc, "descr", "Check for fd leak when fork() fails");
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atf_tc_set_md_var(tc, "require.user", "unprivileged");
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}
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ATF_TC_BODY(forkfail, tc)
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{
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struct rlimit orl, nrl;
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pid_t pid;
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int prevfd, fd, pty;
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/* set process limit to 1 so fork() will fail */
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ATF_REQUIRE_EQ(0, getrlimit(RLIMIT_NPROC, &orl));
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nrl = orl;
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nrl.rlim_cur = 1;
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ATF_REQUIRE_EQ(0, setrlimit(RLIMIT_NPROC, &nrl));
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/* check first free fd */
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ATF_REQUIRE((fd = dup(0)) > 0);
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ATF_REQUIRE_EQ(0, close(fd));
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/* attempt forkpty() */
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pid = forkpty(&pty, NULL, NULL, NULL);
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if (pid == 0) {
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/* child - fork() unexpectedly succeeded */
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_exit(0);
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}
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ATF_CHECK_ERRNO(EAGAIN, pid < 0);
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if (pid > 0) {
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/* parent - fork() unexpectedly succeeded */
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(void)waitpid(pid, NULL, 0);
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}
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/* check that first free fd hasn't changed */
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prevfd = fd;
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ATF_REQUIRE((fd = dup(0)) > 0);
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ATF_CHECK_EQ(prevfd, fd);
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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, forkfail);
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return (atf_no_error());
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}
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