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/*-
* Copyright (c) 2023 Klara, Inc.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <sys/resource.h>
#include <sys/wait.h>
#include <errno.h>
#include <libutil.h>
#include <unistd.h>
#include <atf-c.h>
ATF_TC(forkfail);
ATF_TC_HEAD(forkfail, tc)
{
atf_tc_set_md_var(tc, "descr", "Check for fd leak when fork() fails");
atf_tc_set_md_var(tc, "require.user", "unprivileged");
}
ATF_TC_BODY(forkfail, tc)
{
struct rlimit orl, nrl;
pid_t pid;
int prevfd, fd, pty;
/* set process limit to 1 so fork() will fail */
ATF_REQUIRE_EQ(0, getrlimit(RLIMIT_NPROC, &orl));
nrl = orl;
nrl.rlim_cur = 1;
ATF_REQUIRE_EQ(0, setrlimit(RLIMIT_NPROC, &nrl));
/* check first free fd */
ATF_REQUIRE((fd = dup(0)) > 0);
ATF_REQUIRE_EQ(0, close(fd));
/* attempt forkpty() */
pid = forkpty(&pty, NULL, NULL, NULL);
if (pid == 0) {
/* child - fork() unexpectedly succeeded */
_exit(0);
}
ATF_CHECK_ERRNO(EAGAIN, pid < 0);
if (pid > 0) {
/* parent - fork() unexpectedly succeeded */
(void)waitpid(pid, NULL, 0);
}
/* check that first free fd hasn't changed */
prevfd = fd;
ATF_REQUIRE((fd = dup(0)) > 0);
ATF_CHECK_EQ(prevfd, fd);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, forkfail);
return (atf_no_error());
}
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