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/*
* Copyright (C) 2013-2017 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(__linux__) && NEED_GLIBC(2,8,0)
#include <sys/signalfd.h>
/*
* stress_sigfd
* stress signalfd reads
*/
int stress_sigfd(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
pid_t pid, ppid = getpid();
int sfd;
sigset_t mask;
(void)instance;
sigemptyset(&mask);
sigaddset(&mask, SIGRTMIN);
if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0) {
pr_fail_dbg(name, "sigprocmask");
return EXIT_FAILURE;
}
sfd = signalfd(-1, &mask, 0);
if (sfd < 0) {
pr_fail_dbg(name, "signalfd");
return EXIT_FAILURE;
}
again:
pid = fork();
if (pid < 0) {
if (opt_do_run && (errno == EAGAIN))
goto again;
pr_fail_dbg(name, "fork");
return EXIT_FAILURE;
} else if (pid == 0) {
(void)setpgid(0, pgrp);
stress_parent_died_alarm();
while (opt_do_run) {
union sigval s;
int ret;
memset(&s, 0, sizeof(s));
s.sival_int = 0;
ret = sigqueue(ppid, SIGRTMIN, s);
if (ret < 0)
break;
}
(void)close(sfd);
_exit(0);
} else {
/* Parent */
int status;
(void)setpgid(pid, pgrp);
do {
int ret;
struct signalfd_siginfo fdsi;
ret = read(sfd, &fdsi, sizeof(fdsi));
if ((ret < 0) || (ret != sizeof(fdsi))) {
if ((errno == EAGAIN) || (errno == EINTR))
continue;
if (errno) {
pr_fail_dbg(name, "signalfd read");
(void)close(sfd);
_exit(EXIT_FAILURE);
}
continue;
}
if (ret == 0)
break;
if (opt_flags & OPT_FLAGS_VERIFY) {
if (fdsi.ssi_signo != (uint32_t)SIGRTMIN) {
pr_fail(stderr, "%s: unexpected signal %d",
name, fdsi.ssi_signo);
break;
}
}
(*counter)++;
} while (opt_do_run && (!max_ops || *counter < max_ops));
/* terminal child */
(void)kill(pid, SIGKILL);
(void)waitpid(pid, &status, 0);
}
return EXIT_SUCCESS;
}
#else
int stress_sigfd(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
return stress_not_implemented(counter, instance, max_ops, name);
}
#endif
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