/*
 * vdso_restorer.c - tests vDSO-based signal restore
 * Copyright (c) 2015 Andrew Lutomirski
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 * This makes sure that sa_restorer == NULL keeps working on 32-bit
 * configurations.  Modern glibc doesn't use it under any circumstances,
 * so it's easy to overlook breakage.
 *
 * 64-bit userspace has never supported sa_restorer == NULL, so this is
 * 32-bit only.
 */

#define _GNU_SOURCE

#include <err.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <syscall.h>
#include <sys/syscall.h>

/* Open-code this -- the headers are too messy to easily use them. */
struct real_sigaction {
	void *handler;
	unsigned long flags;
	void *restorer;
	unsigned int mask[2];
};

static volatile sig_atomic_t handler_called;

static void handler_with_siginfo(int sig, siginfo_t *info, void *ctx_void)
{
	handler_called = 1;
}

static void handler_without_siginfo(int sig)
{
	handler_called = 1;
}

int main()
{
	int nerrs = 0;
	struct real_sigaction sa;

	memset(&sa, 0, sizeof(sa));
	sa.handler = handler_with_siginfo;
	sa.flags = SA_SIGINFO;
	sa.restorer = NULL;	/* request kernel-provided restorer */

	if (syscall(SYS_rt_sigaction, SIGUSR1, &sa, NULL, 8) != 0)
		err(1, "raw rt_sigaction syscall");

	raise(SIGUSR1);

	if (handler_called) {
		printf("[OK]\tSA_SIGINFO handler returned successfully\n");
	} else {
		printf("[FAIL]\tSA_SIGINFO handler was not called\n");
		nerrs++;
	}

	sa.flags = 0;
	sa.handler = handler_without_siginfo;
	if (syscall(SYS_sigaction, SIGUSR1, &sa, 0) != 0)
		err(1, "raw sigaction syscall");
	handler_called = 0;

	raise(SIGUSR1);

	if (handler_called) {
		printf("[OK]\t!SA_SIGINFO handler returned successfully\n");
	} else {
		printf("[FAIL]\t!SA_SIGINFO handler was not called\n");
		nerrs++;
	}
}
thor</option>
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='961a9c0a4a9783e47f8cb76134b2303c4872380b'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Florian Westphal &lt;fw@strlen.de&gt;</td><td class='right'>2017-01-09 14:20:45 +0100</td></tr>
<tr><th>committer</th><td>Steffen Klassert &lt;steffen.klassert@secunet.com&gt;</td><td class='right'>2017-01-10 10:57:12 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=961a9c0a4a9783e47f8cb76134b2303c4872380b'>961a9c0a4a9783e47f8cb76134b2303c4872380b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=961a9c0a4a9783e47f8cb76134b2303c4872380b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=961a9c0a4a9783e47f8cb76134b2303c4872380b'>6ed7931dce807c558a0f6f73d52c2f83bfc817ff</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=b3b73b8e6df685ba61476b256f98eff1d650c199'>b3b73b8e6df685ba61476b256f98eff1d650c199</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=961a9c0a4a9783e47f8cb76134b2303c4872380b&amp;id2=b3b73b8e6df685ba61476b256f98eff1d650c199'>diff</a>)</td></tr></table>
<div class='commit-subject'>xfrm: remove unused function</div><div class='commit-msg'>Has been ifdef'd out for more than 10 years, remove it.

Signed-off-by: Florian Westphal &lt;fw@strlen.de&gt;
Signed-off-by: Steffen Klassert &lt;steffen.klassert@secunet.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=961a9c0a4a9783e47f8cb76134b2303c4872380b'>Diffstat</a></div><table summary='diffstat' class='diffstat'>