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From dbe9747b4f09bd2f4d63af06e55c2c3ed35bfca1 Mon Sep 17 00:00:00 2001
From: Phillip Lougher <phillip@squashfs.org.uk>
Date: Tue, 7 Feb 2023 23:09:30 +0000
Subject: [PATCH] Don't use sigwaitinfo()/sigtimedwait() if not supported
If sigwaitinfo() and sigtimedwait() are not supported,
use sigwait() instead.
This will disable the queue/caches dump if ^\ (SIGQUIT)
is hit twice within a second.
But the queue/caches dump is still available if SIGHUP
is sent to the program.
Currently this check is applied to MAC OS X. FreeBSD and
NetBSD appear to have these functions.
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
---
squashfs-tools/info.c | 25 ++-------------
squashfs-tools/signals.h | 54 ++++++++++++++++++++++++++++++++
squashfs-tools/unsquashfs_info.c | 25 ++-------------
3 files changed, 60 insertions(+), 44 deletions(-)
create mode 100644 squashfs-tools/signals.h
--- a/squashfs-tools/info.c
+++ b/squashfs-tools/info.c
@@ -2,7 +2,7 @@
* Create a squashfs filesystem. This is a highly compressed read only
* filesystem.
*
- * Copyright (c) 2013, 2014, 2019, 2021
+ * Copyright (c) 2013, 2014, 2019, 2021, 2022, 2023
* Phillip Lougher <phillip@squashfs.org.uk>
*
* This program is free software; you can redistribute it and/or
@@ -42,6 +42,7 @@
#include "mksquashfs_error.h"
#include "progressbar.h"
#include "caches-queues-lists.h"
+#include "signals.h"
static int silent = 0;
static struct dir_ent *ent = NULL;
@@ -144,7 +145,6 @@ void dump_state()
void *info_thrd(void *arg)
{
sigset_t sigmask;
- struct timespec timespec = { .tv_sec = 1, .tv_nsec = 0 };
int sig, waiting = 0;
sigemptyset(&sigmask);
@@ -152,26 +152,7 @@ void *info_thrd(void *arg)
sigaddset(&sigmask, SIGHUP);
while(1) {
- if(waiting)
- sig = sigtimedwait(&sigmask, NULL, ×pec);
- else
- sig = sigwaitinfo(&sigmask, NULL);
-
- if(sig == -1) {
- switch(errno) {
- case EAGAIN:
- /* interval timed out */
- waiting = 0;
- /* FALLTHROUGH */
- case EINTR:
- /* if waiting, the wait will be longer, but
- that's OK */
- continue;
- default:
- BAD_ERROR("sigtimedwait/sigwaitinfo failed "
- "because %s\n", strerror(errno));
- }
- }
+ sig = wait_for_signal(&sigmask, &waiting);
if(sig == SIGQUIT && !waiting) {
print_filename();
--- /dev/null
+++ b/squashfs-tools/signals.h
@@ -0,0 +1,54 @@
+#ifndef SIGNALS_H
+#define SIGNALS_H
+/*
+ * Create a squashfs filesystem. This is a highly compressed read only
+ * filesystem.
+ *
+ * Copyright (c) 2023
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * 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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * signals.h
+ */
+
+static inline int wait_for_signal(sigset_t *sigmask, int *waiting)
+{
+ int sig;
+
+#if defined(__APPLE__) && defined(__MACH__)
+ sigwait(sigmask, &sig);
+ *waiting = 0;
+#else
+ struct timespec timespec = { .tv_sec = 1, .tv_nsec = 0 };
+
+ while(1) {
+ if(*waiting)
+ sig = sigtimedwait(sigmask, NULL, ×pec);
+ else
+ sig = sigwaitinfo(sigmask, NULL);
+
+ if(sig != -1)
+ break;
+
+ if(errno == EAGAIN)
+ *waiting = 0;
+ else if(errno != EINTR)
+ BAD_ERROR("sigtimedwait/sigwaitinfo failed because %s\n", strerror(errno));
+ }
+#endif
+ return sig;
+}
+#endif
--- a/squashfs-tools/unsquashfs_info.c
+++ b/squashfs-tools/unsquashfs_info.c
@@ -2,7 +2,7 @@
* Create a squashfs filesystem. This is a highly compressed read only
* filesystem.
*
- * Copyright (c) 2013, 2021
+ * Copyright (c) 2013, 2021, 2023
* Phillip Lougher <phillip@squashfs.org.uk>
*
* This program is free software; you can redistribute it and/or
@@ -40,6 +40,7 @@
#include "squashfs_fs.h"
#include "unsquashfs.h"
#include "unsquashfs_error.h"
+#include "signals.h"
char *pathname = NULL;
@@ -96,7 +97,6 @@ void dump_state()
void *info_thrd(void *arg)
{
sigset_t sigmask;
- struct timespec timespec = { .tv_sec = 1, .tv_nsec = 0 };
int sig, waiting = 0;
sigemptyset(&sigmask);
@@ -104,26 +104,7 @@ void *info_thrd(void *arg)
sigaddset(&sigmask, SIGHUP);
while(1) {
- if(waiting)
- sig = sigtimedwait(&sigmask, NULL, ×pec);
- else
- sig = sigwaitinfo(&sigmask, NULL);
-
- if(sig == -1) {
- switch(errno) {
- case EAGAIN:
- /* interval timed out */
- waiting = 0;
- /* FALLTHROUGH */
- case EINTR:
- /* if waiting, the wait will be longer, but
- that's OK */
- continue;
- default:
- BAD_ERROR("sigtimedwait/sigwaitinfo failed "
- "because %s\n", strerror(errno));
- }
- }
+ sig = wait_for_signal(&sigmask, &waiting);
if(sig == SIGQUIT && !waiting) {
if(pathname)
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