udevd: export current seqnum and add udevsettle
This commit is contained in:
Kay Sievers
parent
2b3f8e93ca
commit
7baada47be
6
Makefile
6
Makefile
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@ -50,6 +50,7 @@ PROGRAMS = \
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udev \
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udevd \
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udevtrigger \
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udevsettle \
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udevsend \
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udevcontrol \
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udevmonitor \
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@ -86,6 +87,7 @@ MAN_PAGES = \
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udevmonitor.8 \
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udevd.8 \
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udevtrigger.8 \
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udevsettle.8 \
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udevsend.8 \
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udevtest.8 \
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udevinfo.8 \
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@ -261,6 +263,7 @@ install-man:
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$(INSTALL_DATA) -D udevtest.8 $(DESTDIR)$(mandir)/man8/udevtest.8
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$(INSTALL_DATA) -D udevd.8 $(DESTDIR)$(mandir)/man8/udevd.8
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$(INSTALL_DATA) -D udevtrigger.8 $(DESTDIR)$(mandir)/man8/udevtrigger.8
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$(INSTALL_DATA) -D udevsettle.8 $(DESTDIR)$(mandir)/man8/udevsettle.8
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$(INSTALL_DATA) -D udevmonitor.8 $(DESTDIR)$(mandir)/man8/udevmonitor.8
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- ln -f -s udevd.8 $(DESTDIR)$(mandir)/man8/udevcontrol.8
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@extras="$(EXTRAS)"; for target in $$extras; do \
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@ -274,6 +277,7 @@ uninstall-man:
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- rm -f $(DESTDIR)$(mandir)/man8/udevtest.8
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- rm -f $(DESTDIR)$(mandir)/man8/udevd.8
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- rm -f $(DESTDIR)$(mandir)/man8/udevtrigger.8
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- rm -f $(DESTDIR)$(mandir)/man8/udevsettle.8
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- rm -f $(DESTDIR)$(mandir)/man8/udevmonitor.8
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- rm -f $(DESTDIR)$(mandir)/man8/udevcontrol.8
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@ extras="$(EXTRAS)"; for target in $$extras; do \
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@ -285,6 +289,7 @@ install-bin:
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$(INSTALL) -d $(DESTDIR)$(udevdir)
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$(INSTALL_PROGRAM) -D udevd $(DESTDIR)$(sbindir)/udevd
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$(INSTALL_PROGRAM) -D udevtrigger $(DESTDIR)$(sbindir)/udevtrigger
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$(INSTALL_PROGRAM) -D udevsettle $(DESTDIR)$(sbindir)/udevsettle
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$(INSTALL_PROGRAM) -D udevcontrol $(DESTDIR)$(sbindir)/udevcontrol
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$(INSTALL_PROGRAM) -D udevmonitor $(DESTDIR)$(usrsbindir)/udevmonitor
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$(INSTALL_PROGRAM) -D udevinfo $(DESTDIR)$(usrbindir)/udevinfo
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@ -302,6 +307,7 @@ endif
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uninstall-bin:
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- rm -f $(DESTDIR)$(sbindir)/udevd
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- rm -f $(DESTDIR)$(sbindir)/udevtrigger
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- rm -f $(DESTDIR)$(sbindir)/udevsettle
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- rm -f $(DESTDIR)$(sbindir)/udevcontrol
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- rm -f $(DESTDIR)$(usrsbindir)/udevmonitor
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- rm -f $(DESTDIR)$(usrbindir)/udevinfo
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15
udevd.c
15
udevd.c
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@ -279,8 +279,23 @@ static void udev_event_run(struct uevent_msg *msg)
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static void msg_queue_insert(struct uevent_msg *msg)
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{
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char filename[PATH_SIZE];
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int fd;
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msg->queue_time = time(NULL);
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strlcpy(filename, udev_root, sizeof(filename));
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strlcat(filename, "/" EVENT_SEQNUM, sizeof(filename));
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fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
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if (fd > 0) {
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char str[32];
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int len;
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len = sprintf(str, "%llu\n", msg->seqnum);
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write(fd, str, len);
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close(fd);
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}
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export_event_state(msg, EVENT_QUEUED);
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/* run all events with a timeout set immediately */
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1
udevd.h
1
udevd.h
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@ -31,6 +31,7 @@
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#define EVENT_QUEUE_DIR ".udev/queue"
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#define EVENT_FAILED_DIR ".udev/failed"
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#define EVENT_SEQNUM ".udev/uevent_seqnum"
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/* maximum limit of forked childs */
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#define UDEVD_MAX_CHILDS 64
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32
udevsettle.8
Normal file
32
udevsettle.8
Normal file
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@ -0,0 +1,32 @@
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.\" ** You probably do not want to edit this file directly **
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.\" It was generated using the DocBook XSL Stylesheets (version 1.69.1).
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.\" Instead of manually editing it, you probably should edit the DocBook XML
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.\" source for it and then use the DocBook XSL Stylesheets to regenerate it.
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.TH "UDEVSETTLE" "8" "March 2006" "udev" "udevsettle"
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.SH "NAME"
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udevsettle \- wait until queued kernel/udev events are handled
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.SH "SYNOPSIS"
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.HP 11
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\fBudevsettle\fR [\fB\-\-timeout=\fR\fB\fIseconds\fR\fR]
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.SH "DESCRIPTION"
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.PP
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Waits watching the udev event queue and exits if all current events are handled.
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.SH "OPTIONS"
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.TP
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\fB\-\-timeout=\fR\fB\fIseconds\fR\fR
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maximum seconds to wait for the queue to become empty.
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.SH "ENVIRONMENT"
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.TP
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\fBUDEV_LOG\fR
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Overrides the syslog priority specified in the config file.
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.SH "AUTHOR"
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.PP
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Written by Kay Sievers
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<kay.sievers@vrfy.org>.
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.SH "SEE ALSO"
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.PP
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\fBudev\fR(7)
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155
udevsettle.c
Normal file
155
udevsettle.c
Normal file
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@ -0,0 +1,155 @@
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/*
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* udevsettle.c
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*
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* Copyright (C) 2006 Kay Sievers <kay@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "udev.h"
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#include "udevd.h"
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#define LOOP_PER_SECOND 20
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static const char *udev_log_str;
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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if (priority > udev_log_priority)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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int main(int argc, char *argv[], char *envp[])
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{
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char queuename[PATH_SIZE];
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char filename[PATH_SIZE];
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unsigned long long seq_kernel;
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unsigned long long seq_udev;
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char seqnum[32];
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int fd;
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ssize_t len;
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int timeout = 30;
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int loop;
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int i;
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int rc = 1;
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logging_init("udevsettle");
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udev_config_init();
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dbg("version %s", UDEV_VERSION);
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udev_log_str = getenv("UDEV_LOG");
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for (i = 1 ; i < argc; i++) {
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char *arg = argv[i];
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if (strncmp(arg, "--timeout=", 10) == 0) {
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char *str = &arg[10];
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timeout = atoi(str);
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dbg("timeout=%i", timeout);
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if (timeout <= 0) {
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fprintf(stderr, "Invalid timeout value.\n");
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goto exit;
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}
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} else {
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fprintf(stderr, "Usage: udevsettle [--timeout=<seconds>]\n");
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goto exit;
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}
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}
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sysfs_init();
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strlcpy(queuename, udev_root, sizeof(queuename));
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strlcat(queuename, "/" EVENT_QUEUE_DIR, sizeof(queuename));
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loop = timeout * LOOP_PER_SECOND;
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while (loop--) {
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/* wait for events in queue to finish */
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while (loop--) {
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struct stat statbuf;
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if (stat(queuename, &statbuf) < 0) {
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info("queue is empty");
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break;
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}
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usleep(1000 * 1000 / LOOP_PER_SECOND);
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}
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if (loop <= 0) {
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info("timeout waiting for queue");
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goto exit;
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}
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/* read current kernel seqnum */
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strlcpy(filename, sysfs_path, sizeof(filename));
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strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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goto exit;
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len = read(fd, seqnum, sizeof(seqnum)-1);
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close(fd);
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if (len <= 0)
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goto exit;
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seqnum[len] = '\0';
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seq_kernel = strtoull(seqnum, NULL, 10);
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info("kernel seqnum = %llu", seq_kernel);
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/* read current udev seqnum */
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strlcpy(filename, udev_root, sizeof(filename));
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strlcat(filename, "/" EVENT_SEQNUM, sizeof(filename));
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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goto exit;
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len = read(fd, seqnum, sizeof(seqnum)-1);
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close(fd);
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if (len <= 0)
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goto exit;
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seqnum[len] = '\0';
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seq_udev = strtoull(seqnum, NULL, 10);
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info("udev seqnum = %llu", seq_udev);
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/* make sure all kernel events have arrived in the queue */
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if (seq_udev >= seq_kernel) {
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info("queue is empty and no pending events left");
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rc = 0;
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goto exit;
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}
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usleep(1000 * 1000 / LOOP_PER_SECOND);
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info("queue is empty, but events still pending");
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}
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exit:
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sysfs_cleanup();
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logging_close();
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return rc;
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}
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82
udevsettle.xml
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82
udevsettle.xml
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@ -0,0 +1,82 @@
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<?xml version='1.0'?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<article>
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<articleinfo>
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<title>xmlto</title>
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<author>
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<firstname>Kay</firstname>
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<surname>Sievers</surname>
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<email>kay.sievers@vrfy.org</email>
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</author>
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<copyright>
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<year>2006</year>
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<holder>Kay Sievers</holder>
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</copyright>
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</articleinfo>
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<section>
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<title>udevsettle</title>
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<refentry>
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<refentryinfo>
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<title>udevsettle</title>
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<date>March 2006</date>
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<productname>udev</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>udevsettle</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>udevsettle</refname><refpurpose>wait until queued kernel/udev events are handled</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>udevsettle</command>
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<arg><option>--timeout=<replaceable>seconds</replaceable></option></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1><title>DESCRIPTION</title>
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<para>Waits watching the udev event queue and exits if all current events are handled.</para>
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</refsect1>
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<refsect1><title>OPTIONS</title>
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<variablelist>
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<varlistentry>
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<term><option>--timeout=<replaceable>seconds</replaceable></option></term>
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<listitem>
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<para>maximum seconds to wait for the queue to become empty.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1><title>ENVIRONMENT</title>
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<variablelist>
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<varlistentry>
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<term><option>UDEV_LOG</option></term>
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<listitem>
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<para>Overrides the syslog priority specified in the config file.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1><title>AUTHOR</title>
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<para>Written by Kay Sievers <email>kay.sievers@vrfy.org</email>.</para>
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</refsect1>
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<refsect1>
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<title>SEE ALSO</title>
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<para><citerefentry>
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<refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
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</citerefentry></para>
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</refsect1>
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</refentry>
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</section>
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</article>
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