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https://github.com/systemd/systemd.git
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e5a5b54ab6
This patch fixes the reintroduced bug with the sig_handler(), if we link against a -mregparm=3 compiled klibc on i386. It also fixes some compiler warnings about redefined asmlinkage on some systems. Also some (broken?) compilers on distros throw out warnings if asmlinkage is before "static void". This fixes it, too.
193 lines
3.9 KiB
C
193 lines
3.9 KiB
C
/*
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* udev.c
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*
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* Userspace devfs
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*
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* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
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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 <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <signal.h>
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#include "libsysfs/sysfs/libsysfs.h"
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#include "udev.h"
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#include "udev_lib.h"
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#include "udev_version.h"
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#include "logging.h"
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#include "namedev.h"
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#include "udevdb.h"
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/* timeout flag for udevdb */
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extern sig_atomic_t gotalarm;
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/* global variables */
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char **main_argv;
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char **main_envp;
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#ifdef LOG
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unsigned char logname[LOGNAME_SIZE];
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void log_message(int level, const char *format, ...)
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{
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va_list args;
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if (!udev_log)
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return;
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va_start(args, format);
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vsyslog(level, format, args);
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va_end(args);
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}
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#endif
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static void asmlinkage sig_handler(int signum)
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{
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switch (signum) {
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case SIGALRM:
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gotalarm = 1;
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info("error: timeout reached, event probably not handled correctly");
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break;
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case SIGINT:
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case SIGTERM:
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udevdb_exit();
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exit(20 + signum);
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default:
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dbg("unhandled signal %d", signum);
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}
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}
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static char *subsystem_blacklist[] = {
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"scsi_host",
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"scsi_device",
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"usb_host",
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"pci_bus",
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"pcmcia_socket",
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""
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};
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int main(int argc, char *argv[], char *envp[])
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{
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main_argv = argv;
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main_envp = envp;
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struct sigaction act;
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char *action;
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char *devpath = "";
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char *subsystem = "";
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int i;
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int retval = -EINVAL;
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enum {
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ADD,
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REMOVE,
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UDEVSTART,
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} act_type;
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dbg("version %s", UDEV_VERSION);
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init_logging("udev");
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udev_init_config();
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if (strstr(argv[0], "udevstart")) {
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act_type = UDEVSTART;
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} else {
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action = get_action();
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if (!action) {
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dbg("no action?");
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goto exit;
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}
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if (strcmp(action, "add") == 0) {
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act_type = ADD;
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} else if (strcmp(action, "remove") == 0) {
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act_type = REMOVE;
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} else {
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dbg("unknown action '%s'", action);
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goto exit;
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}
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devpath = get_devpath();
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if (!devpath) {
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dbg("no devpath?");
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goto exit;
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}
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dbg("looking at '%s'", devpath);
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/* we only care about class devices and block stuff */
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if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
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dbg("not a block or class device");
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goto exit;
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}
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subsystem = get_subsystem(main_argv[1]);
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if (!subsystem) {
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dbg("no subsystem?");
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goto exit;
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}
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/* skip blacklisted subsystems */
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i = 0;
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while (subsystem_blacklist[i][0] != '\0') {
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if (strcmp(subsystem, subsystem_blacklist[i]) == 0) {
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dbg("don't care about '%s' devices", subsystem);
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goto exit;
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}
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i++;
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}
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}
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/* set signal handlers */
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act.sa_handler = (void (*) (int))sig_handler;
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sigemptyset (&act.sa_mask);
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/* alarm must interrupt syscalls*/
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sigaction(SIGALRM, &act, NULL);
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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/* trigger timout to interrupt blocking syscalls */
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alarm(ALARM_TIMEOUT);
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/* initialize udev database */
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if (udevdb_init(UDEVDB_DEFAULT) != 0)
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info("error: unable to initialize database, continuing without database");
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switch(act_type) {
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case UDEVSTART:
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dbg("udevstart");
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namedev_init();
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udev_sleep = 0;
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retval = udev_start();
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break;
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case ADD:
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dbg("udev add");
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namedev_init();
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retval = udev_add_device(devpath, subsystem, NOFAKE);
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break;
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case REMOVE:
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dbg("udev remove");
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retval = udev_remove_device(devpath, subsystem);
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}
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udevdb_exit();
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exit:
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return retval;
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}
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