mirror of
https://github.com/topjohnwu/ndk-busybox.git
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118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini update implementation for busybox; much pasted from update-2.11
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*
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (c) 1996, 1997, 1999 Torsten Poulin.
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* Copyright (c) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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* Note: This program is only necessary if you are running a 2.0.x (or
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* earlier) kernel. 2.2.x and higher flush filesystem buffers automatically.
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*/
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#include <sys/param.h>
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#include <sys/syslog.h>
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#include <unistd.h> /* for getopt() */
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#include <stdlib.h>
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#if __GNU_LIBRARY__ > 5
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#include <sys/kdaemon.h>
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#else
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extern int bdflush (int func, long int data);
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#endif
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#include "busybox.h"
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static unsigned int sync_duration = 30;
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static unsigned int flush_duration = 5;
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static int use_sync = 0;
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extern int update_main(int argc, char **argv)
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{
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int pid;
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int opt;
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while ((opt = getopt(argc, argv, "Ss:f:")) > 0) {
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switch (opt) {
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case 'S':
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use_sync = 1;
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break;
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case 's':
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sync_duration = atoi(optarg);
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break;
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case 'f':
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flush_duration = atoi(optarg);
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break;
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default:
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show_usage();
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}
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}
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pid = fork();
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if (pid < 0)
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return EXIT_FAILURE;
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else if (pid == 0) {
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/* Become a proper daemon */
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setsid();
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chdir("/");
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#ifdef OPEN_MAX
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for (pid = 0; pid < OPEN_MAX; pid++) close(pid);
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#else
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/* glibc 2.1.92 requires using sysconf(_SC_OPEN_MAX) */
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for (pid = 0; pid < sysconf(_SC_OPEN_MAX); pid++) close(pid);
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#endif
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/*
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* This is no longer necessary since 1.3.5x, but it will harmlessly
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* exit if that is the case.
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*/
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/* set the program name that will show up in a 'ps' listing */
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argv[0] = "bdflush (update)";
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argv[1] = NULL;
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argv[2] = NULL;
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for (;;) {
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if (use_sync) {
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sleep(sync_duration);
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sync();
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} else {
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sleep(flush_duration);
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if (bdflush(1, 0) < 0) {
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openlog("update", LOG_CONS, LOG_DAEMON);
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syslog(LOG_INFO,
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"This kernel does not need update(8). Exiting.");
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closelog();
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return EXIT_SUCCESS;
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}
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}
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}
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}
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return EXIT_SUCCESS;
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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