X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=sysklogd%2Fklogd.c;h=c54e80a3525ca9ad2d91259aa2a79ad71feb6897;hb=a3aa3e309506ea96fa8f7546f6b22fa85263a934;hp=f2ab5ea7e7a89bcce694f64d1ef542e734a71f89;hpb=06c35da6af117f8c27ed16afe3915fbbc6c64de8;p=oweals%2Fbusybox.git diff --git a/sysklogd/klogd.c b/sysklogd/klogd.c index f2ab5ea7e..c54e80a35 100644 --- a/sysklogd/klogd.c +++ b/sysklogd/klogd.c @@ -2,158 +2,134 @@ /* * Mini klogd implementation for busybox * - * Copyright (C) 2001 by Gennady Feldman . + * Copyright (C) 2001 by Gennady Feldman . * Changes: Made this a standalone busybox module which uses standalone - * syslog() client interface. + * syslog() client interface. * - * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen - * Copyright (C) 1999,2000,2001 by Erik Andersen + * Copyright (C) 1999-2004 by Erik Andersen * * Copyright (C) 2000 by Karl M. Hegbloom * - * "circular buffer" Copyright (C) 2000 by Gennady Feldman + * "circular buffer" Copyright (C) 2000 by Gennady Feldman * - * Maintainer: Gennady Feldman as of Mar 12, 2001 - * - * 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 of the License, 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, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Maintainer: Gennady Feldman as of Mar 12, 2001 * + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ -#include -#include -#include /* for our signal() handlers */ -#include /* strncpy() */ -#include /* errno and friends */ -#include -#include -#include - -#if __GNU_LIBRARY__ < 5 -# ifdef __alpha__ -# define klogctl syslog -# endif -#else -# include -#endif - -#include "busybox.h" +#include "libbb.h" +#include +#include static void klogd_signal(int sig) { - klogctl(7, NULL, 0); - klogctl(0, 0, 0); - /* logMessage(0, "Kernel log daemon exiting."); */ - syslog_msg(LOG_SYSLOG, LOG_NOTICE, "Kernel log daemon exiting."); - exit(TRUE); + /* FYI: cmd 7 is equivalent to setting console_loglevel to 7 + * via klogctl(8, NULL, 7). */ + klogctl(7, NULL, 0); /* "7 -- Enable printk's to console" */ + klogctl(0, NULL, 0); /* "0 -- Close the log. Currently a NOP" */ + syslog(LOG_NOTICE, "klogd: exiting"); + kill_myself_with_sig(sig); } -static void doKlogd(void) __attribute__ ((noreturn)); -static void doKlogd(void) +#define log_buffer bb_common_bufsiz1 +enum { + KLOGD_LOGBUF_SIZE = sizeof(log_buffer), + OPT_LEVEL = (1 << 0), + OPT_FOREGROUND = (1 << 1), +}; + +int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int klogd_main(int argc UNUSED_PARAM, char **argv) { - int priority = LOG_INFO; - char log_buffer[4096]; - int i, n, lastc; - char *start; - - /* Set up sig handlers */ - signal(SIGINT, klogd_signal); - signal(SIGKILL, klogd_signal); - signal(SIGTERM, klogd_signal); + int i = 0; + char *opt_c; + int opt; + int used = 0; + + opt = getopt32(argv, "c:n", &opt_c); + if (opt & OPT_LEVEL) { + /* Valid levels are between 1 and 8 */ + i = xatou_range(opt_c, 1, 8); + } + if (!(opt & OPT_FOREGROUND)) { + bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv); + } + + openlog("kernel", 0, LOG_KERN); + + bb_signals(BB_FATAL_SIGS, klogd_signal); signal(SIGHUP, SIG_IGN); - /* "Open the log. Currently a NOP." */ + /* "Open the log. Currently a NOP" */ klogctl(1, NULL, 0); - syslog_msg(LOG_SYSLOG, LOG_NOTICE, "klogd started: " BB_BANNER); + /* "printk() prints a message on the console only if it has a loglevel + * less than console_loglevel". Here we set console_loglevel = i. */ + if (i) + klogctl(8, NULL, i); + + syslog(LOG_NOTICE, "klogd started: %s", bb_banner); while (1) { - /* Use kernel syscalls */ - memset(log_buffer, '\0', sizeof(log_buffer)); - n = klogctl(2, log_buffer, sizeof(log_buffer)); - if (n < 0) { - char message[80]; + int n; + int priority; + char *start; + /* "2 -- Read from the log." */ + start = log_buffer + used; + n = klogctl(2, start, KLOGD_LOGBUF_SIZE-1 - used); + if (n < 0) { if (errno == EINTR) continue; - snprintf(message, 79, - "klogd: Error return from sys_sycall: %d - %s.\n", errno, - strerror(errno)); - syslog_msg(LOG_SYSLOG, LOG_ERR, message); - exit(1); + syslog(LOG_ERR, "klogd: error %d in klogctl(2): %m", + errno); + break; } + start[n] = '\0'; /* klogctl buffer parsing modelled after code in dmesg.c */ - start = &log_buffer[0]; - lastc = '\0'; - for (i = 0; i < n; i++) { - if (lastc == '\0' && log_buffer[i] == '<') { - priority = 0; - i++; - while (isdigit(log_buffer[i])) { - priority = priority * 10 + (log_buffer[i] - '0'); - i++; + /* Process each newline-terminated line in the buffer */ + start = log_buffer; + while (1) { + char *newline = strchrnul(start, '\n'); + + if (*newline == '\0') { + /* This line is incomplete... */ + if (start != log_buffer) { + /* move it to the front of the buffer */ + overlapping_strcpy(log_buffer, start); + used = newline - start; + /* don't log it yet */ + break; } - if (log_buffer[i] == '>') - i++; - start = &log_buffer[i]; + /* ...but if buffer is full, log it anyway */ + used = 0; + newline = NULL; + } else { + *newline++ = '\0'; } - if (log_buffer[i] == '\n') { - log_buffer[i] = '\0'; /* zero terminate this message */ - syslog_msg(LOG_KERN, priority, start); - start = &log_buffer[i + 1]; - priority = LOG_INFO; - } - lastc = log_buffer[i]; - } - } -} -extern int klogd_main(int argc, char **argv) -{ - /* no options, no getopt */ - int opt; - int doFork = TRUE; + /* Extract the priority */ + priority = LOG_INFO; + if (*start == '<') { + start++; + if (*start) { + /* kernel never generates multi-digit prios */ + priority = (*start - '0'); + start++; + } + if (*start == '>') + start++; + } + /* Log (only non-empty lines) */ + if (*start) + syslog(priority, "%s", start); - /* do normal option parsing */ - while ((opt = getopt(argc, argv, "n")) > 0) { - switch (opt) { - case 'n': - doFork = FALSE; - break; - default: - show_usage(); + if (!newline) + break; + start = newline; } } - if (doFork) { -#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__) - if (daemon(0, 1) < 0) - perror_msg_and_die("daemon"); -#else - error_msg_and_die("daemon not supported"); -#endif - } - doKlogd(); - - return EXIT_SUCCESS; + return EXIT_FAILURE; } - -/* -Local Variables -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/