mirror of
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dos2unix logread.c
This commit is contained in:
Mark Whitley
parent
2825ee8c2c
commit
b0c2b7dfe3
292
logread.c
292
logread.c
@ -1,146 +1,146 @@
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/* vi: set sw=4 ts=4: */
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/* vi: set sw=4 ts=4: */
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/*
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/*
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* circular buffer syslog implementation for busybox
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* circular buffer syslog implementation for busybox
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*
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*
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* Copyright (C) 2000 by Gennady Feldman <gfeldman@cachier.com>
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* Copyright (C) 2000 by Gennady Feldman <gfeldman@cachier.com>
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*
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*
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* Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
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* Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
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*
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*
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* This program is free software; you can redistribute it and/or modify
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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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* 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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* 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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* (at your option) any later version.
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*
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*
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* This program is distributed in the hope that it will be useful,
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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
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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||||||
* General Public License for more details.
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* General Public License for more details.
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||||||
*
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*
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* You should have received a copy of the GNU General Public License
|
* 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
|
* along with this program; if not, write to the Free Software
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||||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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* 02111-1307 USA
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*
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*
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*/
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*/
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <sys/ipc.h>
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#include <sys/ipc.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/sem.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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#include <sys/shm.h>
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#include <signal.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <setjmp.h>
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#include "busybox.h"
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#include "busybox.h"
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/* Stupid libc doesn't have a reliable way for use to know
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/* Stupid libc doesn't have a reliable way for use to know
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* that libc5 is being used. Assume this is good enough */
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* that libc5 is being used. Assume this is good enough */
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#if ! defined __GLIBC__ && ! defined __UCLIBC__
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#if ! defined __GLIBC__ && ! defined __UCLIBC__
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#error Sorry. Looks like you are using libc5.
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#error Sorry. Looks like you are using libc5.
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#error libc5 shm support isnt good enough.
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#error libc5 shm support isnt good enough.
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#error Please disable BB_FEATURE_IPC_SYSLOG
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#error Please disable BB_FEATURE_IPC_SYSLOG
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#endif
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#endif
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static const long KEY_ID = 0x414e4547; /*"GENA"*/
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static const long KEY_ID = 0x414e4547; /*"GENA"*/
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static struct shbuf_ds {
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static struct shbuf_ds {
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int size; // size of data written
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int size; // size of data written
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int head; // start of message list
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int head; // start of message list
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int tail; // end of message list
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int tail; // end of message list
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char data[1]; // data/messages
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char data[1]; // data/messages
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} *buf = NULL; // shared memory pointer
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} *buf = NULL; // shared memory pointer
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// Semaphore operation structures
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// Semaphore operation structures
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static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT | SEM_UNDO}}; // set SMrup
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static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT | SEM_UNDO}}; // set SMrup
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static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn
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static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn
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static int shmid = -1; // ipc shared memory id
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static int shmid = -1; // ipc shared memory id
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static int semid = -1; // ipc semaphore id
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static int semid = -1; // ipc semaphore id
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static jmp_buf jmp_env;
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static jmp_buf jmp_env;
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static void error_exit(const char *str);
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static void error_exit(const char *str);
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static void interrupted(int sig);
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static void interrupted(int sig);
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/*
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/*
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* sem_up - up()'s a semaphore.
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* sem_up - up()'s a semaphore.
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*/
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*/
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static inline void sem_up(int semid)
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static inline void sem_up(int semid)
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{
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{
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if ( semop(semid, SMrup, 1) == -1 )
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if ( semop(semid, SMrup, 1) == -1 )
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error_exit("semop[SMrup]");
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error_exit("semop[SMrup]");
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}
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}
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/*
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/*
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* sem_down - down()'s a semaphore
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* sem_down - down()'s a semaphore
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*/
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*/
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static inline void sem_down(int semid)
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static inline void sem_down(int semid)
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{
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{
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if ( semop(semid, SMrdn, 2) == -1 )
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if ( semop(semid, SMrdn, 2) == -1 )
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error_exit("semop[SMrdn]");
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error_exit("semop[SMrdn]");
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}
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}
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extern int logread_main(int argc, char **argv)
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extern int logread_main(int argc, char **argv)
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{
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{
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int i;
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int i;
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/* no options, no getopt */
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/* no options, no getopt */
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if (argc > 1)
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if (argc > 1)
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show_usage();
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show_usage();
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// handle intrrupt signal
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// handle intrrupt signal
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if (setjmp(jmp_env)) goto output_end;
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if (setjmp(jmp_env)) goto output_end;
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// attempt to redefine ^C signal
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// attempt to redefine ^C signal
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signal(SIGINT, interrupted);
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signal(SIGINT, interrupted);
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if ( (shmid = shmget(KEY_ID, 0, 0)) == -1)
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if ( (shmid = shmget(KEY_ID, 0, 0)) == -1)
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error_exit("Can't find circular buffer");
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error_exit("Can't find circular buffer");
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// Attach shared memory to our char*
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// Attach shared memory to our char*
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if ( (buf = shmat(shmid, NULL, SHM_RDONLY)) == NULL)
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if ( (buf = shmat(shmid, NULL, SHM_RDONLY)) == NULL)
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error_exit("Can't get access to circular buffer from syslogd");
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error_exit("Can't get access to circular buffer from syslogd");
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if ( (semid = semget(KEY_ID, 0, 0)) == -1)
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if ( (semid = semget(KEY_ID, 0, 0)) == -1)
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error_exit("Can't get access to semaphone(s) for circular buffer from syslogd");
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error_exit("Can't get access to semaphone(s) for circular buffer from syslogd");
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sem_down(semid);
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sem_down(semid);
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// Read Memory
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// Read Memory
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i=buf->head;
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i=buf->head;
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//printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size);
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//printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size);
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if (buf->head == buf->tail) {
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if (buf->head == buf->tail) {
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printf("<empty syslog>\n");
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printf("<empty syslog>\n");
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}
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}
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while ( i != buf->tail) {
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while ( i != buf->tail) {
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printf("%s", buf->data+i);
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printf("%s", buf->data+i);
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i+= strlen(buf->data+i) + 1;
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i+= strlen(buf->data+i) + 1;
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if (i >= buf->size )
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if (i >= buf->size )
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i=0;
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i=0;
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}
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}
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sem_up(semid);
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sem_up(semid);
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output_end:
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output_end:
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if (shmid != -1)
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if (shmid != -1)
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shmdt(buf);
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shmdt(buf);
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return EXIT_SUCCESS;
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return EXIT_SUCCESS;
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}
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}
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static void interrupted(int sig){
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static void interrupted(int sig){
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signal(SIGINT, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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longjmp(jmp_env, 1);
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longjmp(jmp_env, 1);
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}
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}
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static void error_exit(const char *str){
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static void error_exit(const char *str){
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perror(str);
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perror(str);
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//release all acquired resources
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//release all acquired resources
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if (shmid != -1)
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if (shmid != -1)
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shmdt(buf);
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shmdt(buf);
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exit(1);
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exit(1);
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}
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}
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@ -1,146 +1,146 @@
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/* vi: set sw=4 ts=4: */
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/* vi: set sw=4 ts=4: */
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/*
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/*
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* circular buffer syslog implementation for busybox
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* circular buffer syslog implementation for busybox
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*
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*
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* Copyright (C) 2000 by Gennady Feldman <gfeldman@cachier.com>
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* Copyright (C) 2000 by Gennady Feldman <gfeldman@cachier.com>
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*
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*
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* Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
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* Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
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*
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*
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* This program is free software; you can redistribute it and/or modify
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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
|
* 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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* 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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* (at your option) any later version.
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*
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*
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* This program is distributed in the hope that it will be useful,
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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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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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||||||
* General Public License for more details.
|
* General Public License for more details.
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*
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*
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* You should have received a copy of the GNU General Public License
|
* 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
|
* along with this program; if not, write to the Free Software
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||||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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* 02111-1307 USA
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*
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*
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*/
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*/
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <sys/ipc.h>
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#include <sys/ipc.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/sem.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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#include <sys/shm.h>
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#include <signal.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <setjmp.h>
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#include "busybox.h"
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#include "busybox.h"
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|
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/* Stupid libc doesn't have a reliable way for use to know
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/* Stupid libc doesn't have a reliable way for use to know
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* that libc5 is being used. Assume this is good enough */
|
* that libc5 is being used. Assume this is good enough */
|
||||||
#if ! defined __GLIBC__ && ! defined __UCLIBC__
|
#if ! defined __GLIBC__ && ! defined __UCLIBC__
|
||||||
#error Sorry. Looks like you are using libc5.
|
#error Sorry. Looks like you are using libc5.
|
||||||
#error libc5 shm support isnt good enough.
|
#error libc5 shm support isnt good enough.
|
||||||
#error Please disable BB_FEATURE_IPC_SYSLOG
|
#error Please disable BB_FEATURE_IPC_SYSLOG
|
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#endif
|
#endif
|
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|
|
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|
|
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static const long KEY_ID = 0x414e4547; /*"GENA"*/
|
static const long KEY_ID = 0x414e4547; /*"GENA"*/
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|
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static struct shbuf_ds {
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static struct shbuf_ds {
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int size; // size of data written
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int size; // size of data written
|
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int head; // start of message list
|
int head; // start of message list
|
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int tail; // end of message list
|
int tail; // end of message list
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char data[1]; // data/messages
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char data[1]; // data/messages
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} *buf = NULL; // shared memory pointer
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} *buf = NULL; // shared memory pointer
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|
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|
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// Semaphore operation structures
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// Semaphore operation structures
|
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static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT | SEM_UNDO}}; // set SMrup
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static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT | SEM_UNDO}}; // set SMrup
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static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn
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static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn
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|
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static int shmid = -1; // ipc shared memory id
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static int shmid = -1; // ipc shared memory id
|
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static int semid = -1; // ipc semaphore id
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static int semid = -1; // ipc semaphore id
|
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static jmp_buf jmp_env;
|
static jmp_buf jmp_env;
|
||||||
|
|
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static void error_exit(const char *str);
|
static void error_exit(const char *str);
|
||||||
static void interrupted(int sig);
|
static void interrupted(int sig);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* sem_up - up()'s a semaphore.
|
* sem_up - up()'s a semaphore.
|
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*/
|
*/
|
||||||
static inline void sem_up(int semid)
|
static inline void sem_up(int semid)
|
||||||
{
|
{
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if ( semop(semid, SMrup, 1) == -1 )
|
if ( semop(semid, SMrup, 1) == -1 )
|
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error_exit("semop[SMrup]");
|
error_exit("semop[SMrup]");
|
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}
|
}
|
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|
|
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/*
|
/*
|
||||||
* sem_down - down()'s a semaphore
|
* sem_down - down()'s a semaphore
|
||||||
*/
|
*/
|
||||||
static inline void sem_down(int semid)
|
static inline void sem_down(int semid)
|
||||||
{
|
{
|
||||||
if ( semop(semid, SMrdn, 2) == -1 )
|
if ( semop(semid, SMrdn, 2) == -1 )
|
||||||
error_exit("semop[SMrdn]");
|
error_exit("semop[SMrdn]");
|
||||||
}
|
}
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|
|
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extern int logread_main(int argc, char **argv)
|
extern int logread_main(int argc, char **argv)
|
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{
|
{
|
||||||
int i;
|
int i;
|
||||||
|
|
||||||
/* no options, no getopt */
|
/* no options, no getopt */
|
||||||
if (argc > 1)
|
if (argc > 1)
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show_usage();
|
show_usage();
|
||||||
|
|
||||||
// handle intrrupt signal
|
// handle intrrupt signal
|
||||||
if (setjmp(jmp_env)) goto output_end;
|
if (setjmp(jmp_env)) goto output_end;
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||||||
|
|
||||||
// attempt to redefine ^C signal
|
// attempt to redefine ^C signal
|
||||||
signal(SIGINT, interrupted);
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signal(SIGINT, interrupted);
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||||||
|
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if ( (shmid = shmget(KEY_ID, 0, 0)) == -1)
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if ( (shmid = shmget(KEY_ID, 0, 0)) == -1)
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||||||
error_exit("Can't find circular buffer");
|
error_exit("Can't find circular buffer");
|
||||||
|
|
||||||
// Attach shared memory to our char*
|
// Attach shared memory to our char*
|
||||||
if ( (buf = shmat(shmid, NULL, SHM_RDONLY)) == NULL)
|
if ( (buf = shmat(shmid, NULL, SHM_RDONLY)) == NULL)
|
||||||
error_exit("Can't get access to circular buffer from syslogd");
|
error_exit("Can't get access to circular buffer from syslogd");
|
||||||
|
|
||||||
if ( (semid = semget(KEY_ID, 0, 0)) == -1)
|
if ( (semid = semget(KEY_ID, 0, 0)) == -1)
|
||||||
error_exit("Can't get access to semaphone(s) for circular buffer from syslogd");
|
error_exit("Can't get access to semaphone(s) for circular buffer from syslogd");
|
||||||
|
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||||||
sem_down(semid);
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sem_down(semid);
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// Read Memory
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// Read Memory
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||||||
i=buf->head;
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i=buf->head;
|
||||||
|
|
||||||
//printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size);
|
//printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size);
|
||||||
if (buf->head == buf->tail) {
|
if (buf->head == buf->tail) {
|
||||||
printf("<empty syslog>\n");
|
printf("<empty syslog>\n");
|
||||||
}
|
}
|
||||||
|
|
||||||
while ( i != buf->tail) {
|
while ( i != buf->tail) {
|
||||||
printf("%s", buf->data+i);
|
printf("%s", buf->data+i);
|
||||||
i+= strlen(buf->data+i) + 1;
|
i+= strlen(buf->data+i) + 1;
|
||||||
if (i >= buf->size )
|
if (i >= buf->size )
|
||||||
i=0;
|
i=0;
|
||||||
}
|
}
|
||||||
sem_up(semid);
|
sem_up(semid);
|
||||||
|
|
||||||
output_end:
|
output_end:
|
||||||
if (shmid != -1)
|
if (shmid != -1)
|
||||||
shmdt(buf);
|
shmdt(buf);
|
||||||
|
|
||||||
return EXIT_SUCCESS;
|
return EXIT_SUCCESS;
|
||||||
}
|
}
|
||||||
|
|
||||||
static void interrupted(int sig){
|
static void interrupted(int sig){
|
||||||
signal(SIGINT, SIG_IGN);
|
signal(SIGINT, SIG_IGN);
|
||||||
longjmp(jmp_env, 1);
|
longjmp(jmp_env, 1);
|
||||||
}
|
}
|
||||||
|
|
||||||
static void error_exit(const char *str){
|
static void error_exit(const char *str){
|
||||||
perror(str);
|
perror(str);
|
||||||
//release all acquired resources
|
//release all acquired resources
|
||||||
if (shmid != -1)
|
if (shmid != -1)
|
||||||
shmdt(buf);
|
shmdt(buf);
|
||||||
|
|
||||||
exit(1);
|
exit(1);
|
||||||
}
|
}
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user