1 files changed, 135 insertions, 0 deletions
diff --git a/sysklogd/logread.c b/sysklogd/logread.c
new file mode 100644
index 000000000..3bf4c541e
--- /dev/null
+++ b/sysklogd/logread.c
@@ -0,0 +1,135 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * circular buffer syslog implementation for busybox
+ *
+ * Copyright (C) 2000 by Gennady Feldman <gfeldman@cachier.com>
+ *
+ * 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
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ipc.h>
+#include <sys/types.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+#include <signal.h>
+#include <setjmp.h>
+#include "busybox.h"
+static const long KEY_ID = 0x414e4547; /*"GENA"*/
+static struct shbuf_ds {
+        int size;               // size of data written
+        int head;               // start of message list
+        int tail;               // end of message list
+        char data[1];           // data/messages
+} *buf = NULL;                  // shared memory pointer
+// Semaphore operation structures
+static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT | SEM_UNDO}}; // set SMrup
+static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn
+static int      shmid = -1;     // ipc shared memory id
+static int      semid = -1;     // ipc semaphore id
+static jmp_buf  jmp_env;
+static void error_exit(const char *str);
+static void interrupted(int sig);
+/*
+ * sem_up - up()'s a semaphore.
+ */
+static inline void sem_up(int semid)
+{
+        if ( semop(semid, SMrup, 1) == -1 ) 
+                error_exit("semop[SMrup]");
+}
+/*
+ * sem_down - down()'s a semaphore
+ */                             
+static inline void sem_down(int semid)
+{
+        if ( semop(semid, SMrdn, 2) == -1 )
+                error_exit("semop[SMrdn]");
+}
+extern int logread_main(int argc, char **argv)
+{
+        int i;
+        
+        /* no options, no getopt */
+        if (argc > 1)
+                show_usage();
+        
+        // handle intrrupt signal
+        if (setjmp(jmp_env)) goto output_end;
+        
+        // attempt to redefine ^C signal
+        signal(SIGINT, interrupted);
+        
+        if ( (shmid = shmget(KEY_ID, 0, 0)) == -1)
+                error_exit("Can't find circular buffer");
+        
+        // Attach shared memory to our char*
+        if ( (buf = shmat(shmid, NULL, SHM_RDONLY)) == NULL)
+                error_exit("Can't get access to circular buffer from syslogd");
+        if ( (semid = semget(KEY_ID, 0, 0)) == -1)
+                error_exit("Can't get access to semaphone(s) for circular buffer from syslogd");
+        sem_down(semid);        
+        // Read Memory 
+        i=buf->head;
+        //printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size);
+        if (buf->head == buf->tail) {
+                printf("<empty syslog>\n");
+        }
+        
+        while ( i != buf->tail) {
+                printf("%s", buf->data+i);
+                i+= strlen(buf->data+i) + 1;
+                if (i >= buf->size )
+                        i=0;
+        }
+        sem_up(semid);
+output_end:
+        if (shmid != -1) 
+                shmdt(buf);
+                
+        return EXIT_SUCCESS;            
+}
+static void interrupted(int sig){
+        signal(SIGINT, SIG_IGN);
+        longjmp(jmp_env, 1);
+}
+static void error_exit(const char *str){
+        perror(str);
+        //release all acquired resources
+        if (shmid != -1) 
+                shmdt(buf);
+        exit(1);
+}

diff --git a/sysklogd/logread.c b/sysklogd/logread.c new file mode 100644 index 000000000..3bf4c541e --- /dev/null +++ b/sysklogd/logread.c
@@ -0,0 +1,135 @@
	1	/* vi: set sw=4 ts=4: */
	2	/*
	3	* circular buffer syslog implementation for busybox
	4	*
	5	* Copyright (C) 2000 by Gennady Feldman <gfeldman@cachier.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	* 02111-1307 USA
	21	*
	22	*/
	23
	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27	#include <sys/ipc.h>
	28	#include <sys/types.h>
	29	#include <sys/sem.h>
	30	#include <sys/shm.h>
	31	#include <signal.h>
	32	#include <setjmp.h>
	33	#include "busybox.h"
	34
	35	static const long KEY_ID = 0x414e4547; /"GENA"/
	36
	37	static struct shbuf_ds {
	38	int size; // size of data written
	39	int head; // start of message list
	40	int tail; // end of message list
	41	char data[1]; // data/messages
	42	} *buf = NULL; // shared memory pointer
	43
	44
	45	// Semaphore operation structures
	46	static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT \| SEM_UNDO}}; // set SMrup
	47	static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn
	48
	49	static int shmid = -1; // ipc shared memory id
	50	static int semid = -1; // ipc semaphore id
	51	static jmp_buf jmp_env;
	52
	53	static void error_exit(const char *str);
	54	static void interrupted(int sig);
	55
	56	/*
	57	* sem_up - up()'s a semaphore.
	58	*/
	59	static inline void sem_up(int semid)
	60	{
	61	if ( semop(semid, SMrup, 1) == -1 )
	62	error_exit("semop[SMrup]");
	63	}
	64
	65	/*
	66	* sem_down - down()'s a semaphore
	67	*/
	68	static inline void sem_down(int semid)
	69	{
	70	if ( semop(semid, SMrdn, 2) == -1 )
	71	error_exit("semop[SMrdn]");
	72	}
	73
	74	extern int logread_main(int argc, char **argv)
	75	{
	76	int i;
	77
	78	/* no options, no getopt */
	79	if (argc > 1)
	80	show_usage();
	81
	82	// handle intrrupt signal
	83	if (setjmp(jmp_env)) goto output_end;
	84
	85	// attempt to redefine ^C signal
	86	signal(SIGINT, interrupted);
	87
	88	if ( (shmid = shmget(KEY_ID, 0, 0)) == -1)
	89	error_exit("Can't find circular buffer");
	90
	91	// Attach shared memory to our char*
	92	if ( (buf = shmat(shmid, NULL, SHM_RDONLY)) == NULL)
	93	error_exit("Can't get access to circular buffer from syslogd");
	94
	95	if ( (semid = semget(KEY_ID, 0, 0)) == -1)
	96	error_exit("Can't get access to semaphone(s) for circular buffer from syslogd");
	97
	98	sem_down(semid);
	99	// Read Memory
	100	i=buf->head;
	101
	102	//printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size);
	103	if (buf->head == buf->tail) {
	104	printf("<empty syslog>\n");
	105	}
	106
	107	while ( i != buf->tail) {
	108	printf("%s", buf->data+i);
	109	i+= strlen(buf->data+i) + 1;
	110	if (i >= buf->size )
	111	i=0;
	112	}
	113	sem_up(semid);
	114
	115	output_end:
	116	if (shmid != -1)
	117	shmdt(buf);
	118
	119	return EXIT_SUCCESS;
	120	}
	121
	122	static void interrupted(int sig){
	123	signal(SIGINT, SIG_IGN);
	124	longjmp(jmp_env, 1);
	125	}
	126
	127	static void error_exit(const char *str){
	128	perror(str);
	129	//release all acquired resources
	130	if (shmid != -1)
	131	shmdt(buf);
	132
	133	exit(1);
	134	}
	135