Programma di test della syscall syslog, e revisione generale

[gapil.git] / sources / mydmesg.c

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+/* mydmesg.c
+ * 
+ * Copyright (C) 2011 Simone Piccardi
+ * 
+ * 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 3 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*****************************************************************************
+ *
+ * File mydmesg.c: An example for klogctl function
+ *
+ * Author: S. Piccardi Aug. 2011
+ *
+ *****************************************************************************/
+#include <sys/types.h>   /* primitive system data types */
+#include <sys/stat.h>    /* file characteristics constants and functions */
+#include <stdlib.h>      /* C standard library */
+#include <stdio.h>       /* standard I/O library */
+#include <unistd.h>      /* unix standard library */
+#include <sys/klog.h>
+
+
+/*
+ * Program mydmesg
+ */
+/* Help printing routine */
+void usage(void);
+
+int main(int argc, char *argv[]) 
+{
+/* 
+ * Variables definition
+ */
+    int i, len, cmd=0, level=7, third;
+    char * buffer;
+    char * err_msg[]= {
+       "This is a NOP so it should'nt happen",
+       "This is a NOP so it should'nt happen",
+       "Error on reading kernel log buffer last messages",
+       "Error on reading kernel log buffer",
+       "Error on reading kernel and clearing log buffer",
+       "Error on clearing log buffer",
+       "Error on setting console log level to minimum",
+       "Error on setting console log level to default",
+       "Error on setting console log level",
+       "Error on reading unread message size",
+       "Error on reading log buffer size"
+    };
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "c:l:h")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':                                  /* help option */
+           printf("Wrong -h option use\n");
+           usage();
+           return -1;
+           break;
+        case 'c':                                  /* klogctl command */
+            cmd = strtol(optarg, NULL, 10);        /* convert input */
+            break;
+        case 'l':                                  /* log level */
+            level = strtol(optarg, NULL, 10);      /* convert input */
+            break;
+       case '?':                                  /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:                                   /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    if ((argc - optind) != 0) {   /* There must be 0 remaing arguments */
+       printf("Wrong number of arguments %d\n", argc - optind);
+        usage();
+    }
+    if ((cmd < 1) || (cmd>10)) {
+       printf("You must give a value between 1 and 10 for the -c option\n");
+       usage();
+    }
+    i = klogctl(10, NULL, 0);
+    if ((buffer = malloc(i+1)) == NULL) {
+       printf("Cannot allocate buffer for %d bytes\n", i);
+       exit(1);
+    } else {
+       printf("Allocated %d bytes\n", i);
+    }
+
+    /* setting third argument */
+    if (cmd == 8) third=level;
+    else third=i;
+
+
+    if ((len = klogctl(cmd, buffer, third)) < 0) {
+           perror(err_msg[cmd]);
+           exit(0);                  
+    }
+
+    switch (cmd) 
+    {
+    case 2:
+    case 3:
+    case 4:
+       printf("Debug, cmd = %d\n", cmd);
+       printf("Debug, len = %d\n", len);
+       buffer[len]=0;
+       printf("%s", buffer);
+       exit(0);
+    case 5:
+    case 6:
+    case 7:
+    case 8:
+       printf("Operation %d executed", cmd);
+       exit(0);
+    case 9:
+       printf("Kernel log buffer ring has %d bytes\n", len);
+       exit(0);
+    case 10:
+       printf("Kernel log buffer ring is %d bytes\n", len);
+       exit(0);
+    }
+
+
+    exit(0);
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program mydmesg: klogctl testing \n");
+    printf("Usage:\n");
+    printf(" mydmesg [-h] [-l N] -c command \n");
+    printf("  -h   print this help\n");
+    printf("  -c   klogctl command (mandatory)\n");
+    printf("  -l   level\n");
+    exit(1);
+}