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annotate toys/pending/klogd.c @ 974:5a50be9d00a7

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The attached KLOGD patch is an improved version of the one you have in hg. This also has a fix for boundary condition crash.
author Ashwini Sharma <ak.ashwini@gmail.com>
date Mon, 29 Jul 2013 00:42:30 -0500
parents 144d5ba7d410
children 00c7b6f4104a
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1 /* klogd.c - Klogd, The kernel log Dameon.
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2 *
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3 * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
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4 *
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5 * No standard
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6
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7 USE_KLOGD(NEWTOY(klogd, "c#<1>8n", TOYFLAG_SBIN))
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8
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9 config KLOGD
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10 bool "klogd"
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11 default n
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12 help
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13 usage: klogd [-n] [-c N]
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14
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15 -c N Print to console messages more urgent than prio N (1-8)"
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16 -n Run in foreground.
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17
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18 config KLOGD_SOURCE_RING_BUFFER
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19 bool "enable kernel ring buffer as log source."
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20 default n
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21 depends on KLOGD
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22 */
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23
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24 #define FOR_klogd
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25 #include "toys.h"
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26 #include <signal.h>
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27 GLOBALS(
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28 long level;
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29 int fd;
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30 )
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31
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32 #if CFG_KLOGD_SOURCE_RING_BUFFER
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33 #include <sys/klog.h>
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34 static void open_klogd(void)
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35 {
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36 syslog(LOG_NOTICE, "KLOGD: started with Kernel ring buffer as log source\n");
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37 klogctl(1, NULL, 0);
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38 }
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39
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40 static int read_klogd(char *bufptr, int len)
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41 {
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42 return klogctl(2, bufptr, len);
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43 }
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44
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45 static void set_log_level(int level)
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46 {
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47 klogctl(8, NULL, level);
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48 }
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49
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50 static void close_klogd(void)
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51 {
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52 klogctl(7, NULL, 0);
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53 klogctl(0, NULL, 0);
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54 }
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55 #else
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56 static void open_klogd(void)
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57 {
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58 TT.fd = xopen("/proc/kmsg", O_RDONLY); //_PATH_KLOG in paths.h
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59 syslog(LOG_NOTICE, "KLOGD: started with /proc/kmsg as log source\n");
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60 }
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61
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62 static int read_klogd(char *bufptr, int len)
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63 {
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64 return xread(TT.fd, bufptr, len);
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65 }
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66
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67 static void set_log_level(int level)
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68 {
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69 FILE *fptr = xfopen("/proc/sys/kernel/printk", "w");
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70 fprintf(fptr, "%u\n", level);
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71 fclose(fptr);
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72 fptr = NULL;
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73 }
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75 static void close_klogd(void)
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76 {
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77 set_log_level(7);
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78 xclose(TT.fd);
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79 }
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80 #endif
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81
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82 static void handle_signal(int sig)
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83 {
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84 close_klogd();
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85 syslog(LOG_NOTICE,"KLOGD: Daemon exiting......");
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86 exit(1);
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87 }
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88
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89 static int daemonize(void)
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90 {
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91 pid_t pid;
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92 int fd = open("/dev/null", O_RDWR);
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93 if (fd < 0) fd = open("/", O_RDONLY, 0666);
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94 if((pid = fork()) < 0) {
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95 perror_msg("DAEMON: fail to fork");
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96 return -1;
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97 }
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98 if (pid) exit(EXIT_SUCCESS);
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99
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100 setsid();
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101 dup2(fd, 0);
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102 dup2(fd, 1);
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103 dup2(fd, 2);
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104 if (fd > 2) close(fd);
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105 return 0;
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106 }
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107
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108 /*
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109 * Read kernel ring buffer in local buff and keep track of
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110 * "used" amount to track next read to start.
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111 */
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112 void klogd_main(void)
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113 {
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114 int prio, size, used = 0;
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115 char *start, *line_start, msg_buffer[16348]; //LOG_LINE_LENGTH - Ring buffer size
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116
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117 sigatexit(handle_signal);
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118 if (toys.optflags & FLAG_c) set_log_level(TT.level); //set log level
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119 if (!(toys.optflags & FLAG_n)) daemonize(); //Make it daemon
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120 open_klogd();
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121 openlog("Kernel", 0, LOG_KERN); //open connection to system logger..
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122
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123 while(1) {
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124 start = msg_buffer + used; //start updated for re-read.
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125 size = read_klogd(start, sizeof(msg_buffer) - used - 1);
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126 if (size < 0) perror_exit("error reading file:");
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127 start[size] = '\0'; //Ensure last line to be NUL terminated.
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128 if (used) start = msg_buffer;
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129 while(start) {
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130 if ((line_start = strsep(&start, "\n")) != NULL && start != NULL) used = 0;
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131 else { //Incomplete line, copy it to start of buff.
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132 used = strlen(line_start);
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133 strcpy(msg_buffer, line_start);
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134 if (used < (sizeof(msg_buffer) - 1)) break;
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135 used = 0; //we have buffer full, log it as it is.
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136 }
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137 prio = LOG_INFO; //we dont know priority, mark it INFO
974
5a50be9d00a7 The attached KLOGD patch is an improved version of the one you have in hg.
Ashwini Sharma <ak.ashwini@gmail.com>
parents: 955
diff changeset
138 if (*line_start == '<') { //we have new line to syslog
950
a4a6bcf32657 klogd, submitted by Ashwini Sharma.
Rob Landley <rob@landley.net>
parents:
diff changeset
139 line_start++;
974
5a50be9d00a7 The attached KLOGD patch is an improved version of the one you have in hg.
Ashwini Sharma <ak.ashwini@gmail.com>
parents: 955
diff changeset
140 if (line_start) prio = (int)strtoul(line_start, &line_start, 10);
5a50be9d00a7 The attached KLOGD patch is an improved version of the one you have in hg.
Ashwini Sharma <ak.ashwini@gmail.com>
parents: 955
diff changeset
141 if (*line_start == '>') line_start++;
950
a4a6bcf32657 klogd, submitted by Ashwini Sharma.
Rob Landley <rob@landley.net>
parents:
diff changeset
142 }
974
5a50be9d00a7 The attached KLOGD patch is an improved version of the one you have in hg.
Ashwini Sharma <ak.ashwini@gmail.com>
parents: 955
diff changeset
143 if (*line_start) syslog(prio, "%s", line_start);
950
a4a6bcf32657 klogd, submitted by Ashwini Sharma.
Rob Landley <rob@landley.net>
parents:
diff changeset
144 }
a4a6bcf32657 klogd, submitted by Ashwini Sharma.
Rob Landley <rob@landley.net>
parents:
diff changeset
145 }
974
5a50be9d00a7 The attached KLOGD patch is an improved version of the one you have in hg.
Ashwini Sharma <ak.ashwini@gmail.com>
parents: 955
diff changeset
146 }