1 | /*
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2 | $Id: libmondo-fifo.c 2332 2009-08-18 13:33:19Z bruno $
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3 | */
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4 |
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5 | /**
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6 | * @file
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7 | * Functions to handle buffering of tape archives as they are read/written.
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8 | * This used the external program @c buffer mostly.
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9 | */
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10 |
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11 | #include <unistd.h>
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12 | #include <stdio.h>
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13 | #include <signal.h>
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14 | #include <fcntl.h>
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15 | #include <stdio.h>
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16 |
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17 | #include <errno.h>
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18 | #include <sys/types.h>
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19 | #include <sys/stat.h>
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20 | #include <sys/ipc.h>
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21 |
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22 | #include "my-stuff.h"
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23 | #include "mr_mem.h"
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24 | #include "mondostructures.h"
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25 | #include "libmondo.h"
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26 |
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27 | /**
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28 | * @addtogroup globalGroup
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29 | * @{
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30 | */
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31 | /**
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32 | * The SIGPIPE handler sets this to TRUE.
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33 | */
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34 | bool g_sigpipe = FALSE;
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35 |
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36 | /**
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37 | * PID of the "main" process.
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38 | */
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39 | pid_t g_mastermind_pid = 0;
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40 |
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41 |
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42 |
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43 | /**
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44 | * Command line with which @c buffer was invoked.
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45 | */
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46 | char g_sz_call_to_buffer[MAX_STR_LEN];
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47 |
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48 | /**
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49 | * Size of the buffer used with @c buffer.
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50 | */
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51 | int g_tape_buffer_size_MB = 0;
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52 |
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53 | /* @} - end of globalGroup */
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54 |
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55 | extern char *ps_options;
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56 | extern char *ps_proc_id;
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57 | extern char *MONDO_LOGFILE;
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58 |
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59 | /**
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60 | * @addtogroup fifoGroup
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61 | * @{
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62 | */
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63 | /**
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64 | * Open a pipe to/from @c buffer.
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65 | * If buffer does not work at all, we use `dd'.
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66 | * @param device The device to read from/write to.
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67 | * @param direction @c 'r' (reading) or @c 'w' (writing).
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68 | * @return A file pointer to/from the @c buffer process.
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69 | */
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70 | FILE *open_device_via_buffer(char *device, char direction,
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71 | long internal_tape_block_size)
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72 | {
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73 | char keych;
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74 | char *sz_dir = NULL;
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75 | char *tmp = NULL;
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76 | char *command = NULL;
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77 | FILE *fres;
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78 | int bufsize; // in megabytes
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79 | int res;
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80 | int wise_upper_limit;
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81 | int wise_lower_limit;
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82 |
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83 | assert_string_is_neither_NULL_nor_zerolength(device);
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84 | assert(direction == 'w' || direction == 'r');
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85 | wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
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86 | wise_lower_limit = 1; // wise_upper_limit/2 + 1;
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87 | paranoid_system("sync");
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88 | for (bufsize = wise_upper_limit, res = -1;
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89 | res != 0 && bufsize >= wise_lower_limit; bufsize--) {
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90 | mr_asprintf(tmp,"dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c", internal_tape_block_size, bufsize, 'm');
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91 | res = run_program_and_log_output(tmp, 2);
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92 | mr_free(tmp);
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93 | }
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94 | if (!res) {
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95 | bufsize++;
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96 | log_to_screen(tmp, "Negotiated max buffer of %d MB ", bufsize);
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97 | } else {
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98 | bufsize = 0;
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99 | res = 0;
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100 | log_to_screen
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101 | ("Cannot negotiate a buffer of ANY size. Using dd instead.");
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102 | }
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103 | if (direction == 'r') {
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104 | keych = 'i';
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105 | } else {
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106 | keych = 'o';
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107 | }
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108 | if (bufsize) {
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109 | sprintf(g_sz_call_to_buffer,
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110 | "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
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111 | (direction == 'r') ? 20 : 75, internal_tape_block_size,
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112 | keych, device, MONDO_LOGFILE);
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113 | } else {
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114 | sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
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115 | internal_tape_block_size, keych, device);
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116 | }
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117 | log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
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118 | mr_asprintf(sz_dir, "%c", direction);
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119 | fres = popen(g_sz_call_to_buffer, sz_dir);
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120 | mr_free(sz_dir);
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121 |
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122 | if (fres) {
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123 | log_msg(2, "Successfully opened ('%c') tape device %s", direction,
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124 | device);
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125 | } else {
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126 | log_msg(2, "Failed to open ('%c') tape device %s", direction,
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127 | device);
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128 | }
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129 | sleep(2);
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130 | mr_asprintf(tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
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131 | if (run_program_and_log_output(tmp, 2)) {
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132 | log_msg(2, "Warning - I think I failed to open tape, actually.");
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133 | }
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134 | mr_free(tmp);
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135 | g_tape_buffer_size_MB = bufsize;
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136 | mr_asprintf(command, "ps %s | grep buffer | grep -v grep", ps_options);
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137 | if (run_program_and_log_output(command, 1)) {
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138 | fres = NULL;
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139 | log_to_screen("Failed to open tape streamer. Buffer error.");
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140 | } else {
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141 | log_to_screen("Buffer successfully started.");
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142 | }
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143 | mr_free(command);
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144 |
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145 | return (fres);
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146 | }
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147 |
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148 |
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149 | /**
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150 | * Kill @c buffer processes.
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151 | * Only called in mondoarchive
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152 | */
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153 | void kill_buffer()
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154 | {
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155 | char *tmp = NULL;
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156 | char *command = NULL;
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157 |
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158 | if (g_sz_call_to_buffer == NULL) {
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159 | return;
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160 | }
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161 | if (strcmp(g_sz_call_to_buffer,"") == 0) {
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162 | return;
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163 | }
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164 | paranoid_system("sync");
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165 | mr_asprintf(command, "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
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166 | log_msg(2, "kill_buffer() --- command = %s", command);
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167 | mr_asprintf(tmp, "%s", call_program_and_get_last_line_of_output(command));
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168 | mr_free(command);
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169 |
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170 | mr_asprintf(command, "kill %s", tmp);
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171 | log_msg(2, "kill_buffer() --- command = %s", command);
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172 | if (strlen(tmp) > 0) {
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173 | run_program_and_log_output(command, TRUE);
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174 | }
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175 | mr_free(tmp);
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176 | mr_free(command);
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177 | }
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178 |
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179 |
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180 |
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181 |
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182 |
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183 | /**
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184 | * Handler for SIGPIPE.
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185 | * @param sig The signal that occurred (hopefully SIGPIPE).
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186 | */
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187 | void sigpipe_occurred(int sig)
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188 | {
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189 | g_sigpipe = TRUE;
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190 | }
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191 |
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192 | /* @} - end of fifoGroup */
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