[42] | 1 | /* $Id: libmondo-fifo.c 42 2005-10-03 23:32:14Z bcornec $ */
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[1] | 2 |
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| 3 | /**
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| 4 | * @file
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| 5 | * Functions to handle buffering of tape archives as they are read/written.
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| 6 | * This used the external program @c buffer mostly.
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| 7 | */
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| 8 |
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| 9 | #include <unistd.h>
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| 10 | #include <stdio.h>
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| 11 | #include <signal.h>
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[42] | 12 | #include <fcntl.h>
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[1] | 13 | #include <stdio.h>
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[42] | 14 |
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[1] | 15 | #include <errno.h>
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| 16 | #include <sys/types.h>
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| 17 | #include <sys/stat.h>
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| 18 | #include <sys/ipc.h>
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| 19 | #include <sys/shm.h>
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| 20 | #include <sys/sem.h>
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| 21 | #include <sys/wait.h>
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| 22 | #include <pthread.h>
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| 23 |
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| 24 | #include "my-stuff.h"
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| 25 | #include "mondostructures.h"
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| 26 | #include "libmondo.h"
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| 27 |
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| 28 | /**
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| 29 | * @addtogroup globalGroup
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * The SIGPIPE handler sets this to TRUE.
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| 34 | */
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[42] | 35 | bool g_sigpipe = FALSE;
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[1] | 36 |
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| 37 | /**
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| 38 | * PID of the "main" process.
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| 39 | */
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[42] | 40 | pid_t g_mastermind_pid = 0;
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[1] | 41 |
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| 42 |
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| 43 |
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| 44 | /**
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| 45 | * Command line with which @c buffer was invoked.
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| 46 | */
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[42] | 47 | char *g_sz_call_to_buffer;
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[1] | 48 |
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| 49 | /**
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| 50 | * Size of the buffer used with @c buffer.
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| 51 | */
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[42] | 52 | int g_tape_buffer_size_MB = 0;
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[1] | 53 |
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| 54 | /* @} - end of globalGroup */
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| 55 |
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| 56 |
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| 57 | /**
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| 58 | * @addtogroup fifoGroup
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| 59 | * @{
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| 60 | */
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| 61 | /**
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| 62 | * Open a pipe to/from @c buffer.
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| 63 | * If buffer does not work at all, we use `dd'.
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| 64 | * @param device The device to read from/write to.
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| 65 | * @param direction @c 'r' (reading) or @c 'w' (writing).
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| 66 | * @return A file pointer to/from the @c buffer process.
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| 67 | */
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[42] | 68 | FILE *open_device_via_buffer(char *device, char direction,
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| 69 | long internal_tape_block_size)
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[1] | 70 | {
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[42] | 71 | char *sz_dir;
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| 72 | char keych;
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| 73 | char *tmp;
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| 74 | FILE *fres;
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| 75 | int bufsize; // in megabytes
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| 76 | int res;
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| 77 | int wise_upper_limit;
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| 78 | int wise_lower_limit;
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[1] | 79 |
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[42] | 80 | assert_string_is_neither_NULL_nor_zerolength(device);
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| 81 | assert(direction == 'w' || direction == 'r');
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| 82 | asprintf(&sz_dir, "%c", direction);
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| 83 | wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
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| 84 | wise_lower_limit = 1; // wise_upper_limit/2 + 1;
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| 85 | paranoid_system("sync");
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| 86 | for (bufsize = wise_upper_limit, res = -1;
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| 87 | res != 0 && bufsize >= wise_lower_limit; bufsize--) {
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| 88 | asprintf(&tmp,
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| 89 | "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
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| 90 | internal_tape_block_size, bufsize, 'm');
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| 91 | res = run_program_and_log_output(tmp, 2);
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| 92 | paranoid_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 | asprintf(&tmp, "Negotiated max buffer of %d MB ", bufsize);
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| 97 | log_to_screen(tmp);
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| 98 | paranoid_free(tmp);
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| 99 | } else {
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| 100 | bufsize = 0;
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| 101 | res = 0;
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| 102 | log_to_screen
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| 103 | ("Cannot negotiate a buffer of ANY size. Using dd instead.");
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| 104 | }
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| 105 | if (direction == 'r') {
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| 106 | keych = 'i';
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| 107 | } else {
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| 108 | keych = 'o';
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| 109 | }
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| 110 | if (bufsize) {
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| 111 | asprintf(&g_sz_call_to_buffer,
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| 112 | "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize,
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| 113 | 'm', (direction == 'r') ? 20 : 75,
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| 114 | internal_tape_block_size, keych, device, MONDO_LOGFILE);
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| 115 | } else {
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| 116 | asprintf(&g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
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| 117 | internal_tape_block_size, keych, device);
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| 118 | }
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| 119 | log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
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| 120 | fres = popen(g_sz_call_to_buffer, sz_dir);
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| 121 | paranoid_free(sz_dir);
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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 | asprintf(&tmp, "ps wwax | grep \"%s\"", 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 | paranoid_free(tmp);
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| 135 | g_tape_buffer_size_MB = bufsize;
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| 136 | /* BERLIOS: usless ?
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| 137 | strcmp(tmp, g_sz_call_to_buffer);
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| 138 | tmp[30] = '\0';
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| 139 | */
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| 140 | asprintf(&tmp, "ps wwax | grep buffer | grep -v grep");
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| 141 | if (run_program_and_log_output(tmp, 1)) {
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| 142 | fres = NULL;
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| 143 | log_to_screen("Failed to open tape streamer. Buffer error.");
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| 144 | } else {
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| 145 | log_to_screen("Buffer successfully started.");
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| 146 | }
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| 147 | paranoid_free(tmp);
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| 148 | return (fres);
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[1] | 149 | }
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| 150 |
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| 151 |
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| 152 | /**
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| 153 | * Kill @c buffer processes.
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| 154 | */
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| 155 | void kill_buffer()
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| 156 | {
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[42] | 157 | char *tmp;
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| 158 | char *command;
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[1] | 159 |
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[42] | 160 | paranoid_system("sync");
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| 161 | asprintf(&command,
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| 162 | "ps wwax | fgrep \"%s\" | fgrep -v grep | awk '{print $1;}' | grep -v PID | tr -s '\n' ' ' | awk '{ print $1; }'",
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| 163 | g_sz_call_to_buffer);
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| 164 | paranoid_free(g_sz_call_to_buffer);
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| 165 | log_msg(2, "kill_buffer() --- command = %s", command);
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[1] | 166 |
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[42] | 167 | asprintf(&tmp, "%s",
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| 168 | call_program_and_get_last_line_of_output(command));
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| 169 | paranoid_free(command);
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[1] | 170 |
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[42] | 171 | asprintf(&command, "kill %s", tmp);
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| 172 | log_msg(2, "kill_buffer() --- command = %s", command);
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[1] | 173 |
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[42] | 174 | if (strlen(tmp) > 0) {
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| 175 | run_program_and_log_output(command, TRUE);
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| 176 | }
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| 177 | paranoid_free(command);
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| 178 | paranoid_free(tmp);
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| 179 | }
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[1] | 180 |
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| 181 |
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| 182 | /**
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| 183 | * Handler for SIGPIPE.
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| 184 | * @param sig The signal that occurred (hopefully SIGPIPE).
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| 185 | */
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| 186 | void sigpipe_occurred(int sig)
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| 187 | {
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[42] | 188 | g_sigpipe = TRUE;
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[1] | 189 | }
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| 190 |
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| 191 | /* @} - end of fifoGroup */
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| 192 |
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[42] | 193 | /* BERLIOS: useless ?
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[1] | 194 | int
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| 195 | extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
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| 196 | char *ramdisk_fname,
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| 197 | char *output_cfg_file,
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| 198 | char *output_mountlist_file);
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[42] | 199 | */
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