[42] | 1 | /* $Id: libmondo-fifo.c 1161 2007-02-14 12:13:49Z bruno $ */
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[1] | 2 | /**
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| 3 | * @file
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| 4 | * Functions to handle buffering of tape archives as they are read/written.
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| 5 | * This used the external program @c buffer mostly.
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| 6 | */
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| 7 |
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| 8 | #include <unistd.h>
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| 9 | #include <stdio.h>
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[142] | 10 | #ifndef S_SPLINT_S
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[1] | 11 | #include <signal.h>
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[142] | 12 | #endif
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[42] | 13 | #include <fcntl.h>
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| 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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[142] | 22 | #ifndef S_SPLINT_S
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[1] | 23 | #include <pthread.h>
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[142] | 24 | #endif
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[1] | 25 |
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| 26 | #include "my-stuff.h"
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| 27 | #include "mondostructures.h"
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| 28 | #include "libmondo.h"
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[900] | 29 | #include "mr_mem.h"
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[1161] | 30 | #include "mr_msg.h"
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[1] | 31 |
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| 32 | /**
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| 33 | * @addtogroup globalGroup
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| 34 | * @{
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| 35 | */
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| 36 | /**
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| 37 | * The SIGPIPE handler sets this to TRUE.
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| 38 | */
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[42] | 39 | bool g_sigpipe = FALSE;
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[1] | 40 |
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| 41 | /**
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| 42 | * PID of the "main" process.
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| 43 | */
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[42] | 44 | pid_t g_mastermind_pid = 0;
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[1] | 45 |
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| 46 | /**
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| 47 | * Command line with which @c buffer was invoked.
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| 48 | */
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[42] | 49 | char *g_sz_call_to_buffer;
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[1] | 50 |
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| 51 | /**
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| 52 | * Size of the buffer used with @c buffer.
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| 53 | */
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[42] | 54 | int g_tape_buffer_size_MB = 0;
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[1] | 55 |
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| 56 | /* @} - end of globalGroup */
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| 57 |
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[794] | 58 | extern char *ps_options;
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[932] | 59 | extern char *ps_proc_id;
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[1] | 60 |
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| 61 | /**
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| 62 | * @addtogroup fifoGroup
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| 63 | * @{
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| 64 | */
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| 65 | /**
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| 66 | * Open a pipe to/from @c buffer.
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| 67 | * If buffer does not work at all, we use `dd'.
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| 68 | * @param device The device to read from/write to.
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| 69 | * @param direction @c 'r' (reading) or @c 'w' (writing).
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| 70 | * @return A file pointer to/from the @c buffer process.
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| 71 | */
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[42] | 72 | FILE *open_device_via_buffer(char *device, char direction,
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| 73 | long internal_tape_block_size)
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[1] | 74 | {
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[42] | 75 | char *sz_dir;
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| 76 | char keych;
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| 77 | char *tmp;
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| 78 | FILE *fres;
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| 79 | int bufsize; // in megabytes
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| 80 | int res;
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| 81 | int wise_upper_limit;
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| 82 | int wise_lower_limit;
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[1] | 83 |
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[42] | 84 | assert_string_is_neither_NULL_nor_zerolength(device);
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| 85 | assert(direction == 'w' || direction == 'r');
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[900] | 86 | mr_asprintf(&sz_dir, "%c", direction);
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[42] | 87 | wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
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| 88 | wise_lower_limit = 1; // wise_upper_limit/2 + 1;
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[688] | 89 | sync();
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[42] | 90 | for (bufsize = wise_upper_limit, res = -1;
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| 91 | res != 0 && bufsize >= wise_lower_limit; bufsize--) {
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[900] | 92 | mr_asprintf(&tmp,
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[42] | 93 | "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
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| 94 | internal_tape_block_size, bufsize, 'm');
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| 95 | res = run_program_and_log_output(tmp, 2);
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[900] | 96 | mr_free(tmp);
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[42] | 97 | }
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| 98 | if (!res) {
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| 99 | bufsize++;
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[900] | 100 | mr_asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
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[42] | 101 | log_to_screen(tmp);
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[900] | 102 | mr_free(tmp);
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[42] | 103 | } else {
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| 104 | bufsize = 0;
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| 105 | res = 0;
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| 106 | log_to_screen
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[507] | 107 | (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
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[42] | 108 | }
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| 109 | if (direction == 'r') {
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| 110 | keych = 'i';
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| 111 | } else {
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| 112 | keych = 'o';
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| 113 | }
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| 114 | if (bufsize) {
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[900] | 115 | mr_asprintf(&g_sz_call_to_buffer,
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[42] | 116 | "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize,
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| 117 | 'm', (direction == 'r') ? 20 : 75,
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| 118 | internal_tape_block_size, keych, device, MONDO_LOGFILE);
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| 119 | } else {
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[900] | 120 | mr_asprintf(&g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
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[42] | 121 | internal_tape_block_size, keych, device);
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| 122 | }
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[1086] | 123 | mr_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
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[42] | 124 | fres = popen(g_sz_call_to_buffer, sz_dir);
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[900] | 125 | mr_free(sz_dir);
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[42] | 126 | if (fres) {
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[1086] | 127 | mr_msg(2, "Successfully opened ('%c') tape device %s", direction,
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[42] | 128 | device);
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| 129 | } else {
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[1086] | 130 | mr_msg(2, "Failed to open ('%c') tape device %s", direction,
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[42] | 131 | device);
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| 132 | }
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| 133 | sleep(2);
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[900] | 134 | mr_asprintf(&tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
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[42] | 135 | if (run_program_and_log_output(tmp, 2)) {
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[1086] | 136 | mr_msg(2, "Warning - I think I failed to open tape, actually.");
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[42] | 137 | }
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[900] | 138 | mr_free(tmp);
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[42] | 139 | g_tape_buffer_size_MB = bufsize;
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[900] | 140 | mr_asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
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[42] | 141 | if (run_program_and_log_output(tmp, 1)) {
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| 142 | fres = NULL;
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[507] | 143 | log_to_screen(_("Failed to open tape streamer. Buffer error."));
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[42] | 144 | } else {
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[507] | 145 | log_to_screen(_("Buffer successfully started."));
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[42] | 146 | }
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[900] | 147 | mr_free(tmp);
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[42] | 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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[932] | 154 | * Only called in mondoarchive
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[1] | 155 | */
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| 156 | void kill_buffer()
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| 157 | {
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[1161] | 158 | char *tmp = NULL;
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| 159 | char *command = NULL;
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[1] | 160 |
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[688] | 161 | sync();
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[956] | 162 | if (g_sz_call_to_buffer == NULL) {
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| 163 | return;
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| 164 | }
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| 165 | if (strcmp(g_sz_call_to_buffer,"") == 0) {
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| 166 | return;
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| 167 | }
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[900] | 168 | mr_asprintf(&command,
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[956] | 169 | "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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[900] | 170 | mr_free(g_sz_call_to_buffer);
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[1086] | 171 | mr_msg(2, "kill_buffer() --- command = %s", command);
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[1] | 172 |
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[688] | 173 | tmp = call_program_and_get_last_line_of_output(command);
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[900] | 174 | mr_free(command);
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[1] | 175 |
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[900] | 176 | mr_asprintf(&command, "kill %s", tmp);
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[1086] | 177 | mr_msg(2, "kill_buffer() --- command = %s", command);
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[42] | 178 | if (strlen(tmp) > 0) {
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| 179 | run_program_and_log_output(command, TRUE);
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| 180 | }
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[900] | 181 | mr_free(tmp);
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| 182 | mr_free(command);
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[42] | 183 | }
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[1] | 184 |
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| 185 |
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| 186 | /**
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| 187 | * Handler for SIGPIPE.
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| 188 | * @param sig The signal that occurred (hopefully SIGPIPE).
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| 189 | */
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| 190 | void sigpipe_occurred(int sig)
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| 191 | {
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[42] | 192 | g_sigpipe = TRUE;
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[1] | 193 | }
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| 194 |
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| 195 | /* @} - end of fifoGroup */
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| 196 |
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[42] | 197 | /* BERLIOS: useless ?
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[1] | 198 | int
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| 199 | extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
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| 200 | char *ramdisk_fname,
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| 201 | char *output_cfg_file,
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| 202 | char *output_mountlist_file);
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[42] | 203 | */
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