source: MondoRescue/branches/stable/mondo/src/common/libmondo-fifo.c@ 1344

Last change on this file since 1344 was 1344, checked in by Bruno Cornec, 17 years ago

Logfile management in mondo (partly)

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File size: 4.7 KB
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[1]1/* libmondo-fifo.c
[128]2 $Id: libmondo-fifo.c 1344 2007-04-24 22:40:29Z bruno $
[1]3*/
4
5/**
6 * @file
7 * Functions to handle buffering of tape archives as they are read/written.
8 * This used the external program @c buffer mostly.
9 */
10
11#include <unistd.h>
12#include <stdio.h>
[1109]13#ifndef S_SPLINT_S
[1]14#include <signal.h>
[1109]15#endif
[128]16#include <fcntl.h>
17
[1]18#include <errno.h>
19#include <sys/types.h>
20#include <sys/stat.h>
21#include <sys/ipc.h>
22#include <sys/shm.h>
23#include <sys/sem.h>
24#include <sys/wait.h>
[1109]25#ifndef S_SPLINT_S
[1]26#include <pthread.h>
[1109]27#endif
[1]28
29#include "my-stuff.h"
30#include "mondostructures.h"
31#include "libmondo.h"
[1109]32#include "mr_mem.h"
[1123]33#include "mr_msg.h"
[1]34
35/**
36 * @addtogroup globalGroup
37 * @{
38 */
39/**
40 * The SIGPIPE handler sets this to TRUE.
41 */
[128]42bool g_sigpipe = FALSE;
[1]43
44/**
45 * PID of the "main" process.
46 */
[128]47pid_t g_mastermind_pid = 0;
[1]48
49/**
50 * Command line with which @c buffer was invoked.
51 */
52char g_sz_call_to_buffer[MAX_STR_LEN];
53
54/**
55 * Size of the buffer used with @c buffer.
56 */
[128]57int g_tape_buffer_size_MB = 0;
[1]58
59/* @} - end of globalGroup */
60
[792]61extern char *ps_options;
[928]62extern char *ps_proc_id;
[1344]63extern char *MONDO_LOGFILE;
[1]64
65/**
66 * @addtogroup fifoGroup
67 * @{
68 */
69/**
70 * Open a pipe to/from @c buffer.
71 * If buffer does not work at all, we use `dd'.
72 * @param device The device to read from/write to.
73 * @param direction @c 'r' (reading) or @c 'w' (writing).
74 * @return A file pointer to/from the @c buffer process.
75 */
[128]76FILE *open_device_via_buffer(char *device, char direction,
77 long internal_tape_block_size)
[1]78{
[1109]79 char *sz_dir;
[128]80 char keych;
81 char *tmp;
82 FILE *fres;
83 int bufsize; // in megabytes
84 int res;
85 int wise_upper_limit;
86 int wise_lower_limit;
[1]87
[128]88 assert_string_is_neither_NULL_nor_zerolength(device);
89 assert(direction == 'w' || direction == 'r');
[1109]90 mr_asprintf(&sz_dir, "%c", direction);
[128]91 wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
92 wise_lower_limit = 1; // wise_upper_limit/2 + 1;
[1109]93 sync();
[128]94 for (bufsize = wise_upper_limit, res = -1;
95 res != 0 && bufsize >= wise_lower_limit; bufsize--) {
[1109]96 mr_asprintf(&tmp,
97 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
98 internal_tape_block_size, bufsize, 'm');
[128]99 res = run_program_and_log_output(tmp, 2);
[1109]100 mr_free(tmp);
[128]101 }
102 if (!res) {
103 bufsize++;
[1109]104 mr_asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
[128]105 log_to_screen(tmp);
[1109]106 mr_free(tmp);
[128]107 } else {
108 bufsize = 0;
109 res = 0;
110 log_to_screen
[1109]111 (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
[128]112 }
113 if (direction == 'r') {
114 keych = 'i';
115 } else {
116 keych = 'o';
117 }
118 if (bufsize) {
119 sprintf(g_sz_call_to_buffer,
120 "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
121 (direction == 'r') ? 20 : 75, internal_tape_block_size,
122 keych, device, MONDO_LOGFILE);
123 } else {
124 sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
125 internal_tape_block_size, keych, device);
126 }
[1107]127 mr_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
[128]128 fres = popen(g_sz_call_to_buffer, sz_dir);
[1109]129 mr_free(sz_dir);
[128]130 if (fres) {
[1107]131 mr_msg(2, "Successfully opened ('%c') tape device %s", direction,
[128]132 device);
133 } else {
[1107]134 mr_msg(2, "Failed to open ('%c') tape device %s", direction,
[128]135 device);
136 }
137 sleep(2);
[1109]138 mr_asprintf(&tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
[128]139 if (run_program_and_log_output(tmp, 2)) {
[1107]140 mr_msg(2, "Warning - I think I failed to open tape, actually.");
[128]141 }
[1109]142 mr_free(tmp);
[128]143 g_tape_buffer_size_MB = bufsize;
[1109]144 mr_asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
145 if (run_program_and_log_output(tmp, 1)) {
[128]146 fres = NULL;
[1109]147 log_to_screen(_("Failed to open tape streamer. Buffer error."));
[128]148 } else {
[1109]149 log_to_screen(_("Buffer successfully started."));
[128]150 }
[1080]151 mr_free(tmp);
[128]152 return (fres);
[1]153}
154
155
156/**
157 * Kill @c buffer processes.
[928]158 * Only called in mondoarchive
[1]159 */
160void kill_buffer()
161{
[1157]162 char *tmp = NULL;
163 char *command = NULL;
[1]164
[1109]165 sync();
[941]166 if (g_sz_call_to_buffer == NULL) {
167 return;
168 }
169 if (strcmp(g_sz_call_to_buffer,"") == 0) {
170 return;
171 }
[1109]172 mr_asprintf(&command,
[941]173 "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
[1107]174 mr_msg(2, "kill_buffer() --- command = %s", command);
[1157]175 mr_asprintf(&tmp, call_program_and_get_last_line_of_output(command));
[1109]176 mr_free(command);
177
178 mr_asprintf(&command, "kill %s", tmp);
[1107]179 mr_msg(2, "kill_buffer() --- command = %s", command);
[128]180 if (strlen(tmp) > 0) {
181 run_program_and_log_output(command, TRUE);
182 }
[1080]183 mr_free(tmp);
184 mr_free(command);
[1]185}
186
187
188/**
189 * Handler for SIGPIPE.
190 * @param sig The signal that occurred (hopefully SIGPIPE).
191 */
192void sigpipe_occurred(int sig)
193{
[128]194 g_sigpipe = TRUE;
[1]195}
196
197/* @} - end of fifoGroup */
198
[1109]199/* BERLIOS: useless ?
200int
201extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
202 char *ramdisk_fname,
203 char *output_cfg_file,
204 char *output_mountlist_file);
205*/
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