source: trunk/mondo/mondo/common/libmondo-fifo.c @ 507

Last change on this file since 507 was 507, checked in by bcornec, 13 years ago

merge -r489:506 $SVN_M/branches/stable

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1/* $Id: libmondo-fifo.c 507 2006-04-30 00:04:16Z bcornec $ */
2
3/**
4 * @file
5 * Functions to handle buffering of tape archives as they are read/written.
6 * This used the external program @c buffer mostly.
7 */
8
9#include <unistd.h>
10#include <stdio.h>
11#ifndef S_SPLINT_S
12#include <signal.h>
13#endif
14#include <fcntl.h>
15#include <stdio.h>
16
17#include <errno.h>
18#include <sys/types.h>
19#include <sys/stat.h>
20#include <sys/ipc.h>
21#include <sys/shm.h>
22#include <sys/sem.h>
23#include <sys/wait.h>
24#ifndef S_SPLINT_S
25#include <pthread.h>
26#endif
27
28#include "my-stuff.h"
29#include "mondostructures.h"
30#include "libmondo.h"
31
32/**
33 * @addtogroup globalGroup
34 * @{
35 */
36/**
37 * The SIGPIPE handler sets this to TRUE.
38 */
39bool g_sigpipe = FALSE;
40
41/**
42 * PID of the "main" process.
43 */
44pid_t g_mastermind_pid = 0;
45
46/**
47 * Command line with which @c buffer was invoked.
48 */
49char *g_sz_call_to_buffer;
50
51/**
52 * Size of the buffer used with @c buffer.
53 */
54int g_tape_buffer_size_MB = 0;
55
56/* @} - end of globalGroup */
57
58
59/**
60 * @addtogroup fifoGroup
61 * @{
62 */
63/**
64 * Open a pipe to/from @c buffer.
65 * If buffer does not work at all, we use `dd'.
66 * @param device The device to read from/write to.
67 * @param direction @c 'r' (reading) or @c 'w' (writing).
68 * @return A file pointer to/from the @c buffer process.
69 */
70FILE *open_device_via_buffer(char *device, char direction,
71                             long internal_tape_block_size)
72{
73    char *sz_dir;
74    char keych;
75    char *tmp;
76    FILE *fres;
77    int bufsize;                // in megabytes
78    int res;
79    int wise_upper_limit;
80    int wise_lower_limit;
81
82    assert_string_is_neither_NULL_nor_zerolength(device);
83    assert(direction == 'w' || direction == 'r');
84    asprintf(&sz_dir, "%c", direction);
85    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
86    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
87    paranoid_system("sync");
88    for (bufsize = wise_upper_limit, res = -1;
89         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
90        asprintf(&tmp,
91                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
92                 internal_tape_block_size, bufsize, 'm');
93        res = run_program_and_log_output(tmp, 2);
94        paranoid_free(tmp);
95    }
96    if (!res) {
97        bufsize++;
98        asprintf(&tmp, _("Negotiated max buffer of %d MB ", bufsize));
99        log_to_screen(tmp);
100        paranoid_free(tmp);
101    } else {
102        bufsize = 0;
103        res = 0;
104        log_to_screen
105            (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
106    }
107    if (direction == 'r') {
108        keych = 'i';
109    } else {
110        keych = 'o';
111    }
112    if (bufsize) {
113        asprintf(&g_sz_call_to_buffer,
114                 "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize,
115                 'm', (direction == 'r') ? 20 : 75,
116                 internal_tape_block_size, keych, device, MONDO_LOGFILE);
117    } else {
118        asprintf(&g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
119                 internal_tape_block_size, keych, device);
120    }
121    log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
122    fres = popen(g_sz_call_to_buffer, sz_dir);
123    paranoid_free(sz_dir);
124    if (fres) {
125        log_msg(2, "Successfully opened ('%c') tape device %s", direction,
126                device);
127    } else {
128        log_msg(2, "Failed to open ('%c') tape device %s", direction,
129                device);
130    }
131    sleep(2);
132    asprintf(&tmp, "ps wwax | grep \"%s\"", g_sz_call_to_buffer);
133    if (run_program_and_log_output(tmp, 2)) {
134        log_msg(2, "Warning - I think I failed to open tape, actually.");
135    }
136    paranoid_free(tmp);
137    g_tape_buffer_size_MB = bufsize;
138    /* BERLIOS: usless ?
139       strcmp(tmp, g_sz_call_to_buffer);
140       tmp[30] = '\0';
141     */
142    asprintf(&tmp, "ps wwax | grep buffer | grep -v grep");
143    if (run_program_and_log_output(tmp, 1)) {
144        fres = NULL;
145        log_to_screen(_("Failed to open tape streamer. Buffer error."));
146    } else {
147        log_to_screen(_("Buffer successfully started."));
148    }
149    paranoid_free(tmp);
150    return (fres);
151}
152
153
154/**
155 * Kill @c buffer processes.
156 */
157void kill_buffer()
158{
159    char *tmp;
160    char *command;
161
162    paranoid_system("sync");
163    asprintf(&command,
164             "ps wwax | fgrep \"%s\" | fgrep -v grep | awk '{print $1;}' | grep -v PID | tr -s '\n' ' ' | awk '{ print $1; }'",
165             g_sz_call_to_buffer);
166    paranoid_free(g_sz_call_to_buffer);
167    log_msg(2, "kill_buffer() --- command = %s", command);
168
169    asprintf(&tmp, "%s",
170             call_program_and_get_last_line_of_output(command));
171    paranoid_free(command);
172
173    asprintf(&command, "kill %s", tmp);
174    log_msg(2, "kill_buffer() --- command = %s", command);
175
176    if (strlen(tmp) > 0) {
177        run_program_and_log_output(command, TRUE);
178    }
179    paranoid_free(command);
180    paranoid_free(tmp);
181}
182
183
184/**
185 * Handler for SIGPIPE.
186 * @param sig The signal that occurred (hopefully SIGPIPE).
187 */
188void sigpipe_occurred(int sig)
189{
190    g_sigpipe = TRUE;
191}
192
193/* @} - end of fifoGroup */
194
195/* BERLIOS: useless ?
196int
197extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
198                  char *ramdisk_fname,
199                  char *output_cfg_file,
200                  char *output_mountlist_file);
201*/
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