source: trunk/mondo/src/common/libmondo-fifo.c @ 1079

Last change on this file since 1079 was 1079, checked in by Bruno Cornec, 13 years ago

merge -r1045:1078 £SVN_M/branches/stable

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1/* $Id: libmondo-fifo.c 1079 2007-01-28 16:58:18Z bruno $ */
2/**
3 * @file
4 * Functions to handle buffering of tape archives as they are read/written.
5 * This used the external program @c buffer mostly.
6 */
7
8#include <unistd.h>
9#include <stdio.h>
10#ifndef S_SPLINT_S
11#include <signal.h>
12#endif
13#include <fcntl.h>
14
15#include <errno.h>
16#include <sys/types.h>
17#include <sys/stat.h>
18#include <sys/ipc.h>
19#include <sys/shm.h>
20#include <sys/sem.h>
21#include <sys/wait.h>
22#ifndef S_SPLINT_S
23#include <pthread.h>
24#endif
25
26#include "my-stuff.h"
27#include "mondostructures.h"
28#include "libmondo.h"
29#include "mr_mem.h"
30
31/**
32 * @addtogroup globalGroup
33 * @{
34 */
35/**
36 * The SIGPIPE handler sets this to TRUE.
37 */
38bool g_sigpipe = FALSE;
39
40/**
41 * PID of the "main" process.
42 */
43pid_t g_mastermind_pid = 0;
44
45/**
46 * Command line with which @c buffer was invoked.
47 */
48char *g_sz_call_to_buffer;
49
50/**
51 * Size of the buffer used with @c buffer.
52 */
53int g_tape_buffer_size_MB = 0;
54
55/* @} - end of globalGroup */
56
57extern char *ps_options;
58extern char *ps_proc_id;
59
60/**
61 * @addtogroup fifoGroup
62 * @{
63 */
64/**
65 * Open a pipe to/from @c buffer.
66 * If buffer does not work at all, we use `dd'.
67 * @param device The device to read from/write to.
68 * @param direction @c 'r' (reading) or @c 'w' (writing).
69 * @return A file pointer to/from the @c buffer process.
70 */
71FILE *open_device_via_buffer(char *device, char direction,
72                             long internal_tape_block_size)
73{
74    char *sz_dir;
75    char keych;
76    char *tmp;
77    FILE *fres;
78    int bufsize;                // in megabytes
79    int res;
80    int wise_upper_limit;
81    int wise_lower_limit;
82
83    assert_string_is_neither_NULL_nor_zerolength(device);
84    assert(direction == 'w' || direction == 'r');
85    mr_asprintf(&sz_dir, "%c", direction);
86    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
87    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
88    sync();
89    for (bufsize = wise_upper_limit, res = -1;
90         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
91        mr_asprintf(&tmp,
92                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
93                 internal_tape_block_size, bufsize, 'm');
94        res = run_program_and_log_output(tmp, 2);
95        mr_free(tmp);
96    }
97    if (!res) {
98        bufsize++;
99        mr_asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
100        log_to_screen(tmp);
101        mr_free(tmp);
102    } else {
103        bufsize = 0;
104        res = 0;
105        log_to_screen
106            (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
107    }
108    if (direction == 'r') {
109        keych = 'i';
110    } else {
111        keych = 'o';
112    }
113    if (bufsize) {
114        mr_asprintf(&g_sz_call_to_buffer,
115                 "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize,
116                 'm', (direction == 'r') ? 20 : 75,
117                 internal_tape_block_size, keych, device, MONDO_LOGFILE);
118    } else {
119        mr_asprintf(&g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
120                 internal_tape_block_size, keych, device);
121    }
122    log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
123    fres = popen(g_sz_call_to_buffer, sz_dir);
124    mr_free(sz_dir);
125    if (fres) {
126        log_msg(2, "Successfully opened ('%c') tape device %s", direction,
127                device);
128    } else {
129        log_msg(2, "Failed to open ('%c') tape device %s", direction,
130                device);
131    }
132    sleep(2);
133    mr_asprintf(&tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
134    if (run_program_and_log_output(tmp, 2)) {
135        log_msg(2, "Warning - I think I failed to open tape, actually.");
136    }
137    mr_free(tmp);
138    g_tape_buffer_size_MB = bufsize;
139    mr_asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
140    if (run_program_and_log_output(tmp, 1)) {
141        fres = NULL;
142        log_to_screen(_("Failed to open tape streamer. Buffer error."));
143    } else {
144        log_to_screen(_("Buffer successfully started."));
145    }
146    mr_free(tmp);
147    return (fres);
148}
149
150
151/**
152 * Kill @c buffer processes.
153 * Only called in mondoarchive
154 */
155void kill_buffer()
156{
157    char *tmp;
158    char *command;
159
160    sync();
161    if (g_sz_call_to_buffer == NULL) {
162        return;
163    }
164    if (strcmp(g_sz_call_to_buffer,"") == 0) {
165        return;
166    }
167    mr_asprintf(&command,
168            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
169    mr_free(g_sz_call_to_buffer);
170    log_msg(2, "kill_buffer() --- command = %s", command);
171
172    tmp = call_program_and_get_last_line_of_output(command);
173    mr_free(command);
174
175    mr_asprintf(&command, "kill %s", tmp);
176    log_msg(2, "kill_buffer() --- command = %s", command);
177
178    if (strlen(tmp) > 0) {
179        run_program_and_log_output(command, TRUE);
180    }
181    mr_free(tmp);
182    mr_free(command);
183}
184
185
186/**
187 * Handler for SIGPIPE.
188 * @param sig The signal that occurred (hopefully SIGPIPE).
189 */
190void sigpipe_occurred(int sig)
191{
192    g_sigpipe = TRUE;
193}
194
195/* @} - end of fifoGroup */
196
197/* BERLIOS: useless ?
198int
199extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
200                  char *ramdisk_fname,
201                  char *output_cfg_file,
202                  char *output_mountlist_file);
203*/
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