source: trunk/mondo/mondo/common/libmondo-fifo.c @ 688

Last change on this file since 688 was 688, checked in by bcornec, 13 years ago

Huge memory management patch.
Still not finished but a lot as been done.
What remains is around some functions returning strings, and some structure members.
(Could not finish due to laptop failure !)

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File size: 4.5 KB
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1/* $Id: libmondo-fifo.c 688 2006-07-17 13:44:46Z 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
16#include <errno.h>
17#include <sys/types.h>
18#include <sys/stat.h>
19#include <sys/ipc.h>
20#include <sys/shm.h>
21#include <sys/sem.h>
22#include <sys/wait.h>
23#ifndef S_SPLINT_S
24#include <pthread.h>
25#endif
26
27#include "my-stuff.h"
28#include "mondostructures.h"
29#include "libmondo.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
57
58/**
59 * @addtogroup fifoGroup
60 * @{
61 */
62/**
63 * Open a pipe to/from @c buffer.
64 * If buffer does not work at all, we use `dd'.
65 * @param device The device to read from/write to.
66 * @param direction @c 'r' (reading) or @c 'w' (writing).
67 * @return A file pointer to/from the @c buffer process.
68 */
69FILE *open_device_via_buffer(char *device, char direction,
70                             long internal_tape_block_size)
71{
72    char *sz_dir;
73    char keych;
74    char *tmp;
75    FILE *fres;
76    int bufsize;                // in megabytes
77    int res;
78    int wise_upper_limit;
79    int wise_lower_limit;
80
81    assert_string_is_neither_NULL_nor_zerolength(device);
82    assert(direction == 'w' || direction == 'r');
83    asprintf(&sz_dir, "%c", direction);
84    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
85    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
86    sync();
87    for (bufsize = wise_upper_limit, res = -1;
88         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
89        asprintf(&tmp,
90                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
91                 internal_tape_block_size, bufsize, 'm');
92        res = run_program_and_log_output(tmp, 2);
93        paranoid_free(tmp);
94    }
95    if (!res) {
96        bufsize++;
97        asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
98        log_to_screen(tmp);
99        paranoid_free(tmp);
100    } else {
101        bufsize = 0;
102        res = 0;
103        log_to_screen
104            (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
105    }
106    if (direction == 'r') {
107        keych = 'i';
108    } else {
109        keych = 'o';
110    }
111    if (bufsize) {
112        asprintf(&g_sz_call_to_buffer,
113                 "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize,
114                 'm', (direction == 'r') ? 20 : 75,
115                 internal_tape_block_size, keych, device, MONDO_LOGFILE);
116    } else {
117        asprintf(&g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
118                 internal_tape_block_size, keych, device);
119    }
120    log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
121    fres = popen(g_sz_call_to_buffer, sz_dir);
122    paranoid_free(sz_dir);
123    if (fres) {
124        log_msg(2, "Successfully opened ('%c') tape device %s", direction,
125                device);
126    } else {
127        log_msg(2, "Failed to open ('%c') tape device %s", direction,
128                device);
129    }
130    sleep(2);
131    asprintf(&tmp, "ps wwax | grep \"%s\"", g_sz_call_to_buffer);
132    if (run_program_and_log_output(tmp, 2)) {
133        log_msg(2, "Warning - I think I failed to open tape, actually.");
134    }
135    paranoid_free(tmp);
136    g_tape_buffer_size_MB = bufsize;
137    /* BERLIOS: usless ?
138       strcmp(tmp, g_sz_call_to_buffer);
139       tmp[30] = '\0';
140     */
141    asprintf(&tmp, "ps wwax | grep buffer | grep -v grep");
142    if (run_program_and_log_output(tmp, 1)) {
143        fres = NULL;
144        log_to_screen(_("Failed to open tape streamer. Buffer error."));
145    } else {
146        log_to_screen(_("Buffer successfully started."));
147    }
148    paranoid_free(tmp);
149    return (fres);
150}
151
152
153/**
154 * Kill @c buffer processes.
155 */
156void kill_buffer()
157{
158    char *tmp;
159    char *command;
160
161    sync();
162    asprintf(&command,
163            "ps wwax | grep -F \"%s\" | grep -Fv grep | awk '{print $1;}' | grep -v PID | tr -s '\n' ' ' | awk '{ print $1; }'",
164            g_sz_call_to_buffer);
165    paranoid_free(g_sz_call_to_buffer);
166    log_msg(2, "kill_buffer() --- command = %s", command);
167
168    tmp = call_program_and_get_last_line_of_output(command);
169    paranoid_free(command);
170
171    asprintf(&command, "kill %s", tmp);
172    log_msg(2, "kill_buffer() --- command = %s", command);
173
174    if (strlen(tmp) > 0) {
175        run_program_and_log_output(command, TRUE);
176    }
177    paranoid_free(tmp);
178    paranoid_free(command);
179}
180
181
182/**
183 * Handler for SIGPIPE.
184 * @param sig The signal that occurred (hopefully SIGPIPE).
185 */
186void sigpipe_occurred(int sig)
187{
188    g_sigpipe = TRUE;
189}
190
191/* @} - end of fifoGroup */
192
193/* BERLIOS: useless ?
194int
195extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
196                  char *ramdisk_fname,
197                  char *output_cfg_file,
198                  char *output_mountlist_file);
199*/
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