source: branches/2.2.7/mondo/src/common/libmondo-fifo.c @ 2030

Last change on this file since 2030 was 2030, checked in by Bruno Cornec, 12 years ago
  • Fix #252
  • Improve OCFS2 support (ocfs2 is a SANE_FORMAT)
  • Property svn:keywords set to Id
File size: 4.5 KB
Line 
1/*
2   $Id: libmondo-fifo.c 2030 2008-10-02 23:50:44Z bruno $
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>
13#include <signal.h>
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
22#include "my-stuff.h"
23#include "mondostructures.h"
24#include "libmondo.h"
25
26/**
27 * @addtogroup globalGroup
28 * @{
29 */
30/**
31 * The SIGPIPE handler sets this to TRUE.
32 */
33bool g_sigpipe = FALSE;
34
35/**
36 * PID of the "main" process.
37 */
38pid_t g_mastermind_pid = 0;
39
40
41
42/**
43 * Command line with which @c buffer was invoked.
44 */
45char g_sz_call_to_buffer[MAX_STR_LEN];
46
47/**
48 * Size of the buffer used with @c buffer.
49 */
50int g_tape_buffer_size_MB = 0;
51
52/* @} - end of globalGroup */
53
54extern char *ps_options;
55extern char *ps_proc_id;
56extern char *MONDO_LOGFILE;
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[32];
73    char keych;
74    char *tmp;
75    char *command;
76    FILE *fres;
77    int bufsize;                // in megabytes
78    int res;
79    int wise_upper_limit;
80    int wise_lower_limit;
81
82    malloc_string(tmp);
83    malloc_string(command);
84    assert_string_is_neither_NULL_nor_zerolength(device);
85    assert(direction == 'w' || direction == 'r');
86    sprintf(sz_dir, "%c", direction);
87    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
88    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
89    paranoid_system("sync");
90    for (bufsize = wise_upper_limit, res = -1;
91         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
92        sprintf(tmp,
93                "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
94                internal_tape_block_size, bufsize, 'm');
95        res = run_program_and_log_output(tmp, 2);
96    }
97    if (!res) {
98        bufsize++;
99        sprintf(tmp, "Negotiated max buffer of %d MB ", bufsize);
100        log_to_screen(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        sprintf(g_sz_call_to_buffer,
114                "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
115                (direction == 'r') ? 20 : 75, internal_tape_block_size,
116                keych, device, MONDO_LOGFILE);
117    } else {
118        sprintf(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    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    sprintf(tmp, "ps %s | grep \"%s\"", ps_options, 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    g_tape_buffer_size_MB = bufsize;
136    tmp[30] = '\0';
137    sprintf(command, "ps %s | grep buffer | grep -v grep", ps_options);
138    if (run_program_and_log_output(command, 1)) {
139        fres = NULL;
140        log_to_screen("Failed to open tape streamer. Buffer error.");
141    } else {
142        log_to_screen("Buffer successfully started.");
143    }
144
145    paranoid_free(command);
146    paranoid_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    if (g_sz_call_to_buffer == NULL) {
161        return;
162    }
163    if (strcmp(g_sz_call_to_buffer,"") == 0) {
164        return;
165    }
166    malloc_string(tmp);
167    malloc_string(command);
168    paranoid_system("sync");
169    sprintf(command,
170            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
171    log_msg(2, "kill_buffer() --- command = %s", command);
172    strcpy(tmp, call_program_and_get_last_line_of_output(command));
173    sprintf(command, "kill %s", tmp);
174    log_msg(2, "kill_buffer() --- command = %s", command);
175    if (strlen(tmp) > 0) {
176        run_program_and_log_output(command, TRUE);
177    }
178    paranoid_free(tmp);
179    paranoid_free(command);
180}
181
182
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
197int
198extract_config_file_from_ramdisk(char *ramdisk_fname,
199                                 char *output_cfg_file,
200                                 char *output_mountlist_file);
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