source: branches/3.2/mondo/src/common/libmondo-fifo.c @ 3191

Last change on this file since 3191 was 3191, checked in by bruno, 6 years ago
  • Lots of memory management backports from 3.1 to 3.2 - still not finished, nor working ATM. the common subdir was done during travel, so this is essentially a backup !
  • Property svn:keywords set to Id
File size: 4.3 KB
Line 
1/*
2   $Id: libmondo-fifo.c 3191 2013-09-25 06:55:45Z 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 "mr_mem.h"
24#include "mondostructures.h"
25#include "libmondo.h"
26
27/**
28 * @addtogroup globalGroup
29 * @{
30 */
31/**
32 * The SIGPIPE handler sets this to TRUE.
33 */
34bool g_sigpipe = FALSE;
35
36/**
37 * PID of the "main" process.
38 */
39pid_t g_mastermind_pid = 0;
40
41
42
43/**
44 * Command line with which @c buffer was invoked.
45 */
46char g_sz_call_to_buffer[MAX_STR_LEN];
47
48/**
49 * Size of the buffer used with @c buffer.
50 */
51int g_tape_buffer_size_MB = 0;
52
53/* @} - end of globalGroup */
54
55extern char *ps_options;
56extern char *ps_proc_id;
57extern char *MONDO_LOGFILE;
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 keych;
74    char *sz_dir = NULL;
75    char *tmp = NULL;
76    char *command = NULL;
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    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
86    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
87    sync();
88    for (bufsize = wise_upper_limit, res = -1;
89         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
90        mr_asprintf(tmp,"dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c", internal_tape_block_size, bufsize, 'm');
91        res = run_program_and_log_output(tmp, 2);
92        mr_free(tmp);
93    }
94    if (!res) {
95        bufsize++;
96        log_to_screen(tmp, "Negotiated max buffer of %d MB ", bufsize);
97    } else {
98        bufsize = 0;
99        res = 0;
100        log_to_screen
101            ("Cannot negotiate a buffer of ANY size. Using dd instead.");
102    }
103    if (direction == 'r') {
104        keych = 'i';
105    } else {
106        keych = 'o';
107    }
108    if (bufsize) {
109        sprintf(g_sz_call_to_buffer,
110                "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
111                (direction == 'r') ? 20 : 75, internal_tape_block_size,
112                keych, device, MONDO_LOGFILE);
113    } else {
114        sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
115                internal_tape_block_size, keych, device);
116    }
117    log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
118    mr_asprintf(sz_dir, "%c", direction);
119    fres = popen(g_sz_call_to_buffer, sz_dir);
120    mr_free(sz_dir);
121
122    if (fres) {
123        log_msg(2, "Successfully opened ('%c') tape device %s", direction,
124                device);
125    } else {
126        log_msg(2, "Failed to open ('%c') tape device %s", direction,
127                device);
128    }
129    sleep(2);
130    mr_asprintf(tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
131    if (run_program_and_log_output(tmp, 2)) {
132        log_msg(2, "Warning - I think I failed to open tape, actually.");
133    }
134    mr_free(tmp);
135    g_tape_buffer_size_MB = bufsize;
136    mr_asprintf(command, "ps %s | grep buffer | grep -v grep", ps_options);
137    if (run_program_and_log_output(command, 1)) {
138        fres = NULL;
139        log_to_screen("Failed to open tape streamer. Buffer error.");
140    } else {
141        log_to_screen("Buffer successfully started.");
142    }
143    mr_free(command);
144
145    return (fres);
146}
147
148
149/**
150 * Kill @c buffer processes.
151 * Only called in mondoarchive
152 */
153void kill_buffer()
154{
155    char *tmp = NULL;
156    char *command = NULL;
157
158    if (g_sz_call_to_buffer == NULL) {
159        return;
160    }
161    if (strcmp(g_sz_call_to_buffer,"") == 0) {
162        return;
163    }
164    sync();
165    mr_asprintf(command, "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
166    log_msg(2, "kill_buffer() --- command = %s", command);
167    mr_asprintf(tmp, "%s", call_program_and_get_last_line_of_output(command));
168    mr_free(command);
169
170    mr_asprintf(command, "kill %s", tmp);
171    log_msg(2, "kill_buffer() --- command = %s", command);
172    if (strlen(tmp) > 0) {
173        run_program_and_log_output(command, TRUE);
174    }
175    mr_free(tmp);
176    mr_free(command);
177}
178
179
180
181
182
183/**
184 * Handler for SIGPIPE.
185 * @param sig The signal that occurred (hopefully SIGPIPE).
186 */
187void sigpipe_occurred(int sig)
188{
189    g_sigpipe = TRUE;
190}
191
192/* @} - end of fifoGroup */
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