source: trunk/mondo/mondo/common/libmondo-fifo.c @ 808

Last change on this file since 808 was 808, checked in by bruno, 13 years ago

merge -r793:807 $SVN_M/branches/stable
src => common for the moment it's easier to manage merges

  • Property svn:keywords set to Id
File size: 4.5 KB
Line 
1/* $Id: libmondo-fifo.c 808 2006-09-22 21:12:37Z bruno $ */
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
57extern char *ps_options;
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    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 %s | grep \"%s\"", ps_options, 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    asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
139    if (run_program_and_log_output(tmp, 1)) {
140        fres = NULL;
141        log_to_screen(_("Failed to open tape streamer. Buffer error."));
142    } else {
143        log_to_screen(_("Buffer successfully started."));
144    }
145    paranoid_free(tmp);
146    return (fres);
147}
148
149
150/**
151 * Kill @c buffer processes.
152 */
153void kill_buffer()
154{
155    char *tmp;
156    char *command;
157
158    sync();
159    asprintf(&command,
160            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $1;}' | grep -v PID | tr -s '\n' ' ' | awk '{ print $1; }'", ps_options,
161            g_sz_call_to_buffer);
162    paranoid_free(g_sz_call_to_buffer);
163    log_msg(2, "kill_buffer() --- command = %s", command);
164
165    tmp = call_program_and_get_last_line_of_output(command);
166    paranoid_free(command);
167
168    asprintf(&command, "kill %s", tmp);
169    log_msg(2, "kill_buffer() --- command = %s", command);
170
171    if (strlen(tmp) > 0) {
172        run_program_and_log_output(command, TRUE);
173    }
174    paranoid_free(tmp);
175    paranoid_free(command);
176}
177
178
179/**
180 * Handler for SIGPIPE.
181 * @param sig The signal that occurred (hopefully SIGPIPE).
182 */
183void sigpipe_occurred(int sig)
184{
185    g_sigpipe = TRUE;
186}
187
188/* @} - end of fifoGroup */
189
190/* BERLIOS: useless ?
191int
192extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
193                  char *ramdisk_fname,
194                  char *output_cfg_file,
195                  char *output_mountlist_file);
196*/
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