source: branches/stable/mondo/src/common/libmondo-fifo.c @ 1543

Last change on this file since 1543 was 1543, checked in by Bruno Cornec, 13 years ago

mr_gettext.h added where necessary
mr_conf is now a pointer on a struct aveywhere

  • Property svn:keywords set to Id
File size: 4.7 KB
Line 
1/* libmondo-fifo.c
2   $Id: libmondo-fifo.c 1543 2007-07-22 23:05:36Z 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#ifndef S_SPLINT_S
14#include <signal.h>
15#endif
16#include <fcntl.h>
17
18#include <errno.h>
19#include <sys/types.h>
20#include <sys/stat.h>
21#include <sys/ipc.h>
22#include <sys/shm.h>
23#include <sys/sem.h>
24#include <sys/wait.h>
25#ifndef S_SPLINT_S
26#include <pthread.h>
27#endif
28
29#include "my-stuff.h"
30#include "mondostructures.h"
31#include "libmondo.h"
32#include "mr_mem.h"
33#include "mr_msg.h"
34#include "mr_gettext.h"
35
36/**
37 * @addtogroup globalGroup
38 * @{
39 */
40/**
41 * The SIGPIPE handler sets this to TRUE.
42 */
43bool g_sigpipe = FALSE;
44
45/**
46 * PID of the "main" process.
47 */
48pid_t g_mastermind_pid = 0;
49
50/**
51 * Command line with which @c buffer was invoked.
52 */
53char g_sz_call_to_buffer[MAX_STR_LEN];
54
55/**
56 * Size of the buffer used with @c buffer.
57 */
58int g_tape_buffer_size_MB = 0;
59
60/* @} - end of globalGroup */
61
62extern char *ps_options;
63extern char *ps_proc_id;
64extern char *MONDO_LOGFILE;
65
66/**
67 * @addtogroup fifoGroup
68 * @{
69 */
70/**
71 * Open a pipe to/from @c buffer.
72 * If buffer does not work at all, we use `dd'.
73 * @param device The device to read from/write to.
74 * @param direction @c 'r' (reading) or @c 'w' (writing).
75 * @return A file pointer to/from the @c buffer process.
76 */
77FILE *open_device_via_buffer(char *device, char direction,
78                             long internal_tape_block_size)
79{
80    char *sz_dir;
81    char keych;
82    char *tmp;
83    FILE *fres;
84    int bufsize;                // in megabytes
85    int res;
86    int wise_upper_limit;
87    int wise_lower_limit;
88
89    assert_string_is_neither_NULL_nor_zerolength(device);
90    assert(direction == 'w' || direction == 'r');
91    mr_asprintf(&sz_dir, "%c", direction);
92    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
93    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
94    sync();
95    for (bufsize = wise_upper_limit, res = -1;
96         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
97        mr_asprintf(&tmp,
98                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
99                 internal_tape_block_size, bufsize, 'm');
100        res = run_program_and_log_output(tmp, 2);
101        mr_free(tmp);
102    }
103    if (!res) {
104        bufsize++;
105        mr_asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
106        log_to_screen(tmp);
107        mr_free(tmp);
108    } else {
109        bufsize = 0;
110        res = 0;
111        log_to_screen
112            (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
113    }
114    if (direction == 'r') {
115        keych = 'i';
116    } else {
117        keych = 'o';
118    }
119    if (bufsize) {
120        sprintf(g_sz_call_to_buffer,
121                "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
122                (direction == 'r') ? 20 : 75, internal_tape_block_size,
123                keych, device, MONDO_LOGFILE);
124    } else {
125        sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
126                internal_tape_block_size, keych, device);
127    }
128    mr_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
129    fres = popen(g_sz_call_to_buffer, sz_dir);
130    mr_free(sz_dir);
131    if (fres) {
132        mr_msg(2, "Successfully opened ('%c') tape device %s", direction,
133                device);
134    } else {
135        mr_msg(2, "Failed to open ('%c') tape device %s", direction,
136                device);
137    }
138    sleep(2);
139    mr_asprintf(&tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
140    if (run_program_and_log_output(tmp, 2)) {
141        mr_msg(2, "Warning - I think I failed to open tape, actually.");
142    }
143    mr_free(tmp);
144    g_tape_buffer_size_MB = bufsize;
145    mr_asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
146    if (run_program_and_log_output(tmp, 1)) {
147        fres = NULL;
148        log_to_screen(_("Failed to open tape streamer. Buffer error."));
149    } else {
150        log_to_screen(_("Buffer successfully started."));
151    }
152    mr_free(tmp);
153    return (fres);
154}
155
156
157/**
158 * Kill @c buffer processes.
159 * Only called in mondoarchive
160 */
161void kill_buffer()
162{
163    char *tmp = NULL;
164    char *command = NULL;
165
166    sync();
167    if (g_sz_call_to_buffer == NULL) {
168        return;
169    }
170    if (strcmp(g_sz_call_to_buffer,"") == 0) {
171        return;
172    }
173    mr_asprintf(&command,
174            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
175    mr_msg(2, "kill_buffer() --- command = %s", command);
176    mr_asprintf(&tmp, call_program_and_get_last_line_of_output(command));
177    mr_free(command);
178
179    mr_asprintf(&command, "kill %s", tmp);
180    mr_msg(2, "kill_buffer() --- command = %s", command);
181    if (strlen(tmp) > 0) {
182        run_program_and_log_output(command, TRUE);
183    }
184    mr_free(tmp);
185    mr_free(command);
186}
187
188
189/**
190 * Handler for SIGPIPE.
191 * @param sig The signal that occurred (hopefully SIGPIPE).
192 */
193void sigpipe_occurred(int sig)
194{
195    g_sigpipe = TRUE;
196}
197
198/* @} - end of fifoGroup */
199
200/* BERLIOS: useless ?
201int
202extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
203                  char *ramdisk_fname,
204                  char *output_cfg_file,
205                  char *output_mountlist_file);
206*/
Note: See TracBrowser for help on using the repository browser.