source: branches/stable/mondo/src/common/libmondo-fifo.c @ 1109

Last change on this file since 1109 was 1109, checked in by bruno, 13 years ago

Improve memory management for libmondo-fifo.c (trunk merge begining)

  • Property svn:keywords set to Id
File size: 4.6 KB
Line 
1/* libmondo-fifo.c
2   $Id: libmondo-fifo.c 1109 2007-02-07 23:37:50Z 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
34/**
35 * @addtogroup globalGroup
36 * @{
37 */
38/**
39 * The SIGPIPE handler sets this to TRUE.
40 */
41bool g_sigpipe = FALSE;
42
43/**
44 * PID of the "main" process.
45 */
46pid_t g_mastermind_pid = 0;
47
48/**
49 * Command line with which @c buffer was invoked.
50 */
51char g_sz_call_to_buffer[MAX_STR_LEN];
52
53/**
54 * Size of the buffer used with @c buffer.
55 */
56int g_tape_buffer_size_MB = 0;
57
58/* @} - end of globalGroup */
59
60extern char *ps_options;
61extern char *ps_proc_id;
62
63/**
64 * @addtogroup fifoGroup
65 * @{
66 */
67/**
68 * Open a pipe to/from @c buffer.
69 * If buffer does not work at all, we use `dd'.
70 * @param device The device to read from/write to.
71 * @param direction @c 'r' (reading) or @c 'w' (writing).
72 * @return A file pointer to/from the @c buffer process.
73 */
74FILE *open_device_via_buffer(char *device, char direction,
75                             long internal_tape_block_size)
76{
77    char *sz_dir;
78    char keych;
79    char *tmp;
80    FILE *fres;
81    int bufsize;                // in megabytes
82    int res;
83    int wise_upper_limit;
84    int wise_lower_limit;
85
86    assert_string_is_neither_NULL_nor_zerolength(device);
87    assert(direction == 'w' || direction == 'r');
88    mr_asprintf(&sz_dir, "%c", direction);
89    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
90    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
91    sync();
92    for (bufsize = wise_upper_limit, res = -1;
93         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
94        mr_asprintf(&tmp,
95                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
96                 internal_tape_block_size, bufsize, 'm');
97        res = run_program_and_log_output(tmp, 2);
98        mr_free(tmp);
99    }
100    if (!res) {
101        bufsize++;
102        mr_asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
103        log_to_screen(tmp);
104        mr_free(tmp);
105    } else {
106        bufsize = 0;
107        res = 0;
108        log_to_screen
109            (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
110    }
111    if (direction == 'r') {
112        keych = 'i';
113    } else {
114        keych = 'o';
115    }
116    if (bufsize) {
117        sprintf(g_sz_call_to_buffer,
118                "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
119                (direction == 'r') ? 20 : 75, internal_tape_block_size,
120                keych, device, MONDO_LOGFILE);
121    } else {
122        sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
123                internal_tape_block_size, keych, device);
124    }
125    mr_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
126    fres = popen(g_sz_call_to_buffer, sz_dir);
127    mr_free(sz_dir);
128    if (fres) {
129        mr_msg(2, "Successfully opened ('%c') tape device %s", direction,
130                device);
131    } else {
132        mr_msg(2, "Failed to open ('%c') tape device %s", direction,
133                device);
134    }
135    sleep(2);
136    mr_asprintf(&tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
137    if (run_program_and_log_output(tmp, 2)) {
138        mr_msg(2, "Warning - I think I failed to open tape, actually.");
139    }
140    mr_free(tmp);
141    g_tape_buffer_size_MB = bufsize;
142    mr_asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
143    if (run_program_and_log_output(tmp, 1)) {
144        fres = NULL;
145        log_to_screen(_("Failed to open tape streamer. Buffer error."));
146    } else {
147        log_to_screen(_("Buffer successfully started."));
148    }
149    mr_free(tmp);
150    return (fres);
151}
152
153
154/**
155 * Kill @c buffer processes.
156 * Only called in mondoarchive
157 */
158void kill_buffer()
159{
160    char *tmp;
161    char *command;
162
163    malloc_string(tmp);
164    sync();
165    if (g_sz_call_to_buffer == NULL) {
166        return;
167    }
168    if (strcmp(g_sz_call_to_buffer,"") == 0) {
169        return;
170    }
171    mr_asprintf(&command,
172            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
173    mr_msg(2, "kill_buffer() --- command = %s", command);
174    strcpy(tmp, call_program_and_get_last_line_of_output(command));
175    mr_free(command);
176
177    mr_asprintf(&command, "kill %s", tmp);
178    mr_msg(2, "kill_buffer() --- command = %s", command);
179    if (strlen(tmp) > 0) {
180        run_program_and_log_output(command, TRUE);
181    }
182    mr_free(tmp);
183    mr_free(command);
184}
185
186
187/**
188 * Handler for SIGPIPE.
189 * @param sig The signal that occurred (hopefully SIGPIPE).
190 */
191void sigpipe_occurred(int sig)
192{
193    g_sigpipe = TRUE;
194}
195
196/* @} - end of fifoGroup */
197
198/* BERLIOS: useless ?
199int
200extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
201                  char *ramdisk_fname,
202                  char *output_cfg_file,
203                  char *output_mountlist_file);
204*/
Note: See TracBrowser for help on using the repository browser.