source: branches/stable/mondo/src/common/libmondo-fifo.c @ 1156

Last change on this file since 1156 was 1123, checked in by Bruno Cornec, 13 years ago

Again linker fixes (hopefully last time for now)

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File size: 4.7 KB
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1/* libmondo-fifo.c
2   $Id: libmondo-fifo.c 1123 2007-02-09 22:41:03Z 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
35/**
36 * @addtogroup globalGroup
37 * @{
38 */
39/**
40 * The SIGPIPE handler sets this to TRUE.
41 */
42bool g_sigpipe = FALSE;
43
44/**
45 * PID of the "main" process.
46 */
47pid_t g_mastermind_pid = 0;
48
49/**
50 * Command line with which @c buffer was invoked.
51 */
52char g_sz_call_to_buffer[MAX_STR_LEN];
53
54/**
55 * Size of the buffer used with @c buffer.
56 */
57int g_tape_buffer_size_MB = 0;
58
59/* @} - end of globalGroup */
60
61extern char *ps_options;
62extern char *ps_proc_id;
63
64/**
65 * @addtogroup fifoGroup
66 * @{
67 */
68/**
69 * Open a pipe to/from @c buffer.
70 * If buffer does not work at all, we use `dd'.
71 * @param device The device to read from/write to.
72 * @param direction @c 'r' (reading) or @c 'w' (writing).
73 * @return A file pointer to/from the @c buffer process.
74 */
75FILE *open_device_via_buffer(char *device, char direction,
76                             long internal_tape_block_size)
77{
78    char *sz_dir;
79    char keych;
80    char *tmp;
81    FILE *fres;
82    int bufsize;                // in megabytes
83    int res;
84    int wise_upper_limit;
85    int wise_lower_limit;
86
87    assert_string_is_neither_NULL_nor_zerolength(device);
88    assert(direction == 'w' || direction == 'r');
89    mr_asprintf(&sz_dir, "%c", direction);
90    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
91    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
92    sync();
93    for (bufsize = wise_upper_limit, res = -1;
94         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
95        mr_asprintf(&tmp,
96                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
97                 internal_tape_block_size, bufsize, 'm');
98        res = run_program_and_log_output(tmp, 2);
99        mr_free(tmp);
100    }
101    if (!res) {
102        bufsize++;
103        mr_asprintf(&tmp, _("Negotiated max buffer of %d MB "), bufsize);
104        log_to_screen(tmp);
105        mr_free(tmp);
106    } else {
107        bufsize = 0;
108        res = 0;
109        log_to_screen
110            (_("Cannot negotiate a buffer of ANY size. Using dd instead."));
111    }
112    if (direction == 'r') {
113        keych = 'i';
114    } else {
115        keych = 'o';
116    }
117    if (bufsize) {
118        sprintf(g_sz_call_to_buffer,
119                "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
120                (direction == 'r') ? 20 : 75, internal_tape_block_size,
121                keych, device, MONDO_LOGFILE);
122    } else {
123        sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
124                internal_tape_block_size, keych, device);
125    }
126    mr_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
127    fres = popen(g_sz_call_to_buffer, sz_dir);
128    mr_free(sz_dir);
129    if (fres) {
130        mr_msg(2, "Successfully opened ('%c') tape device %s", direction,
131                device);
132    } else {
133        mr_msg(2, "Failed to open ('%c') tape device %s", direction,
134                device);
135    }
136    sleep(2);
137    mr_asprintf(&tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
138    if (run_program_and_log_output(tmp, 2)) {
139        mr_msg(2, "Warning - I think I failed to open tape, actually.");
140    }
141    mr_free(tmp);
142    g_tape_buffer_size_MB = bufsize;
143    mr_asprintf(&tmp, "ps %s | grep buffer | grep -v grep", ps_options);
144    if (run_program_and_log_output(tmp, 1)) {
145        fres = NULL;
146        log_to_screen(_("Failed to open tape streamer. Buffer error."));
147    } else {
148        log_to_screen(_("Buffer successfully started."));
149    }
150    mr_free(tmp);
151    return (fres);
152}
153
154
155/**
156 * Kill @c buffer processes.
157 * Only called in mondoarchive
158 */
159void kill_buffer()
160{
161    char *tmp;
162    char *command;
163
164    malloc_string(tmp);
165    sync();
166    if (g_sz_call_to_buffer == NULL) {
167        return;
168    }
169    if (strcmp(g_sz_call_to_buffer,"") == 0) {
170        return;
171    }
172    mr_asprintf(&command,
173            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
174    mr_msg(2, "kill_buffer() --- command = %s", command);
175    strcpy(tmp, call_program_and_get_last_line_of_output(command));
176    mr_free(command);
177
178    mr_asprintf(&command, "kill %s", tmp);
179    mr_msg(2, "kill_buffer() --- command = %s", command);
180    if (strlen(tmp) > 0) {
181        run_program_and_log_output(command, TRUE);
182    }
183    mr_free(tmp);
184    mr_free(command);
185}
186
187
188/**
189 * Handler for SIGPIPE.
190 * @param sig The signal that occurred (hopefully SIGPIPE).
191 */
192void sigpipe_occurred(int sig)
193{
194    g_sigpipe = TRUE;
195}
196
197/* @} - end of fifoGroup */
198
199/* BERLIOS: useless ?
200int
201extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
202                  char *ramdisk_fname,
203                  char *output_cfg_file,
204                  char *output_mountlist_file);
205*/
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