source: trunk/mondo/mondo/common/libmondo-fifo.c @ 75

Last change on this file since 75 was 45, checked in by bcornec, 14 years ago

asprint and getline now added

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1/* $Id: libmondo-fifo.c 45 2005-10-04 22:51:47Z andree $ */
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#include <signal.h>
12#include <fcntl.h>
13#include <stdio.h>
14
15#include <errno.h>
16#include <sys/types.h>
17#include <sys/stat.h>
18#include <sys/ipc.h>
19#include <sys/shm.h>
20#include <sys/sem.h>
21#include <sys/wait.h>
22#include <pthread.h>
23
24#include "my-stuff.h"
25#include "mondostructures.h"
26#include "libmondo.h"
27
28/**
29 * @addtogroup globalGroup
30 * @{
31 */
32/**
33 * The SIGPIPE handler sets this to TRUE.
34 */
35bool g_sigpipe = FALSE;
36
37/**
38 * PID of the "main" process.
39 */
40pid_t g_mastermind_pid = 0;
41
42/**
43 * Command line with which @c buffer was invoked.
44 */
45char *g_sz_call_to_buffer;
46
47/**
48 * Size of the buffer used with @c buffer.
49 */
50int g_tape_buffer_size_MB = 0;
51
52/* @} - end of globalGroup */
53
54
55/**
56 * @addtogroup fifoGroup
57 * @{
58 */
59/**
60 * Open a pipe to/from @c buffer.
61 * If buffer does not work at all, we use `dd'.
62 * @param device The device to read from/write to.
63 * @param direction @c 'r' (reading) or @c 'w' (writing).
64 * @return A file pointer to/from the @c buffer process.
65 */
66FILE *open_device_via_buffer(char *device, char direction,
67                             long internal_tape_block_size)
68{
69    char *sz_dir;
70    char keych;
71    char *tmp;
72    FILE *fres;
73    int bufsize;                // in megabytes
74    int res;
75    int wise_upper_limit;
76    int wise_lower_limit;
77
78    assert_string_is_neither_NULL_nor_zerolength(device);
79    assert(direction == 'w' || direction == 'r');
80    asprintf(&sz_dir, "%c", direction);
81    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
82    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
83    paranoid_system("sync");
84    for (bufsize = wise_upper_limit, res = -1;
85         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
86        asprintf(&tmp,
87                 "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
88                 internal_tape_block_size, bufsize, 'm');
89        res = run_program_and_log_output(tmp, 2);
90        paranoid_free(tmp);
91    }
92    if (!res) {
93        bufsize++;
94        asprintf(&tmp, "Negotiated max buffer of %d MB ", bufsize);
95        log_to_screen(tmp);
96        paranoid_free(tmp);
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        asprintf(&g_sz_call_to_buffer,
110                 "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize,
111                 'm', (direction == 'r') ? 20 : 75,
112                 internal_tape_block_size, keych, device, MONDO_LOGFILE);
113    } else {
114        asprintf(&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    fres = popen(g_sz_call_to_buffer, sz_dir);
119    paranoid_free(sz_dir);
120    if (fres) {
121        log_msg(2, "Successfully opened ('%c') tape device %s", direction,
122                device);
123    } else {
124        log_msg(2, "Failed to open ('%c') tape device %s", direction,
125                device);
126    }
127    sleep(2);
128    asprintf(&tmp, "ps wwax | grep \"%s\"", g_sz_call_to_buffer);
129    if (run_program_and_log_output(tmp, 2)) {
130        log_msg(2, "Warning - I think I failed to open tape, actually.");
131    }
132    paranoid_free(tmp);
133    g_tape_buffer_size_MB = bufsize;
134    /* BERLIOS: usless ?
135       strcmp(tmp, g_sz_call_to_buffer);
136       tmp[30] = '\0';
137     */
138    asprintf(&tmp, "ps wwax | grep buffer | grep -v grep");
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    paranoid_system("sync");
159    asprintf(&command,
160             "ps wwax | fgrep \"%s\" | fgrep -v grep | awk '{print $1;}' | grep -v PID | tr -s '\n' ' ' | awk '{ print $1; }'",
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    asprintf(&tmp, "%s",
166             call_program_and_get_last_line_of_output(command));
167    paranoid_free(command);
168
169    asprintf(&command, "kill %s", tmp);
170    log_msg(2, "kill_buffer() --- command = %s", command);
171
172    if (strlen(tmp) > 0) {
173        run_program_and_log_output(command, TRUE);
174    }
175    paranoid_free(command);
176    paranoid_free(tmp);
177}
178
179
180/**
181 * Handler for SIGPIPE.
182 * @param sig The signal that occurred (hopefully SIGPIPE).
183 */
184void sigpipe_occurred(int sig)
185{
186    g_sigpipe = TRUE;
187}
188
189/* @} - end of fifoGroup */
190
191/* BERLIOS: useless ?
192int
193extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo,
194                  char *ramdisk_fname,
195                  char *output_cfg_file,
196                  char *output_mountlist_file);
197*/
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