source: branches/stable/mondo/src/common/libmondo-fifo.c @ 941

Last change on this file since 941 was 941, checked in by Bruno Cornec, 13 years ago

Fix a bug in libmondo-fifo.c where potentially no buffer content could let mondo running forever in case of an exception

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1/* libmondo-fifo.c
2   $Id: libmondo-fifo.c 941 2006-11-18 00:12:12Z bruno $
3
4
504/17
6- replaced INTERNAL_TAPE_BLK_SIZE with bkpinfo->internal_tape_block_size
7
804/04/2004
9- ps wax is now ps wwax
10
1109/10/2003
12- p75 is now p80 in outopening tape call
13- negotiate largest buffer possible when opening tape drive
14- fall back to dd if buffer fails
15
1609/09
17- better logging for tape users
18- working on try_hard_to_fwrite(), try_hard_to_fread()
19- replaced internal w/ EXTERNAL 'buffer' exe.
20
2108/30
22- tweaked error msgs in try_hard_to_fwrite()
23
2408/02
25- updated is_incoming_block_valid() to make it
26  return end-of-tape if >300 flotsam blocks
27
2805/02
29- when logging tape errors, don't repeat self
30
3104/24
32- added lots of log_OS_error()'s and assert()'s
33
3404/22
35- copy_file_from_here_to_there() --- added a bit of fault tolerance;
36  if write fails, retry a few times before reporting error
37
3804/07/2003
39- line 866 --- set block_size used by internal buffer to 32768;
40  was INTERNAL_TAPE_BLK_SIZE/2
41
4210/01 - 11/30/2002
43- is_incoming_block_valid() --- always make
44  checksums %65536, just in case int size is
45  odd (GRRR, ArkLinux)
46- disabled rotor-related superfluous warnings
47- added INTERNAL_TAPE_BLK_SIZE
48- do_sem() now returns int explicitly
49- changed internal_block_size
50- some irregularities (e.g. bad 'type'-ing) found by Kylix; fixed by Hugo
51
5209/01 - 09/30
53- change 64k to TAPE_BLOCK_SIZE
54- added internal_block_size; set it to TAPE_BLOCK_SIZE*2
55- if data is flowing FROM tape TO hard disk then set the threshold to 10 (not 75)
56- lots of multitape-related fixes
57- finally caught & fixed the 'won't finish unzipping last bigfile' bug
58- added WIFEXITED() after waitpid(), to improve multi-tape support
59
6008/01 - 08/31
61- trying to catch & stop 'won't finish unzipping last bigfile' bug by
62  changing the copy_file_rom_here_to_there code
63- changed % threshold from 95 back to 75
64- don't insist on full 256K write of last block to tape
65- if >25 secs go by & all data (AFAIK) has been copied thru by FIFO wrapper
66  and g_tape_stream is _still_ not closed then shrug shoulders & pthread_exit
67  anyway...
68- change fprintf()'s to log_it()'s
69- added a header+footer to each block as it is read/written to/from tape
70  by copy_file_from_here_to_there
71- wrote workaround to allow >2GB of archives w/buffering
72- changed % threshold from 75 to 95
73- added calls to set_signals(); 'buffer' was killing mondoarchive as
74  it terminated
75- cleaned up struct-passing, to improve reliability and eliminate
76  some race conditions
77- changed some forks to pthreads
78- added some comments
79- created libfifo{.c,.h,-EXT.h}
80- copied core of 'buffer' here
81- added some other, Mondo-specific functions
82- hacked 'buffer' into user-friendliness
83*/
84
85/**
86 * @file
87 * Functions to handle buffering of tape archives as they are read/written.
88 * This used the external program @c buffer mostly.
89 */
90
91#include <unistd.h>
92#include <stdio.h>
93#include <signal.h>
94#include <fcntl.h>
95#include <stdio.h>
96
97#include <errno.h>
98#include <sys/types.h>
99#include <sys/stat.h>
100#include <sys/ipc.h>
101#include <sys/shm.h>
102#include <sys/sem.h>
103#include <sys/wait.h>
104#include <pthread.h>
105
106#include "my-stuff.h"
107#include "mondostructures.h"
108#include "libmondo.h"
109
110/**
111 * @addtogroup globalGroup
112 * @{
113 */
114/**
115 * The SIGPIPE handler sets this to TRUE.
116 */
117bool g_sigpipe = FALSE;
118
119/**
120 * PID of the "main" process.
121 */
122pid_t g_mastermind_pid = 0;
123
124
125
126/**
127 * Command line with which @c buffer was invoked.
128 */
129char g_sz_call_to_buffer[MAX_STR_LEN];
130
131/**
132 * Size of the buffer used with @c buffer.
133 */
134int g_tape_buffer_size_MB = 0;
135
136/* @} - end of globalGroup */
137
138extern char *ps_options;
139extern char *ps_proc_id;
140
141/**
142 * @addtogroup fifoGroup
143 * @{
144 */
145/**
146 * Open a pipe to/from @c buffer.
147 * If buffer does not work at all, we use `dd'.
148 * @param device The device to read from/write to.
149 * @param direction @c 'r' (reading) or @c 'w' (writing).
150 * @return A file pointer to/from the @c buffer process.
151 */
152FILE *open_device_via_buffer(char *device, char direction,
153                             long internal_tape_block_size)
154{
155    char sz_dir[32];
156    char keych;
157    char *tmp;
158    char *command;
159    FILE *fres;
160    int bufsize;                // in megabytes
161    int res;
162    int wise_upper_limit;
163    int wise_lower_limit;
164
165    malloc_string(tmp);
166    malloc_string(command);
167    assert_string_is_neither_NULL_nor_zerolength(device);
168    assert(direction == 'w' || direction == 'r');
169    sprintf(sz_dir, "%c", direction);
170    wise_upper_limit = (am_I_in_disaster_recovery_mode()? 8 : 32);
171    wise_lower_limit = 1;       // wise_upper_limit/2 + 1;
172    paranoid_system("sync");
173    for (bufsize = wise_upper_limit, res = -1;
174         res != 0 && bufsize >= wise_lower_limit; bufsize--) {
175        sprintf(tmp,
176                "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c",
177                internal_tape_block_size, bufsize, 'm');
178        res = run_program_and_log_output(tmp, 2);
179    }
180    if (!res) {
181        bufsize++;
182        sprintf(tmp, "Negotiated max buffer of %d MB ", bufsize);
183        log_to_screen(tmp);
184    } else {
185        bufsize = 0;
186        res = 0;
187        log_to_screen
188            ("Cannot negotiate a buffer of ANY size. Using dd instead.");
189    }
190    if (direction == 'r') {
191        keych = 'i';
192    } else {
193        keych = 'o';
194    }
195    if (bufsize) {
196        sprintf(g_sz_call_to_buffer,
197                "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm',
198                (direction == 'r') ? 20 : 75, internal_tape_block_size,
199                keych, device, MONDO_LOGFILE);
200    } else {
201        sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s",
202                internal_tape_block_size, keych, device);
203    }
204    log_msg(2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
205    fres = popen(g_sz_call_to_buffer, sz_dir);
206    if (fres) {
207        log_msg(2, "Successfully opened ('%c') tape device %s", direction,
208                device);
209    } else {
210        log_msg(2, "Failed to open ('%c') tape device %s", direction,
211                device);
212    }
213    sleep(2);
214    sprintf(tmp, "ps %s | grep \"%s\"", ps_options, g_sz_call_to_buffer);
215    if (run_program_and_log_output(tmp, 2)) {
216        log_msg(2, "Warning - I think I failed to open tape, actually.");
217    }
218    g_tape_buffer_size_MB = bufsize;
219    tmp[30] = '\0';
220    sprintf(command, "ps %s | grep buffer | grep -v grep", ps_options);
221    if (run_program_and_log_output(command, 1)) {
222        fres = NULL;
223        log_to_screen("Failed to open tape streamer. Buffer error.");
224    } else {
225        log_to_screen("Buffer successfully started.");
226    }
227
228    paranoid_free(command);
229    paranoid_free(tmp);
230    return (fres);
231}
232
233
234/**
235 * Kill @c buffer processes.
236 * Only called in mondoarchive
237 */
238void kill_buffer()
239{
240    char *tmp;
241    char *command;
242
243    if (g_sz_call_to_buffer == NULL) {
244        return;
245    }
246    if (strcmp(g_sz_call_to_buffer,"") == 0) {
247        return;
248    }
249    malloc_string(tmp);
250    malloc_string(command);
251    paranoid_system("sync");
252    sprintf(command,
253            "ps %s | grep -F \"%s\" | grep -Fv grep | awk '{print $2;}' | grep -v PID | head -1", ps_options, g_sz_call_to_buffer);
254    log_msg(2, "kill_buffer() --- command = %s", command);
255    strcpy(tmp, call_program_and_get_last_line_of_output(command));
256    sprintf(command, "kill %s", tmp);
257    log_msg(2, "kill_buffer() --- command = %s", command);
258    if (strlen(tmp) > 0) {
259        run_program_and_log_output(command, TRUE);
260    }
261    paranoid_free(tmp);
262    paranoid_free(command);
263}
264
265
266
267
268
269/**
270 * Handler for SIGPIPE.
271 * @param sig The signal that occurred (hopefully SIGPIPE).
272 */
273void sigpipe_occurred(int sig)
274{
275    g_sigpipe = TRUE;
276}
277
278/* @} - end of fifoGroup */
279
280int
281extract_config_file_from_ramdisk(struct s_bkpinfo *bkpinfo,
282                                 char *ramdisk_fname,
283                                 char *output_cfg_file,
284                                 char *output_mountlist_file);
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