source: branches/2.04_berlios/mondo/mondo/common/libmondo-fifo.c @ 2708

Last change on this file since 2708 was 2708, checked in by bruno, 8 years ago

r4184@localhost: bruno | 2011-01-27 15:52:51 +0100

  • Adds support for hpsa driver (new HP Smart Array driver)
  • Property svn:keywords set to Id
File size: 7.1 KB
Line 
1/* libmondo-fifo.c
2   $Id: libmondo-fifo.c 2708 2011-01-27 18:31:44Z 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
138
139/**
140 * @addtogroup fifoGroup
141 * @{
142 */
143/**
144 * Open a pipe to/from @c buffer.
145 * If buffer does not work at all, we use `dd'.
146 * @param device The device to read from/write to.
147 * @param direction @c 'r' (reading) or @c 'w' (writing).
148 * @return A file pointer to/from the @c buffer process.
149 */
150FILE*open_device_via_buffer(char*device, char direction, long internal_tape_block_size)
151{
152  char sz_dir[32];
153  char keych;
154  char *tmp;
155  char *command;
156  FILE*fres;
157  int bufsize; // in megabytes
158  int res;
159  int wise_upper_limit;
160  int wise_lower_limit;
161
162  malloc_string(tmp);
163  malloc_string(command);
164  assert_string_is_neither_NULL_nor_zerolength(device);
165  assert(direction=='w'||direction=='r');
166  sprintf(sz_dir, "%c", direction);
167  wise_upper_limit = (am_I_in_disaster_recovery_mode() ? 8 : 32);
168  wise_lower_limit = 1; // wise_upper_limit/2 + 1;
169  paranoid_system("sync");
170  for(bufsize=wise_upper_limit,res=-1; res!=0 && bufsize>=wise_lower_limit; bufsize--)
171    {
172      sprintf(tmp, "dd if=/dev/zero bs=1024 count=16k 2> /dev/null | buffer -o /dev/null -s %ld -m %d%c", internal_tape_block_size, bufsize, 'm');
173      res = run_program_and_log_output(tmp, 2);
174    }
175  if (!res)
176    {
177      bufsize++;
178      sprintf(tmp, "Negotiated max buffer of %d MB ", bufsize);
179      log_to_screen(tmp);
180    }
181  else
182    {
183      bufsize=0;
184      res=0;
185      log_to_screen("Cannot negotiate a buffer of ANY size. Using dd instead.");
186    }
187  if (direction=='r')
188    { keych = 'i'; }
189  else
190    { keych = 'o'; }
191  if (bufsize)
192    { sprintf(g_sz_call_to_buffer, "buffer -m %d%c -p%d -B -s%ld -%c %s 2>> %s", bufsize, 'm', (direction=='r')?20:75, internal_tape_block_size, keych, device, MONDO_LOGFILE); }
193  else
194    { sprintf(g_sz_call_to_buffer, "dd bs=%ld %cf=%s", internal_tape_block_size, keych, device); }
195  log_msg (2, "Calling buffer --- command = '%s'", g_sz_call_to_buffer);
196  fres = popen(g_sz_call_to_buffer, sz_dir);
197  if (fres)
198    { log_msg (2, "Successfully opened ('%c') tape device %s", direction, device); }
199  else
200    { log_msg (2, "Failed to open ('%c') tape device %s", direction, device); }
201  sleep(2);
202  sprintf(tmp, "ps wwax | grep \"%s\"", g_sz_call_to_buffer);
203  if (run_program_and_log_output(tmp, 2))
204    { log_msg(2, "Warning - I think I failed to open tape, actually."); }
205  g_tape_buffer_size_MB = bufsize;
206  strcmp(tmp, g_sz_call_to_buffer);
207  tmp[30] = '\0';
208  sprintf(command, "ps wwax | grep buffer | grep -v grep");
209  if (run_program_and_log_output(command, 1))
210    {
211      fres = NULL;
212      log_to_screen("Failed to open tape streamer. Buffer error.");
213    }
214  else
215    {
216      log_to_screen("Buffer successfully started.");
217    }
218
219  paranoid_free(command);
220  paranoid_free(tmp);
221  return(fres);
222}
223
224
225/**
226 * Kill @c buffer processes.
227 */
228void kill_buffer()
229{
230  char *tmp;
231  char *command;
232
233  malloc_string(tmp);
234  malloc_string(command);
235  paranoid_system("sync");
236  sprintf(command, "ps wwax | fgrep \"%s\" | fgrep -v grep | awk '{print $1;}' | grep -v PID | tr -s '\n' ' ' | awk '{ print $1; }'", g_sz_call_to_buffer);
237  log_msg (2, "kill_buffer() --- command = %s", command);
238  strcpy(tmp, call_program_and_get_last_line_of_output(command));
239  sprintf(command, "kill %s", tmp);
240  log_msg (2, "kill_buffer() --- command = %s", command);
241  if (strlen(tmp)>0) { run_program_and_log_output(command, TRUE); }
242  paranoid_free(tmp);
243  paranoid_free(command);
244}
245
246
247
248
249
250/**
251 * Handler for SIGPIPE.
252 * @param sig The signal that occurred (hopefully SIGPIPE).
253 */
254void sigpipe_occurred(int sig)
255{
256  g_sigpipe = TRUE;
257}
258
259/* @} - end of fifoGroup */
260
261int 
262extract_config_file_from_ramdisk( struct s_bkpinfo *bkpinfo, 
263                  char *ramdisk_fname, 
264                  char *output_cfg_file, 
265                  char *output_mountlist_file);
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