]>
git.ipfire.org Git - thirdparty/squid.git/blob - src/DiskIO/DiskDaemon/diskd.cc
4 * DEBUG: section -- External DISKD process implementation.
5 * AUTHOR: Harvest Derived
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29 * You should have received a copy of the GNU General Public License
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31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
36 #include "DiskIO/DiskDaemon/diomsg.h"
50 xassert(const char *msg
, const char *file
, int line
)
52 fprintf(stderr
,"assertion failed: %s:%d: \"%s\"\n", file
, line
, msg
);
57 const int diomsg::msg_snd_rcv_sz
= sizeof(diomsg
) - sizeof(mtyp_t
);
58 #define DEBUG(LEVEL) if ((LEVEL) <= DebugLevel)
60 typedef struct _file_state file_state
;
70 static hash_table
*hash
= NULL
;
73 static int DebugLevel
= 0;
76 do_open(diomsg
* r
, int len
, const char *buf
)
81 * note r->offset holds open() flags
83 fd
= open(buf
, r
->offset
, 0600);
87 fprintf(stderr
, "%d %s: ", (int) mypid
, buf
);
94 fs
= (file_state
*)xcalloc(1, sizeof(*fs
));
96 fs
->key
= &fs
->id
; /* gack */
98 hash_join(hash
, (hash_link
*) fs
);
100 fprintf(stderr
, "%d OPEN id %d, FD %d, fs %p\n",
110 do_close(diomsg
* r
, int len
)
114 fs
= (file_state
*) hash_lookup(hash
, &r
->id
);
119 fprintf(stderr
, "%d CLOSE id %d: ", (int) mypid
, r
->id
);
127 hash_remove_link(hash
, (hash_link
*) fs
);
129 fprintf(stderr
, "%d CLOSE id %d, FD %d, fs %p\n",
140 do_read(diomsg
* r
, int len
, char *buf
)
143 int readlen
= r
->size
;
145 fs
= (file_state
*) hash_lookup(hash
, &r
->id
);
150 fprintf(stderr
, "%d READ id %d: ", (int) mypid
, r
->id
);
157 if (r
->offset
> -1 && r
->offset
!= fs
->offset
) {
159 fprintf(stderr
, "seeking to %" PRId64
"\n", (int64_t)r
->offset
);
162 if (lseek(fs
->fd
, r
->offset
, SEEK_SET
) < 0) {
164 fprintf(stderr
, "%d FD %d, offset %" PRId64
": ", (int) mypid
, fs
->fd
, (int64_t)r
->offset
);
170 x
= read(fs
->fd
, buf
, readlen
);
172 fprintf(stderr
, "%d READ %d,%d,%" PRId64
" ret %d\n", (int) mypid
,
173 fs
->fd
, readlen
, (int64_t)r
->offset
, x
);
178 fprintf(stderr
, "%d FD %d: ", (int) mypid
, fs
->fd
);
185 fs
->offset
= r
->offset
+ x
;
190 do_write(diomsg
* r
, int len
, const char *buf
)
192 int wrtlen
= r
->size
;
195 fs
= (file_state
*) hash_lookup(hash
, &r
->id
);
200 fprintf(stderr
, "%d WRITE id %d: ", (int) mypid
, r
->id
);
207 if (r
->offset
> -1 && r
->offset
!= fs
->offset
) {
208 if (lseek(fs
->fd
, r
->offset
, SEEK_SET
) < 0) {
210 fprintf(stderr
, "%d FD %d, offset %" PRId64
": ", (int) mypid
, fs
->fd
, (int64_t)r
->offset
);
217 fprintf(stderr
, "%d WRITE %d,%d,%" PRId64
"\n", (int) mypid
,
218 fs
->fd
, wrtlen
, (int64_t)r
->offset
);
220 x
= write(fs
->fd
, buf
, wrtlen
);
224 fprintf(stderr
, "%d FD %d: ", (int) mypid
, fs
->fd
);
231 fs
->offset
= r
->offset
+ x
;
236 do_unlink(diomsg
* r
, int len
, const char *buf
)
238 if (unlink(buf
) < 0) {
240 fprintf(stderr
, "%d UNLNK id %d %s: ", (int) mypid
, r
->id
, buf
);
248 fprintf(stderr
, "%d UNLNK %s\n", (int) mypid
, buf
);
254 msg_handle(diomsg
* r
, int rl
, diomsg
* s
)
259 s
->seq_no
= r
->seq_no
; /* optional, debugging */
260 s
->callback_data
= r
->callback_data
;
261 s
->requestor
= r
->requestor
;
262 s
->size
= 0; /* optional, debugging */
263 s
->offset
= 0; /* optional, debugging */
264 s
->shm_offset
= r
->shm_offset
;
265 s
->newstyle
= r
->newstyle
;
267 if (s
->shm_offset
> -1)
268 buf
= shmbuf
+ s
->shm_offset
;
275 s
->status
= do_open(r
, rl
, buf
);
279 s
->status
= do_close(r
, rl
);
283 s
->status
= do_read(r
, rl
, buf
);
287 s
->status
= do_write(r
, rl
, buf
);
291 s
->status
= do_unlink(r
, rl
, buf
);
301 fsCmp(const void *a
, const void *b
)
303 const int *A
= (const int *)a
;
304 const int *B
= (const int *)b
;
309 fsHash(const void *key
, unsigned int n
)
311 /* note, n must be a power of 2! */
312 const int *k
= (const int *)key
;
318 alarm_handler(int sig
) {
324 main(int argc
, char *argv
[])
336 setbuf(stdout
, NULL
);
337 setbuf(stderr
, NULL
);
341 rmsgid
= msgget(key
, 0600);
349 smsgid
= msgget(key
, 0600);
357 shmid
= shmget(key
, 0, 0600);
364 shmbuf
= (char *)shmat(shmid
, NULL
, 0);
366 if (shmbuf
== (void *) -1) {
371 hash
= hash_create(fsCmp
, 1 << 4, fsHash
);
373 fcntl(0, F_SETFL
, SQUID_NONBLOCK
);
374 memset(&sa
, '\0', sizeof(sa
));
375 sa
.sa_handler
= alarm_handler
;
376 sa
.sa_flags
= SA_RESTART
;
377 sigaction(SIGALRM
, &sa
, NULL
);
381 memset(&rmsg
, '\0', sizeof(rmsg
));
383 std::cerr
<< "msgrcv: " << rmsgid
<< ", "
384 << &rmsg
<< ", " << diomsg::msg_snd_rcv_sz
385 << ", " << 0 << ", " << 0 << std::endl
;
387 rlen
= msgrcv(rmsgid
, &rmsg
, diomsg::msg_snd_rcv_sz
, 0, 0);
390 if (EINTR
== errno
) {
391 if (read(0, rbuf
, 512) <= 0) {
392 if (EWOULDBLOCK
== errno
)
394 else if (EAGAIN
== errno
)
401 if (EAGAIN
== errno
) {
410 msg_handle(&rmsg
, rlen
, &smsg
);
412 if (msgsnd(smsgid
, &smsg
, diomsg::msg_snd_rcv_sz
, 0) < 0) {
419 fprintf(stderr
, "%d diskd exiting\n", (int) mypid
);
422 if (msgctl(rmsgid
, IPC_RMID
, 0) < 0)
423 perror("msgctl IPC_RMID");
425 if (msgctl(smsgid
, IPC_RMID
, 0) < 0)
426 perror("msgctl IPC_RMID");
428 if (shmdt(shmbuf
) < 0)
431 if (shmctl(shmid
, IPC_RMID
, 0) < 0)
432 perror("shmctl IPC_RMID");