]>
git.ipfire.org Git - thirdparty/squid.git/blob - src/fd.cc
5 * DEBUG: section 51 Filedescriptor Functions
6 * AUTHOR: Duane Wessels
8 * SQUID Web Proxy Cache http://www.squid-cache.org/
9 * ----------------------------------------------------------
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15 * Copyrighted (C) 2001 by the Regents of the University of
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20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
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32 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
37 #include "comm/Loops.h"
41 #include "profiler/Profiler.h"
42 #include "SquidTime.h"
45 // Solaris and possibly others lack MSG_NOSIGNAL optimization
46 // TODO: move this into compat/? Use a dedicated compat file to avoid dragging
47 // sys/types.h and sys/socket.h into the rest of Squid??
49 #define MSG_NOSIGNAL 0
52 int default_read_method(int, char *, int);
53 int default_write_method(int, const char *, int);
55 int socket_read_method(int, char *, int);
56 int socket_write_method(int, const char *, int);
57 int file_read_method(int, char *, int);
58 int file_write_method(int, const char *, int);
60 int msghdr_read_method(int, char *, int);
61 int msghdr_write_method(int, const char *, int);
64 const char *fdTypeStr
[] = {
74 static void fdUpdateBiggest(int fd
, int);
77 fdUpdateBiggest(int fd
, int opening
)
82 assert(fd
< Squid_MaxFD
);
84 if (fd
> Biggest_FD
) {
86 * assert that we are not closing a FD bigger than
87 * our known biggest FD
94 /* if we are here, then fd == Biggest_FD */
96 * assert that we are closing the biggest FD; we can't be
101 while (Biggest_FD
>= 0 && !fd_table
[Biggest_FD
].flags
.open
)
108 fde
*F
= &fd_table
[fd
];
111 assert(F
->flags
.open
== 1);
113 if (F
->type
== FD_FILE
) {
114 assert(F
->read_handler
== NULL
);
115 assert(F
->write_handler
== NULL
);
118 debugs(51, 3, "fd_close FD " << fd
<< " " << F
->desc
);
119 Comm::SetSelect(fd
, COMM_SELECT_READ
, NULL
, NULL
, 0);
120 Comm::SetSelect(fd
, COMM_SELECT_WRITE
, NULL
, NULL
, 0);
122 fdUpdateBiggest(fd
, 0);
130 socket_read_method(int fd
, char *buf
, int len
)
134 i
= recv(fd
, (void *) buf
, len
, 0);
140 file_read_method(int fd
, char *buf
, int len
)
144 i
= _read(fd
, buf
, len
);
150 socket_write_method(int fd
, const char *buf
, int len
)
154 i
= send(fd
, (const void *) buf
, len
, 0);
160 file_write_method(int fd
, const char *buf
, int len
)
164 i
= (_write(fd
, buf
, len
));
171 default_read_method(int fd
, char *buf
, int len
)
175 i
= read(fd
, buf
, len
);
181 default_write_method(int fd
, const char *buf
, int len
)
185 i
= write(fd
, buf
, len
);
191 msghdr_read_method(int fd
, char *buf
, int len
)
194 const int i
= recvmsg(fd
, reinterpret_cast<msghdr
*>(buf
), MSG_DONTWAIT
);
200 msghdr_write_method(int fd
, const char *buf
, int len
)
203 const int i
= sendmsg(fd
, reinterpret_cast<const msghdr
*>(buf
), MSG_NOSIGNAL
);
205 return i
> 0 ? len
: i
; // len is imprecise but the caller expects a match
211 fd_open(int fd
, unsigned int type
, const char *desc
)
218 debugs(51, DBG_IMPORTANT
, "WARNING: Closing open FD " << std::setw(4) << fd
);
222 assert(!F
->flags
.open
);
223 debugs(51, 3, "fd_open() FD " << fd
<< " " << desc
);
229 F
->win32
.handle
= _get_osfhandle(fd
);
236 F
->read_method
= &socket_read_method
;
237 F
->write_method
= &socket_write_method
;
243 F
->read_method
= &file_read_method
;
244 F
->write_method
= &file_write_method
;
248 fatalf("fd_open(): unknown FD type - FD#: %i, type: %u, desc %s\n", fd
, type
, desc
);
255 F
->read_method
= &msghdr_read_method
;
256 F
->write_method
= &msghdr_write_method
;
260 F
->read_method
= &default_read_method
;
261 F
->write_method
= &default_write_method
;
267 fdUpdateBiggest(fd
, 1);
270 xstrncpy(F
->desc
, desc
, FD_DESC_SZ
);
276 fd_note(int fd
, const char *s
)
278 fde
*F
= &fd_table
[fd
];
279 xstrncpy(F
->desc
, s
, FD_DESC_SZ
);
283 fd_bytes(int fd
, int len
, unsigned int type
)
285 fde
*F
= &fd_table
[fd
];
290 assert(type
== FD_READ
|| type
== FD_WRITE
);
293 F
->bytes_read
+= len
;
295 F
->bytes_written
+= len
;
304 for (i
= 0; i
< Squid_MaxFD
; ++i
) {
310 if (i
== fileno(debug_log
))
313 debugs(51, DBG_IMPORTANT
, "Open FD "<< std::left
<< std::setw(10) <<
314 (F
->bytes_read
&& F
->bytes_written
? "READ/WRITE" :
315 F
->bytes_read
? "READING" : F
->bytes_written
? "WRITING" :
317 " "<< std::right
<< std::setw(4) << i
<< " " << F
->desc
);
324 return Squid_MaxFD
- Number_FD
- Opening_FD
;
330 int nrfree
= fdNFree();
332 if (nrfree
< (RESERVED_FD
<< 1))
335 if (nrfree
< (Number_FD
>> 2))
341 /* Called when we runs out of file descriptors */
343 fdAdjustReserved(void)
347 static time_t last
= 0;
349 * don't update too frequently
352 if (last
+ 5 > squid_curtime
)
356 * Calculate a new reserve, based on current usage and a small extra
358 newReserve
= Squid_MaxFD
- Number_FD
+ min(25, Squid_MaxFD
/ 16);
360 if (newReserve
<= RESERVED_FD
)
363 x
= Squid_MaxFD
- 20 - min(25, Squid_MaxFD
/ 16);
365 if (newReserve
> x
) {
366 /* perhaps this should be fatal()? -DW */
367 debugs(51, DBG_CRITICAL
, "WARNING: This machine has a serious shortage of filedescriptors.");
371 if (Squid_MaxFD
- newReserve
< min(256, Squid_MaxFD
/ 2))
372 fatalf("Too few filedescriptors available in the system (%d usable of %d).\n", Squid_MaxFD
- newReserve
, Squid_MaxFD
);
374 debugs(51, DBG_CRITICAL
, "Reserved FD adjusted from " << RESERVED_FD
<< " to " << newReserve
<< " due to failures");
375 RESERVED_FD
= newReserve
;