-
/*
- * $Id: unlinkd.cc,v 1.52 2003/02/21 22:50:12 robertc Exp $
- *
- * DEBUG: section 2 Unlink Daemon
- * AUTHOR: Duane Wessels
- *
- * SQUID Web Proxy Cache http://www.squid-cache.org/
- * ----------------------------------------------------------
- *
- * Squid is the result of efforts by numerous individuals from
- * the Internet community; see the CONTRIBUTORS file for full
- * details. Many organizations have provided support for Squid's
- * development; see the SPONSORS file for full details. Squid is
- * Copyrighted (C) 2001 by the Regents of the University of
- * California; see the COPYRIGHT file for full details. Squid
- * incorporates software developed and/or copyrighted by other
- * sources; see the CREDITS file for full details.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+ * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
*
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
*/
-#include "squid.h"
-
-#ifdef UNLINK_DAEMON
-
-/* This is the external unlinkd process */
-
-#define UNLINK_BUF_LEN 1024
-
-int
-main(int argc, char *argv[])
-{
- char buf[UNLINK_BUF_LEN];
- char *t;
- int x;
- setbuf(stdin, NULL);
- setbuf(stdout, NULL);
- close(2);
- open("/dev/null", O_RDWR);
-
- while (fgets(buf, UNLINK_BUF_LEN, stdin)) {
- if ((t = strchr(buf, '\n')))
- *t = '\0';
-
-#if USE_TRUNCATE
-
- x = truncate(buf, 0);
-
-#else
-
- x = unlink(buf);
-
-#endif
-
- if (x < 0)
- printf("ERR\n");
- else
- printf("OK\n");
- }
-
- exit(0);
-}
+/* DEBUG: section 02 Unlink Daemon */
-#else /* UNLINK_DAEMON */
+#include "squid.h"
+#if USE_UNLINKD
+#include "disk.h"
+#include "fd.h"
#include "fde.h"
+#include "globals.h"
+#include "SquidIpc.h"
+#include "SquidTime.h"
+#include "StatCounters.h"
+#include "SwapDir.h"
+#include "tools.h"
+#include "xusleep.h"
/* This code gets linked to Squid */
static int unlinkd_wfd = -1;
static int unlinkd_rfd = -1;
+static void * hIpc;
+static pid_t pid;
+
#define UNLINKD_QUEUE_LIMIT 20
void
{
char buf[MAXPATHLEN];
int l;
- int x;
+ int bytes_written;
static int queuelen = 0;
if (unlinkd_wfd < 0) {
}
/*
- * If the queue length is greater than our limit, then
- * we pause for up to 100ms, hoping that unlinkd
- * has some feedback for us. Maybe it just needs a slice
- * of the CPU's time.
- */
+ * If the queue length is greater than our limit, then we pause
+ * for a small amount of time, hoping that unlinkd has some
+ * feedback for us. Maybe it just needs a slice of the CPU's
+ * time.
+ */
if (queuelen >= UNLINKD_QUEUE_LIMIT) {
-
+#if defined(USE_EPOLL) || defined(USE_KQUEUE) || defined(USE_DEVPOLL)
+ /*
+ * DPW 2007-04-23
+ * We can't use fd_set when using epoll() or kqueue(). In
+ * these cases we block for 10 ms.
+ */
+ xusleep(10000);
+#else
+ /*
+ * DPW 2007-04-23
+ * When we can use select, block for up to 100 ms.
+ */
struct timeval to;
fd_set R;
FD_ZERO(&R);
to.tv_sec = 0;
to.tv_usec = 100000;
select(unlinkd_rfd + 1, &R, NULL, NULL, &to);
+#endif
}
/*
* decrement the queue size by the number of newlines read.
*/
if (queuelen > 0) {
- int x;
+ int bytes_read;
int i;
char rbuf[512];
- x = read(unlinkd_rfd, rbuf, 511);
+ bytes_read = read(unlinkd_rfd, rbuf, 511);
- if (x > 0) {
- rbuf[x] = '\0';
+ if (bytes_read > 0) {
+ rbuf[bytes_read] = '\0';
- for (i = 0; i < x; i++)
+ for (i = 0; i < bytes_read; ++i)
if ('\n' == rbuf[i])
- queuelen--;
+ --queuelen;
assert(queuelen >= 0);
}
l = strlen(path);
assert(l < MAXPATHLEN);
xstrncpy(buf, path, MAXPATHLEN);
- buf[l++] = '\n';
- x = write(unlinkd_wfd, buf, l);
+ buf[l] = '\n';
+ ++l;
+ bytes_written = write(unlinkd_wfd, buf, l);
- if (x < 0) {
- debug(2, 1) ("unlinkdUnlink: write FD %d failed: %s\n",
- unlinkd_wfd, xstrerror());
+ if (bytes_written < 0) {
+ debugs(2, DBG_IMPORTANT, "unlinkdUnlink: write FD " << unlinkd_wfd << " failed: " << xstrerror());
safeunlink(path, 0);
return;
- } else if (x != l) {
- debug(2, 1) ("unlinkdUnlink: FD %d only wrote %d of %d bytes\n",
- unlinkd_wfd, x, l);
+ } else if (bytes_written != l) {
+ debugs(2, DBG_IMPORTANT, "unlinkdUnlink: FD " << unlinkd_wfd << " only wrote " << bytes_written << " of " << l << " bytes");
safeunlink(path, 0);
return;
}
- statCounter.unlink.requests++;
+ ++statCounter.unlink.requests;
/*
* Increment this syscalls counter here, even though the syscall
* is executed by the helper process. We try to be consistent
* in counting unlink operations.
*/
- statCounter.syscalls.disk.unlinks++;
- queuelen++;
+ ++statCounter.syscalls.disk.unlinks;
+ ++queuelen;
}
void
unlinkdClose(void)
+#if _SQUID_WINDOWS_
{
+
+ if (unlinkd_wfd > -1) {
+ debugs(2, DBG_IMPORTANT, "Closing unlinkd pipe on FD " << unlinkd_wfd);
+ shutdown(unlinkd_wfd, SD_BOTH);
+ comm_close(unlinkd_wfd);
+
+ if (unlinkd_wfd != unlinkd_rfd)
+ comm_close(unlinkd_rfd);
+
+ unlinkd_wfd = -1;
+
+ unlinkd_rfd = -1;
+ }
+
+ if (hIpc) {
+ if (WaitForSingleObject(hIpc, 5000) != WAIT_OBJECT_0) {
+ getCurrentTime();
+ debugs(2, DBG_IMPORTANT, "unlinkdClose: WARNING: (unlinkd," << pid << "d) didn't exit in 5 seconds");
+ }
+
+ CloseHandle(hIpc);
+ }
+}
+#else
+{
+
if (unlinkd_wfd < 0)
return;
- debug(2, 1) ("Closing unlinkd pipe on FD %d\n", unlinkd_wfd);
+ debugs(2, DBG_IMPORTANT, "Closing unlinkd pipe on FD " << unlinkd_wfd);
file_close(unlinkd_wfd);
unlinkd_rfd = -1;
}
+#endif
+
+bool
+unlinkdNeeded(void)
+{
+ // we should start unlinkd if there are any cache_dirs using it
+ for (int i = 0; i < Config.cacheSwap.n_configured; ++i) {
+ const RefCount<SwapDir> sd = Config.cacheSwap.swapDirs[i];
+ if (sd->unlinkdUseful())
+ return true;
+ }
+
+ return false;
+}
+
void
unlinkdInit(void)
{
- int x;
+ if (unlinkd_wfd >= 0)
+ return; // unlinkd already started
+
const char *args[2];
+ Ip::Address localhost;
- struct timeval slp;
args[0] = "(unlinkd)";
args[1] = NULL;
-#if USE_POLL && defined(_SQUID_OSF_)
- /* pipes and poll() don't get along on DUNIX -DW */
- x = ipcCreate(IPC_STREAM,
+ localhost.setLocalhost();
+
+ pid = ipcCreate(
+#if USE_POLL && _SQUID_OSF_
+ /* pipes and poll() don't get along on DUNIX -DW */
+ IPC_STREAM,
+#elif _SQUID_WINDOWS_
+ /* select() will fail on a pipe */
+ IPC_TCP_SOCKET,
#else
-/* We currently need to use FIFO.. see below */
-x = ipcCreate(IPC_FIFO,
+ /* We currently need to use FIFO.. see below */
+ IPC_FIFO,
#endif
- Config.Program.unlinkd,
- args,
- "unlinkd",
- &unlinkd_rfd,
- &unlinkd_wfd);
-
- if (x < 0)
+ Config.Program.unlinkd,
+ args,
+ "unlinkd",
+ localhost,
+ &unlinkd_rfd,
+ &unlinkd_wfd,
+ &hIpc);
+
+ if (pid < 0)
fatal("Failed to create unlinkd subprocess");
- slp.tv_sec = 0;
- slp.tv_usec = 250000;
- select(0, NULL, NULL, NULL, &slp);
+
+ xusleep(250000);
+
fd_note(unlinkd_wfd, "squid -> unlinkd");
+
fd_note(unlinkd_rfd, "unlinkd -> squid");
- commSetTimeout(unlinkd_rfd, -1, NULL, NULL);
- commSetTimeout(unlinkd_wfd, -1, NULL, NULL);
+
+ commUnsetFdTimeout(unlinkd_rfd);
+ commUnsetFdTimeout(unlinkd_wfd);
+
/*
* unlinkd_rfd should already be non-blocking because of
* ipcCreate. We change unlinkd_wfd to blocking mode because
* do this only for the IPC_FIFO case.
*/
assert(fd_table[unlinkd_rfd].flags.nonblocking);
+
if (FD_PIPE == fd_table[unlinkd_wfd].type)
commUnsetNonBlocking(unlinkd_wfd);
- debug(2, 1) ("Unlinkd pipe opened on FD %d\n", unlinkd_wfd);
+
+ debugs(2, DBG_IMPORTANT, "Unlinkd pipe opened on FD " << unlinkd_wfd);
+
+#if _SQUID_WINDOWS_
+
+ debugs(2, 4, "Unlinkd handle: 0x" << std::hex << hIpc << std::dec << ", PID: " << pid);
+
+#endif
+
}
+#endif /* USE_UNLINKD */
-#endif /* ndef UNLINK_DAEMON */
projects / thirdparty / squid.git / blobdiff