unlinkd.c

-

/*
 * $Id: unlinkd.c,v 1.29.2.1 1999/04/19 19:18:30 wessels Exp $
 *
 * DEBUG: section 12    Unlink Daemon
 * AUTHOR: Duane Wessels
 *
 * SQUID Internet Object Cache  http://squid.nlanr.net/Squid/
 * ----------------------------------------------------------
 *
 *  Squid is the result of efforts by numerous individuals from the
 *  Internet community.  Development is led by Duane Wessels of the
 *  National Laboratory for Applied Network Research and funded by the
 *  National Science Foundation.  Squid is Copyrighted (C) 1998 by
 *  Duane Wessels and the University of California San Diego.  Please
 *  see the COPYRIGHT file for full details.  Squid incorporates
 *  software developed and/or copyrighted by other sources.  Please 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.
 *
 */

#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;
    setbuf(stdin, NULL);
    while (fgets(buf, UNLINK_BUF_LEN, stdin)) {
	if ((t = strchr(buf, '\n')))
	    *t = '\0';
#if USE_TRUNCATE_NOT_UNLINK
	truncate(buf, 0);
#else
	unlink(buf);
#endif
    }
    exit(0);
}

#else /* UNLINK_DAEMON */

/* This code gets linked to Squid */

#if USE_UNLINKD
static int unlinkd_wfd = -1;
static int unlinkd_rfd = -1;
#endif

void
unlinkdUnlink(const char *path)
{
#if USE_UNLINKD
    char *buf;
    int l;
    if (unlinkd_wfd < 0) {
	debug_trap("unlinkdUnlink: unlinkd_wfd < 0");
	safeunlink(path, 0);
	return;
    }
    l = strlen(path) + 1;
    buf = xcalloc(1, l + 1);
    strcpy(buf, path);
    strcat(buf, "\n");
    file_write(unlinkd_wfd,
	-1,
	buf,
	l,
	NULL,			/* Handler */
	NULL,			/* Handler-data */
	xfree);
    Counter.unlink.requests++;
#endif
}

void
unlinkdClose(void)
{
#if USE_UNLINKD
    assert(unlinkd_wfd > -1);
    debug(12, 1) ("Closing unlinkd pipe on FD %d\n", unlinkd_wfd);
    file_close(unlinkd_wfd);
    if (unlinkd_wfd != unlinkd_rfd)
	file_close(unlinkd_rfd);
    unlinkd_wfd = -1;
    unlinkd_rfd = -1;
#endif
}

void
unlinkdInit(void)
{
#if USE_UNLINKD
    int x;
    char *args[2];
    struct timeval slp;
    args[0] = "(unlinkd)";
    args[1] = NULL;
#if HAVE_POLL && defined(_SQUID_OSF_)
    /* pipes and poll() don't get along on DUNIX -DW */
    x = ipcCreate(IPC_TCP_SOCKET,
#else
    x = ipcCreate(IPC_FIFO,
#endif
	Config.Program.unlinkd,
	args,
	"unlinkd",
	&unlinkd_rfd,
	&unlinkd_wfd);
    if (x < 0)
	fatal("Failed to create unlinkd subprocess");
    slp.tv_sec = 0;
    slp.tv_usec = 250000;
    select(0, NULL, NULL, NULL, &slp);
    fd_note(unlinkd_wfd, "squid -> unlinkd");
    fd_note(unlinkd_rfd, "unlinkd -> squid");
    commSetTimeout(unlinkd_rfd, -1, NULL, NULL);
    commSetTimeout(unlinkd_wfd, -1, NULL, NULL);
    commSetNonBlocking(unlinkd_wfd);
    commSetNonBlocking(unlinkd_rfd);
    debug(12, 1) ("Unlinkd pipe opened on FD %d\n", unlinkd_wfd);
#endif
}

#endif /* ndef UNLINK_DAEMON */