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/*
* libdpkg - Debian packaging suite library routines
* lock.c - packages database locking
*
* Copyright (C) 1994,1995 Ian Jackson <ian@chiark.greenend.org.uk>
*
* This 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,
* or (at your option) any later version.
*
* This 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 dpkg; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <fcntl.h>
#include <sys/file.h>
#include <dpkg.h>
#include <dpkg-db.h>
static int dblockfd= -1;
static void cu_unlockdb(int argc, void **argv) {
struct flock fl;
assert(dblockfd >= 0);
fl.l_type= F_UNLCK;
fl.l_whence= SEEK_SET;
fl.l_start= 0;
fl.l_len= 0;
if (fcntl(dblockfd,F_SETLK,&fl) == -1)
ohshite(_("unable to unlock dpkg status database"));
}
void unlockdatabase(const char *admindir) {
pop_cleanup(ehflag_normaltidy); /* calls cu_unlockdb */
}
void lockdatabase(const char *admindir) {
int n;
struct flock fl;
char *dblockfile= NULL;
n= strlen(admindir);
dblockfile= m_malloc(n+sizeof(LOCKFILE)+2);
strcpy(dblockfile,admindir);
strcpy(dblockfile+n, "/" LOCKFILE);
if (dblockfd == -1) {
dblockfd= open(dblockfile, O_RDWR|O_CREAT|O_TRUNC, 0660);
if (dblockfd == -1) {
if (errno == EPERM)
ohshit(_("you do not have permission to lock the dpkg status database"));
ohshite(_("unable to open/create status database lockfile"));
}
}
fl.l_type= F_WRLCK;
fl.l_whence= SEEK_SET;
fl.l_start= 0;
fl.l_len= 0;
if (fcntl(dblockfd,F_SETLK,&fl) == -1) {
if (errno == EACCES || errno == EAGAIN)
ohshit(_("status database area is locked by another process"));
ohshite(_("unable to lock dpkg status database"));
}
setcloexec(dblockfd, dblockfile);
free(dblockfile);
push_cleanup(cu_unlockdb,~0, NULL,0, 0);
}
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