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- /*
- * libdpkg - Debian packaging suite library routines
- * lock.c - packages database locking
- *
- * Copyright © 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 this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <config.h>
- #include <compat.h>
- #include <sys/file.h>
- #include <assert.h>
- #include <errno.h>
- #include <string.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <dpkg/i18n.h>
- #include <dpkg/dpkg.h>
- #include <dpkg/dpkg-db.h>
- static void
- cu_unlock_file(int argc, void **argv)
- {
- int lockfd = *(int*)argv[0];
- struct flock fl;
- assert(lockfd >= 0);
- fl.l_type= F_UNLCK;
- fl.l_whence= SEEK_SET;
- fl.l_start= 0;
- fl.l_len= 0;
- if (fcntl(lockfd, F_SETLK, &fl) == -1)
- ohshite(_("unable to unlock dpkg status database"));
- }
- void
- unlock_file(void)
- {
- pop_cleanup(ehflag_normaltidy); /* Calls cu_unlock_file. */
- }
- /* lockfd must be allocated statically as its addresses is passed to
- * a cleanup handler. */
- void
- lock_file(int *lockfd, const char *filename,
- const char *emsg, const char *emsg_eagain)
- {
- struct flock fl;
- setcloexec(*lockfd, filename);
- fl.l_type = F_WRLCK;
- fl.l_whence = SEEK_SET;
- fl.l_start = 0;
- fl.l_len = 0;
- if (fcntl(*lockfd, emsg_eagain ? F_SETLK : F_SETLKW, &fl) == -1) {
- if (emsg_eagain && (errno == EACCES || errno == EAGAIN))
- ohshit(emsg_eagain);
- ohshite(emsg);
- }
- push_cleanup(cu_unlock_file, ~0, NULL, 0, 1, lockfd);
- }
- void
- unlockdatabase(void)
- {
- unlock_file();
- }
- void lockdatabase(const char *admindir) {
- static int dblockfd = -1;
- int n;
- 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"));
- }
- }
- lock_file(&dblockfd, dblockfile,
- _("unable to lock dpkg status database"),
- _("status database area is locked by another process"));
- free(dblockfile);
- }
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