104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
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/*-
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* Copyright (c) 2012 Juan Romero Pardines.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <libgen.h>
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#include <assert.h>
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#include <xbps_api.h>
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#include "defs.h"
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int
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acquire_repo_lock(const char *plist, char **plist_lock)
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{
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int try = 0, fd = -1;
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*plist_lock = xbps_xasprintf("%s.lock", plist);
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assert(*plist_lock);
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fd = open(*plist_lock, O_RDWR);
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if (fd == -1) {
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if (errno == ENOENT) {
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fd = creat(*plist_lock, 0640);
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if (fd == -1) {
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fprintf(stderr, "Failed to create "
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"repository file lock: %s\n",
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strerror(errno));
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return -1;
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}
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} else {
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fprintf(stderr, "Failed to open repository "
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"file lock: %s\n", strerror(errno));
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return -1;
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}
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}
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/*
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* Acquire the the exclusive file lock or wait until
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* it's available.
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*/
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#define WAIT_SECONDS 30
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while (lockf(fd, F_TLOCK, 0) < 0) {
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if (errno == EAGAIN || errno == EACCES) {
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if (++try < WAIT_SECONDS) {
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fprintf(stderr,"Repository index file "
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"is busy! retrying in 5 sec...\n");
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sleep(5);
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continue;
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}
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}
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fprintf(stderr, "Failed to acquire repository "
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"file lock in %d seconds!\n", WAIT_SECONDS);
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close(fd);
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return -1;
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}
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return fd;
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}
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void
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release_repo_lock(char **plist_lock, int fd)
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{
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assert(*plist_lock);
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if (fd == -1)
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return;
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if (lockf(fd, F_ULOCK, 0) == -1) {
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fprintf(stderr, "failed to unlock file lock: %s\n",
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strerror(errno));
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close(fd);
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exit(EXIT_FAILURE);
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}
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close(fd);
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unlink(*plist_lock);
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free(*plist_lock);
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}
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