mirror of
git://sourceware.org/git/lvm2.git
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4cc5adf46c
(Jan Friesse)
204 lines
4.5 KiB
C
204 lines
4.5 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of the device-mapper userspace tools.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "dmlib.h"
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#include <sys/file.h>
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#include <fcntl.h>
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#include <dirent.h>
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static int _create_dir_recursive(const char *dir)
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{
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char *orig, *s;
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int rc, r = 0;
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log_verbose("Creating directory \"%s\"", dir);
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/* Create parent directories */
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orig = s = dm_strdup(dir);
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while ((s = strchr(s, '/')) != NULL) {
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*s = '\0';
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if (*orig) {
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rc = mkdir(orig, 0777);
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if (rc < 0 && errno != EEXIST) {
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if (errno != EROFS)
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log_sys_error("mkdir", orig);
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goto out;
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}
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}
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*s++ = '/';
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}
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/* Create final directory */
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rc = mkdir(dir, 0777);
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if (rc < 0 && errno != EEXIST) {
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if (errno != EROFS)
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log_sys_error("mkdir", orig);
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goto out;
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}
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r = 1;
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out:
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dm_free(orig);
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return r;
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}
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int dm_create_dir(const char *dir)
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{
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struct stat info;
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if (!*dir)
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return 1;
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if (stat(dir, &info) < 0)
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return _create_dir_recursive(dir);
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if (S_ISDIR(info.st_mode))
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return 1;
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log_error("Directory \"%s\" not found", dir);
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return 0;
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}
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int dm_fclose(FILE *stream)
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{
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int prev_fail = ferror(stream);
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int fclose_fail = fclose(stream);
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/* If there was a previous failure, but fclose succeeded,
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clear errno, since ferror does not set it, and its value
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may be unrelated to the ferror-reported failure. */
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if (prev_fail && !fclose_fail)
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errno = 0;
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return prev_fail || fclose_fail ? EOF : 0;
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}
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int dm_create_lockfile(const char *lockfile)
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{
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int fd, value;
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size_t bufferlen;
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ssize_t write_out;
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struct flock lock;
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char buffer[50];
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if((fd = open(lockfile, O_CREAT | O_WRONLY,
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(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) < 0) {
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log_error("Cannot open lockfile [%s], error was [%s]",
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lockfile, strerror(errno));
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return 0;
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}
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lock.l_type = F_WRLCK;
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lock.l_start = 0;
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lock.l_whence = SEEK_SET;
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lock.l_len = 0;
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retry_fcntl:
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if (fcntl(fd, F_SETLK, &lock) < 0) {
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switch (errno) {
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case EINTR:
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goto retry_fcntl;
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break;
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case EACCES:
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case EAGAIN:
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log_error("Cannot lock lockfile [%s], error was [%s]",
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lockfile, strerror(errno));
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break;
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default:
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log_error("process is already running");
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}
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goto fail_close;
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}
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if (ftruncate(fd, 0) < 0) {
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log_error("Cannot truncate pidfile [%s], error was [%s]",
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lockfile, strerror(errno));
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goto fail_close_unlink;
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}
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memset(buffer, 0, sizeof(buffer));
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snprintf(buffer, sizeof(buffer)-1, "%u\n", getpid());
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bufferlen = strlen(buffer);
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write_out = write(fd, buffer, bufferlen);
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if ((write_out < 0) || (write_out == 0 && errno)) {
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log_error("Cannot write pid to pidfile [%s], error was [%s]",
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lockfile, strerror(errno));
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goto fail_close_unlink;
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}
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if ((write_out == 0) || (write_out < bufferlen)) {
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log_error("Cannot write pid to pidfile [%s], shortwrite of"
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"[%" PRIsize_t "] bytes, expected [%" PRIsize_t "]\n",
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lockfile, write_out, bufferlen);
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goto fail_close_unlink;
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}
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if ((value = fcntl(fd, F_GETFD, 0)) < 0) {
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log_error("Cannot get close-on-exec flag from pidfile [%s], "
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"error was [%s]", lockfile, strerror(errno));
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goto fail_close_unlink;
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}
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value |= FD_CLOEXEC;
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if (fcntl(fd, F_SETFD, value) < 0) {
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log_error("Cannot set close-on-exec flag from pidfile [%s], "
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"error was [%s]", lockfile, strerror(errno));
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goto fail_close_unlink;
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}
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return 1;
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fail_close_unlink:
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if (unlink(lockfile))
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stack;
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fail_close:
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if (close(fd))
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stack;
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return 0;
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}
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int dm_daemon_is_running(const char* lockfile)
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{
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int fd;
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struct flock lock;
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if((fd = open(lockfile, O_RDONLY)) < 0)
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return 0;
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lock.l_type = F_WRLCK;
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lock.l_start = 0;
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lock.l_whence = SEEK_SET;
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lock.l_len = 0;
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if (fcntl(fd, F_GETLK, &lock) < 0) {
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log_error("Cannot check lock status of lockfile [%s], error was [%s]",
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lockfile, strerror(errno));
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if (close(fd))
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stack;
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return 0;
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}
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if (close(fd))
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stack;
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return (lock.l_type == F_UNLCK) ? 0 : 1;
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}
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