/* Check for any fds we need to close.
* - If fd_to_ignore != -1, then if we find that fd open we will ignore it.
* - By default we warn about open fds we find.
* - If closeall is true, we will close open fds.
* - If lxc-start was passed "-C", then conf->close_all_fds will be true, in
* which case we also close all open fds.
* - A daemonized container will always pass closeall=true.
*/
int lxc_check_inherited(struct lxc_conf *conf, bool closeall, int fd_to_ignore)
{
struct dirent *direntp;
int fd, fddir;
DIR *dir;
if (conf && conf->close_all_fds)
closeall = true;
restart:
dir = opendir("/proc/self/fd");
if (!dir) {
WARN("Failed to open directory: %m.");
return -1;
}
fddir = dirfd(dir);
while ((direntp = readdir(dir))) {
if (!direntp)
break;
if (!strcmp(direntp->d_name, "."))
continue;
if (!strcmp(direntp->d_name, ".."))
continue;
if (lxc_safe_int(direntp->d_name, &fd) < 0) {
INFO("Could not parse file descriptor for: %s", direntp->d_name);
continue;
}
if (fd == fddir || fd == lxc_log_fd || fd == fd_to_ignore)
continue;
if (current_config && fd == current_config->logfd)
continue;
if (match_fd(fd))
continue;
if (closeall) {
close(fd);
closedir(dir);
INFO("Closed inherited fd: %d.", fd);
goto restart;
}
WARN("Inherited fd: %d.", fd);
}
/* Only enable syslog at this point to avoid the above logging function
* to open a new fd and make the check_inherited function enter an
* infinite loop.
*/
lxc_log_enable_syslog();
closedir(dir); /* cannot fail */
return 0;
}
/*
* Check for any fds we need to close
* * if fd_to_ignore != -1, then if we find that fd open we will ignore it.
* * By default we warn about open fds we find.
* * If closeall is true, we will close open fds.
* * If lxc-start was passed "-C", then conf->close_all_fds will be true,
* in which case we also close all open fds.
* * A daemonized container will always pass closeall=true.
*/
int lxc_check_inherited(struct lxc_conf *conf, bool closeall, int fd_to_ignore)
{
struct dirent dirent, *direntp;
int fd, fddir;
DIR *dir;
if (conf && conf->close_all_fds)
closeall = true;
restart:
dir = opendir("/proc/self/fd");
if (!dir) {
WARN("failed to open directory: %m");
return -1;
}
fddir = dirfd(dir);
while (!readdir_r(dir, &dirent, &direntp)) {
if (!direntp)
break;
if (!strcmp(direntp->d_name, "."))
continue;
if (!strcmp(direntp->d_name, ".."))
continue;
fd = atoi(direntp->d_name);
if (fd == fddir || fd == lxc_log_fd || fd == fd_to_ignore)
continue;
if (current_config && fd == current_config->logfd)
continue;
if (match_fd(fd))
continue;
if (closeall) {
close(fd);
closedir(dir);
INFO("closed inherited fd %d", fd);
goto restart;
}
WARN("inherited fd %d", fd);
}
closedir(dir); /* cannot fail */
return 0;
}
int lxc_check_inherited(struct lxc_conf *conf, int fd_to_ignore)
{
struct dirent *direntp;
int fd, fddir;
DIR *dir;
restart:
dir = opendir("/proc/self/fd");
if (!dir) {
WARN("failed to open directory: %m");
return -1;
}
fddir = dirfd(dir);
while ((direntp = readdir(dir))) {
if (!direntp)
break;
if (!strcmp(direntp->d_name, "."))
continue;
if (!strcmp(direntp->d_name, ".."))
continue;
fd = atoi(direntp->d_name);
if (fd == fddir || fd == lxc_log_fd || fd == fd_to_ignore)
continue;
if (match_fd(fd))
continue;
if (conf == NULL || conf->close_all_fds) {
close(fd);
closedir(dir);
INFO("closed inherited fd %d", fd);
goto restart;
}
WARN("inherited fd %d", fd);
}
closedir(dir); /* cannot fail */
return 0;
}
