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/*
* util.c - utilities used in lsfd
*
* Copyright (C) 2021-2026 Red Hat, Inc. All rights reserved.
* Written by Masatake YAMATO <yamato@redhat.com>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would 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, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lsfd.h" /* prototype decl for call_with_foreign_fd */
#include "pidfd-utils.h"
int call_with_foreign_fd_via_pidfd(int pidfd, int target_fd,
int (*fn)(int, void*), void *data)
{
int tfd, r;
tfd = pidfd_getfd(pidfd, target_fd, 0);
if (tfd < 0)
return tfd;
r = fn(tfd, data);
close(tfd);
return r;
}
int call_with_foreign_fd(pid_t target_pid, int target_fd,
int (*fn)(int, void*), void *data)
{
int pidfd, r;
pidfd = pidfd_open(target_pid, 0);
if (pidfd < 0)
return pidfd;
r = call_with_foreign_fd_via_pidfd(pidfd, target_fd, fn, data);
close(pidfd);
return r;
}
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