mirror of https://gitee.com/openkylin/glib2.0.git
118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/* glib-unixprivate.h - Unix specific integration private functions
|
|
*
|
|
* SPDX-License-Identifier: LGPL-2.1-or-later
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef __G_UNIXPRIVATE_H__
|
|
#define __G_UNIXPRIVATE_H__
|
|
|
|
#include "config.h"
|
|
|
|
#ifndef G_OS_UNIX
|
|
#error "This header may only be used on UNIX"
|
|
#endif
|
|
|
|
/* To make bionic export pipe2() */
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE 1
|
|
#endif
|
|
|
|
#include "gmacros.h"
|
|
#include "gtypes.h"
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
static inline gboolean
|
|
g_unix_open_pipe_internal (int *fds,
|
|
gboolean close_on_exec,
|
|
gboolean nonblock)
|
|
{
|
|
#ifdef HAVE_PIPE2
|
|
do
|
|
{
|
|
int ecode;
|
|
int flags = 0;
|
|
|
|
if (close_on_exec)
|
|
flags |= O_CLOEXEC;
|
|
if (nonblock)
|
|
flags |= O_NONBLOCK;
|
|
|
|
/* Atomic */
|
|
ecode = pipe2 (fds, flags);
|
|
if (ecode == -1 && errno != ENOSYS)
|
|
return FALSE;
|
|
else if (ecode == 0)
|
|
return TRUE;
|
|
/* Fall through on -ENOSYS, we must be running on an old kernel */
|
|
}
|
|
while (FALSE);
|
|
#endif
|
|
|
|
if (pipe (fds) == -1)
|
|
return FALSE;
|
|
|
|
if (close_on_exec)
|
|
{
|
|
if (fcntl (fds[0], F_SETFD, FD_CLOEXEC) == -1 ||
|
|
fcntl (fds[1], F_SETFD, FD_CLOEXEC) == -1)
|
|
{
|
|
int saved_errno = errno;
|
|
|
|
close (fds[0]);
|
|
close (fds[1]);
|
|
fds[0] = -1;
|
|
fds[1] = -1;
|
|
|
|
errno = saved_errno;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
if (nonblock)
|
|
{
|
|
#ifdef O_NONBLOCK
|
|
int flags = O_NONBLOCK;
|
|
#else
|
|
int flags = O_NDELAY;
|
|
#endif
|
|
|
|
if (fcntl (fds[0], F_SETFL, flags) == -1 ||
|
|
fcntl (fds[1], F_SETFL, flags) == -1)
|
|
{
|
|
int saved_errno = errno;
|
|
|
|
close (fds[0]);
|
|
close (fds[1]);
|
|
fds[0] = -1;
|
|
fds[1] = -1;
|
|
|
|
errno = saved_errno;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __G_UNIXPRIVATE_H__ */
|