-/* Copyright (C) 1998 Free Software Foundation, Inc.
+/* Compatibility implementation of sendmsg.
+ Copyright (C) 2016-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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.
The GNU C 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#include <sys/socket.h>
-#include <errno.h>
-#include <unistd.h>
+#include <sysdep-cancel.h>
+#include <socketcall.h>
+#include <shlib-compat.h>
-#include <asm/posix_types.h>
-
-/* The kernel expects this structure in SCM_CREDS messages.
- * Note: sizeof(struct __kernel_ucred) <= sizeof(struct cmsgcred) must hold.
- */
-struct __kernel_ucred
-{
- __kernel_pid_t pid;
- __kernel_uid_t uid;
- __kernel_gid_t gid;
-};
-
-extern int __sendmsg (int, const struct msghdr *, int);
-
-/* Send a message described by MESSAGE on socket FD.
- Returns the number of bytes sent, or -1 for errors. */
-int
-sendmsg (fd, message, flags)
- int fd;
- const struct msghdr *message;
- int flags;
+ssize_t
+__libc_sendmsg (int fd, const struct msghdr *msg, int flags)
{
- struct cmsghdr *cm;
- struct cmsgcred *cc;
- struct __kernel_ucred *u;
- pid_t pid;
-
- /* Preprocess the message control block for SCM_CREDS. */
- cm = CMSG_FIRSTHDR (message);
- while (cm)
- {
- if (cm->cmsg_type == SCM_CREDS)
- {
- if (cm->cmsg_len < CMSG_SPACE (sizeof (struct cmsgcred)))
- {
- __set_errno (EINVAL);
- return -1;
- }
-
- u = (struct __kernel_ucred *) CMSG_DATA (cm);
- cc = (struct cmsgcred *) CMSG_DATA (cm);
- /* Linux expects the calling process to pass in
- its credentials, and sanity checks them.
- You can send real, effective, or set- uid and gid.
- If the user hasn't filled in the buffer, we default to
- real uid and gid. */
- pid = getpid ();
- if (cc->cmcred_pid != pid)
- {
- u->pid = pid;
- u->uid = getuid ();
- u->gid = getgid ();
- }
- else
- {
- struct __kernel_ucred v;
- v.pid = cc->cmcred_pid;
- v.uid = cc->cmcred_uid;
- v.gid = cc->cmcred_gid;
- u->pid = v.pid;
- u->uid = v.uid;
- u->gid = v.gid;
- }
- }
- cm = CMSG_NXTHDR ((struct msghdr *) message, cm);
- }
-
- return __sendmsg (fd, message, flags);
+# ifdef __ASSUME_SENDMSG_SYSCALL
+ return SYSCALL_CANCEL (sendmsg, fd, msg, flags);
+# else
+ return SOCKETCALL_CANCEL (sendmsg, fd, msg, flags);
+# endif
}
+weak_alias (__libc_sendmsg, sendmsg)
+weak_alias (__libc_sendmsg, __sendmsg)