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[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / sendmsg.c

diff --git a/sysdeps/unix/sysv/linux/sendmsg.c b/sysdeps/unix/sysv/linux/sendmsg.c
index 16774c48b157a1d1cc6aeeead1bc400623d9aa15..42c4250749393d33eb2b202368e9cea607a4da6e 100644 (file)
--- a/sysdeps/unix/sysv/linux/sendmsg.c
+++ b/sysdeps/unix/sysv/linux/sendmsg.c
@@ -1,91 +1,34 @@
-/* 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
+ssize_t
+__libc_sendmsg (int fd, const struct msghdr *msg, int flags)
 {
-  __kernel_pid_t pid;
-  __kernel_uid_t uid;
-  __kernel_gid_t gid;
-};
-
-extern int __syscall_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
-__libc_sendmsg (int fd, const struct msghdr *message, 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 __syscall_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)
+weak_alias (__libc_sendmsg, __sendmsg)