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dd3c89f99c
1998-07-05 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/__sendmsg.S: Define function as __syscall_sendmsg. * sysdeps/unix/sysv/linux/__recvmsg.S: Define function as __syscall_recvmsg. * sysdeps/unix/sysv/linux/recvmsg.c: Define function as __libc_recvmsg and make __recvmsg and recvmsg weak aliases. * sysdeps/unix/sysv/linux/sendmsg.c: Likewise for sendmsg. * sysdeps/unix/sysv/linux/alpha/syscalls.list: Define __syscall_recvmsg and __syscall_sendmsg.
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/socket.h>
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#include <errno.h>
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#include <unistd.h>
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#include <asm/posix_types.h>
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/* The kernel expects this structure in SCM_CREDS messages.
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* Note: sizeof(struct __kernel_ucred) <= sizeof(struct cmsgcred) must hold.
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*/
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struct __kernel_ucred
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{
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__kernel_pid_t pid;
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__kernel_uid_t uid;
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__kernel_gid_t gid;
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};
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extern int __syscall_sendmsg (int, const struct msghdr *, int);
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/* Send a message described by MESSAGE on socket FD.
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Returns the number of bytes sent, or -1 for errors. */
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int
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__libc_sendmsg (fd, message, flags)
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int fd;
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const struct msghdr *message;
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int flags;
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{
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struct cmsghdr *cm;
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struct cmsgcred *cc;
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struct __kernel_ucred *u;
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pid_t pid;
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/* Preprocess the message control block for SCM_CREDS. */
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cm = CMSG_FIRSTHDR (message);
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while (cm)
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{
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if (cm->cmsg_type == SCM_CREDS)
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{
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if (cm->cmsg_len < CMSG_SPACE (sizeof (struct cmsgcred)))
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{
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__set_errno (EINVAL);
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return -1;
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}
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u = (struct __kernel_ucred *) CMSG_DATA (cm);
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cc = (struct cmsgcred *) CMSG_DATA (cm);
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/* Linux expects the calling process to pass in
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its credentials, and sanity checks them.
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You can send real, effective, or set- uid and gid.
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If the user hasn't filled in the buffer, we default to
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real uid and gid. */
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pid = getpid ();
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if (cc->cmcred_pid != pid)
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{
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u->pid = pid;
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u->uid = getuid ();
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u->gid = getgid ();
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}
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else
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{
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struct __kernel_ucred v;
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v.pid = cc->cmcred_pid;
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v.uid = cc->cmcred_uid;
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v.gid = cc->cmcred_gid;
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u->pid = v.pid;
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u->uid = v.uid;
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u->gid = v.gid;
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}
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}
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cm = CMSG_NXTHDR ((struct msghdr *) message, cm);
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}
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return __syscall_sendmsg (fd, message, flags);
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}
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weak_alias (__libc_sendmsg, __sendmsg)
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weak_alias (__libc_sendmsg, sendmsg)
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