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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.
97 lines
2.5 KiB
C
97 lines
2.5 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 <string.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_recvmsg (int, struct msghdr *, int);
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int
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__libc_recvmsg (fd, message, flags)
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int fd;
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struct msghdr *message;
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int flags;
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{
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struct cmsghdr *cm;
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int ret;
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int found_creds = 0;
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/* Must check for space first. */
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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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found_creds = 1;
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}
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cm = CMSG_NXTHDR (message, cm);
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}
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ret = __syscall_recvmsg (fd, message, flags);
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if (ret == -1)
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return ret;
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/* Postprocess the message control block for SCM_CREDS. */
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cm = CMSG_FIRSTHDR (message);
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if (found_creds)
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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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struct cmsgcred *c = (struct cmsgcred *) CMSG_DATA (cm);
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struct __kernel_ucred u;
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int i;
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memcpy (&u, CMSG_DATA (cm), sizeof (struct __kernel_ucred));
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c->cmcred_pid = u.pid;
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c->cmcred_uid = u.uid;
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c->cmcred_gid = u.gid;
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c->cmcred_euid = -1;
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c->cmcred_ngroups = 0;
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for (i = 0; i < CMGROUP_MAX; i++)
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c->cmcred_groups[i] = -1;
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}
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cm = CMSG_NXTHDR (message, cm);
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}
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return ret;
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}
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weak_alias (__libc_recvmsg, __recvmsg)
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weak_alias (__libc_recvmsg, recvmsg)
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