1/* Copyright (C) 1995-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/msg.h>
20#include <ipc_priv.h>
21#include <sysdep.h>
22#include <errno.h>
23
24/* Attach the shared memory segment associated with SHMID to the data
25 segment of the calling process. SHMADDR and SHMFLG determine how
26 and where the segment is attached. */
27
28void *
29shmat (int shmid, const void *shmaddr, int shmflg)
30{
31#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
32 return (void*) INLINE_SYSCALL_CALL (shmat, shmid, shmaddr, shmflg);
33#else
34 unsigned long resultvar;
35 void *raddr;
36
37 resultvar = INTERNAL_SYSCALL_CALL (ipc, IPCOP_shmat, shmid, shmflg,
38 &raddr, shmaddr);
39 if (INTERNAL_SYSCALL_ERROR_P (resultvar))
40 return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (resultvar));
41
42 return raddr;
43#endif
44}
45