1/* Copyright (C) 1995-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <ipc_priv.h>
19#include <sysdep.h>
20#include <errno.h>
21
22/* Attach the shared memory segment associated with SHMID to the data
23 segment of the calling process. SHMADDR and SHMFLG determine how
24 and where the segment is attached. */
25
26void *
27shmat (int shmid, const void *shmaddr, int shmflg)
28{
29#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
30 return (void*) INLINE_SYSCALL_CALL (shmat, shmid, shmaddr, shmflg);
31#else
32 unsigned long resultvar;
33 void *raddr;
34
35 resultvar = INTERNAL_SYSCALL_CALL (ipc, IPCOP_shmat, shmid, shmflg,
36 &raddr, shmaddr);
37 if (INTERNAL_SYSCALL_ERROR_P (resultvar))
38 return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (resultvar));
39
40 return raddr;
41#endif
42}
43