xref: /minix3/minix/lib/libc/sys/shmget.c (revision 433d6423c39e34ec4b79c950597bb2d236f886be)
1*433d6423SLionel Sambuc #define _SYSTEM	1
2*433d6423SLionel Sambuc 
3*433d6423SLionel Sambuc #include <sys/cdefs.h>
4*433d6423SLionel Sambuc #include <lib.h>
5*433d6423SLionel Sambuc #include "namespace.h"
6*433d6423SLionel Sambuc 
7*433d6423SLionel Sambuc #include <minix/rs.h>
8*433d6423SLionel Sambuc #include <sys/types.h>
9*433d6423SLionel Sambuc #include <sys/ipc.h>
10*433d6423SLionel Sambuc #include <sys/shm.h>
11*433d6423SLionel Sambuc #include <stdlib.h>
12*433d6423SLionel Sambuc #include <errno.h>
13*433d6423SLionel Sambuc #include <string.h>
14*433d6423SLionel Sambuc 
get_ipc_endpt(endpoint_t * pt)15*433d6423SLionel Sambuc static int get_ipc_endpt(endpoint_t *pt)
16*433d6423SLionel Sambuc {
17*433d6423SLionel Sambuc 	return minix_rs_lookup("ipc", pt);
18*433d6423SLionel Sambuc }
19*433d6423SLionel Sambuc 
20*433d6423SLionel Sambuc /* Get shared memory segment. */
shmget(key_t key,size_t size,int shmflg)21*433d6423SLionel Sambuc int shmget(key_t key, size_t size, int shmflg)
22*433d6423SLionel Sambuc {
23*433d6423SLionel Sambuc 	message m;
24*433d6423SLionel Sambuc 	endpoint_t ipc_pt;
25*433d6423SLionel Sambuc 	int r;
26*433d6423SLionel Sambuc 
27*433d6423SLionel Sambuc 	if (get_ipc_endpt(&ipc_pt) != OK) {
28*433d6423SLionel Sambuc 		errno = ENOSYS;
29*433d6423SLionel Sambuc 		return -1;
30*433d6423SLionel Sambuc 	}
31*433d6423SLionel Sambuc 
32*433d6423SLionel Sambuc 	memset(&m, 0, sizeof(m));
33*433d6423SLionel Sambuc 	m.m_lc_ipc_shmget.key = key;
34*433d6423SLionel Sambuc 	m.m_lc_ipc_shmget.size = size;
35*433d6423SLionel Sambuc 	m.m_lc_ipc_shmget.flag = shmflg;
36*433d6423SLionel Sambuc 
37*433d6423SLionel Sambuc 	r = _syscall(ipc_pt, IPC_SHMGET, &m);
38*433d6423SLionel Sambuc 	if (r != OK)
39*433d6423SLionel Sambuc 		return r;
40*433d6423SLionel Sambuc 	return m.m_lc_ipc_shmget.retid;
41*433d6423SLionel Sambuc }
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