64 lines
1 KiB
C
64 lines
1 KiB
C
#define _SYSTEM 1
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#include <sys/cdefs.h>
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#include <lib.h>
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#include "namespace.h"
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#include <minix/rs.h>
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#include <lib.h>
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifdef __weak_alias
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__weak_alias(shmat, _shmat)
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__weak_alias(shmdt, _shmdt)
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#endif
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static int get_ipc_endpt(endpoint_t *pt)
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{
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return minix_rs_lookup("ipc", pt);
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}
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/* Attach shared memory segment. */
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void *shmat(int shmid, const void *shmaddr, int shmflg)
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{
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message m;
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endpoint_t ipc_pt;
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int r;
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if (get_ipc_endpt(&ipc_pt) != OK) {
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errno = ENOSYS;
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return NULL;
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}
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m.SHMAT_ID = shmid;
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m.SHMAT_ADDR = (long) shmaddr;
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m.SHMAT_FLAG = shmflg;
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r = _syscall(ipc_pt, IPC_SHMAT, &m);
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if (r != OK)
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return (void *) -1;
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return (void *) m.SHMAT_RETADDR;
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}
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/* Deattach shared memory segment. */
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int shmdt(const void *shmaddr)
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{
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message m;
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endpoint_t ipc_pt;
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if (get_ipc_endpt(&ipc_pt) != OK) {
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errno = ENOSYS;
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return -1;
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}
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m.SHMDT_ADDR = (long) shmaddr;
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return _syscall(ipc_pt, IPC_SHMDT, &m);
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}
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