108 lines
1.9 KiB
C
108 lines
1.9 KiB
C
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#define _SYSTEM 1
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#define _MINIX 1
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/ipc.h>
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#include <minix/endpoint.h>
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#include <minix/sysutil.h>
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#include <minix/const.h>
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#include <minix/type.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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PRIVATE 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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/* Shared memory control operation. */
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PUBLIC int shmctl(int shmid, int cmd, struct shmid_ds *buf)
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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 -1;
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}
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m.SHMCTL_ID = shmid;
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m.SHMCTL_CMD = cmd;
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m.SHMCTL_BUF = (long) buf;
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r = _syscall(ipc_pt, IPC_SHMCTL, &m);
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if ((cmd == IPC_INFO || cmd == SHM_INFO || cmd == SHM_STAT)
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&& (r == OK))
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return m.SHMCTL_RET;
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return r;
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}
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/* Get shared memory segment. */
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PUBLIC int shmget(key_t key, size_t size, 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 -1;
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}
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m.SHMGET_KEY = key;
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m.SHMGET_SIZE = size;
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m.SHMGET_FLAG = shmflg;
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r = _syscall(ipc_pt, IPC_SHMGET, &m);
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if (r != OK)
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return r;
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return m.SHMGET_RETID;
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}
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/* Attach shared memory segment. */
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PUBLIC 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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PUBLIC 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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