minix/lib/nbsd_libc/sys-minix/sem.c
Gianluca Guida 4f294c247f Add NBSDLibc Minix specific files.
This patch mainly copies and modifies files existing in
the current libc implementing minix specific functions.

To keep consisten with the NetBSD libc, we remove 
namespace stubs and we use "namespace.h" and weak
links.
2011-02-17 17:11:09 +00:00

99 lines
1.8 KiB
C

#define __USE_MISC
#define _SYSTEM 1
#define _MINIX 1
#include <sys/cdefs.h>
#include <lib.h>
#include "namespace.h"
#include <lib.h>
#include <minix/rs.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#ifdef __weak_alias
__weak_alias(sem, _sem)
#endif
static int get_ipc_endpt(endpoint_t *pt)
{
return minix_rs_lookup("ipc", pt);
}
/* Get semaphore. */
int semget(key_t key, int nsems, int semflag)
{
message m;
endpoint_t ipc_pt;
int r;
if (get_ipc_endpt(&ipc_pt) != OK) {
errno = ENOSYS;
return -1;
}
m.SEMGET_KEY = key;
m.SEMGET_NR = nsems;
m.SEMGET_FLAG = semflag;
r = _syscall(ipc_pt, IPC_SEMGET, &m);
if (r != OK)
return r;
return m.SEMGET_RETID;
}
/* Semaphore control operation. */
int semctl(int semid, int semnum, int cmd, ...)
{
message m;
endpoint_t ipc_pt;
va_list ap;
int r;
if (get_ipc_endpt(&ipc_pt) != OK) {
errno = ENOSYS;
return -1;
}
m.SEMCTL_ID = semid;
m.SEMCTL_NUM = semnum;
m.SEMCTL_CMD = cmd;
va_start(ap, cmd);
if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO ||
cmd == SEM_INFO || cmd == SEM_STAT || cmd == GETALL ||
cmd == SETALL || cmd == SETVAL)
m.SEMCTL_OPT = (long) va_arg(ap, long);
va_end(ap);
r = _syscall(ipc_pt, IPC_SEMCTL, &m);
if ((r != -1) && (cmd == GETNCNT || cmd == GETZCNT || cmd == GETPID ||
cmd == GETVAL || cmd == IPC_INFO || cmd == SEM_INFO ||
cmd == SEM_STAT))
return m.SHMCTL_RET;
return r;
}
/* Operate on semaphore. */
int semop(int semid, struct sembuf *sops, size_t nsops)
{
message m;
endpoint_t ipc_pt;
if (get_ipc_endpt(&ipc_pt) != OK) {
errno = ENOSYS;
return -1;
}
m.SEMOP_ID = semid;
m.SEMOP_OPS = (long) sops;
m.SEMOP_SIZE = nsops;
return _syscall(ipc_pt, IPC_SEMOP, &m);
}