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/* sem.cc: XSI IPC interface for Cygwin.
Copyright 2003 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygerrno.h"
#include <signal.h>
#ifdef USE_SERVER
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include "sigproc.h"
#include "cygserver_ipc.h"
#include "cygserver_sem.h"
/*
* client_request_sem Constructors
*/
client_request_sem::client_request_sem (int semid,
int semnum,
int cmd,
union semun *arg)
: client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
{
_parameters.in.semop = SEMOP_semctl;
ipc_set_proc_info (_parameters.in.ipcblk);
_parameters.in.ctlargs.semid = semid;
_parameters.in.ctlargs.semnum = semnum;
_parameters.in.ctlargs.cmd = cmd;
_parameters.in.ctlargs.arg = arg;
msglen (sizeof (_parameters.in));
}
client_request_sem::client_request_sem (key_t key,
int nsems,
int semflg)
: client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
{
_parameters.in.semop = SEMOP_semget;
ipc_set_proc_info (_parameters.in.ipcblk);
_parameters.in.getargs.key = key;
_parameters.in.getargs.nsems = nsems;
_parameters.in.getargs.semflg = semflg;
msglen (sizeof (_parameters.in));
}
client_request_sem::client_request_sem (int semid,
struct sembuf *sops,
size_t nsops)
: client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
{
_parameters.in.semop = SEMOP_semop;
ipc_set_proc_info (_parameters.in.ipcblk);
_parameters.in.opargs.semid = semid;
_parameters.in.opargs.sops = sops;
_parameters.in.opargs.nsops = nsops;
msglen (sizeof (_parameters.in));
}
#endif /* USE_SERVER */
/*
* XSI semaphore API. These are exported by the DLL.
*/
extern "C" int
semctl (int semid, int semnum, int cmd, ...)
{
#ifdef USE_SERVER
union semun arg = {0};
if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO || cmd == SEM_INFO
|| cmd == GETALL || cmd == SETALL || cmd == SETVAL)
{
va_list ap;
va_start (ap, cmd);
arg = va_arg (ap, union semun);
va_end (ap);
}
syscall_printf ("semctl (semid = %d, semnum = %d, cmd = %d, arg.val = 0x%x)",
semid, semnum, cmd, arg.val);
if ((cmd == IPC_STAT || cmd == IPC_SET)
&& __check_null_invalid_struct_errno (arg.buf, sizeof (struct semid_ds)))
return -1;
if (cmd == IPC_INFO)
{
/* semid == 0: Request for seminfo struct. */
if (!semid
&& __check_null_invalid_struct_errno (arg.buf, sizeof (struct seminfo)))
return -1;
/* Otherwise, request semid entries from internal semid_ds array. */
if (semid)
if (__check_null_invalid_struct_errno (arg.buf, semid * sizeof (struct semid_ds)))
return -1;
}
if (cmd == SEM_INFO
&& __check_null_invalid_struct_errno (arg.buf, sizeof (struct sem_info)))
return -1;
client_request_sem request (semid, semnum, cmd, &arg);
if (request.make_request () == -1 || request.retval () == -1)
{
syscall_printf ("-1 [%d] = semctl ()", request.error_code ());
set_errno (request.error_code ());
if (request.error_code () == ENOSYS)
raise (SIGSYS);
return -1;
}
return request.retval ();
#else
set_errno (ENOSYS);
raise (SIGSYS);
return -1;
#endif
}
extern "C" int
semget (key_t key, int nsems, int semflg)
{
#ifdef USE_SERVER
syscall_printf ("semget (key = %U, nsems = %d, semflg = 0x%x)",
key, nsems, semflg);
client_request_sem request (key, nsems, semflg);
if (request.make_request () == -1 || request.retval () == -1)
{
syscall_printf ("-1 [%d] = semget ()", request.error_code ());
set_errno (request.error_code ());
if (request.error_code () == ENOSYS)
raise (SIGSYS);
return -1;
}
return request.retval ();
#else
set_errno (ENOSYS);
raise (SIGSYS);
return -1;
#endif
}
extern "C" int
semop (int semid, struct sembuf *sops, size_t nsops)
{
#ifdef USE_SERVER
syscall_printf ("semop (semid = %d, sops = %p, nsops = %d)",
semid, sops, nsops);
if (__check_null_invalid_struct_errno (sops, nsops * sizeof (struct sembuf)))
return -1;
client_request_sem request (semid, sops, nsops);
if (request.make_request () == -1 || request.retval () == -1)
{
syscall_printf ("-1 [%d] = semop ()", request.error_code ());
set_errno (request.error_code ());
if (request.error_code () == ENOSYS)
raise (SIGSYS);
return -1;
}
return request.retval ();
#else
set_errno (ENOSYS);
raise (SIGSYS);
return -1;
#endif
}
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