139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
/* sem.cc: XSI IPC interface for Cygwin.
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Copyright 2002, 2003, 2004, 2005, 2008, 2009, 2012 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include "sigproc.h"
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#include "cygserver_sem.h"
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#include "cygtls.h"
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/*
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* client_request_sem Constructors
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*/
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client_request_sem::client_request_sem (int semid,
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int semnum,
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int cmd,
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union semun *arg)
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: client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
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{
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_parameters.in.semop = SEMOP_semctl;
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ipc_set_proc_info (_parameters.in.ipcblk);
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_parameters.in.ctlargs.semid = semid;
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_parameters.in.ctlargs.semnum = semnum;
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_parameters.in.ctlargs.cmd = cmd;
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_parameters.in.ctlargs.arg = arg;
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msglen (sizeof (_parameters.in));
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}
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client_request_sem::client_request_sem (key_t key,
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int nsems,
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int semflg)
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: client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
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{
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_parameters.in.semop = SEMOP_semget;
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ipc_set_proc_info (_parameters.in.ipcblk);
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_parameters.in.getargs.key = key;
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_parameters.in.getargs.nsems = nsems;
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_parameters.in.getargs.semflg = semflg;
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msglen (sizeof (_parameters.in));
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}
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client_request_sem::client_request_sem (int semid,
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struct sembuf *sops,
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size_t nsops)
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: client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
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{
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_parameters.in.semop = SEMOP_semop;
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ipc_set_proc_info (_parameters.in.ipcblk);
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_parameters.in.opargs.semid = semid;
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_parameters.in.opargs.sops = sops;
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_parameters.in.opargs.nsops = nsops;
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msglen (sizeof (_parameters.in));
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}
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/*
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* XSI semaphore API. These are exported by the DLL.
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*/
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extern "C" int
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semctl (int semid, int semnum, int cmd, ...)
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{
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union semun arg = {0};
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if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO || cmd == SEM_INFO
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|| cmd == GETALL || cmd == SETALL || cmd == SETVAL)
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{
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va_list ap;
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va_start (ap, cmd);
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arg = va_arg (ap, union semun);
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va_end (ap);
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}
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syscall_printf ("semctl (semid = %d, semnum = %d, cmd = %d, arg = %p)",
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semid, semnum, cmd, arg.buf);
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myfault efault;
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if (efault.faulted (EFAULT))
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return -1;
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client_request_sem request (semid, semnum, cmd, &arg);
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if (request.make_request () == -1 || request.retval () == -1)
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{
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syscall_printf ("-1 [%d] = semctl ()", request.error_code ());
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set_errno (request.error_code ());
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if (request.error_code () == ENOSYS)
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raise (SIGSYS);
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return -1;
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}
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return request.retval ();
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}
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extern "C" int
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semget (key_t key, int nsems, int semflg)
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{
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syscall_printf ("semget (key = %U, nsems = %d, semflg = %y)",
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key, nsems, semflg);
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client_request_sem request (key, nsems, semflg);
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if (request.make_request () == -1 || request.retval () == -1)
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{
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syscall_printf ("-1 [%d] = semget ()", request.error_code ());
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set_errno (request.error_code ());
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if (request.error_code () == ENOSYS)
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raise (SIGSYS);
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return -1;
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}
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return request.retval ();
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}
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extern "C" int
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semop (int semid, struct sembuf *sops, size_t nsops)
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{
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syscall_printf ("semop (semid = %d, sops = %p, nsops = %ld)",
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semid, sops, nsops);
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myfault efault;
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if (efault.faulted (EFAULT))
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return -1;
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client_request_sem request (semid, sops, nsops);
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if (request.make_request () == -1 || request.retval () == -1)
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{
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syscall_printf ("-1 [%d] = semop ()", request.error_code ());
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set_errno (request.error_code ());
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if (request.error_code () == ENOSYS)
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raise (SIGSYS);
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return -1;
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}
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return request.retval ();
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}
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