1 /* sem.cc: XSI IPC interface for Cygwin.
3 Copyright 2003 Red Hat, Inc.
5 This file is part of Cygwin.
7 This software is a copyrighted work licensed under the terms of the
8 Cygwin license. Please consult the file "CYGWIN_LICENSE" for
15 #include <sys/types.h>
22 #include "cygserver_ipc.h"
23 #include "cygserver_sem.h"
26 * client_request_sem Constructors
29 client_request_sem::client_request_sem (int semid,
33 : client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
35 _parameters.in.semop = SEMOP_semctl;
36 ipc_set_proc_info (_parameters.in.ipcblk);
38 _parameters.in.ctlargs.semid = semid;
39 _parameters.in.ctlargs.semnum = semnum;
40 _parameters.in.ctlargs.cmd = cmd;
41 _parameters.in.ctlargs.arg = arg;
43 msglen (sizeof (_parameters.in));
46 client_request_sem::client_request_sem (key_t key,
49 : client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
51 _parameters.in.semop = SEMOP_semget;
52 ipc_set_proc_info (_parameters.in.ipcblk);
54 _parameters.in.getargs.key = key;
55 _parameters.in.getargs.nsems = nsems;
56 _parameters.in.getargs.semflg = semflg;
58 msglen (sizeof (_parameters.in));
61 client_request_sem::client_request_sem (int semid,
64 : client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters))
66 _parameters.in.semop = SEMOP_semop;
67 ipc_set_proc_info (_parameters.in.ipcblk);
69 _parameters.in.opargs.semid = semid;
70 _parameters.in.opargs.sops = sops;
71 _parameters.in.opargs.nsops = nsops;
73 msglen (sizeof (_parameters.in));
75 #endif /* USE_SERVER */
78 * XSI semaphore API. These are exported by the DLL.
82 semctl (int semid, int semnum, int cmd, ...)
85 union semun arg = {0};
86 if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO || cmd == SEM_INFO
87 || cmd == GETALL || cmd == SETALL || cmd == SETVAL)
91 arg = va_arg (ap, union semun);
94 syscall_printf ("semctl (semid = %d, semnum = %d, cmd = %d, arg.val = 0x%x)",
95 semid, semnum, cmd, arg.val);
96 if ((cmd == IPC_STAT || cmd == IPC_SET)
97 && __check_null_invalid_struct_errno (arg.buf, sizeof (struct semid_ds)))
101 /* semid == 0: Request for seminfo struct. */
103 && __check_null_invalid_struct_errno (arg.buf, sizeof (struct seminfo)))
105 /* Otherwise, request semid entries from internal semid_ds array. */
107 if (__check_null_invalid_struct_errno (arg.buf, semid * sizeof (struct semid_ds)))
111 && __check_null_invalid_struct_errno (arg.buf, sizeof (struct sem_info)))
113 client_request_sem request (semid, semnum, cmd, &arg);
114 if (request.make_request () == -1 || request.retval () == -1)
116 syscall_printf ("-1 [%d] = semctl ()", request.error_code ());
117 set_errno (request.error_code ());
118 if (request.error_code () == ENOSYS)
122 return request.retval ();
131 semget (key_t key, int nsems, int semflg)
134 syscall_printf ("semget (key = %U, nsems = %d, semflg = 0x%x)",
136 client_request_sem request (key, nsems, semflg);
137 if (request.make_request () == -1 || request.retval () == -1)
139 syscall_printf ("-1 [%d] = semctl ()", request.error_code ());
140 set_errno (request.error_code ());
141 if (request.error_code () == ENOSYS)
145 return request.retval ();
154 semop (int semid, struct sembuf *sops, size_t nsops)
157 syscall_printf ("semop (semid = %d, sops = %p, nsops = %d)",
159 if (__check_null_invalid_struct_errno (sops, nsops * sizeof (struct sembuf)))
161 client_request_sem request (semid, sops, nsops);
162 if (request.make_request () == -1 || request.retval () == -1)
164 syscall_printf ("-1 [%d] = semctl ()", request.error_code ());
165 set_errno (request.error_code ());
166 if (request.error_code () == ENOSYS)
170 return request.retval ();