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1 | /* sem.cc: XSI IPC interface for Cygwin. | |
2 | ||
3 | This file is part of Cygwin. | |
4 | ||
5 | This software is a copyrighted work licensed under the terms of the | |
6 | Cygwin license. Please consult the file "CYGWIN_LICENSE" for | |
7 | details. */ | |
8 | ||
9 | #include "winsup.h" | |
10 | #include <unistd.h> | |
11 | ||
12 | #include "sigproc.h" | |
13 | ||
14 | #include "cygserver_sem.h" | |
15 | #include "cygtls.h" | |
16 | ||
17 | /* | |
18 | * client_request_sem Constructors | |
19 | */ | |
20 | ||
21 | client_request_sem::client_request_sem (int semid, | |
22 | int semnum, | |
23 | int cmd, | |
24 | union semun *arg) | |
25 | : client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters)) | |
26 | { | |
27 | _parameters.in.semop = SEMOP_semctl; | |
28 | ipc_set_proc_info (_parameters.in.ipcblk); | |
29 | ||
30 | _parameters.in.ctlargs.semid = semid; | |
31 | _parameters.in.ctlargs.semnum = semnum; | |
32 | _parameters.in.ctlargs.cmd = cmd; | |
33 | _parameters.in.ctlargs.arg = arg; | |
34 | ||
35 | msglen (sizeof (_parameters.in)); | |
36 | } | |
37 | ||
38 | client_request_sem::client_request_sem (key_t key, | |
39 | int nsems, | |
40 | int semflg) | |
41 | : client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters)) | |
42 | { | |
43 | _parameters.in.semop = SEMOP_semget; | |
44 | ipc_set_proc_info (_parameters.in.ipcblk); | |
45 | ||
46 | _parameters.in.getargs.key = key; | |
47 | _parameters.in.getargs.nsems = nsems; | |
48 | _parameters.in.getargs.semflg = semflg; | |
49 | ||
50 | msglen (sizeof (_parameters.in)); | |
51 | } | |
52 | ||
53 | client_request_sem::client_request_sem (int semid, | |
54 | struct sembuf *sops, | |
55 | size_t nsops) | |
56 | : client_request (CYGSERVER_REQUEST_SEM, &_parameters, sizeof (_parameters)) | |
57 | { | |
58 | _parameters.in.semop = SEMOP_semop; | |
59 | ipc_set_proc_info (_parameters.in.ipcblk); | |
60 | ||
61 | _parameters.in.opargs.semid = semid; | |
62 | _parameters.in.opargs.sops = sops; | |
63 | _parameters.in.opargs.nsops = nsops; | |
64 | ||
65 | msglen (sizeof (_parameters.in)); | |
66 | } | |
67 | ||
68 | /* | |
69 | * XSI semaphore API. These are exported by the DLL. | |
70 | */ | |
71 | ||
72 | extern "C" int | |
73 | semctl (int semid, int semnum, int cmd, ...) | |
74 | { | |
75 | union semun arg = {0}; | |
76 | if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO || cmd == SEM_INFO | |
77 | || cmd == GETALL || cmd == SETALL || cmd == SETVAL) | |
78 | { | |
79 | va_list ap; | |
80 | va_start (ap, cmd); | |
81 | arg = va_arg (ap, union semun); | |
82 | va_end (ap); | |
83 | } | |
84 | syscall_printf ("semctl (semid = %d, semnum = %d, cmd = %d, arg = %p)", | |
85 | semid, semnum, cmd, arg.buf); | |
86 | __try | |
87 | { | |
88 | client_request_sem request (semid, semnum, cmd, &arg); | |
89 | if (request.make_request () == -1 || request.retval () == -1) | |
90 | { | |
91 | syscall_printf ("-1 [%d] = semctl ()", request.error_code ()); | |
92 | set_errno (request.error_code ()); | |
93 | __leave; | |
94 | } | |
95 | return request.retval (); | |
96 | } | |
97 | __except (EFAULT) {} | |
98 | __endtry | |
99 | return -1; | |
100 | } | |
101 | ||
102 | extern "C" int | |
103 | semget (key_t key, int nsems, int semflg) | |
104 | { | |
105 | syscall_printf ("semget (key = %U, nsems = %d, semflg = %y)", | |
106 | key, nsems, semflg); | |
107 | client_request_sem request (key, nsems, semflg); | |
108 | if (request.make_request () == -1 || request.retval () == -1) | |
109 | { | |
110 | syscall_printf ("-1 [%d] = semget ()", request.error_code ()); | |
111 | set_errno (request.error_code ()); | |
112 | return -1; | |
113 | } | |
114 | return request.retval (); | |
115 | } | |
116 | ||
117 | extern "C" int | |
118 | semop (int semid, struct sembuf *sops, size_t nsops) | |
119 | { | |
120 | syscall_printf ("semop (semid = %d, sops = %p, nsops = %ld)", | |
121 | semid, sops, nsops); | |
122 | __try | |
123 | { | |
124 | client_request_sem request (semid, sops, nsops); | |
125 | if (request.make_request () == -1 || request.retval () == -1) | |
126 | { | |
127 | syscall_printf ("-1 [%d] = semop ()", request.error_code ()); | |
128 | set_errno (request.error_code ()); | |
129 | __leave; | |
130 | } | |
131 | return request.retval (); | |
132 | } | |
133 | __except (EFAULT) {} | |
134 | __endtry | |
135 | return -1; | |
136 | } |