1 #define __USE_MISC 2 #define _SYSTEM 1 3 #define _MINIX_SYSTEM 1 4 5 #include <sys/cdefs.h> 6 #include <lib.h> 7 #include "namespace.h" 8 9 #include <lib.h> 10 #include <minix/rs.h> 11 12 #include <sys/types.h> 13 #include <sys/ipc.h> 14 #include <sys/sem.h> 15 #include <stdlib.h> 16 #include <stdarg.h> 17 #include <errno.h> 18 #include <string.h> 19 20 static int get_ipc_endpt(endpoint_t *pt) 21 { 22 return minix_rs_lookup("ipc", pt); 23 } 24 25 /* Get semaphore. */ 26 int semget(key_t key, int nsems, int semflag) 27 { 28 message m; 29 endpoint_t ipc_pt; 30 int r; 31 32 if (get_ipc_endpt(&ipc_pt) != OK) { 33 errno = ENOSYS; 34 return -1; 35 } 36 37 memset(&m, 0, sizeof(m)); 38 m.m_lc_ipc_semget.key = key; 39 m.m_lc_ipc_semget.nr = nsems; 40 m.m_lc_ipc_semget.flag = semflag; 41 42 r = _syscall(ipc_pt, IPC_SEMGET, &m); 43 if (r != OK) 44 return r; 45 46 return m.m_lc_ipc_semget.retid; 47 } 48 49 /* Semaphore control operation. */ 50 int semctl(int semid, int semnum, int cmd, ...) 51 { 52 message m; 53 endpoint_t ipc_pt; 54 va_list ap; 55 int r; 56 57 if (get_ipc_endpt(&ipc_pt) != OK) { 58 errno = ENOSYS; 59 return -1; 60 } 61 62 memset(&m, 0, sizeof(m)); 63 m.m_lc_ipc_semctl.id = semid; 64 m.m_lc_ipc_semctl.num = semnum; 65 m.m_lc_ipc_semctl.cmd = cmd; 66 va_start(ap, cmd); 67 if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO || 68 cmd == SEM_INFO || cmd == SEM_STAT || cmd == GETALL || 69 cmd == SETALL || cmd == SETVAL) 70 m.m_lc_ipc_semctl.opt = (long) va_arg(ap, long); 71 va_end(ap); 72 73 r = _syscall(ipc_pt, IPC_SEMCTL, &m); 74 if ((r != -1) && (cmd == GETNCNT || cmd == GETZCNT || cmd == GETPID || 75 cmd == GETVAL || cmd == IPC_INFO || cmd == SEM_INFO || 76 cmd == SEM_STAT)) 77 return m.m_lc_ipc_semctl.ret; 78 return r; 79 } 80 81 /* Operate on semaphore. */ 82 int semop(int semid, struct sembuf *sops, size_t nsops) 83 { 84 message m; 85 endpoint_t ipc_pt; 86 87 if (get_ipc_endpt(&ipc_pt) != OK) { 88 errno = ENOSYS; 89 return -1; 90 } 91 92 memset(&m, 0, sizeof(m)); 93 m.m_lc_ipc_semop.id = semid; 94 m.m_lc_ipc_semop.ops = sops; 95 m.m_lc_ipc_semop.size = nsops; 96 97 return _syscall(ipc_pt, IPC_SEMOP, &m); 98 } 99 100