1 sem.h |
1 /* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson Exp $ */ |
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2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ |
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3 |
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4 /* |
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5 *© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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6 *© Portions copyright (c) 2006 Symbian Software Ltd. All rights reserved. |
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7 * SVID compatible sem.h file |
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8 * |
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9 * Author: Daniel Boulet |
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10 */ |
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11 |
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12 #ifndef _SYS_SEM_H_ |
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13 #define _SYS_SEM_H_ |
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14 |
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15 #include <sys/ipc.h> |
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16 |
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17 |
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18 struct sem { |
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19 u_short semval; /* semaphore value */ |
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20 pid_t sempid; /* process ID of last operation */ |
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21 u_short semncnt; /* number of processes waiting for semval |
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22 to become greater than current value */ |
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23 u_short semzcnt; /* number of processes waiting for semval |
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24 to become 0 */ |
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25 }; |
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26 |
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27 struct semid_ds { |
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28 struct ipc_perm sem_perm; /* operation permission struct */ |
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29 struct sem *sem_base; /* pointer to first semaphore in set */ |
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30 unsigned short sem_nsems; /* number of sems in set */ |
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31 time_t sem_otime; /* last operation time */ |
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32 long sem_pad1; /* SVABI/386 says I need this here */ |
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33 time_t sem_ctime; /* last change time */ |
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34 /* Times measured in secs since */ |
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35 /* 00:00:00 GMT, Jan. 1, 1970 */ |
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36 long sem_pad2; /* SVABI/386 says I need this here */ |
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37 long sem_pad3[4]; /* SVABI/386 says I need this here */ |
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38 }; |
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39 |
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40 /* |
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41 * semop's sops parameter structure |
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42 */ |
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43 struct sembuf { |
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44 unsigned short sem_num; /* semaphore # */ |
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45 short sem_op; /* semaphore operation */ |
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46 short sem_flg; /* operation flags */ |
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47 }; |
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48 #define SEM_UNDO 010000 |
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49 |
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50 /* |
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51 * semctl's arg parameter structure |
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52 */ |
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53 union semun { |
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54 int val; /* value for SETVAL */ |
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55 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ |
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56 unsigned short *array; /* array for GETALL & SETALL */ |
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57 }; |
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58 |
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59 /* |
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60 * commands for semctl |
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61 */ |
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62 #define GETNCNT 3 /* Return the value of semncnt {READ} */ |
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63 #define GETPID 4 /* Return the value of sempid {READ} */ |
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64 #define GETVAL 5 /* Return the value of semval {READ} */ |
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65 #define GETALL 6 /* Return semvals into arg.array {READ} */ |
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66 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ |
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67 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ |
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68 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ |
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69 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ |
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70 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ |
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71 |
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72 /* |
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73 * Permissions |
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74 */ |
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75 #define SEM_A IPC_W /* alter permission */ |
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76 #define SEM_R IPC_R /* read permission */ |
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77 |
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78 #ifdef _KERNEL |
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79 |
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80 /* |
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81 * semaphore info struct |
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82 */ |
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83 struct seminfo { |
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84 int semmap, /* # of entries in semaphore map */ |
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85 semmni, /* # of semaphore identifiers */ |
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86 semmns, /* # of semaphores in system */ |
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87 semmnu, /* # of undo structures in system */ |
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88 semmsl, /* max # of semaphores per id */ |
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89 semopm, /* max # of operations per semop call */ |
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90 semume, /* max # of undo entries per process */ |
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91 semusz, /* size in bytes of undo structure */ |
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92 semvmx, /* semaphore maximum value */ |
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93 semaem; /* adjust on exit max value */ |
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94 }; |
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95 extern struct seminfo seminfo; |
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96 |
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97 /* |
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98 * Kernel wrapper for the user-level structure |
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99 */ |
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100 struct semid_kernel { |
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101 struct semid_ds u; |
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102 struct label *label; /* MAC framework label */ |
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103 }; |
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104 |
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105 /* internal "mode" bits */ |
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106 #define SEM_ALLOC 01000 /* semaphore is allocated */ |
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107 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ |
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108 |
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109 /* |
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110 * Process sem_undo vectors at proc exit. |
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111 */ |
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112 void semexit(struct proc *p); |
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113 #endif /* _KERNEL */ |
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114 |
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115 #ifndef _KERNEL |
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116 #include <sys/cdefs.h> |
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117 #include <sys/_types.h> |
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118 |
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119 #ifndef _SIZE_T_DECLARED |
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120 typedef __size_t size_t; |
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121 #define _SIZE_T_DECLARED |
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122 #endif |
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123 |
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124 #ifndef _PID_T_DECLARED |
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125 typedef __pid_t pid_t; |
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126 #define _PID_T_DECLARED |
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127 #endif |
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128 |
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129 // FUNCTION PROTOTYPES |
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130 |
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131 |
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132 // FORWARD DECLARATIONS |
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133 |
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134 |
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135 // CLASS/STRUCT/FUNCTION DECLARATION |
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136 |
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137 __BEGIN_DECLS |
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138 |
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139 /* |
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140 * Get semaphore identifier using the IPC key generated by ftok. |
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141 */ |
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142 |
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143 IMPORT_C int semget(key_t key, int nsems, int semflg); |
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144 |
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145 |
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146 /* |
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147 * Perform atomically a user-defined array of semaphore operations on the set of |
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148 * semaphores associated with the semaphore identifier specified by the argument semid. |
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149 */ |
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150 |
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151 IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops); |
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152 |
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153 |
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154 /* |
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155 * Provides a variety of semaphore control operations as specified by cmd. |
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156 */ |
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157 IMPORT_C int semctl(int semid, int semnum, int cmd, ...); |
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158 |
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159 |
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160 __END_DECLS |
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161 #endif // #ifndef _KERNEL |
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162 |
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163 #endif // _SYS_SEM_H_ |
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164 |
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165 // End of File |