The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h

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    1 /* $FreeBSD: stable/12/sys/sys/sem.h 330299 2018-03-02 22:32:53Z brooks $ */
    2 /*      $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $      */
    3 
    4 /*
    5  * SVID compatible sem.h file
    6  *
    7  * Author:  Daniel Boulet
    8  */
    9 
   10 #ifndef _SYS_SEM_H_
   11 #define _SYS_SEM_H_
   12 
   13 #ifdef _WANT_SYSVSEM_INTERNALS
   14 #define _WANT_SYSVIPC_INTERNALS
   15 #endif
   16 #include <sys/ipc.h>
   17 
   18 #ifndef _PID_T_DECLARED
   19 typedef __pid_t         pid_t;
   20 #define _PID_T_DECLARED
   21 #endif
   22 
   23 #ifndef _SIZE_T_DECLARED
   24 typedef __size_t        size_t;
   25 #define _SIZE_T_DECLARED
   26 #endif
   27 
   28 #ifndef _TIME_T_DECLARED
   29 typedef __time_t        time_t;
   30 #define _TIME_T_DECLARED
   31 #endif
   32 
   33 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
   34     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
   35 struct semid_ds_old {
   36         struct ipc_perm_old sem_perm;   /* operation permission struct */
   37         struct sem      *__sem_base;    /* pointer to first semaphore in set */
   38         unsigned short  sem_nsems;      /* number of sems in set */
   39         time_t          sem_otime;      /* last operation time */
   40         long            sem_pad1;       /* SVABI/386 says I need this here */
   41         time_t          sem_ctime;      /* last change time */
   42                                         /* Times measured in secs since */
   43                                         /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
   44         long            sem_pad2;       /* SVABI/386 says I need this here */
   45         long            sem_pad3[4];    /* SVABI/386 says I need this here */
   46 };
   47 #endif
   48 
   49 struct semid_ds {
   50         struct ipc_perm sem_perm;       /* operation permission struct */
   51         struct sem      *__sem_base;    /* pointer to first semaphore in set */
   52         unsigned short  sem_nsems;      /* number of sems in set */
   53         time_t          sem_otime;      /* last operation time */
   54         time_t          sem_ctime;      /* last change time */
   55                                         /* Times measured in secs since */
   56                                         /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
   57 };
   58 
   59 /*
   60  * semop's sops parameter structure
   61  */
   62 struct sembuf {
   63         unsigned short  sem_num;        /* semaphore # */
   64         short           sem_op;         /* semaphore operation */
   65         short           sem_flg;        /* operation flags */
   66 };
   67 #define SEM_UNDO        010000
   68 
   69 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
   70     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
   71     defined(_WANT_SEMUN_OLD)
   72 union semun_old {
   73         int             val;            /* value for SETVAL */
   74         struct          semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */
   75         unsigned short  *array;         /* array for GETALL & SETALL */
   76 };
   77 #endif
   78 
   79 #if defined(_KERNEL) || defined(_WANT_SEMUN)
   80 /*
   81  * semctl's arg parameter structure
   82  */
   83 union semun {
   84         int             val;            /* value for SETVAL */
   85         struct          semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
   86         unsigned short  *array;         /* array for GETALL & SETALL */
   87 };
   88 #endif
   89 
   90 /*
   91  * commands for semctl
   92  */
   93 #define GETNCNT 3       /* Return the value of semncnt {READ} */
   94 #define GETPID  4       /* Return the value of sempid {READ} */
   95 #define GETVAL  5       /* Return the value of semval {READ} */
   96 #define GETALL  6       /* Return semvals into arg.array {READ} */
   97 #define GETZCNT 7       /* Return the value of semzcnt {READ} */
   98 #define SETVAL  8       /* Set the value of semval to arg.val {ALTER} */
   99 #define SETALL  9       /* Set semvals from arg.array {ALTER} */
  100 #define SEM_STAT 10     /* Like IPC_STAT but treats semid as sema-index */
  101 #define SEM_INFO 11     /* Like IPC_INFO but treats semid as sema-index */
  102 
  103 /*
  104  * Permissions
  105  */
  106 #define SEM_A           IPC_W   /* alter permission */
  107 #define SEM_R           IPC_R   /* read permission */
  108 
  109 #if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS)
  110 /*
  111  * semaphore info struct
  112  */
  113 struct seminfo {
  114         int     semmni;         /* # of semaphore identifiers */
  115         int     semmns;         /* # of semaphores in system */
  116         int     semmnu;         /* # of undo structures in system */
  117         int     semmsl;         /* max # of semaphores per id */
  118         int     semopm;         /* max # of operations per semop call */
  119         int     semume;         /* max # of undo entries per process */
  120         int     semusz;         /* size in bytes of undo structure */
  121         int     semvmx;         /* semaphore maximum value */
  122         int     semaem;         /* adjust on exit max value */
  123 };
  124 
  125 /*
  126  * Kernel wrapper for the user-level structure
  127  */
  128 struct semid_kernel {
  129         struct  semid_ds u;
  130         struct  label *label;   /* MAC framework label */
  131         struct  ucred *cred;    /* creator's credentials */
  132 };
  133 
  134 /* internal "mode" bits */
  135 #define SEM_ALLOC       01000   /* semaphore is allocated */
  136 #define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
  137 #endif
  138 
  139 #ifdef _KERNEL
  140 extern struct seminfo   seminfo;
  141 /*
  142  * Process sem_undo vectors at proc exit.
  143  */
  144 void    semexit(struct proc *p);
  145 
  146 #else /* !_KERNEL */
  147 
  148 __BEGIN_DECLS
  149 #if __BSD_VISIBLE
  150 int semsys(int, ...);
  151 #endif
  152 int semctl(int, int, int, ...);
  153 int semget(key_t, int, int);
  154 int semop(int, struct sembuf *, size_t);
  155 __END_DECLS
  156 
  157 #endif /* !_KERNEL */
  158 
  159 #endif /* !_SYS_SEM_H_ */

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