diff options
Diffstat (limited to 'winsup/cygwin/include/cygwin/sem.h')
| -rw-r--r-- | winsup/cygwin/include/cygwin/sem.h | 75 |
1 files changed, 54 insertions, 21 deletions
diff --git a/winsup/cygwin/include/cygwin/sem.h b/winsup/cygwin/include/cygwin/sem.h index a3ece9f8a..af7a42f36 100644 --- a/winsup/cygwin/include/cygwin/sem.h +++ b/winsup/cygwin/include/cygwin/sem.h @@ -9,8 +9,8 @@ This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ -#ifndef _SYS_SEM_H -#define _SYS_SEM_H +#ifndef _CYGWIN_SEM_H +#define _CYGWIN_SEM_H #include <cygwin/ipc.h> @@ -21,7 +21,7 @@ extern "C" /* Semaphore operation flags: */ -#define SEM_UNDO /* Set up adjust on exit entry. */ +#define SEM_UNDO 010000 /* Set up adjust on exit entry. */ /* Command definitions for the semctl () function: */ @@ -33,8 +33,10 @@ extern "C" #define SETVAL 0x3005 /* Set semval. */ #define SETALL 0x3006 /* Set all cases of semval. */ +#ifdef _KERNEL #define SEM_STAT 0x3010 /* For ipcs(8). */ #define SEM_INFO 0x3011 /* For ipcs(8). */ +#endif /* _KERNEL */ struct semid_ds { @@ -42,7 +44,12 @@ struct semid_ds unsigned short sem_nsems; /* Number of semaphores in set. */ timestruc_t sem_otim; /* Last semop () time. */ timestruc_t sem_ctim; /* Last time changed by semctl (). */ +#ifdef _KERNEL + struct sem *sem_base; /* pointer to first semaphore in set */ + long sem_spare4[1]; +#else long sem_spare4[2]; +#endif /* _KERNEL */ }; #define sem_otime sem_otim.tv_sec @@ -55,35 +62,61 @@ struct sembuf short sem_flg; /* Operation flags. */ }; +#ifdef _KERNEL /* Buffer type for semctl (IPC_INFO, ...) as used by ipcs(8). */ struct seminfo { - unsigned long semmni; /* Maximum number of unique semaphore - sets, system wide. */ - unsigned long semmns; /* Maximum number of semaphores, - system wide. */ - unsigned long semmsl; /* Maximum number of semaphores per - semaphore set. */ - unsigned long semopm; /* Maximum number of operations per - semop call. */ - unsigned long semmnu; /* Maximum number of undo structures, - system wide. */ - unsigned long semume; /* Maximum number of undo entries per - undo structure. */ - unsigned long semvmx; /* Maximum semaphore value. */ - unsigned long semaem; /* Maximum adjust-on-exit value. */ - unsigned long sem_spare[4]; + long semmni; /* Maximum number of unique semaphore + sets, system wide. */ + long semmns; /* Maximum number of semaphores, + system wide. */ + long semmsl; /* Maximum number of semaphores per + semaphore set. */ + long semopm; /* Maximum number of operations per + semop call. */ + long semmnu; /* Maximum number of undo structures, + system wide. */ + long semume; /* Maximum number of undo entries per + undo structure. */ + long semvmx; /* Maximum semaphore value. */ + long semaem; /* Maximum adjust-on-exit value. */ + long semmap; /* # of entries in semaphore map */ + long semusz; /* size in bytes of undo structure */ + long sem_spare[2]; }; /* Buffer type for semctl (SEM_INFO, ...) as used by ipcs(8). */ struct sem_info { - unsigned long sem_ids; /* Number of allocated semaphore sets. */ - unsigned long sem_num; /* Number of allocated semaphores. */ + long sem_ids; /* Number of allocated semaphore sets. */ + long sem_num; /* Number of allocated semaphores. */ }; +/* Permission flags */ +#define SEM_A IPC_W /* alter permission */ +#define SEM_R IPC_R /* read permission */ + +/* Internally used mode bits. */ +#define SEM_ALLOC 01000 /* semaphore is allocated */ + +#endif /* _KERNEL */ + +#ifdef _KERNEL +/* According to SUSv3, "the fourth argument [to semctl()] is optional and + depends upon the operation requested. If required, it is of type + union semun, which the application shall explicitly declare:" */ +union semun { + int val; /* value for SETVAL */ + struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */ + unsigned short *array; /* array for GETALL, SETALL */ +}; +/* Therefore this union is only declared here if building internal code. + _KERNEL must not be defined in exernal applications! Declare union + semun explicitely as required by SUSv3, please. */ +#endif /* _KERNEL */ + int semctl (int semid, int semnum, int cmd, ...); int semget (key_t key, int nsems, int semflg); int semop (int semid, struct sembuf *sops, size_t nsops); @@ -92,4 +125,4 @@ int semop (int semid, struct sembuf *sops, size_t nsops); } #endif -#endif /* _SYS_SEM_H */ +#endif /* _CYGWIN_SEM_H */ |