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Edit File : sem.h \| Size : 2.97 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _LINUX_SEM_H #define _LINUX_SEM_H #include <linux/ipc.h> / semop flags / #define SEM_UNDO 0x1000 / undo the operation on exit / / semctl Command Definitions. / #define GETPID 11 / get sempid / #define GETVAL 12 / get semval / #define GETALL 13 / get all semval's / #define GETNCNT 14 / get semncnt / #define GETZCNT 15 / get semzcnt / #define SETVAL 16 / set semval / #define SETALL 17 / set all semval's / / ipcs ctl cmds / #define SEM_STAT 18 #define SEM_INFO 19 #define SEM_STAT_ANY 20 / Obsolete, used only for backwards compatibility and libc5 compiles / struct semid_ds { struct ipc_perm sem_perm; / permissions .. see ipc.h / __kernel_time_t sem_otime; / last semop time / __kernel_time_t sem_ctime; / create/last semctl() time / struct sem sem_base; /* ptr to first semaphore in array / struct sem_queue sem_pending; /* pending operations to be processed / struct sem_queue sem_pending_last; / last pending operation / struct sem_undo undo; /* undo requests on this array / unsigned short sem_nsems; / no. of semaphores in array / }; / Include the definition of semid64_ds / #include <asm/sembuf.h> / semop system calls takes an array of these. / struct sembuf { unsigned short sem_num; / semaphore index in array / short sem_op; / semaphore operation / short sem_flg; / operation flags / }; / arg for semctl system calls. / union semun { int val; / value for SETVAL / struct semid_ds buf; /* buffer for IPC_STAT & IPC_SET / unsigned short array; /* array for GETALL & SETALL / struct seminfo __buf; /* buffer for IPC_INFO / void __pad; }; struct seminfo { int semmap; int semmni; int semmns; int semmnu; int semmsl; int semopm; int semume; int semusz; int semvmx; int semaem; }; /* * SEMMNI, SEMMSL and SEMMNS are default values which can be * modified by sysctl. * The values has been chosen to be larger than necessary for any * known configuration. * * SEMOPM should not be increased beyond 1000, otherwise there is the * risk that semop()/semtimedop() fails due to kernel memory fragmentation when * allocating the sop array. / #define SEMMNI 32000 / <= IPCMNI max # of semaphore identifiers / #define SEMMSL 32000 / <= INT_MAX max num of semaphores per id / #define SEMMNS (SEMMNISEMMSL) /* <= INT_MAX max # of semaphores in system / #define SEMOPM 500 / <= 1 000 max num of ops per semop call / #define SEMVMX 32767 / <= 32767 semaphore maximum value / #define SEMAEM SEMVMX / adjust on exit max value / / unused / #define SEMUME SEMOPM / max num of undo entries per process / #define SEMMNU SEMMNS / num of undo structures system wide / #define SEMMAP SEMMNS / # of entries in semaphore map / #define SEMUSZ 20 / sizeof struct sem_undo / #endif / _LINUX_SEM_H */ Back

Edit File : sem.h | Size : 2.97 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_SEM_H
#define _LINUX_SEM_H

#include <linux/ipc.h>

/* semop flags */
#define SEM_UNDO        0x1000  /* undo the operation on exit */

/* semctl Command Definitions. */
#define GETPID  11       /* get sempid */
#define GETVAL  12       /* get semval */
#define GETALL  13       /* get all semval's */
#define GETNCNT 14       /* get semncnt */
#define GETZCNT 15       /* get semzcnt */
#define SETVAL  16       /* set semval */
#define SETALL  17       /* set all semval's */

/* ipcs ctl cmds */
#define SEM_STAT 18
#define SEM_INFO 19
#define SEM_STAT_ANY 20

/* Obsolete, used only for backwards compatibility and libc5 compiles */
struct semid_ds {
	struct ipc_perm	sem_perm;		/* permissions .. see ipc.h */
	__kernel_time_t	sem_otime;		/* last semop time */
	__kernel_time_t	sem_ctime;		/* create/last semctl() time */
	struct sem	*sem_base;		/* ptr to first semaphore in array */
	struct sem_queue *sem_pending;		/* pending operations to be processed */
	struct sem_queue **sem_pending_last;	/* last pending operation */
	struct sem_undo	*undo;			/* undo requests on this array */
	unsigned short	sem_nsems;		/* no. of semaphores in array */
};

/* Include the definition of semid64_ds */
#include <asm/sembuf.h>

/* semop system calls takes an array of these. */
struct sembuf {
	unsigned short  sem_num;	/* semaphore index in array */
	short		sem_op;		/* semaphore operation */
	short		sem_flg;	/* operation flags */
};

/* arg for semctl system calls. */
union semun {
	int val;			/* value for SETVAL */
	struct semid_ds *buf;	/* buffer for IPC_STAT & IPC_SET */
	unsigned short *array;	/* array for GETALL & SETALL */
	struct seminfo *__buf;	/* buffer for IPC_INFO */
	void *__pad;
};

struct  seminfo {
	int semmap;
	int semmni;
	int semmns;
	int semmnu;
	int semmsl;
	int semopm;
	int semume;
	int semusz;
	int semvmx;
	int semaem;
};

/*
 * SEMMNI, SEMMSL and SEMMNS are default values which can be
 * modified by sysctl.
 * The values has been chosen to be larger than necessary for any
 * known configuration.
 *
 * SEMOPM should not be increased beyond 1000, otherwise there is the
 * risk that semop()/semtimedop() fails due to kernel memory fragmentation when
 * allocating the sop array.
 */

#define SEMMNI  32000           /* <= IPCMNI  max # of semaphore identifiers */
#define SEMMSL  32000           /* <= INT_MAX max num of semaphores per id */
#define SEMMNS  (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */
#define SEMOPM  500	        /* <= 1 000 max num of ops per semop call */
#define SEMVMX  32767           /* <= 32767 semaphore maximum value */
#define SEMAEM  SEMVMX          /* adjust on exit max value */

/* unused */
#define SEMUME  SEMOPM          /* max num of undo entries per process */
#define SEMMNU  SEMMNS          /* num of undo structures system wide */
#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
#define SEMUSZ  20		/* sizeof struct sem_undo */

#endif /* _LINUX_SEM_H */

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